# SDR 99ZZZX2948

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Engine: Pwa JT8D15A
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Bolt
- Part number: 772568QQ
- Condition: Mismanufactured
- Location: Compressor
- Stage of operation: NR
- Nature of condition: W, C
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX2948

## Discrepancy

PMA BOLT P/N 772568 QQ, REPLACEMENT FOR OEM BOLT P/N 772568, FAILED AFTER 7 HOURS AND 6 CYCLES IN SERVICE BOLT FRACTURED CAUSING HEAD TO BE INGESTED INTO THE N-2 COMPRESSOR DRIVE TURBINE WHERE EXTENSIVE DAMAGE WAS INFLICTED.  LABORATORY ANALYSIS HAVE REVEALED THE LACK OF NICKLE HAD CAUSED CADMIUM INBRITTLEMENT.  SUBMITTER RECOMMENDED REMOVING AND REPLACING ALL PMA BOLTS P/N 772568QQ FROM BATCH NR'S 30246 AND 30248 FROM SERVICE WITH LESS THAN 300 HOURS/CYCLES AT OPERATOR'S EARLIEST CONVENIENCE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.