SpaceTEC Certified Aerospace Technician (CAT) Core — Questions and Answers

Question 1: Which of the following activities is NOT typically part of an aerospace technician's responsibilities?

Installing and upgrading avionics systems
Conducting diagnostic tests on electrical systems
Coordinating flight schedules for airlines (Correct answer)
Performing structural repairs on aircraft components

Correct answer: Coordinating flight schedules for airlines

Coordinating flight schedules is typically the responsibility of airline operations staff or scheduling coordinators, not aerospace technicians. Aerospace technicians focus on the technical aspects of maintenance, repairs, diagnostics, and installations rather than scheduling.

Question 2: What is the correct application sequence for dye penetrant inspection?

Clean surface → Apply penetrant → Dwell time → Remove excess → Apply developer → Inspect (Correct answer)
Apply developer → Apply penetrant → Inspect → Clean surface
Clean → Apply developer → Apply penetrant → Inspect
Apply penetrant → Clean surface → Apply developer → Inspect

Correct answer: Clean surface → Apply penetrant → Dwell time → Remove excess → Apply developer → Inspect

Proper DPI sequence is: clean and dry the surface, apply penetrant, allow dwell time for penetration, remove excess penetrant, apply developer to draw out penetrant, then inspect under appropriate lighting.

Question 3: What does the acronym FOD stand for in aerospace safety?

Foreign Object Debris/Damage (Correct answer)
Fuel Oil Deposit
Flight Operations Directive
Fuselage Overhaul Deficiency

Correct answer: Foreign Object Debris/Damage

FOD (Foreign Object Debris/Damage) refers to any object or material that could damage aircraft or injure personnel, making FOD prevention a critical safety practice.

Question 4: What certification does the FAA issue to an individual who passes all knowledge, experience, and skill requirements for aircraft maintenance?

Aviation Mechanic Certificate with Airframe and/or Powerplant ratings (A&P) (Correct answer)
Aviation Maintenance Technician Certificate (AMTC)
Aerospace Technician License (ATL)
Certified Aircraft Maintenance Engineer (CAME)

Correct answer: Aviation Mechanic Certificate with Airframe and/or Powerplant ratings (A&P)

The FAA issues an Aviation Mechanic Certificate with Airframe (A) and/or Powerplant (P) ratings upon passing written, oral, and practical tests as prescribed in 14 CFR Part 65.

Question 5: What is the primary purpose of a Safety Management System (SMS) in aerospace organizations?

To proactively identify and mitigate safety risks before accidents occur (Correct answer)
To investigate accidents after they happen
To certify new aircraft types
To train pilots on emergency procedures

Correct answer: To proactively identify and mitigate safety risks before accidents occur

An SMS provides a systematic, proactive framework for managing safety risks by identifying hazards and implementing controls before accidents or incidents occur.

Question 6: What is a Required Inspection Item (RII) in airline maintenance operations?

A maintenance task identified as so critical to safety that it must be inspected by a second qualified inspector before return to service (Correct answer)
A daily preflight inspection item
An item listed on the MEL that requires inspection before each flight
A component required to be replaced at each maintenance visit

Correct answer: A maintenance task identified as so critical to safety that it must be inspected by a second qualified inspector before return to service

RIIs are critical maintenance tasks (such as flight control rigging) that require inspection by a second certified person before the aircraft can be returned to service.

Question 7: What does Fly-by-Wire (FBW) technology replace in conventional aircraft flight control systems?

Hydraulic fluid with compressed air actuators
Analog cockpit instruments with digital displays
Mechanical cables and linkages with electronic signal transmission to actuators (Correct answer)
Autopilot systems with manual control inputs

Correct answer: Mechanical cables and linkages with electronic signal transmission to actuators

Fly-by-Wire replaces traditional mechanical push-pull rods and cables with electronic control signals transmitted by wire to electrically-commanded hydraulic or electric actuators.

Question 8: What is the purpose of an aircraft Ground Fault Interrupter (GFI) circuit?

To control navigation radio frequencies
To regulate generator output voltage
To monitor engine ignition systems
To detect and interrupt unintended leakage currents flowing to the airframe (Correct answer)

Correct answer: To detect and interrupt unintended leakage currents flowing to the airframe

A GFI detects small leakage currents flowing to the airframe structure and interrupts the circuit to prevent shock hazards or fire.

Question 9: What is the purpose of a tachometer in aircraft engine maintenance testing?

