Zlin Aviation
Section 2
Maintenance Manual Line Maintenance, Repairs and Alterations
Issued: 01/02/2006
QAP-AMM-Rev02
Date of latest Revision: 23/01/2013
Page Number: 2-8
2.3.2.2 SAFETY WIRE INSTALLATION TO TURNBUCKLES
The following is a partial extract from FAA AC 43.13-1B.
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 the turnbuckle has been
adjusted for proper cable tension, two pieces of safety wire are inserted, half the wire length into the
hole in the center of the turnbuckle barrel. The safety-wires are bent so that each wire extends half
the length of the turnbuckle on top and half on bottom.
The ends of the wires are passed through the
hole in the turnbuckle eyes or between the jaws of the
turnbuckle fork, as applicable. The
wires are then bent toward the center of the turnbuckle
and each wire is wrapped around the shank four times,
binding the wrapping
wires in place as shown in the figure below.
a. When a swaged terminal
is being secured, one wire
is passed through the hole in the terminal and is looped
over the free end of the other wire and both ends
wrapped around the shank. 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 aluminum
alloy. For safety cable diameter of safety wire size and
material, refer to table 7-8.
b. Care should be exercised
when safety wiring,
particularly where corrosion will present
a problem, because smaller wire sizes tend to crack
when twisted.
