AAC Aircraft Systems & Components — Questions and Answers

Question 1: How many main rotor blades does the UH-60 Black Hawk have?

2
3
4 (Correct answer)
5

Correct answer: 4

The UH-60 uses a four-bladed fully articulated main rotor system.

Question 2: Which rotor configuration does the CH-47 Chinook use?

Single main rotor with tail rotor
Tandem rotors (Correct answer)
Coaxial rotors
Intermeshing rotors

Correct answer: Tandem rotors

The CH-47 has two counter-rotating rotors mounted fore and aft in a tandem layout.

Question 3: What is the primary function of a single-rotor helicopter's tail rotor?

Provide forward thrust
Counteract main rotor torque and provide directional control (Correct answer)
Increase main rotor RPM
Cool the transmission

Correct answer: Counteract main rotor torque and provide directional control

The tail rotor offsets the torque reaction of the main rotor and lets the pilot control yaw.

Question 4: What does the swashplate assembly do?

Transmits flight control inputs from the stationary controls to the rotating rotor blades (Correct answer)
Filters transmission oil
Dampens fuselage vibration
Supplies bleed air to the cabin

Correct answer: Transmits flight control inputs from the stationary controls to the rotating rotor blades

The swashplate converts collective and cyclic inputs into blade pitch changes on the rotating system.

Question 5: Which engine family powers the UH-60 Black Hawk?

T55
T53
T700 (Correct answer)
PT6

Correct answer: T700

The UH-60 is powered by twin General Electric T700-series turboshaft engines.

Question 6: Which engine powers the CH-47 Chinook?

T700
T55 (Correct answer)
T53
T64

Correct answer: T55

The CH-47 uses two Honeywell (Lycoming) T55 turboshaft engines.

Question 7: What is the purpose of the freewheeling unit (overrunning clutch) in a helicopter drivetrain?

Increase engine torque output
Allow the rotor to keep turning if the engine stops, enabling autorotation (Correct answer)
Lock the rotor during ground operations
Synchronize the tail rotor with the main rotor

Correct answer: Allow the rotor to keep turning if the engine stops, enabling autorotation

The freewheeling unit disengages the engine from the drivetrain when engine RPM drops below rotor RPM.

Question 8: Which fire-resistant hydraulic fluid is standard in most Army aircraft hydraulic systems?

MIL-PRF-83282 (Correct answer)
MIL-PRF-23699
JP-8
MIL-PRF-81322

Correct answer: MIL-PRF-83282

MIL-PRF-83282 is the synthetic, fire-resistant hydraulic fluid used in Army aircraft.

Question 9: MIL-PRF-23699 is used as what type of product?

Hydraulic fluid
Synthetic turbine engine lubricating oil (Correct answer)
Corrosion preventive compound
Wheel bearing grease

Correct answer: Synthetic turbine engine lubricating oil

MIL-PRF-23699 is a synthetic ester-based lubricating oil for gas turbine engines and transmissions.

Question 10: What is the primary turbine fuel used in Army aircraft?

AVGAS 100LL
JP-8 (Correct answer)
Diesel DF-2
Motor gasoline

Correct answer: JP-8

JP-8 is the standard kerosene-based military turbine fuel.

Question 11: What is the main purpose of an auxiliary power unit (APU)?

Provide extra thrust in forward flight
Supply electrical and pneumatic power for engine start and ground operations (Correct answer)
Replace the tail rotor in hover
Pressurize the fuel tanks in flight

Correct answer: Supply electrical and pneumatic power for engine start and ground operations

The APU lets the crew start engines and run systems on the ground without external power.

Question 12: Which instruments rely on the pitot-static system?

Torque meter, Ng, Np
Airspeed indicator, altimeter, and vertical speed indicator (Correct answer)
Attitude indicator and turn coordinator
Fuel quantity and fuel flow

Correct answer: Airspeed indicator, altimeter, and vertical speed indicator

Pitot (ram) and static pressure drive the airspeed indicator, altimeter, and VSI.

Question 13: What does a chip detector in a gearbox or engine oil system indicate?

Low oil temperature
Metal particles in the oil, suggesting internal wear (Correct answer)
Water contamination in fuel
Excessive hydraulic pressure

Correct answer: Metal particles in the oil, suggesting internal wear

A magnetic chip detector collects ferrous debris and triggers a caution light when it bridges the contacts.

Question 14: What is the function of an accumulator in a hydraulic system?

Filter contaminants
Store fluid under pressure and dampen pressure surges (Correct answer)
Cool the hydraulic fluid
Measure fluid quantity

Correct answer: Store fluid under pressure and dampen pressure surges

Accumulators store pressurized fluid for peak demand and absorb pressure spikes.

Question 15: On the UH-60, what is the main function of the intermediate gearbox?

Reduce engine RPM to main rotor RPM
Change the direction of the tail rotor drive shaft where the tail pylon angles upward (Correct answer)
Drive the hydraulic pumps
Power the APU

Correct answer: Change the direction of the tail rotor drive shaft where the tail pylon angles upward

The intermediate gearbox redirects the tail rotor drive angle at the base of the tail pylon.

Question 16: Why are bonding jumpers installed between aircraft structural components?

Add structural strength
Provide an electrical path to equalize potential and dissipate static charges (Correct answer)
Reduce weight
Hold wiring bundles in place

Correct answer: Provide an electrical path to equalize potential and dissipate static charges

Bonding gives a low-resistance path that prevents arcing, static buildup, and radio interference.

Question 17: What hazard is most closely associated with nickel-cadmium aircraft batteries?

Freezing of electrolyte at room temperature
Thermal runaway (Correct answer)
Sulfation from undercharging
Hydrogen-free operation

Correct answer: Thermal runaway

Ni-Cd batteries can overheat uncontrollably when temperature rises and internal resistance drops during charging.

Question 18: In the AH-64 Apache, where is the copilot/gunner (CPG) seated?

Rear seat
Front seat (Correct answer)
Side-by-side on the left
Side-by-side on the right

Correct answer: Front seat

The AH-64 has tandem seating with the pilot in the rear and the CPG in the front.

Question 19: What is commonly used to anti-ice the inlets of turboshaft engines like the T700?

Electric heating blankets only
Engine bleed air (Correct answer)
Glycol spray
Exhaust gas recirculation

Correct answer: Engine bleed air

Hot compressor bleed air is routed to the inlet areas to prevent ice formation.

Question 20: What does the torque indicator in a helicopter primarily show?

Rotor blade angle
Engine power output and drivetrain load (Correct answer)
Fuel pressure
Airspeed

Correct answer: Engine power output and drivetrain load

Torque shows how much power the engine delivers to the drivetrain, usually as a percentage.

Question 21: Why is safety wire used on aircraft fasteners?

Improve electrical bonding
Prevent fasteners from loosening due to vibration (Correct answer)
Mark components for inspection
Reduce corrosion

Correct answer: Prevent fasteners from loosening due to vibration

Safety wire keeps bolts, nuts, and plugs from backing out under vibration.

AAC Aircraft Systems & Components

How many main rotor blades does the UH-60 Black Hawk have?

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