SDR 99ZZZX942

Service difficulty report · Filter · Cessna 172M

Difficulty date
December 4, 1998
Submitted
March 26, 2000
Operation
General aviation
Aircraft
N1854V
Make and model
Cessna 172M
Aircraft serial
17263771
Engine
Lyc O320E2D
Part
Filter
Condition
Shorted
Location
Alternator
Component
Ford
Stage of operation
NR
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

DURING FLIGHT, THE CONDENSER BROKE OFF THE BACK OF THE ALTERNATOR AND SHORTED OUT BETWEEN POWER (A+) AND THE FIELD WIRE (F). THIS CAUSED THE ALTERNATOR TO GO TO FULL OUTPUT. THE PILOT THEN SHUT OFF THE MASTER WHICH SUBMITTER BELIEVED ALLOWED THE ALTERNATOR TO PRODUCE UNREGULATED HIGH VOLTAGE WHICH DAMAGED ELECTRICAL AND AVIONICS COMPONENTS. TERMINAL BOOTS, MS 29171-15, MAY HAVE HELPED PREVENT THIS FROM HAPPENING.

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