# SDR CALA2016050900292

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2016
- Submitted: May 9, 2016
- Operation: Air carrier
- Aircraft: [N37408](https://openairdocs.org/aircraft/N37408), registered now
- Make and model: Boeing 737924
- Aircraft serial: 30125
- Aircraft time: 44,960 hours, 18,209 cycles
- System (JASC): [2913 · Hydraulic Pump (Electric/Engine), Main](https://openairdocs.org/jasc/2913)
- Part: Pump
- Part number: 849589
- Part serial: 0970
- Condition: Unserviceable
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2016050900292

## Discrepancy

FL 350 INTERMITTENT LOW PRESS ON NR 1 ENG HYD PUMP & MASTER CAUTION TO DROP TO ZERO.  GOOD PRESS 3000 PSI ON A SYS THROUGHOUT TOUCHDOWN.  QTY BOUNCED TO 16 AFTER LANDING.  FOUND ACOUSTIC FILTER HOUSING LEAKING FOR HYD A SYS.  R & R HYD A ACOUSTIC FILTER ASSEMBLY IAW AMM 29-11-27.  LEAK CHECKED GOOD.  DURING OPERATIONS CHECK FOUND NR 1 ENG HYD PUMP NOT PRODUCING ENOUGH PRESS.  R & R NR 1 ENG HYD PUMP IAW AMM 29-11-11.  OPERATIONS & LEAK CHECKED GOOD.  EMER DECLARED.

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