Airframe Mechanic Airframe Inspection Procedures Questions and Answers

Question 1

A mechanic is inspecting a main wing spar made of aluminum alloy for suspected subsurface cracks originating from a fastener hole. Which NDT method is most effective for this specific task?

Accepted Answer

Eddy Current Inspection

Answer

Eddy current inspection is highly effective at detecting surface and near-surface flaws in conductive materials, like aluminum. It is particularly well-suited for finding cracks around fastener holes. Magnetic particle is for ferrous metals, dye penetrant only finds surface-breaking cracks, and tap testing is for composite delamination.

Question 2

During a detailed fuselage inspection, a mechanic notes fine, worm-like filaments of corrosion forming under the paint near a lap joint. This observation is most characteristic of which type of corrosion?

Accepted Answer

Filiform Corrosion

Answer

Filiform corrosion is characterized by its distinctive thread-like or worm-like appearance as it creeps under a coating, such as paint. [1, 21] It is common on aluminum and steel surfaces, especially in high-humidity environments. [1, 10, 21]

Question 3

Which of the following statements correctly describes a key relationship between a 100-hour inspection and an annual inspection?

Accepted Answer

The scope and detail of an annual inspection can be used to satisfy the requirements of a 100-hour inspection.

Answer

According to 14 CFR 91.409, an annual inspection is required for most aircraft every 12 calendar months. A 100-hour inspection is required for aircraft operated for hire. [13, 16] The scope of an annual inspection is identical to or more comprehensive than a 100-hour inspection, so it can be used to meet the 100-hour requirement, but the reverse is not true. An A&P can perform a 100-hour inspection, but an A&P with Inspection Authorization (IA) is required for an annual. [9, 16]

Question 4

An aircraft is subject to a mandatory, legally enforceable rule issued by the FAA that requires a specific inspection of the horizontal stabilizer attachment fittings due to a known unsafe condition. This type of rule is known as a(n):

Accepted Answer

Airworthiness Directive (AD)

Answer

An Airworthiness Directive (AD) is a legally enforceable regulation issued by the FAA to correct an unsafe condition found in a product (aircraft, engine, propeller, or appliance). [8, 17, 20] Compliance is mandatory. [20] Service Bulletins are recommendations from the manufacturer and are not legally mandatory unless referenced in an AD.

Question 5

When an inspector performs a 'tap test' on a bonded honeycomb composite panel, what is the primary type of defect they are trying to detect?

Accepted Answer

Delamination or disbond between the face sheet and core

Answer

Tap testing is a common non-destructive inspection method for composite structures. A sharp, clear 'ring' indicates a good bond, while a dull 'thud' sound indicates a void, delamination, or disbond between the skin and the honeycomb core. [18, 24, 30]

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Airframe Inspection Procedures Questions and Answers