What was found
ROCKER SHAFT RETAINER BROKE LETTING 1/3 OF RETAINER TO DROB TO BOTTOM OF ROCKER BOX COVER WHERE IT LODGED BETWEEN END OF ROCKER ARM. PUNCHED HOLE IN COVER - LETTING OIL TO ESCAPE. PROB CAUSE: CRACKED AT ASSEMBLY.
- Difficulty date
- September 10, 2011
- Submitted
- October 5, 2011
- Operation
- Air carrier
- Aircraft
- N21WU
- Make and model
- Cessna 421C
- Aircraft serial
- 421C0650
- Aircraft time
- 8,357 hours
- Engine
- Cont GTSIO520L
- Engine time
- 281 hours
- Propeller
- Mcauly 3FF32C501
- System (JASC)
- 8530 · Reciprocating Engine Cylinder Section
- Part
- Retainer
- Part number
- 646032
- Condition
- Broken
- Location
- Rt Engine
- Part time
- 280 hours
- Component
- Cylinder · Eci
- Component part number
- 654966
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- K, B
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.