# SDR UALA2013040102085

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2013
- Submitted: May 9, 2013
- Operation: Air carrier
- Aircraft: N598UA
- Make and model: Boeing 757222
- Aircraft serial: 28751
- Aircraft time: 55,546 hours, 15,561 cycles
- Engine: Pwa PW2037
- System (JASC): [2425 · AC Indicating System](https://openairdocs.org/jasc/2425)
- Part: Controller
- Part number: 520854
- Part serial: 15
- Condition: Failed
- Location: Cockpit
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2013040102085

## Discrepancy

HMG FAILED ACK OPS CK.  REPLACED HMG CONTROLLER.

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