What was found
DURING ANNUAL INSPECTION, A CRACK EXTENDING ABOUT 2 INCHES EACH SIDE OF THE THREADED BOSS. THE BOSS HAD BEEN DRILLED AND TAPPED FOR A HELICOIL. THREADED BOSS IS FOR ATTACHING THE INTERCOOLER.
- Difficulty date
- March 14, 2000
- Submitted
- March 26, 2000
- Operation
- General aviation
- Aircraft
- N3121K
- Make and model
- Cessna 421
- Aircraft serial
- 42100102
- Engine
- Cont GTSIO520D
- System (JASC)
- 8520 · Reciprocating Engine Power Section
- Part
- Manifold
- Part number
- 633945
- Condition
- Cracked
- Location
- Engine
- 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.