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0014050 ax-43 Federal Aviation Agency AC NO: 20-45
RAL NATION AG AIRCRAFT
ADVISORY CIRCULAR EFFECTIVE :
9/17/65
CO STATES OF ARE SUBJECT: SAFETYING OF TURNBUCKLES ON CIVIL AIRCRAFT I. PURPOSE. To provide information on turnbuckle safetying methods that have been found acceptable by the Agency during past aircraft type certification programs.
2. INFORMATION. The following cable system turnbuckle safetying devices have been approved, under current airworthiness regulations, for use in civil aircraft:
a. Clip locking devices specified in military standard MS 33736;
b. Double-wrap safety wire as specified in military standard MS 33591; and
c. Turnbuckle safetying devices meeting TSO-C21.
Gebrge S. Moore Director Flight Standards Service 66-3627