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Airloc fastener cross pin reuse

Aviation Mechanic General (AMG) practice question 22 of 33 on Aircraft Materials, Hardware, and Processes. ACS element AM.I.E.K4 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONOnce the cross pin has been removed from an Airloc fastener stud, what should be done with it?

  1. AReplace it with a new pin
  2. BReinstall it if it shows no wear
  3. CReuse it up to three times, then discard it
Show the answer and explanation

Correct answer: A. Replace it with a new pin

  • A — correct The Airloc cross pin should never be used a second time; once removed from the stud, it is replaced with a new pin.
  • B — incorrect Condition does not matter. The cross pin is a one-use part and is replaced whenever it is removed from the stud.
  • C — incorrect There is no allowance for repeated use. A removed cross pin is always replaced with a new one.

BACKGROUND

The Airloc fastener consists of three parts: a stud, a cross pin, and a stud receptacle. The studs are made of steel and case hardened to prevent excessive wear, and the stud hole is reamed for a press fit of the cross pin. The cross pin is made from chrome-vanadium steel and heat-treated for maximum strength, wear, and holding power. It should never be used a second time; once removed from the stud, it is replaced with a new pin. The total material thickness each stud locks together is stamped on the stud head in thousandths of an inch.

STUDY TIP

Treat the Airloc cross pin like a cotter pin: once out, it is scrap.

KEY POINTS

  • An Airloc fastener has a stud, a cross pin, and a receptacle.
  • The cross pin is never reused; replace it with a new pin after removal.
  • Stud length is selected from the total material thickness stamped on the stud head.

SOURCES

  • FAA-H-8083-30B ch07 "Airloc Fasteners"
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MORE ON AIRCRAFT MATERIALS, HARDWARE, AND PROCESSES

SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.