Service difficulty report · Limit Switch · Piper PA44180

Difficulty date
May 22, 2013
Submitted
September 14, 2015
Operation
General aviation
Make and model
Piper PA44180
Aircraft time
7,864 hours
Part
Limit Switch
Part number
86409002
Condition
Damaged
Location
Nlg
Stage of operation
AP
How discovered
O
Nature of condition
J
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) INSPECTION REVEALED THAT THE NOSE GEAR DOWN LIMIT SWITCH TAB, WAS BENT AND WHEN THE HYDRAULIC CYLINDER LOCKED THE NOSE GEAR DOWN THE TAB WOULD SPRING OUT OF POSITION AND SIT ON TOP OF THE STRIKE BLOCK. DURING FREE FALL IT WOULD STAY IN ITS PLACE AND FUNCTION PROPERLY. THIS WAS SIMULATED ON THE GROUND SEVERAL TIMES. UPON REPLACEMENT OF THE SWITCH AND TAB WITH A NEW UNIT, IT WAS NOTED THAT THE OLD SWITCH REQUIRED MORE TRAVEL TO ACTIVATE, ONCE THE NEW SWITCH WAS INSTALLED AND ADJUSTED, SYSTEM NO LONGER FAILED. NOTICE THE BENT TAB ON THE OLD SWITCH, NOT SURE IF IT WAS CAUSED BY THE BLOCK DURING CYCLING OF THE GEAR AFTER IT FAILED THE FIRST TIME.

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