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landing gear retraction cables (conduits) replacement Single (PA24) and
Twin Comanche (PA30 & 39).
main landing gear systems on Piper Comanche and Twin Comanche aircraft are operated by two heavy duty push
/ pull cable assemblies which transfer the motion of the landing gear
actuator to each main landing gear. Extensive damage to the
bottom of the aircraft fuselage, prop(s) and engine(s) is possible
should the gear retraction cables fail. Failure
of one conduit can cause extensive damage to corresponding wing, flap, and
aileron of the main gear. Seizing of one
cable will prevent operation of the other two landing gear due to the synchronization
of the retraction cables and nose gear actuating tube .
one retraction cable seize, the emergency landing gear extension
system will fail.
are no non-destructive methods to fully inspect the condition of the cables
for wearing, fraying, and separation.
The cables can be checked for drag and freedom of movement,
but this will not alert the mechanic to excessive wear and fraying
inside the cable assemblies. Corrosion is often the main culprit
in failure of the cables. Replacement
of the retracting cables with new assemblies is necessary in order to
prevent the failure of the original cables.
The cables cost
almost $800 for the pair and require about 18 hours of labor to install
and rig. Installation of new rod end bearings often adds another $100.
the retraction cables are removed for replacement, it is a good time to address loose / working bottom wing
rivets in the inboard section of the wings. Access to the spar
rivets is restricted due to cable anchor
brackets securing the outboard ends of the cables.
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