# SDR CALA2013102492362

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2013
- Submitted: October 25, 2013
- Operation: Air carrier
- Aircraft: [N121UA](https://openairdocs.org/aircraft/N121UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 29167
- Aircraft time: 60,344 hours, 7,001 cycles
- Engine: Pwa PW4056
- System (JASC): [2350 · Audio Integrating System](https://openairdocs.org/jasc/2350)
- Part: Microphone
- Condition: Defective
- 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/CALA2013102492362

## Discrepancy

BOOM MICROPHONE OPERATION IS UNSATISFACTORY AT CAPTAIN`S STATION.  SWITCHED TO SPARE MINITEL FOR CAPTAIN'S POSITION.  OPERATIONS CHECKED OKAY.  REPLENISHED SPARE.

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