# SDR CALA2011042700315

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2011
- Submitted: April 27, 2011
- Operation: Air carrier
- Aircraft: [N76504](https://openairdocs.org/aircraft/N76504), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31604
- Aircraft time: 15,681 hours, 5,416 cycles
- System (JASC): [2920 · Hydraulic System, Auxiliary](https://openairdocs.org/jasc/2920)
- Part: Module
- Part number: 654468118
- Part serial: A0026315
- Condition: Malfunctioned
- Location: Hydraulic Sys
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2011042700315

## Discrepancy

STBY RUDDER FAILS TO OPERATE PUMP COMES ON WITH A, B AND ALT FLAP SWITCHES RUDDER FAILS TO MOVE EITHER RIGHT OR LEFT TROUBLESHOT PER FIM FOUND STBY HYD SYSTEM MODULE INOP.  REMOVED AND REPLACED HYD MODULE PER 29 21-51-400-801 OPS CHECK GOOD LEAK CHECKS GOOD, RUDDER OPS GOOD.  ROTABLE PARTS CHANGE WAS INDICATED - TT # 1426738  SN OFF 06315 IPC REFERENCE 29-21-51-400-801 PACKAGE, HYD, S  OFF 29-2921-9-0003 6315 ON 29-2921-9-0003 3474 (NOTE - THE PROBLEM WAS FOUND DURING THE PRE-FLIGHT TEST ACCOMPLISHED BY THE FLIGHT TEST CREW).

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