# SDR 2006FA0001153

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2006
- Submitted: December 8, 2006
- Operation: General aviation
- Aircraft: [N3876C](https://openairdocs.org/aircraft/N3876C), registered now
- Make and model: Beech B-60
- Registry model: [Beech B-60](https://openairdocs.org/model/beech-b-60) (OpenAirDocs)
- Aircraft serial: P513
- System (JASC): [5314 · Fuselage Main, Keel](https://openairdocs.org/jasc/5314)
- Part: Stiffener
- Part number: 6041002551
- Condition: Cracked
- Location: Fuselage
- Part time: 3,004 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/2006FA0001153

## Discrepancy

DURING ANNUAL INSPECTION, STIFFENER PART NUMBER 60-410025-51 LOCATED UNDER THE NOSE BAGGAGE FLOOR ON THE RIGHT SIDE AT STATION 67 BETWEEN THE MAIN AND STANDBY INVERTER WAS FOUND CRACKED AROUND THE HI-LOK FASTENER HOLES.  REMOVAL OF THE STIFFENER ALLOWED FURTHER INSPECTION OF THE KEEL PART NUMBER 60-410025-601, WHICH REVEALED CRACKS IN THE WEB WHICH WERE PREVIOUSLY OBSCURED BY THE INSTALLED STIFFENER.  THE MIRROR IMAGE STIFFENER PART NUMBER 60-410025-49 ON THE LEFT SIDE OF THE AIRCRAFT REVEALED SIMILAR CRACKS WITH NO DAMAGE TO THE KEEL.

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