Page 209 2
nd
Edition – Rev 0
02-40
SAFETYING – MAINTENANCE PRACTICES
Turnebuckles
All turnbuckles must be safetied with safety wire using either the double or single-wrap
method herein shown, or with any appropriately approved special safetying device complying
with the requirements of FAA Technical Standard Order TSO-C21.
Do not reuse safety wire.
Before securing turnbuckles, threaded terminals should be screwed into the turnbuckle barrel
until no more than three threads of either terminal are outside the barrel. After that, the
turnbuckle has been adjusted for proper cable tension.
All lock wire used in the safetying of turnbuckles should be carbon steel, corrosion- resistant
steel, nickel-chromium iron alloy (inconel), nickel-copper alloy (monel) or aluminium alloy.
For safety cable diameter of safety wire size and material, refer to the table below (dimension
in inches):
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