# SDR UALA2012042702516

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2012
- Submitted: May 25, 2012
- Operation: Air carrier
- Aircraft: [N798UA](https://openairdocs.org/aircraft/N798UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26928
- Aircraft time: 62,984 hours, 9,073 cycles
- Engine: Pwa PW40903
- System (JASC): [2312 · VHF Communications System](https://openairdocs.org/jasc/2312)
- Part: Module
- Part number: 4075450903
- Part serial: 97100843
- Condition: Failed
- Location: Vhf Radio
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012042702516

## Discrepancy

CENTER VHF RADIO WILL NOT GO TO DATA MODE.  RIGHT VHF WORKS OK IN DATA.  T-S REF FIM 23-27 TASK 80 6, REPLACED LEFT AMIS CPM-COMM MODULE M001 (M31101) & GROUND TEST LEFT AMIS, OP TESTED, LEFT DCMF -MODEM RESET PASSED. AND NO MORE MESSAGES.

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