SDR 96ZZZX176

Service difficulty report · Coil · Cessna 172M

Difficulty date
October 31, 1995
Submitted
March 26, 2000
Operation
General aviation
Aircraft
N19992
Make and model
Cessna 172M
Aircraft serial
17260917
Engine
Lyc O320E2D
Part
Coil
Part number
M3525
Condition
Defective
Location
Eng Rt Mag
Part time
582 hours
Component
Slick · 4270
Stage of operation
IN
Nature of condition
Y
Precautionary procedure
K

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

What was found

DURING RUN-UP, RT MAG DROP WAS EXCESSIVE OR ENGINE WOULD STOP. MAGNETO WAS DISASSEMBLED AND POINTS AND CONDENSOR REPLACED DUE TO WORN CONDITION. COIL WAS TESTED AND THE SECONDARY WAS FOUND TO HAVE APPROXIMATELY 5 MILLION OHMS RESISTANCE. THE SPEC IS 13,000-20,500 OHMS. UPON REMOVAL OF COIL, ALSO NOTED LAMINATIONS HAD STARTED TO SEPARATE. SUBMITTER RECOMMENDS ADHERENCE TO SLICK MANUAL WHICH REQUIRED 500-HOUR INSPECTIONS. THERE WAS NO PREVIOUS WORK ON MAGS NOTED IN LOG BOOK.

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