To balance propeller blade angles
To check oil pressure at various power settings
To measure engine rotational speed (RPM) to verify correct operating range and governor response (Correct answer)
To measure exhaust gas temperature during run-up

Correct answer: To measure engine rotational speed (RPM) to verify correct operating range and governor response

A tachometer measures engine RPM, allowing technicians to verify the engine is operating within specified speed ranges and that governor or fuel control units are functioning correctly during ground runs.

Question 10: What is the purpose of a borescope in aircraft maintenance?

To pressure-test hydraulic lines
To align engine mounts during installation
To visually inspect internal engine components and confined spaces without disassembly (Correct answer)
To measure fuel flow rates in engine injectors

Correct answer: To visually inspect internal engine components and confined spaces without disassembly

A borescope is a flexible or rigid optical instrument that allows technicians to visually inspect the interior of engines, fuselage cavities, and other confined spaces without disassembly.

Question 11: How does the job outlook for aerospace technicians compare with other technical fields?

It is growing due to increased demand for air travel, aerospace innovation, and advanced technologies. (Correct answer)
It is shrinking because fewer people are entering the aerospace industry.
It is declining due to automation.
It is stable, with no significant changes expected in the future.

Correct answer: It is growing due to increased demand for air travel, aerospace innovation, and advanced technologies.

The job outlook for aerospace technicians is favorable, with growth driven by rising demand in areas like air travel, drone technology, and space exploration. This ongoing innovation creates more opportunities for skilled technicians.

Question 12: When selecting a drill bit for drilling aluminum aircraft skin, what type of bit geometry is preferred?

A bit with a 118° or 135° point angle specifically designed for aluminum to produce clean holes without tearing (Correct answer)
A brad-point bit for precise positioning
A masonry bit for hard surfaces
A standard wood-boring bit for its sharpness

Correct answer: A bit with a 118° or 135° point angle specifically designed for aluminum to produce clean holes without tearing

Drill bits designed for aluminum have specific point angles and flute geometry to cut cleanly without work-hardening or tearing the soft metal, preventing stress concentrations at the hole edge.

Question 13: What action must be taken when a technician discovers a defect beyond the scope of authorized work during an inspection?

Immediately attempt to repair the defect without authorization
Stop work and notify the appropriate supervisory or certifying authority (Correct answer)
Ground the aircraft and wait for the pilot's instructions
Continue the original task and note the defect in a personal log

Correct answer: Stop work and notify the appropriate supervisory or certifying authority

When a technician discovers a defect outside their authorized scope, they must stop and notify the supervising or certifying authority to ensure proper disposition.

Question 14: What is the difference between a 'Major Alteration' and a 'Minor Alteration' in aircraft maintenance?

A major alteration might appreciably affect airworthiness and requires FAA approval; a minor alteration has only a negligible effect (Correct answer)
A major alteration changes engine power; a minor alteration changes exterior paint
A major alteration costs more than $5,000; a minor alteration costs less
A major alteration requires an IA; a minor alteration requires only an A&P

Correct answer: A major alteration might appreciably affect airworthiness and requires FAA approval; a minor alteration has only a negligible effect

Major alterations might appreciably affect structural strength, flight characteristics, or airworthiness and require FAA approval (Form 337); minor alterations have negligible effect and can be approved by an A&P mechanic.

Question 15: When is Magnetic Particle Inspection (MPI) preferred over dye penetrant for detecting defects?

When inspecting ferromagnetic materials for both surface and near-surface defects (Correct answer)
When checking composite panels for delamination
When testing titanium fasteners for surface cracks only
When inspecting aluminum components for corrosion

Correct answer: When inspecting ferromagnetic materials for both surface and near-surface defects

MPI is preferred for ferromagnetic materials (iron, steel, nickel alloys) because it detects both surface and near-surface discontinuities using magnetic fields and iron particles.

Question 16: What purpose does a go/no-go gauge serve in aerospace parts inspection?

To measure exact part dimensions with high precision
To verify that a part dimension falls within the acceptable tolerance range without providing a specific measurement (Correct answer)
To test the tensile strength of threaded fasteners
To check surface finish roughness

Correct answer: To verify that a part dimension falls within the acceptable tolerance range without providing a specific measurement

A go/no-go gauge confirms whether a dimension is within tolerance: the 'go' end should fit (minimum acceptable size), and the 'no-go' end should not fit (maximum acceptable size).

Question 17: In aircraft landing gear systems, what is the function of an oleo strut?

To steer the nosewheel
To lock the gear in the up position
To provide brake pressure
To absorb landing impact energy using compressed oil and gas (Correct answer)

Correct answer: To absorb landing impact energy using compressed oil and gas

An oleo strut is a pneumatic-hydraulic shock absorber that uses compressed oil and nitrogen gas to absorb and dissipate landing impact energy.

