Service difficulty report · Magneto · Mooney M20C

Difficulty date
October 30, 2001
Submitted
December 4, 2001
Operation
General aviation
Make and model
Mooney M20C
Engine
Lyc O360A1D
Propeller
Mcauly 2D34C53
Part
Magneto
Part number
S4LN200
Condition
Faulty
Location
Magneto/Distribu
Component
Magneto/Distribu · Lyc · O360A1D
Stage of operation
IN
Nature of condition
O, E, R
Precautionary procedure
K

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

What was found

(AUS) MAGNETOS INTERMITTENT IN OP. INSP FOU NDFOLLOWING FAULTS ON BOTH UNITS:-1. CAPACITORS FOUND TO LEAKING ELECT.LY.2. SPUR GEAR FOUND TO BE OF NYLON TYPE WHICH HAS BEEN OBSOLETE FOR MANY YRS&REQD AS PER BENDIX MASTER MANUAL TO BE REPL. 3. DISTRIBUTOR BLOCK CONTAMINATED WITH FOREIGN MATERIAL &CRACKS WERE FOUND RADIATING OUT FROM THE ELECTRODES& THERE EVIDENCE OF TRACKING ALONG THESE CRACKS4. INTERNAL TIMING FOUND TO BE SET AT 6 DEGS MOST LIKELY DUE TO CAM FOLLOWER WEAR ON CONTACTS AS CONTACT GAPAT 0.1778MM (0.007IN).THESE VALUES COMPARED TOACCEPTABLE LIMITS OF 10 DEGS +/-2 DEGS&CONTACT GAPOF APPROX 0.4064MM (0. 016IN) SUGGESTS THAT THESE MAGNETOS HAVE NOT BEEN REMVD FOR SOME TIME.01115830-

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