# SDR Z5FA2013021351401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 13, 2013
- Submitted: February 15, 2013
- Operation: Air carrier
- Aircraft: [N514CS](https://openairdocs.org/aircraft/N514CS), registered now
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605328
- Aircraft time: 8,910 hours, 6,430 cycles
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Rmu
- Part number: 7013270961
- Part serial: 12046532
- Condition: Defective
- Location: Nr 1 Radio
- Part time: 2,274 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/Z5FA2013021351401

## Discrepancy

WHILE ENROUTE, NR 2 RADIO DISPLAY UNIT FROZE AND CREW WAS UNABLE TO CHANGE COMM 1 OR COMM 2 FREQUENCIES USING RDU 1 OR RDU 2 AND STANDBY OR FMS TUNE BUTTON. CREW WAS ABLE TO STAY IN CONTACT WITH ATC USING 121.5.  CREW ELECTED TO DIVERT.  ACFT LANDED UNEVENTFULLY.  MX FOUND NR 1 RADIO MANAGEMENT UNIT TO BE CAUSE OF DISCREPANCY.  NR 1 RMU WAS REPLACED.  OPERATIONALLY CHECKED SATISFACTORY AND ACFT WAS RETURNED TO SERVICE.

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