# SDR 2010FA0001149

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 1, 2010
- Submitted: November 2, 2010
- Operation: General aviation
- Aircraft: N1958G
- Make and model: Cessna 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Aircraft serial: 421B0857
- Engine: Cont GTSIO520H
- Engine time: 3,995 hours
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Boss
- Part number: 633400
- Condition: Cracked
- Location: Lt Engine
- Part time: 3,995 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2010FA0001149

## Discrepancy

DURING VISUAL INSP OF THE ENGINE DISCOVERED INTERCOOLER AFT MOUNTING BOSS TO BE CRACKED 3/4 OF THE WAY AROUND.

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