Service difficulty report · Magneto

Difficulty date
January 10, 2020
Submitted
February 4, 2020
Operation
General aviation
Part
Magneto
Part number
4371
Part serial
19090601
Condition
Damaged
Location
Engine
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

THIS NEW MAGNETO IMPULSE COUPLING FAILED ON THE FIRST RUN OF THE MAGNETO. THE FAILURE CAUSED THE IMPULSE COUPLING PAWL TO DIG INTO THE HOUSING OF THE MAGNETO WHICH PREVENTED THE MAGNETO FROM ROTATING. THE SEIZING OF THE MAGNETO CAUSED THE MAGNETO DRIVE GEAR PN 61665 TO SHEAR A TOOTH. THE PROBLEM MOST LIKELY OCCURRED TO THE FAILURE OF AN IMPULSE COUPLING RIVET. ONE IMPULSE COUPLING RIVET FAILED AND THE IMPULSE COUPLING PAWL DUG INTO THE HOUSING. SLICK ISSUED SB2-19 FOR IMPULSE COUPLING RIVET INSPECTION. THIS MAGNETO`S SERIAL NUMBER IS NOT LISTED IN SB2-19.