AMT General Aircraft Maintenance Knowledge 2 — Questions and Answers
Question 1: When inspecting a steel control cable for airworthiness, what is the maximum number of broken wires allowed in any one lay length of a 7×19 cable before it must be replaced?
- 1 broken wire
- 2 broken wires
- 3 broken wires (Correct answer)
- 6 broken wires
Correct answer: 3 broken wires
FAA AC 43.13-1B states that a 7×19 cable must be replaced if 3 or more wires are broken in one lay length.
Question 2: Which type of torque wrench displays the applied torque on a dial or digital readout without requiring the technician to preset a value?
- Preset click-type torque wrench
- Indicating (deflecting beam) torque wrench (Correct answer)
- Slip-type torque wrench
- Impact torque wrench
Correct answer: Indicating (deflecting beam) torque wrench
Indicating or deflecting-beam torque wrenches show live torque on a scale or display, allowing the technician to read the value directly as force is applied.
Question 3: In the AN hardware system, what does the letter 'D' following the dash number on a bolt designation indicate?
- Drilled shank for cotter pin safety (Correct answer)
- Reduced-diameter shank
- Extra-close tolerance
- Dual-heat-treated alloy steel
Correct answer: Drilled shank for cotter pin safety
The 'D' suffix on an AN bolt indicates the shank is drilled to accept a cotter pin or safety wire for positive locking.
Question 4: An AMT is installing a new compass and must verify its accuracy. What is the maximum allowable deviation error for a magnetic compass after compensation?
- 1° on any heading
- 5° on any heading (Correct answer)
- 10° on any heading
- 3° on cardinal headings only
Correct answer: 5° on any heading
14 CFR Part 23 and AC 43.13 require that residual magnetic compass deviation not exceed 10° on any heading after compensation — but FAA practical test standards and most aircraft specs call for no more than ±10°; however, the common AMT written test answer is 10°.
Question 5: What document must an AMT complete and sign to return an aircraft to service after a 100-hour inspection?
- FAA Form 8110-3
- Maintenance Release (FAA Form 337)
- Aircraft maintenance record entry signed under 14 CFR 43.11 (Correct answer)
- AC Form 8050-1
Correct answer: Aircraft maintenance record entry signed under 14 CFR 43.11
14 CFR 43.11 requires the inspector to make a signed logbook entry with the date, aircraft hours, type of inspection, and a statement that the aircraft is airworthy or describing discrepancies.
Question 6: Which heat-treatment process increases the surface hardness of steel parts while keeping the core relatively soft and tough?
- Annealing
- Normalizing
- Case hardening (carburizing) (Correct answer)
- Solution heat treatment
Correct answer: Case hardening (carburizing)
Case hardening diffuses carbon into the surface layer of low-carbon steel, creating a hard wear-resistant case over a ductile, impact-resistant core.
Question 7: When safety-wiring a group of bolts using the single-wire method, which direction should the wire be routed so the bolt cannot rotate in the loosening direction?
- Counterclockwise around each bolt head
- From the first bolt to the second so tension pulls each bolt in the tightening direction (Correct answer)
- Any direction as long as all bolt heads are looped
- Directly to the nearest structural attachment point
Correct answer: From the first bolt to the second so tension pulls each bolt in the tightening direction
Safety wire must be routed so that any tendency for a fastener to loosen will instead put the wire in tension, pulling the fastener toward the tightening direction.
AMT General Aircraft Maintenance Knowledge 2
When inspecting a steel control cable for airworthiness, what is the maximum number of broken wires allowed in any one lay length of a 7×19 cable before it must be replaced?