What was found
CRACKED CRANKCASE AT NR 7 STUD, BETWEEN CYLINDERS NR 1 AND NR 3. CRACK IS ON CRITICAL AREA AND EXCEEDS THE MAX ALLOWED IAW SBM 90-17. PROBABLE CAUSE: OVERTORQUED NUT OR DEFECTIVE CRANKCASE. REPORTED TO MFG.
- Difficulty date
- October 6, 2003
- Submitted
- October 22, 2003
- Operation
- Air carrier
- Aircraft
- N148MA
- Make and model
- Cessna 421C
- Aircraft serial
- 421C0078
- Engine
- Cont GTSIO520*
- System (JASC)
- 8520 · Reciprocating Engine Power Section
- Part
- Crankcase
- Condition
- Cracked
- 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.