Question 18: Which of the following education pathways is commonly pursued by someone aiming to become a certified aerospace technician?

Bachelor’s degree in History
Diploma in Culinary Arts
Bachelor's degree in Business Administration
Associate’s degree in Aerospace Technology or Avionics (Correct answer)

Correct answer: Associate’s degree in Aerospace Technology or Avionics

An associate’s degree in aerospace technology, avionics, or a related field provides the foundational knowledge and hands-on experience needed to start a career as an aerospace technician. Higher-level degrees in unrelated fields or diplomas in non-technical fields do not provide the necessary technical skills for this career.

Question 19: What is the primary purpose of electrical bonding between aircraft structural components?

Insulate electrical cables from the metallic airframe structure
Increase resistance between dissimilar metals to prevent galvanic corrosion
Establish low-resistance electrical paths to equalize potential and provide a common ground (Correct answer)
Prevent voltage spikes from entering sensitive avionics equipment

Correct answer: Establish low-resistance electrical paths to equalize potential and provide a common ground

Bonding creates low-resistance connections between structural members to prevent static charge buildup, reduce electromagnetic interference, and establish a reliable ground reference.

Question 20: What does an Approved Repair Station (ARS) certificate under 14 CFR Part 145 authorize?

Performing only non-destructive testing
Performing maintenance, preventive maintenance, and alterations on certificated aircraft and components within the station's rated capability (Correct answer)
Training and issuing A&P certificates to mechanics
Manufacturing new aircraft parts for sale

Correct answer: Performing maintenance, preventive maintenance, and alterations on certificated aircraft and components within the station's rated capability

A Part 145 Approved Repair Station certificate authorizes the facility to perform maintenance and alterations on aircraft, engines, propellers, or appliances as specified in its Operations Specifications.

Question 21: What is the primary goal of a Quality Management System (QMS) in an FAA-approved repair station?

To reduce the cost of spare parts procurement
To schedule technician shifts efficiently
To ensure all maintenance work consistently meets regulatory and safety standards through documented processes and controls (Correct answer)
To maximize the number of aircraft processed per day

Correct answer: To ensure all maintenance work consistently meets regulatory and safety standards through documented processes and controls

A QMS provides systematic, documented processes to ensure maintenance consistently meets FAA regulations and manufacturer standards, preventing quality escapes that could compromise airworthiness.

Question 22: What is the correct first step when discovering a potential safety of flight issue during aircraft maintenance?

Attempt a quick fix to avoid grounding the aircraft
Ground the aircraft and document the finding immediately (Correct answer)
Notify the aircraft owner before documenting
Complete the scheduled maintenance then address the issue

Correct answer: Ground the aircraft and document the finding immediately

When a safety of flight issue is discovered, the aircraft must be grounded immediately and the finding documented to ensure no unsafe aircraft is returned to service.

Question 23: What is the primary material used in modern commercial aircraft fuselage construction due to its high strength-to-weight ratio?

Steel and titanium
Aluminum alloy and carbon fiber reinforced polymer (CFRP) (Correct answer)
Magnesium alloy
Fiberglass only

Correct answer: Aluminum alloy and carbon fiber reinforced polymer (CFRP)

Modern commercial aircraft use aluminum alloys and increasingly carbon fiber reinforced polymers (composites) because they offer excellent strength-to-weight ratios critical for fuel efficiency.

Question 24: Which of the following skills is essential for diagnosing issues in aerospace systems?

Basic cooking skills
Graphic design knowledge
Problem-solving and analytical skills (Correct answer)
Social media management

Correct answer: Problem-solving and analytical skills

Problem-solving and analytical skills are critical for aerospace technicians, as they need to identify and resolve malfunctions in complex systems. Diagnosing issues in aerospace systems requires a technical understanding and the ability to troubleshoot effectively.

Question 25: What does an FAA Production Approval Holder (PAH) authorization signify for an aircraft part manufacturer?

The manufacturer is approved to sell parts internationally
The manufacturer can train A&P mechanics
The manufacturer is authorized to produce FAA-approved aeronautical parts and articles for installation on certificated aircraft (Correct answer)
The manufacturer holds a repair station certificate

Correct answer: The manufacturer is authorized to produce FAA-approved aeronautical parts and articles for installation on certificated aircraft

A Production Approval Holder (PAH) has demonstrated to the FAA that their quality system can consistently produce aeronautical parts conforming to approved type design.

Question 26: Which data bus standard is used in modern aircraft such as the Boeing 787 for high-speed Ethernet-based avionics networking?

