Service difficulty report · Wire Harness · Mooney M20R

Difficulty date
August 29, 2005
Submitted
September 15, 2005
Operation
General aviation
Aircraft
N366GJ
Make and model
Mooney M20R
Aircraft serial
290366
Engine
Cont IO550*
Part
Wire Harness
Condition
Burned
Location
Control Panel
Part time
170 hours
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

WHEN TROUBLESHOOTING, THE SQUAWK (RECOGNITION LIGHTS ON ALL THE TIME) WE FOUND CARRED WIRE INSULATION IN THE WIRE HARNESS FEEDING THE OVERHEAD BANK OF SWITCHES THAT CONTROL THE SHIPS EXTERIOR LIGHTING. WE TRACED THE CHARRED INSULATION TO AN OVERHEATED CONDITION IN THE RECOGNITION LIGHT CIRCUIT. A SUBSTANDARD CRIMP ON A WIRE TERMINAL WAS REPAIRED AND THE OVERHEATED CONDITION WAS NOT NOTED AFTER THAT. THE (LIGHTS ON ALL THE TIME) SQUAWK WAS DUE TO THE CHARRED INSULATION ALLOWING POWER DIRECTLY TO THE RECOG LIGHTS, CIRCUMVENTING THE SWITCH. (K)

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