What was found
FOUR NEW LW-12993 CYLINDERS HAVE CRACKS AT THE ROCKER BOX DRAIN FITTING BOSS. THESE CRACKS OCCUR AT A CASTING FLAW. THIS MAY BE CAUSED BY THE TAPERED THREAD OF THE MS-20823-6D ELBOW FITTING.
- Difficulty date
- June 18, 1996
- Submitted
- March 26, 2000
- Operation
- General aviation
- Aircraft
- N201RP
- Make and model
- Mooney M20J
- Aircraft serial
- 240215
- Engine
- Lyc IO360A3B6
- System (JASC)
- 8530 · Reciprocating Engine Cylinder Section
- Part
- Cylinder
- Part number
- LW12993
- Condition
- Cracked
- Location
- Rocker Box Drain
- Stage of operation
- IN
- Nature of condition
- W
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.