# SDR ASAA2019092830845

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 28, 2019
- Submitted: September 30, 2019
- Operation: Air carrier
- Aircraft: [N513AS](https://openairdocs.org/aircraft/N513AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35192
- Aircraft time: 42,083 hours, 12,543 cycles
- System (JASC): [2913 · Hydraulic Pump (Electric/Engine), Main](https://openairdocs.org/jasc/2913)
- Part: Pump
- Part number: 66087
- Part serial: 660874004
- Condition: Overpressured
- Location: Nr 2 Engine
- Part time: 31,305 hours, 14,418 cycles
- Stage of operation: CR
- 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/ASAA2019092830845

## Discrepancy

HYDRAULIC SYSTEM B PRESSURE SLOWLY INCREASED FROM 3030 PSI TO 3480 PSI OVER A 3 HR. PERIOD AT CRUISE FL 370. GROUNDED - YES. REMOVED AND REPLACED #2 ENG HYD PUMP REF B737-800 AMM 29-11-11/401, HYD FILTERS B SYS PRESS MODULE REF AMM 29-11-71/401, RETURN FILTER REF AMM 29-11-61/401 AND EDP CASE DRAIN FILTER REF AMM 29-11-51/401. NO METAL WAS FOUND IN OLD FILTERS. #2 ENG DRIVEN PUMP TESTED GOOD AND NO LEAKS FOUND ON #2 DEP OR ON THE 3 HYD SYSTEM FILTERS CHANGED REF AMM 29-11-11-40-801-001.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.