# SDR UALA2011031601250

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 15, 2011
- Submitted: April 4, 2011
- Operation: Air carrier
- Aircraft: [N216UA](https://openairdocs.org/aircraft/N216UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30549
- Aircraft time: 43,907 hours, 5,591 cycles
- Engine: Pwa PW40903
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Audio Panel
- Part number: 570111
- Part serial: 173
- Condition: Faulty
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011031601250

## Discrepancy

CAPT'S O2 MASK WILL NOT TRANSMIT.  TROUBLESHOOTING REPLACED AUDIO MANAGEMENT UNIT PER MM, NO FIX.  RE-INSTALLED ORIGINAL UNIT.  RANG OUT WIRES FROM DM23009 TO DM23008AA TO S23001 & TO CAPT PTT ON GLARESHIELD. RANG OUT WIRES FROM AMU TO B23080, M23457 AND TO C23627, FOUND NO FAULTS. TRIED NEW PA-CI CONTROLLER, NO HELP. CLEANED ALL CONNECTORS. O2 MASK OP CHECKED NORMAL.

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