Service difficulty report · Cable · Cessna 421A

Difficulty date
June 12, 2006
Submitted
June 28, 2006
Operation
General aviation
Aircraft
N99VK
Make and model
Cessna 421A
Aircraft serial
421A0091
Part
Cable
Part number
K3A2
Condition
Shorted
Location
Lt Starter
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

DURING STARTING OF LT ENGINE, SMOKE WAS OBSERVED COMING FROM THE LOUVERS ON TOP OF THE LT ENGINE. THE ENGINE WAS SHUTDOWN AND THE SMOKE SUBSIDED. INSP REVEALED THAT THE 2-GAUGE STARTER AND ALTERNATOR POWER CABLES WERE BURNED IN HALF NEAR THE TURBOCHARGER. FOURTEEN OTHER WIRES IN THE SAME BUNDLE WERE ALSO BURNED IN HALF OR SEVERELY HEAT DAMAGED. THE ELECTRICAL FIRE WAS A RESULT OF THE STARTER CABLE SHORTING TO GROUND ON THE TURBO SUPPORT BRACKET (PN 5155101-20). THE ELECTRICAL WIRE BUNDLE HAD BEEN RESTING ON THIS BRACKET FOR SOME TIME UNTIL THE WIRE INSULATION WAS CHAFFED THROUGH. INSP OF THE OTHER ENGINE REVEALED SIMILAR CHAFFING AND POSSIBLILITY OF A SHORT. (K)

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