Piper Cherokee LANCE, Service Manual

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PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
II - HANDLING AND SERVICING 03/27/08
1B12
NOTE: When the fastener is stationary and the nut is torqued, use the lower side of the torque
range.
When the nut is stationary and the fastener is torqued, use the higher side of the torque
range. In this case, ensure one (1) washer is installed under the head as follows:
(a) If the subject chapter/section does not specify the use of a washer under the head,
install one (1) NAS1149 .032 thick washer under the head. If additional washers are
required under nut to adjust for grip length variation as described under Threaded
Fastener Installation above: reduce them .032 to allow for the additional .032 washer
now installed under head. Check to ensure threads are not bearing loads, due to the
added .032 washer thickness.
(b) All added washers are to be of the correct diameter, material and finish that matches
the fastener being installed.
7. Apply a smooth even pull when applying torque pressure. If chattering or a jerking motion
occurs during final torque, back off and re-torque.
8. When installing a castellated nut, start alignment with the cotter pin hole at minimum
recommended torque, and do not exceed maximum recommended torque. If the hole in the
fastener shank and the nut castellation do not align within this range, change washers and try
again. Do not exceed the maximum recommended torque. If self-locking castellated nuts are
used, include friction drag torque.
9. Unless otherwise specified in the subject chapter/section, when castellated nuts are used with a
cotter pin on moving joints, the nut shall not be torqued to Table II-III values. Nuts shall be
tightened to remove looseness in the joint and then the cotter pin installed.
c. Gap Conditions Between Parts Attached with Threaded Fasteners
If a gap condition exists between mating parts where a threaded fastener is to be installed, install
fasteners and associated hardware per subject chapter/section or to buildup noted during removal.
Then, torque to a value 10% of the final torque required plus the friction drag torque.
For example, if Table II-III, Sheet 2, torque is 190 in.-lbs. and the friction drag torque of the nut is
80 in.-lbs. (i.e. - Table II-III, Sheet 2, torque minus Table II-III, Sheet 1, torque), torque to a value
of:
Maximum Permissible
Gap Closing Torque
= (Table II-III, Sheet 1, torque x .10) + (Sheet 2 - Sheet 1) torque
Example: 3/8-24 (190 x .10) + (270-190) = 19 + 80 = 99 in.-lbs.
Accomplish this for all fasteners common to the gapped interface. If no gap exists after
accomplishing the above, finish torquing to final torque. If a gap remains consult your Piper
Dealer’s Service Advisor (DSA) for further assistance.
d. After the final torque, apply a slippage mark to the nut or bolt or screw head as applicable.
NOTE: For more details on torquing, refer to FAA AC 43.13-1, latest revision.