# SDR CALA2013092591426

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 24, 2013
- Submitted: September 27, 2013
- Operation: Air carrier
- Aircraft: N405UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 452
- Aircraft time: 67,244 hours, 24,950 cycles
- Engine: Iae V2527A5
- System (JASC): [2350 · Audio Integrating System](https://openairdocs.org/jasc/2350)
- Part: Amu
- Part number: ACP2788AB04
- Part serial: 420
- Condition: Faulty
- Location: Cockpit
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013092591426

## Discrepancy

CAPTAIN'S OXYGEN MASK MICROPHONE IS INOPERATIVE.  REPLACED CAPTAIN'S O2 MASK IAW AMM, NO HELP.  REPLACED CAPTAIN'S AUDIO PANEL IAW AMM, NO HELP.  REPLACED AUDIO MANAGEMENT UNIT PN AMU2790CB04 - SERIAL 131.  OPERATIONS CHECKED GOOD.

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