Installation Of Main Landing Gear - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main Gear and Doors (continued)
3. Installation of Main Landing Gear (refer to 32-10-00 Figure 401)
CAUTION: WHEN ASSEMBLING ANY UNITS, LUBRICATE BEARINGS, BUSHINGS, AND
FRICTION SURFACE WITH PROPER LUBRICANT.
(a) Position attachment plates of landing gear housing and upper drag links and bolt in place.
(b) The up lock hook is installed as follows:
(1.) Place U end of the up lock spring over the back of the hook with loops toward the back.
(2.) Spread the spring and fit loops over bushing extending through hook.
(3.) Slide hook inboard through the bracket until the bracket hole aligns with the bolt hole in
hook.
(4.) Install pivot bolt and tighten so hook rotates freely without side play.
(c) Attach up lock cable and blowdown up lock rod with sliding ends attached to the hook and the
other end of their fittings.
(d) To install main gear housing assembly, position gear so attachment points on the housing align
with attachment plates. If needed, install spacer washers between attachments to allow a
minimum amount of end play. Tighten nut on each pivot bolt to a snug fit, allowing gear to
swing free and safety and install main landing gear bolt retainers (forward and aft).
(e) The upper and lower side brace link assembly is installed as follows:
(1.) Reinstall pivot shaft (forward upper side brace link) spar attachment fitting as follows:
(a.) Slide a washer over each bolt. Insert bolts through appropriate mounting hole in the
fitting.
(b.) With bolts in their fittings, install the required shims to correctly space fitting away
from the spar for proper positioning of the pivot shaft.
(c.) With shims on the bolts of the fitting, carefully insert fitting through access hole and
bolt the fitting to the spar.
(d.) After the four bolts are tightened, remove one bolt at a time and reinstall them so only
one thread is engaged in the spar rivnut. Pull on the bolt and check distance between
bearing surface of bolt head and the pivot shaft fitting (or surface of washer). The
allowable tolerance of the gap is 0.370 inch minimum to 0.385 inch maximum. One
additional 0.03125 (1/32) inch washer can be used under the bolt head to prevent the
unthreaded shank from bottoming in the rivnut. If the gap is not big enough, use the
next size AN-4-##A bolt (refer to 32-10-00 Figure 401). Reinstall each bolt and
torque to 70 inch-pounds.
(2.) Slide pivot shaft through attachment plate mounted to the wheel well and into the
attachment fitting on the spar. Secure pivot shaft at attachment fitting.
(3.) Check that the forward upper arm is installed on the link, install the link on the pivot shaft
and secure it with washers and nut.
(4.) The aft upper drag link is installed by sliding the link on aft attachment plate pivot bolt.
Tighten nut to allow link to swing free with no side play; safety the nut.
(5.) Position lower link between upper drag link ends, install the bolt assembly and tighten,
allowing the link to turn free with no side play.
(6.) Attach lower drag link to landing gear housing; secure and safety. Move gear in and out of
the down lock position several times to ensure no binding exists.
EFFECTIVITY:
040-999
PAGE 6
Jan
10/90
32-10-00