Service difficulty report · Wire · Piper PA44180

Difficulty date
February 17, 2014
Submitted
February 17, 2014
Operation
General aviation
Aircraft
N440PA
Make and model
Piper PA44180
Aircraft serial
4496084
Aircraft time
8,324 hours
Engine
Lyc O360A1H6
Part
Wire
Condition
Broken
Location
Downlock Switch
Component
Downlock Switch · Eaton
Component part number
89291003
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

THE LT MLG DOWNLOCK SWITCH WAS FOUND BY A MAINTENANCE TECH TO HAVE 2 BROKEN WIRES. 1 WIRE WAS EASILY SEEN TO BE BROKEN, HOWEVER THE SECOND WIRE WAS BROKEN UNDER THE SWITCH ASSEMBLY'S SHINK WRAP, RENDERING THE DEFECT INVISIBLE UNLESS THE TECH TOOK OFF THE SHRINK WRAP. THE WIRES OF THIS SWITCH ARE ENCASED IN SHRINK WRAP FROM THE MOLEX CONNECTOR TO APPROX 1.5" FROM THE SWITCH BODY, WHICH APPEARS TO ENCOURAGE THE WIRES TO FLEX IMMEDIATELY OUTSIDE THE SWITCH BODY DURING THE MOVEMENT OF THE GEAR. THIS REPAIR STATION HAS SEEN AND REPORTED A NR OF SWITCH FAILURES THAT ARE SUBSTANTIALLY SIMILAR TO THE ONE NOTED IN THIS REPORT, SOMETIMES CAUSING INCORRECT GEAR INDICATIONS WHEN THE PILOTS ATTEMPT TO LAND.

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