# SDR AMWA21

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2003
- Submitted: September 5, 2003
- Operation: Air carrier
- Aircraft: N139ZV
- Make and model: Beech 1900D
- Registry model: [Beech 1900D](https://openairdocs.org/model/beech-1900d) (OpenAirDocs)
- Aircraft serial: UE139
- Aircraft time: 157 hours, 17,786 cycles
- System (JASC): [5312 · Fuselage Main, Bulkhead](https://openairdocs.org/jasc/5312)
- Part: Bulkhead
- Part number: 1144100266
- Condition: Cracked
- Location: Fuselage
- 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/AMWA21

## Discrepancy

WHILE TROUBLESHOOTING A PRESSURIZATION DISCREPANCY USING A PRESSURE CART, AIR FLOW WAS NOTED COMING FROM UNDER THE RIGHT AVIONICS SHELF.  FURTHER INVESTIGATION REVEALED A CRESENT SHAPED CRACK IN THE FWD PRESSURE BULKHEAD AT FS 84 BELOW THE SHELF.  THE CRACK RUNS LATERALY 4 INCHES, ON RT LOWER WEB, UNDERNEATH STIFFENER P/N 114-410026-55.

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