# SDR UALA2011082204476

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 20, 2011
- Submitted: September 16, 2011
- Operation: Air carrier
- Aircraft: [N647UA](https://openairdocs.org/aircraft/N647UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25284
- Aircraft time: 82,623 hours, 13,342 cycles
- Engine: Pwa PW4060
- System (JASC): [3150 · Central Warning](https://openairdocs.org/jasc/3150)
- Part: Circuit Card
- Part number: 285T025921
- Part serial: 104
- Condition: Faulty
- Location: Warning System
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011082204476

## Discrepancy

WHEN STANDBY PWR SWITCH SELECTED TO OFF POSITION THE CONFIG WARNING SOUNDS AND THE MASTER WARNING LT ILLUMINATES.  WHEN STBY PWR BUS DEPOWERED OR WEU B CB P11 B18 PULLED MASTER WARNING LTS ILLUMINATE AND AURAL WARNING SOUNDS.  NO EICAS WARNING MSG IS PRESENT WHEN AURAL WARNING AND LTS ILLUMINATED, REQUIRES FURTHER TROUBLESHOOTING (PARTIAL).  T/S TO CARD M620 TO CONFIG WARNING MODULE IN P51.  REPLACED CARD PER MM.  ALL INDICATIONS & OPS NORMAL.  NO AURAL WARNING WHEN STBY PWR SWITCHED OFF.  CARD IS AA 7 DAY NON-POOL LOAN. PAPERWORK IN LOG.  CONTAINER IN LOB.

---
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.