# SDR 9JLA2022122939632

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2022
- Submitted: December 29, 2022
- Operation: Air carrier
- Aircraft: [N946WT](https://openairdocs.org/aircraft/N946WT), registered now
- Make and model: Raythn HAWKER800XP
- Aircraft serial: 258347
- Aircraft time: 11,094 hours, 7,360 cycles
- System (JASC): [2340 · Interphone/Passenger Announcement (PA) System](https://openairdocs.org/jasc/2340)
- Part: Rmu
- Part number: 7013270973
- Part serial: 17059563
- Condition: Defective
- Location: Nr 2
- Stage of operation: CR
- How discovered: O
- Nature of condition: S
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2022122939632

## Discrepancy

THE FLIGHT CREW REPORTED THAT THE CO-PILOTS INTERPHONE WAS INOP, CONTINUOUS STATIC WAS EMITTED FROM SPEAKERS AND CO-PILOTS OXYGEN MASK MICROPHONE WAS INOP DURING FLIGHT. THE MAINTENANCE PROVIDER TROUBLESHOT AND DETERMINED THAT THE NR 2 RADIO MANAGEMENT UNIT (RMU) WAS DEFECTIVE. THE RMU WAS REMOVED, AND A REPAIRED UNIT WAS INSTALLED. OPS CHECKS WERE SATISFACTORY, AND THE AIRCRAFT WAS RETURNED TO SERVICE.

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