# SDR SWAA2023081489219

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 14, 2023
- Submitted: August 14, 2023
- Operation: Air carrier
- Aircraft: [N465WN](https://openairdocs.org/aircraft/N465WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33829
- Aircraft time: 64,053 hours, 38,319 cycles
- System (JASC): [2911 · Hydraulic Power Accumulator, Main](https://openairdocs.org/jasc/2911)
- Part: Limiter
- Part number: UNKNOWN
- Condition: Cracked
- Location: Zone 100
- Stage of operation: CL
- How discovered: 9
- Nature of condition: K
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2023081489219

## Discrepancy

LOSS OF HYD B ON DEP. RAN CHECKLIST; TURN OFF B-PUMP IN UNDER A MIN. QTY WAS ZERO<[01] FOUND LEAK ON SYS B HYD FLOW LIMITING VALVE. UPON REMOVAL; FOUND UNION ADAPTER CRACKED BETWEEN THREADS CAUSING ALL SYSTEM B HYD FLUID TO DRAIN. REMOVED AND REPLACED SYS B EMDP FILTER TO INSPECT FOR PARTICLES REF AMM 29-11-41. NO FINDINGS.;[02] REMOVED AND REPLACED #2 ENG CASE DRAIN FILTER (TO INSPECT FOR PARTICLES) PER AMM 29-11-51. FILTER WAS CLEAN; NO PARTICLES.;[03] REMOVED AND REPLACED TRAILING EDGE FLAP FLOW LIMITER IAW AMM 27-51-67. OPS TEST AND LEAK TEST GOOD AT THIS TIME.

---
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.