ARINC 664 (AFDX) (Correct answer)
ARINC 429
MIL-STD-1553
RS-232

Correct answer: ARINC 664 (AFDX)

ARINC 664 (AFDX – Avionics Full-Duplex Switched Ethernet) provides high-bandwidth, deterministic data networking used in the B787 and A380.

Question 27: What is the significance of a Technical Standard Order (TSO) authorization for an avionics component?

It certifies that the avionics component meets specific FAA minimum performance standards for its intended function (Correct answer)
It replaces the need for an 8130-3 release certificate
It authorizes the component for military use only
It certifies the component passed electromagnetic interference testing only

Correct answer: It certifies that the avionics component meets specific FAA minimum performance standards for its intended function

A TSO authorization confirms that an avionics or aircraft component meets the FAA's minimum performance standards, making it eligible for installation on certificated aircraft.

Question 28: What is the primary function of an aircraft Auxiliary Power Unit (APU)?

Power the landing gear extension system
Supply electrical power and bleed air when main engines are not running (Correct answer)
Provide supplemental engine thrust during takeoff
Control hydraulic system pressure on the ground

Correct answer: Supply electrical power and bleed air when main engines are not running

The APU provides electrical power and pneumatic bleed air for engine starting and environmental control when main engines are shut down.

Question 29: In avionics maintenance, what does the acronym BITE stand for?

Built-In Troubleshooting Engine
Basic Instrument Testing Environment
Binary Interface Transfer Equipment
Built-In Test Equipment (Correct answer)

Correct answer: Built-In Test Equipment

BITE (Built-In Test Equipment) refers to self-diagnostic hardware and software integrated into avionics units to detect and report system faults.

Question 30: What is the purpose of an aircraft's bleed air system?

To pressurize hydraulic reservoirs
To provide high-pressure hot air from the engine compressor for cabin pressurization, heating, and ice protection (Correct answer)
To purge fuel system vapors
To cool engine oil

Correct answer: To provide high-pressure hot air from the engine compressor for cabin pressurization, heating, and ice protection

Bleed air is extracted from engine compressor stages and used for cabin pressurization, air conditioning packs, wing anti-icing, and engine start systems.

Question 31: What is the primary advantage of eddy current testing (ECT) in aerospace inspections?

It measures material hardness accurately
It can detect cracks and corrosion in conductive materials through coatings and paint without surface preparation (Correct answer)
It works on composite materials without any contact
It provides three-dimensional imaging of internal defects

Correct answer: It can detect cracks and corrosion in conductive materials through coatings and paint without surface preparation

Eddy current testing induces electromagnetic currents in conductive materials and detects disruptions caused by cracks or corrosion, often through surface coatings without requiring paint removal.

Question 32: What must be documented when a non-conformance is discovered during aircraft component inspection?

The part identity, nature of the defect, disposition decision, and corrective action in a formal non-conformance report (Correct answer)
The inspection date and shift supervisor name only
Only the part number and the technician's initials
The cost estimate for repair

Correct answer: The part identity, nature of the defect, disposition decision, and corrective action in a formal non-conformance report

Non-conformance reports must fully document the affected part, the nature and extent of the defect, the disposition (use-as-is, repair, scrap), and corrective actions to prevent recurrence.

Question 33: What is the purpose of a Root Cause Analysis (RCA) following a maintenance quality escape?

To calculate the financial cost of the quality escape
To remove the affected aircraft from service permanently
To identify the underlying cause of a defect or error so that corrective actions can prevent recurrence (Correct answer)
To assign blame to the responsible technician

Correct answer: To identify the underlying cause of a defect or error so that corrective actions can prevent recurrence

RCA systematically investigates the true root cause of a quality escape beyond the immediate symptom, enabling corrective and preventive actions (CAPAs) that address the systemic issue.

Question 34: Which professional organization is the primary advocate for aviation maintenance technicians in the United States?

Air Line Pilots Association (ALPA)
Aircraft Owners and Pilots Association (AOPA)
National Business Aviation Association (NBAA)
Aviation Technician Education Council (ATEC) and Professional Aviation Maintenance Association (PAMA) (Correct answer)

Correct answer: Aviation Technician Education Council (ATEC) and Professional Aviation Maintenance Association (PAMA)

ATEC advocates for aviation maintenance education, while PAMA is the primary professional organization specifically representing aviation maintenance technicians and their career interests.

Question 35: What is a Major Repair as defined by 14 CFR Part 43?

