# SDR CALA2026061517073

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2026
- Submitted: June 15, 2026
- Operation: Air carrier
- Aircraft: [N73291](https://openairdocs.org/aircraft/N73291), registered now
- Make and model: Boeing 737824
- Aircraft serial: 33454
- Aircraft time: 64,840 hours, 23,757 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Hydraulic Line
- Part number: 155012122014
- Condition: Broken
- Location: Zone 400
- Stage of operation: CL
- 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/CALA2026061517073

## Discrepancy

AIR RETURN.  A SYSTEM HYDRAULIC LOSS OF PRESSURE ON CLIMB.DEBRIEFED CREW.  ON CLIMB, HYDRAULIC A LOST PRESSURE.  CHECKED FOR HYDRAULIC LEAKS IN WHEEL WELLS ON GROUND, NO LEAKS NOTED. HYDRAULIC A RESERVOIR OF AND EICAS STATES 106.  EDP OPERATES NORMALLY AT 3000PSI.  CREW STATED #1 ENG LOW PRESSURE LIGHT WAS ILLUMINATED. PERFORMED DRY MOTOR #1 ENGINE.  ENGINE #1 HYDRAULIC PUMP HAS NO PRESSURE.  DRY MOTORED #2, ENGINE #2 HAS 3000PSI.REF: FIM 29-30/812. REQUIRES SYSTEM A FLUSH AND CASE DRAIN FILTER CHANGE. REMOVED #1 ENGINE DRIVEN PUMP IAW AMM 29-11-11-000-801-001 WAITING ON PARTS TO START INSTALL COMPLETED INSTALLATION FROM STEPS 3H(1)(D), (G), 2E, 8.  UP TO STEP I INSTALLATION TEST.  FILTERS REPLACED ON LPS 9235911, 9235895, 9242136, 9232090, 9232044.  PTU CASE DRAIN FILTER NOT REPLACED, REQUIRES REPLACEMENT.  REF: AMM 29-11-11-400-801-001.  R & R PTU FILTER, REF AMM 29-22-21. PERFORMED GVI OF RELATED ELECTRICAL CONNECTIONS, HYD LINES AND VERIFIED C/BS. PRESSURIZED HYD RESERVOIRS, REF AMM 29-09-00. PERFORMED FUNCTIONAL TEST OF EDP HYD SHUTOFF VALVE REF 29-11-81-710-802. BLED HYD SYSTEM REF AMM 29-00-00.3000PSI. OPS CHECK GOOD.

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