Airframe Mechanic Certification Airframe Inspection Procedures 4

Question 1

During a hard landing inspection, which structural area requires priority examination on a conventional gear aircraft?

Accepted Answer

Firewall, engine mounts, and main gear attachment structure

Answer

Hard landing loads transfer through the main gear into the attachment structure and firewall area, making these areas the priority for overload damage.

Question 2

What is the maximum allowable depth of a scratch on a structural aluminum tube before repair or replacement is required, according to AC 43.13-1B?

Accepted Answer

10% of wall thickness

Answer

AC 43.13-1B limits scratches in structural tubing to 10% of wall thickness; deeper scratches require repair or replacement.

Question 3

Which regulatory reference would a mechanic consult to determine if a specific airframe repair is classified as major or minor?

Accepted Answer

14 CFR Part 43, Appendix A

Answer

14 CFR Part 43, Appendix A defines major alterations, major repairs, and minor repairs and alterations for airframes and other aircraft systems.

Question 4

When performing a visual inspection of flight control cables, which condition would most likely require replacement of the cable?

Accepted Answer

Three broken wires in one lay of a 7×19 cable

Answer

AC 43.13-1B states that cables with three or more broken wires in one lay length are typically cause for rejection and replacement.

Question 5

A mechanic finds corrosion on a steel tubular fuselage truss. After removing the corrosion, the affected tube wall thickness is reduced by 15%. What should be done?

Accepted Answer

Consult the manufacturer's structural repair manual; likely replacement or reinforcement is needed

Answer

Wall thickness reduction of 15% on a structural tube likely exceeds acceptable limits and requires engineering data or SRM guidance before return to service.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Airframe Inspection Procedures 4