Inspection 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)
6. Inspection of Main Landing Gear
(a) Inspect bolts, bearings, bushings, and ball joints for excess wear, corrosion, and damage.
(b) Inspect the gear housing, side brace links, idler links, rods, and attachment plates for cracks,
bends, or misalignment.
(c) Inspect lock hook for wear and oversized bearing surfaces.
(d) Inspect the lock hook springs for the following:
(1.) Excess wear or corrosion especially around the hook portion of springs. A spring must be
rejected if wear or corrosion exceeds one-quarter the diameter of spring.
(2.) Check lock hook springs for load tensions below the minimum allowable tolerances. The
minimum tension for up lock hook springs is 4 pounds and the down lock hook springs 7
pounds. Perform these checks by fastening a fish type scale to the particular hook and
spring and pulling against the hook and spring for a reading on the scale.
(e) Inspect up lock roller for free movement and minimum wobble.
(f) Inspection both up lock and down lock rods sliding surfaces for corrosion, free movement, and
lubrication.
(g) Inspect general condition of limit switches and wiring for fraying, poor connections, or
conditions leading to failures.
(h) Attach upper and lower drag links. Ensure that when stop surfaces of the two links contact,
linkage is 0.219 to 0.281 inch through center (refer to 32-10-00 Figure 401). If this distance
exceeds the required through center travel, and if all bolts and bushings are tight, replace one
or both side brace links.
(i) Inspect landing gear trunnion bolts to ensure proper length bolts are installed. (A minimum of
one thread must be showing beyond the top of the nuts.)
(j). Inspect main landing gear forward side braces as follows:
(1.) Remove paint (refer to 32-10-00 Figure 601) on both forward side braces.
Approximate Area of Cracks.
Paint To Be Removed For Inspection.
Main Gear Forward Side Brace
Figure 601
NOTE: If alodine is undamaged, repainting is not necessary between repetitive 50 hour
inspection intervals.
(2.) Inspect area for cracks using dye penetrant or Zyglo procedures. Pay particular attention
to top surface of affected parts.
(3.) If cracks are found, replace affected part(s) immediately prior to any further flights.
(4.) Complete appropriate logbook entry.
EFFECTIVITY:
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32-10-00
Jan 10/90