# SDR CALA2013102992496

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2013
- Submitted: November 1, 2013
- Operation: Air carrier
- Aircraft: [N197UA](https://openairdocs.org/aircraft/N197UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 26901
- Aircraft time: 65,985 hours, 7,690 cycles
- Engine: Pwa PW4056
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Circuit Card
- Part number: 285U0032202
- Part serial: 28
- Condition: Faulty
- Location: Hydraulic Sys
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013102992496

## Discrepancy

HYD CONTROL 4 EICAS ADVISORY MESSAGE WITH HYDIM 4 STATUS MESSAGE.  BOEING AHM PROGRAM HAS DETECTED FAULT MESSAGE 29184 HYDIM-4 FAIL OR HYDIM-4 OUTPUT BUS FAIL.  REPLACED CARD, REPLACED RELAY R7415 HYD PUMP CONT AUX AC ACP GND END RUN ON NR 1 & NR 4 ENG, CYCLED FLAPS THRU FULL CYC. NIL ADVISOR STS MSG GENERATED, IAW MM29-11 -42, OPERATIONS CHECKED GOOD.

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