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Maximum bolts in a series for widely spaced double twist wiring

Aviation Mechanic General (AMG) practice question 11 of 33 on Aircraft Materials, Hardware, and Processes. ACS element AM.I.E.K5 · difficulty: standard. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONA mechanic is safety wiring a row of widely spaced drilled-head bolts using the double twist method. What is the maximum number of bolts that should be wired together in one series?

  1. AFive
  2. BThree
  3. CAs many as a 24-inch wire reaches
Show the answer and explanation

Correct answer: B. Three

  • A — incorrect No group of five is permitted for widely spaced bolts; the handbook limits a series to three.
  • B — correct When safety wiring widely spaced bolts by the double twist method, a group of three should be the maximum number in a series.
  • C — incorrect The 24-inch length of wire is the limit for closely spaced bolts, not for widely spaced bolts.

BACKGROUND

When drilled-head bolts, screws, or other parts are grouped together, they are more conveniently safety wired to each other in a series rather than individually. The number of units that may be wired together depends on the application. When safety wiring widely spaced bolts by the double twist method, a group of three should be the maximum number in a series. When safety wiring closely spaced bolts, the number that can be safety wired by a 24-inch length of wire is the maximum in a series. In every case the wire is arranged so that if a bolt begins to loosen, the force applied to the wire is in the tightening direction.

STUDY TIP

Distinguish widely spaced (three maximum) from closely spaced (as many as a 24-inch wire covers).

KEY POINTS

  • Widely spaced bolts, double twist: maximum of three in a series.
  • Closely spaced bolts: limited by a 24-inch length of wire.
  • Wire is routed so loosening pulls the wire in the tightening direction.

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.