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MODEL 182 & T182 SERIES SERVICE MANUAL
1-11.
USE OF LOCKING CLIPS.
5.
When loosening of threaded parts would not
a.
Safetying Turnbuckles. (See Figure 1-6.)
endanger safety of airplane or people.
1.
Prior to safetying, both threaded terminals
6.
When corrosion encouraged by gouging
shall be screwed an equal distance into turnbuckle
aluminum or magnesium alloys by edges of teeth on
body and shall be screwed in at least so far that not
tooth-locked washers would not cause malfunctioning
more than three threads of any terminal are exposed
of parts being fastened together.
outside body.
2.
After turnbuckle has been adjusted to its
1-13.
USE OF SELF-LOCKING NUTS.
locking position, with slot indicator groove on termi-
a.
Restrictions.
nals and slot indicator notch on body aligned, insert
1.
Self-locking nuts cannot be used under cer-
end of locking clip into terminal and body (refer to
tain conditions.
Figure 1-6) until U-curved end of locking clip is over
(a) Used, reworked, or reprocessed nuts
hole in center of body.
should not be installed for any application.
(a) Press locking clip into hold to its full ex-
(b) Do not use if at joints in control systems
tent.
for singular attach points.
(b) Curved end of locking clip will expand and
(c)
Do not use on externally threaded parts
latch in body slot.
that serve as an axle of rotation for another part
(c)
To check proper seating of locking clip,
where tensional (torque) loads can cause nut to loosen
attempt to remove pressed "U" end from body hole
and/or become separated. Examples are pulleys, lev-
with fingers only.
ers, linkages, and cam followers.
NOTE
NOTE
Do not use tool as locking clip could be dis-
Self-locking nuts can be used when threaded
torted.
parts are held by a positive locking device that
requires shearing or rupture before torsional
3.
Locking clips are for one time use only and
loads can act on threaded parts.
shall not be re-used.
4.
Both locking clips may be inserted in same
(d)
Do not use where a loose nut, bolt, or
hole of turnbuckle body or in opposite holes of
screw could fall or be drawn into an area that
turnbuckle body.
would impede or damage or otherwise distort opera-
tion.
1-12.
USE OF LOCKWASHERS.
(e)
Do not use to attach access panels and
a.
Lockwashers can be used only under the follow-
doors or to assemble components that are routinely
ing conditions.
disassembled or removed for access and servicing.
1.
When self-locking feature cannot be provided
(f)
In general, do not use self-locking nuts
in externally or internally threaded part.
where loss of bolt affects safety of flight.
2.
When a cotter pin cannot be used to prevent
2.
Bolts, studs, or screws, excluding Hi-Locks,
rotation of internal threads with respect to external
must extend through self-locking nut for a length
threads,
equivalent of two threaded pitches. This length
3.
When lockwire cannot be used to prevent
includes chamfer.
loosening of threaded parts.
3.
Self-locking nuts which are attached to struc-
4.
When fastening is not used for fabrication of
ture shall be attached in a positive manner to elimi-
primary structure.
nate possibility of their rotation or misalignment
when tightening is to be accomplished by rotating
bolts to structure, and permit replacement of nuts.
1-14
Revision 1
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