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Most common safety wiring method

Aviation Mechanic General (AMG) practice question 12 of 33 on Aircraft Materials, Hardware, and Processes. ACS element AM.I.E.K5 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONWhich method of safety wiring nuts, bolts, and screws is the most common?

  1. AThe double twist method
  2. BThe single wire method
  3. CThe single wrap spiral method
Show the answer and explanation

Correct answer: A. The double twist method

  • A — correct The handbook states that the double twist method is the most common method of safety wiring nuts, bolts, and screws.
  • B — incorrect The single wire method is reserved for small screws in a closely spaced closed geometrical pattern, parts in electrical systems, and places that are extremely difficult to reach.
  • C — incorrect Single wrap methods are wire-wrapping techniques for turnbuckles and are described as not the equal of the double wrap methods.

BACKGROUND

Safety wiring is the most positive and satisfactory method of safetying cap screws, studs, nuts, bolt heads, and turnbuckle barrels that cannot be safetied by any other practical means. Nuts, bolts, and screws are safety wired by the single wire or double twist method, and the double twist method is the most common. The single wire method may be used on small screws in a closely spaced closed geometrical pattern, on parts in electrical systems, and in places that are extremely difficult to reach. Safety wiring should always follow conventional methods or the manufacturer's requirements.

STUDY TIP

Treat double twist as the default and learn the three specific situations where the single wire method is allowed.

KEY POINTS

  • Double twist is the most common safety wiring method.
  • Single wire is limited to closely spaced small screws, electrical parts, and hard-to-reach places.
  • Safety wire counteracts any tendency of a unit to loosen.

SOURCES

  • FAA-H-8083-30B ch07 "Safety Wiring" (Nuts, Bolts, & Screws)
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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.