# SDR CALA2022123003523

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 30, 2022
- Submitted: December 30, 2022
- Operation: Air carrier
- Aircraft: [N13716](https://openairdocs.org/aircraft/N13716), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28787
- Aircraft time: 75,100 hours, 26,891 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Check Valve
- Condition: Leaking
- Location: Hyd System A
- Stage of operation: NR
- How discovered: O
- Nature of condition: K
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2022123003523

## Discrepancy

CAPT ADVISED LOSS OF SYS "A'' HYD QTY. (U147655) LOCKED L/P UNLOCKED FOR UPDATE LOG PAGE LOCKED AFTER MX UPDATE VERBALLY NOTIFIED BY FLIGHT CREW HYD PAGE DISLAYED 20% HYD QTY IN FLIGHT , THEREAFTER  HYD SIX PACK  FLASHED HEARD NOISE AND VIBRATION , BLOCKED ON THE GATE HYD PAGE DISPLAYED 44% RF . APPEARS EVIDENCE IN WHEEL WELL AREA OF LEAKS . T/S REQUIRED. UNLOCKED FOR SIGNOFF DURING #1 ENG RUNS NOTICED HYD FLUID COMING FROM  HYD SYS A MODULAR PACKAGE ASSY HYD PRESSURE SYSTEM CHECK VALVE, REPLACED CHECK VALVE ORING RAN #1 MOTOR OPS CHECKS GOOD REF AMM 29-11-71. PICTURES

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