FAA Aviation Mechanic General (AMG)Materials, Hardware and ProcessesHard
A technician is safety-wiring a turnbuckle on a flight control cable using the double-wrap method. According to acceptable practice, how many wraps of wire must be made around each turnbuckle terminal?
- AAt least 1 wrap
- BAt least 6 wraps
- CAt least 2 wraps
- DAt least 4 wraps
Show answer & explanationAnswer & explanation
Correct answer: C. At least 2 wraps
In the double-wrap turnbuckle safetying method, the wire is passed through the hole in the barrel/terminal and wrapped completely around each end fitting at least twice before twisting off, ensuring the turnbuckle cannot rotate and loosen. Fewer wraps do not provide adequate security, while excessive wraps are unnecessary and add bulk without benefit.
Why the other options are wrong
- A. A single wrap does not provide sufficient security to prevent turnbuckle rotation.
- B. Six wraps is excessive and not part of standard turnbuckle safetying practice.
- D. Four wraps exceed the standard requirement and are not called for in this method.
Turnbuckle Double-Wrap Safety Method
A method of safety-wiring turnbuckles where wire is wrapped at least twice around each terminal end to prevent the barrel from rotating and loosening the cable tension.
- Minimum of 2 wraps around each terminal required
- Alternative methods include single-wrap and clip-locking pin
- Purpose is to prevent turnbuckle barrel rotation in flight
Memory trick: 'Double wrap, double security' - wrap twice around each end