Any repair requiring more than 8 hours of labor
A repair performed outside an approved facility
Any repair costing more than $10,000
A repair that might appreciably affect structural strength, flight characteristics, or airworthiness (Correct answer)

Correct answer: A repair that might appreciably affect structural strength, flight characteristics, or airworthiness

A Major Repair is defined as one that might appreciably affect structural strength, flight characteristics, powerplant operation, flight safety, or other airworthiness qualities.

Question 36: What does the Aviation Maintenance Technician Schools (AMTS) program under 14 CFR Part 147 govern?

The approval of international aviation maintenance training programs
The certification of aerospace technicians for military contracts
The continuing education requirements for certificated A&P mechanics
The certification and curriculum requirements for FAA-approved schools that train aviation mechanics (Correct answer)

Correct answer: The certification and curriculum requirements for FAA-approved schools that train aviation mechanics

14 CFR Part 147 establishes requirements for FAA-certificated Aviation Maintenance Technician Schools, including curriculum, facilities, and instruction standards for training A&P candidates.

Question 37: MIL-DTL-38999 circular electrical connectors used in aerospace applications feature which type of coupling mechanism?

Magnetic latching
Bayonet quarter-turn lock
Push-pull snap-fit
Threaded screw-type coupling (Correct answer)

Correct answer: Threaded screw-type coupling

MIL-DTL-38999 connectors use threaded coupling that provides a vibration-resistant, secure mating suitable for harsh aerospace and military environments.

Question 38: What does 'on-condition maintenance' mean in aerospace maintenance philosophy?

Maintenance performed only during scheduled overhauls
Maintenance performed at fixed calendar intervals
Maintenance triggered only after a failure occurs
Maintenance performed based on the actual condition of a component rather than a fixed time interval (Correct answer)

Correct answer: Maintenance performed based on the actual condition of a component rather than a fixed time interval

On-condition maintenance means a component remains in service as long as it meets defined performance standards, rather than being replaced at a fixed time interval.

Question 39: What does 'serviceable' mean when applied to an aircraft part?

The part has been serviced within the last 30 days
The part was manufactured by an FAA-approved supplier
The part is brand new and unused
The part meets all applicable airworthiness standards and is safe to install on a certificated aircraft (Correct answer)

Correct answer: The part meets all applicable airworthiness standards and is safe to install on a certificated aircraft

A serviceable part has been inspected and determined to meet all applicable airworthiness requirements, making it safe for installation regardless of whether it is new or used/overhauled.

Question 40: Which FAA regulation and advisory circular specifically governs Electrical Wiring Interconnection System (EWIS) installation requirements for transport category aircraft?

FAR Part 43 / AC 43.13-1B
FAR Part 23 / AC 23.1309
FAR Part 121 / AC 121-22
FAR Part 25 / AC 25.1701 (Correct answer)

Correct answer: FAR Part 25 / AC 25.1701

FAR Part 25 Subpart H (§25.1701–25.1733) and AC 25.1701 establish comprehensive EWIS design, installation, and maintenance requirements for transport category aircraft.

Question 41: Which technical skill is most relevant for a certified aerospace technician?

Expertise in musical theory
Knowledge of hydraulic and pneumatic systems (Correct answer)
Proficiency in legal studies
Mastery in video editing software

Correct answer: Knowledge of hydraulic and pneumatic systems

Aerospace technicians often work with hydraulic and pneumatic systems within aircraft, making knowledge of these systems critical. They are essential for operating various mechanical functions, like landing gear and flight control systems.

Question 42: What is the function of an Aircraft Maintenance Manual (AMM) Compliance Record?

To record the cost of each maintenance task
To document that each step of an AMM maintenance task was completed, providing traceability and verification of work performed (Correct answer)
To list which technicians are qualified to perform each task
To schedule the next maintenance visit

Correct answer: To document that each step of an AMM maintenance task was completed, providing traceability and verification of work performed

An AMM Compliance Record provides a step-by-step record showing each task step was completed and signed off, creating an auditable trail proving the work was performed correctly.

Question 43: What does TCAS stand for and what is its primary function?

Thrust Control Activation System; it manages auto-throttle
Terrain Clearance Alert System; it warns of ground proximity
Traffic Collision Avoidance System; it provides advisories to prevent mid-air collisions (Correct answer)
Total Control Avionics Suite; it integrates all flight computers

Correct answer: Traffic Collision Avoidance System; it provides advisories to prevent mid-air collisions

TCAS (Traffic Collision Avoidance System) independently monitors airspace for other transponder-equipped aircraft and provides Resolution Advisories to pilots to prevent collisions.

