Piper PA-34-200T Seneca II, Service Manual

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PIPER SENECA II SERVICE MANUAL
VII - LANDING GEAR AND BRAKE SYSTEM 04/30/07
1K10
7-21. MAIN LANDING GEAR.
7-21a. INSPECTION.
a. General
NOTE: Disassemble as required.
1. Clean all parts with a suitable dry type cleaning solvent.
2. Inspect gear components for the following unfavorable conditions:
a Bolts, bearings and bushings for excessive wear, corrosion and damage.
b Gear housing, side brace links, torque links and attachment plates for cracks, bends or
misalignment.
c Downlock hook for excessive wear of the bearing surfaces.
3. Inspect the gear downlock spring for the following:
a Excessive wear or corrosion, especially around the hooked ends of the spring. A spring
should be rejected if wear or corrosion exceeds one-quarter the diameter of the spring.
Clean away all corrosion and repaint.
b Check the spring for load tensions below minimum allowable tolerance. The minimum
tension of the spring is 48 pounds pull at 7.9 inches. Measurement is taken from the inner
side of each hook.
4. Check the general condition of each limit switch and its actuator, and wiring for fraying, poor
connections or conditions that may lead to failures.
5. Check side brace link through center travel by attaching the upper and lower links, setting
them on a surface table, and ascertaining that when the stop surfaces of the two links touch,
linkage is not less than .145 nor more than .170 of an inch through center. Should the distance
exceed the required through center travel and bolt and bushings are tight, replace one or both
links.
6. With side brace links assembled and checked, ascertain that when stop surfaces of the two
links contact, the clearance between each downlock hook and the flat of the downlock pin is
not less than 0.010 of an inch. Should clearance be less than that required, the hook only may
be filed not to exceed a gap of more than 0.025 of an inch. The maximum allowable clearance
between each hook and the downlock pin that are service worn is 0.055 of an inch. Should
clearance be more than 0.055 of an inch, replace the pin, check clearance and then if still
beyond tolerance, replace hooks. The gap between each hook should be equal.