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Proof-load test of a newly swaged cable terminal

Aviation Mechanic Airframe (AMA) practice question 9 of 16 on Flight Controls. ACS element AM.II.C.K1 · difficulty: applied. Want to answer it in a timed quiz? Use the Aviation Mechanic Airframe (AMA) practice mode.

Question bank updated 2026-09-22

QUESTIONA newly installed swage-type terminal is fitted to a control cable whose rated breaking strength is 2,000 pounds. What proof-load test should be applied before the cable is installed?

  1. A1,200 pounds for at least 30 seconds
  2. B1,200 pounds for at least 3 minutes
  3. C1,600 pounds for a minimum of 3 minutes
Show the answer and explanation

Correct answer: B. 1,200 pounds for at least 3 minutes

  • A — incorrect The load value is right, but the load must be held for at least 3 minutes, not 30 seconds.
  • B — correct The test load equals 60 percent of the rated breaking strength, so 0.60 × 2,000 = 1,200 pounds, and the load is held for at least 3 minutes.
  • C — incorrect That figure is 80 percent of the breaking strength; the specified proof load is 60 percent.

BACKGROUND

Locally fabricated splices and newly installed swage terminal cable fittings are proof-load tested for proper strength before the cable is installed. The test load is applied slowly and is equal to 60 percent of the rated breaking strength of the cable, and that load is held for at least 3 minutes. Testing of this type can be dangerous, so suitable guards should be placed over the cable during the test to protect personnel if the cable fails. If a proper test fixture is not available, the load test should be contracted out to a properly equipped facility. The terminal is also inspected after swaging for die marks, splits, out-of-round condition, cable slippage, and broken wire strands.

STUDY TIP

Memorize the pair of numbers — 60 percent of rated breaking strength, held at least 3 minutes — and practice applying the percentage to a given cable strength.

KEY POINTS

  • Proof load equals 60 percent of the cable's rated breaking strength.
  • The load is held for at least 3 minutes.
  • Guards must be placed over the cable during the test to protect personnel.

SOURCES

  • sources/ama-airframe/ch02.txt "Swage-type terminals" / proof-loading procedure
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-31B Aviation Maintenance Technician Handbook – Airframe, and 14 CFR part 43. Regulations and handbooks are revised; confirm details against the current edition.