Question 44: What is the purpose of a 'First Article Inspection' in aerospace manufacturing quality?

To inspect the first aircraft delivered from the factory
To verify that the first production unit fully conforms to all engineering drawings and specifications before full production begins (Correct answer)
To test a part to failure to determine its maximum strength
To calibrate inspection tools before a production run

Correct answer: To verify that the first production unit fully conforms to all engineering drawings and specifications before full production begins

First Article Inspection (FAI) provides objective evidence that the production process can produce a part that meets all engineering requirements before committing to full-scale production.

Question 45: Which regulation requires aerospace maintenance facilities to have a Continuing Analysis and Surveillance System (CASS)?

14 CFR Part 65
14 CFR Part 43
14 CFR Part 121 (Correct answer)
14 CFR Part 91

Correct answer: 14 CFR Part 121

14 CFR Part 121 requires air carriers to have a Continuing Analysis and Surveillance System to monitor the effectiveness of their maintenance program.

Question 46: Which factor most contributes to opportunities for career advancement for an aerospace technician?

Posting regularly on social media about aerospace news
Volunteering at local community centers
Gaining experience in advanced repair techniques and obtaining additional certifications (Correct answer)
Focusing exclusively on entry-level maintenance tasks

Correct answer: Gaining experience in advanced repair techniques and obtaining additional certifications

By gaining specialized skills and certifications, such as those in advanced diagnostics, avionics, or non-destructive testing (NDT), aerospace technicians can enhance their qualifications and open doors to higher-level roles, such as lead technician or quality control inspector.

Question 47: What is the primary function of an aircraft's hydraulic system in large commercial aircraft?

To pressurize the cabin
To generate electrical power
To supply fuel to the engines
To actuate flight controls, landing gear, and brakes (Correct answer)

Correct answer: To actuate flight controls, landing gear, and brakes

Aircraft hydraulic systems use fluid under pressure to actuate primary and secondary flight controls, extend/retract landing gear, and apply brakes.

Question 48: What is the correct procedure for measuring aircraft fuel tank quantity with a drip stick?

Insert horizontally through the fuel cap opening to measure width
Dip the stick into the filler neck and measure wet length
Insert the calibrated stick into the tank sump until fuel wets it, then read the fuel level at the graduated markings (Correct answer)
Use the stick to check for water contamination at the sump drain

Correct answer: Insert the calibrated stick into the tank sump until fuel wets it, then read the fuel level at the graduated markings

A drip stick (tank quantity gauge) is inserted through the sump fitting until fuel wets the calibrated portion, allowing the technician to read fuel quantity directly from graduated markings.

Question 49: In a reciprocating aircraft engine, what is the function of the magneto?

To control fuel mixture ratio
To generate high-voltage electrical current to fire the spark plugs independently of the aircraft electrical system (Correct answer)
To measure engine RPM
To regulate engine oil pressure

Correct answer: To generate high-voltage electrical current to fire the spark plugs independently of the aircraft electrical system

Magnetos are self-contained AC generators that produce high-voltage current to fire spark plugs, operating independently of the aircraft battery and alternator for reliability.

Question 50: What is the significance of an FAA Form 8130-3 'Authorized Release Certificate'?

It records fuel uplift quantities
It certifies a repair station's annual inspection
It documents that an aircraft part was approved for return to service or manufactured under FAA authority (Correct answer)
It authorizes a technician to perform engine runups

Correct answer: It documents that an aircraft part was approved for return to service or manufactured under FAA authority

FAA Form 8130-3 is the standard airworthiness approval tag that accompanies parts, certifying they were produced under FAA authority or approved for return to service after maintenance.

Question 51: What does the military specification MIL-W-22759 govern in aerospace applications?

Aircraft hydraulic tubing dimensions
Flexible hookup wire for aerospace and military use (Correct answer)
Military aviation hydraulic fluid lines
Structural fastener installation procedures

Correct answer: Flexible hookup wire for aerospace and military use

MIL-W-22759 specifies flexible hookup wire for aerospace use, typically with PTFE or ETFE insulation, rated for high temperature and harsh environments.

Question 52: What is the primary use of dye penetrant inspection (DPI) in aerospace maintenance?

To check for internal subsurface voids
To measure material thickness
To detect surface-breaking cracks and defects in non-porous materials (Correct answer)
To identify corrosion beneath paint

Correct answer: To detect surface-breaking cracks and defects in non-porous materials

Dye penetrant inspection uses a colored or fluorescent penetrant that seeps into surface-breaking defects, revealing cracks and porosity on the surface of non-porous materials after developer is applied.

