Inspection Of Nose Gear; Cleaning Of Nose Gear; Repair Of Nose Gear - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Nose Gear and Doors (continued)
7. Inspection of Nose Gear
(a) Inspect bolts, bearings, bushings, and all ball joints for excessive wear, corrosion, and damage.
(b) Inspect the gear housing, drag links, idler link, uplock cable, rods, and attachment plates for
cracks, bends, or misalignment.
(c) Inspect the down lock spring as follows:
(1.) Check for excess wear or corrosion, especially around the lock portion of the spring. The
spring must return to complete compression. A spring must be rejected if wear or
corrosion exceeds one-quarter the diameter of the spring. Clean away all corrosion and
repaint the springs.
(2.) Check the right and left gear door actuator springs for load tensions below the minimum
allowable tolerances. The minimum tension for the actuator springs is 10 pounds at 3 inch
extension. If one spring is rejected, replace both springs.
(3.) Check the downlock spring at the idler link for load tension. The minimum tension is 20.5
pounds at 7.312 inches extension and 47 pounds at 11.312 inches extension.
(4.) Check the uplock spring at the uplock hook for load tension. The minimum tension is 4
pounds. This check is performed by fastening a fish type scale to the hook and spring.
Pull steadily against the hook and spring to get a reading.
(d) Inspect the uplock hook for wear and oversized bearing surfaces.
(e) Inspect the uplock roller for free movement and minimum wobble.
(f) Inspect both uplock cable sliding surfaces for corrosion, free movement, and lubrication.
(g) Check the general condition of limit switches and wiring for fraying, poor connections, or
conditions which could lead to failures.
(h) Attach the upper and lower drag links and check, when stop surfaces touch, that linkage is
0.063 to 0.156 inch through center. Should this distance exceed the required through-center
travel and bolt and bushings are tight, replace one or all drag links.
(i) Inspect shimmy dampener for security, damage, corrosion, and leaks.
8. Cleaning of Nose Gear
(a) Clean all parts with a suitable cleaning solvent.
9. Repair of Nose Gear
NOTE: The shimmy dampener requires no repair other than routine inspection. In case of
damage or malfunction, the dampener must be replaced, not repaired.
Repair to the landing gear is limited to reconditioning of parts, such as replacing bearings and
bushings, smoothing out minor nicks and scratches, repainting of areas where paint has chipped
or peeled, and replacing of parts.
EFFECTIVITY:
040-999
Jan 10/90