Service difficulty report · Nut · Cessna 421B

Difficulty date
August 30, 2001
Submitted
October 24, 2001
Operation
General aviation
Aircraft
N781SL
Make and model
Cessna 421B
Aircraft serial
421B0343
Engine
Cont GTSIO520F
Part
Nut
Part number
AN310S
Condition
Failed
Location
Rt Mlg
Part time
149 hours
Stage of operation
TX
How discovered
O
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

AIRCRAFT WAS TAXING FROM THE MAIN RUNWAY TO THE GATE, PILOT FELT AND HEARD BUMPING NOISE UPON MAKING A RIGHT TURN. AS HE WAS MAKING RIGHT TURN ONTO RAMP TORQUE LINKS SEPARATED CAUSING THE RIGHT WHEEL AND PISTON ASSEMBLY TO ROTATE ABOUT 135 DEGREES, CAUSING DAMAGE TO THE TO THE OB GEAR DOOR. THE NUT STRIPPED ITS THREADS, SHEARED THE COTTER KEY AND DEPARTED THE AIRCRAFT. BOLT REMAINED IN UPPER TORQUE LINK. NEW MLG SCISSORS WASHER REPLACEMENT KIT WAS INSTALLED, KIT DOES NOT INCLUDE A NEW NUT AND SUGGEST USING OLD NUT. NEW NUT WAS USED. THE LEFT GEAR BOLT WAS INSPECTED AND FOUND NUT WAS WOBBLY ON BOLT THREADS. NEW KITS AND NUT WERE INSTALLED ON BOTH SIDES.

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