PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
03/27/08
II - HANDLING AND SERVICING
1B9
2-7. THREADED FASTENER INSTALLATION
(PIR-PPS20015-1, Rev. S.)
a.
Fastener Lengths
Fastener lengths must be long enough to prevent bearing loads on threads. The complete chamfer or
end radius of the fastener or screw must extend through the nut.
The specified fastener grip length can be varied by one size (longer or shorter) to meet requirements
stated above. Where needed, use a maximum of two standard filler washers (spacers) under the nut
to adjust for fastener length or alignment of cotter key hole. Where nutplates are used, adjust for
protruding head fastener length by using up to a maximum of two standard filler washers under the
fastener head.
b.
Washer Usage
Add a maximum of two NAS1149 washers (of the correct diameter, material and finish that
matches the fastener being installed) under fastener heads or nuts to correct for variations in
material thickness within the tolerances permitted.
c.
Self-locking Fasteners
The use of self-locking nuts, fasteners and screws, including fasteners with non-metallic inserts is
subject to the following limitations:
1.
Fasteners incorporating self-locking devices must not be re-used if they can be run up using
less than the required minimum torque values specified or as shown in Table II-III. They may
be reused, if hand tools are required to run them up, providing there is no obvious damage to
the self-locking device prior to installation.
2.
Fasteners 5/16 inch diameter and over with cotter pin holes may be used with self-locking
nuts. Nuts with non-metallic locking devices may be used in this application only if the
fasteners are free from burrs around the cotter pin holes.
3.
Self-locking nuts must not be used at joints which subject either the nut or the fastener to
rotation.
4.
Self-locking fasteners shall never be tapped or rethreaded. Nuts, fasteners and screws with
damaged threads or rough ends shall not be used, or rethreaded.
d.
Torque
See Torque Wrenches and Torque Requirements, below.
Figure 2-3a. Torque Wrench Formula
Summary of Contents for Cherokee LANCE
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