Question 53: In a turbofan engine, what is the purpose of the bypass ratio?

It describes the ratio of air bypassing the engine core to air flowing through the core (Correct answer)
It measures fuel-to-air mixture
It indicates the ratio of turbine stages to compressor stages
It defines the thrust reverser efficiency

Correct answer: It describes the ratio of air bypassing the engine core to air flowing through the core

Bypass ratio is the ratio of mass airflow bypassing the engine core to airflow through the core, with higher ratios indicating more fuel-efficient high-bypass turbofan engines.

Question 54: Which of the following technical skills is most relevant to a certified aerospace technician's background?

Familiarity with hotel management software
Proficiency in watercolor painting
Knowledge of airframe structures and avionics systems (Correct answer)
Expertise in social media marketing

Correct answer: Knowledge of airframe structures and avionics systems

Knowledge of airframe structures and avionics is crucial for aerospace technicians, as these areas are fundamental to maintaining and repairing aircraft. Skills in painting, hotel management, or social media are unrelated to the technical requirements of aerospace technology.

Question 55: What is the purpose of a compression tester in reciprocating engine maintenance?

To measure the ability of each cylinder to hold compressed air, indicating the condition of valves, piston rings, and cylinder walls (Correct answer)
To measure crankshaft end play
To check fuel injector spray patterns
To test magneto timing accuracy

Correct answer: To measure the ability of each cylinder to hold compressed air, indicating the condition of valves, piston rings, and cylinder walls

A differential compression tester applies regulated air pressure to each cylinder and measures pressure drop to diagnose valve leakage, ring wear, and cylinder wall condition.

Question 56: What is the purpose of the Aviation Maintenance Alerts (AMA) publication produced by the FAA?

To share safety lessons from difficulty and defect reports submitted by technicians so the industry can learn from real maintenance findings (Correct answer)
To publish FAA inspector surveillance schedules
To announce new airworthiness directives before they are officially issued
To list aircraft models approved for night VFR operations

Correct answer: To share safety lessons from difficulty and defect reports submitted by technicians so the industry can learn from real maintenance findings

Aviation Maintenance Alerts compile and share actual defect reports and maintenance difficulties submitted to the FAA, helping technicians industry-wide learn from real-world findings and prevent similar problems.

Question 57: At what frequency do most aircraft AC electrical systems operate?

50 Hz
400 Hz (Correct answer)
800 Hz
60 Hz

Correct answer: 400 Hz

Aircraft AC systems operate at 400 Hz, which allows transformers and motors to be significantly smaller and lighter than 60 Hz ground-based equipment.

Question 58: When using an ohmmeter to test electrical continuity in aircraft wiring, what reading indicates a complete circuit?

Infinite resistance (OL)
Near-zero ohms resistance (Correct answer)
50 ohms or more
Battery voltage reading

Correct answer: Near-zero ohms resistance

A near-zero ohms reading on an ohmmeter indicates a complete, low-resistance circuit path (continuity), while infinite resistance (OL) indicates an open circuit.

Question 59: Which tool is used to measure the inside diameter of a cylinder bore to check for wear or out-of-round condition?

Vernier caliper only
Telescoping gauge and micrometer, or a dial bore gauge (Correct answer)
Surface plate and height gauge
Thread gauge

Correct answer: Telescoping gauge and micrometer, or a dial bore gauge

A telescoping gauge (used with a micrometer for measurement) or a dial bore gauge directly measures cylinder bore diameter to detect wear, taper, or out-of-round conditions beyond limits.

Question 60: What is the function of a Constant Current Regulator (CCR) used in aircraft runway lighting circuits?

Convert AC power to DC for approach lighting systems
Dim cockpit lighting during night operations
Detect and report burned-out runway light bulbs to the tower
Maintain steady current through series-connected lamp circuits regardless of lamp count (Correct answer)

Correct answer: Maintain steady current through series-connected lamp circuits regardless of lamp count

A CCR regulates current (not voltage) in series-connected airfield lighting circuits so that all lamps receive consistent brightness even as individual lamps burn out.

Question 61: What type of NDT method uses high-frequency sound waves to detect internal defects in aircraft structures?

Ultrasonic Testing (UT) (Correct answer)
Radiographic Testing
Thermographic Inspection
Eddy Current Testing

Correct answer: Ultrasonic Testing (UT)

Ultrasonic Testing sends high-frequency sound waves through material and analyzes reflections to detect internal voids, cracks, inclusions, and delaminations in both metallic and composite structures.

Question 62: How does knowledge of safety regulations benefit a certified aerospace technician?

