# SDR UALA2013040402226

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 2013
- Submitted: April 10, 2013
- Operation: Air carrier
- Aircraft: N595UA
- Make and model: Boeing 757222
- Aircraft serial: 28748
- Aircraft time: 58,631 hours, 16,402 cycles
- Engine: Pwa PW2037
- System (JASC): [2397 · Communications System Wiring](https://openairdocs.org/jasc/2397)
- Part: Coupler
- Part number: 490S1
- Part serial: 12160
- Condition: Failed
- Location: Hf System
- Stage of operation: CR
- 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/UALA2013040402226

## Discrepancy

LEFT HF RADIO FAILED TO TUNE OR TRANSMIT IN FLIGHT.   GROUND TESTED LEFT HF RADIO, OP CHECKED OK.  RANG-OUT COAX CABLE FROM M241 AT COUPLER TO LEFT HF TRANSCEIVER M152 READ 1.23 OHMS.  JUMPED BETWEEN CENTER CONDUCTOR AND SHIELD.  REPLACED LEFT HF COUPLER PER AMM, OP CHECKED GOOD.

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