What was found
TWO OIL JOURNALS IN CRANKCASE CLOGGED CAUSING TWO PISTONS TO FREEZE AND FAIL. ON LEFT SIDE OF CRANKCASE THE PISTON BROKE THROUGH CAUSING A FIST SIZE HOLE ON THE RIGHT SIDE OF THE PISTON BROKE THROUGH CAUSING A SILVER DOLLAR SIZE HOLE.
- Difficulty date
- December 16, 1997
- Submitted
- March 26, 2000
- Operation
- General aviation
- Aircraft
- N707DM
- Make and model
- Cessna 421B
- Aircraft serial
- 421B0145
- Engine
- Cont GTSIO520H
- System (JASC)
- 8520 · Reciprocating Engine Power Section
- Part
- Journal
- Condition
- Clogged
- Location
- Crankcase
- Stage of operation
- IN
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.