It helps them design new aerospace technology.
It helps them advance quickly into management positions.
It allows them to work independently without supervision.
It ensures they comply with industry standards to maintain safety. (Correct answer)

Correct answer: It ensures they comply with industry standards to maintain safety.

Understanding safety regulations ensures that aerospace technicians adhere to FAA and OSHA standards, which are necessary for maintaining a safe work environment and preventing potential hazards during aircraft maintenance and operations.

Question 63: What is 'Continuous Airworthiness Maintenance Program' (CAMP) for air carriers?

A voluntary safety reporting platform for technicians
A software application for scheduling maintenance tasks
A structured program defining all maintenance, inspection, and overhaul requirements to keep an air carrier's aircraft continuously airworthy (Correct answer)
A government-run training program for FAA inspectors

Correct answer: A structured program defining all maintenance, inspection, and overhaul requirements to keep an air carrier's aircraft continuously airworthy

CAMP is a comprehensive maintenance program required under Part 121/135 that specifies inspection intervals, overhaul requirements, and maintenance procedures to ensure continuous airworthiness of the air carrier's fleet.

Question 64: What is RTCA DO-160 and why is it important to aerospace technicians?

It defines crew rest requirements for long-haul flights
It establishes turbine engine certification standards
It specifies the structural load requirements for aircraft fuselages
It defines environmental and electromagnetic test conditions for airborne equipment, ensuring avionics can withstand aircraft operating conditions (Correct answer)

Correct answer: It defines environmental and electromagnetic test conditions for airborne equipment, ensuring avionics can withstand aircraft operating conditions

RTCA DO-160 specifies environmental and electromagnetic compatibility (EMC) test conditions for airborne equipment, ensuring avionics can function reliably in the temperature, vibration, and EMC environment of aircraft.

Question 65: Under FAA regulations, who is responsible for ensuring that maintenance is performed properly on a certificated aircraft?

The repair station manager only
The FAA directly
The aircraft owner or operator (Correct answer)
The aircraft manufacturer

Correct answer: The aircraft owner or operator

Under 14 CFR Part 91, the aircraft owner or operator bears ultimate responsibility for ensuring maintenance is performed correctly and that the aircraft is airworthy before flight.

Question 66: Under 14 CFR Part 65, an Aviation Mechanic Certificate with Airframe and Powerplant ratings is commonly referred to as what?

CAT License
Inspection Authorization
Type Rating
A&P Certificate (Correct answer)

Correct answer: A&P Certificate

An Aviation Mechanic Certificate with both Airframe and Powerplant ratings is commonly called an A&P Certificate, the standard credential for most aerospace technicians.

Question 67: What is the purpose of using a tensiometer in aircraft maintenance?

To test the tensile strength of structural fasteners
To calibrate altimeter capsule tension
To measure cable tension in flight control cables to verify correct rigging (Correct answer)
To measure surface tension of hydraulic fluids

Correct answer: To measure cable tension in flight control cables to verify correct rigging

A tensiometer measures the tension in flight control cables, allowing technicians to verify cables are rigged to the manufacturer's specified tension for correct control response.

Question 68: What is the function of an aircraft's pitot-static system?

To control cabin pressurization
To cool avionics equipment
To direct boundary layer airflow over the wing
To measure airspeed, altitude, and vertical speed by sensing air pressure (Correct answer)

Correct answer: To measure airspeed, altitude, and vertical speed by sensing air pressure

The pitot-static system uses pitot (dynamic) and static air pressure measurements to drive the airspeed indicator, altimeter, and vertical speed indicator.

Question 69: Which navigation system uses a network of VHF ground-based transmitters to provide azimuth information to aircraft?

ADS-B
VOR (Correct answer)
GPS
TCAS

Correct answer: VOR

VOR (VHF Omnidirectional Range) uses ground station radio transmissions to provide magnetic bearing information to airborne receivers.

Question 70: Which aerospace standard specifically governs the requirements for aerospace manufacturers' quality management systems in the United States?

ISO 9001
AS9100 (Correct answer)
MIL-STD-1520
ARP4754

Correct answer: AS9100

AS9100 is the aerospace-specific quality management standard that supplements ISO 9001 with additional requirements for safety, risk management, configuration management, and first article inspection.

SpaceTEC Certified Aerospace Technician (CAT) Core

The SpaceTEC Certified Aerospace Technician (CAT) Core certification validates foundational technical knowledge for aerospace industry professionals across six core competency areas. It is a nationally recognized credential backed by the National Science Foundation's Center for Aerospace Technical Education.

Questions

90 min

Time Limit

67%

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