# SDR CALA2013122393889

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2013
- Submitted: December 24, 2013
- Operation: Air carrier
- Aircraft: N174UA
- Make and model: Boeing 747422
- Aircraft serial: 24381
- Aircraft time: 93,163 hours, 10,344 cycles
- Engine: Pwa PW4056
- System (JASC): [2350 · Audio Integrating System](https://openairdocs.org/jasc/2350)
- Part: Microphone
- 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/CALA2013122393889

## Discrepancy

BOOM MICROPHONE OPERATION IS UNSATISFACTORY AT FIRST OBSERVER`S STATION.  MINITEL LOCATED BEHIND CAPTAIN'S SEAT.  REPLACED BOOM MIC.

---
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.