# SDR CALA2026021313769

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 11, 2026
- Submitted: February 13, 2026
- Operation: Air carrier
- Aircraft: [N24706](https://openairdocs.org/aircraft/N24706), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28767
- Aircraft time: 84,973 hours, 31,325 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Compensator
- Part number: 1U10652
- Part serial: 19048A
- Condition: Faulted
- Location: Zone 100
- Part time: 60,906 hours, 23,187 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026021313769

## Discrepancy

LOSS OF HYD SYS -A- QTY,  20 PERCENT AT FL290, INDICATIONS NORMAL.  WHEN LANDING, QTY JUMPED TO & STABILIZED AT 46% RF, CREW REPORTED NO ISSUE WITH FLT CONTROLS OR STEERING.  FOUND NO LEAKS, FLT CREW HAD FLT CONTROL SWITCH GUARD UP,  FLIPPED GUARD TO ON,  NOTICED A SUBSTANTIAL LEAK FROM LT WHEEL WELL COMPENSATOR CARTRIDGE ON  FLT CONTROLS HYD MODULE. LOOSENED MOUNT BOLTS ON FLT CONTROLS HYD MODULE.  R & R COMPENSATOR CARTRIDGE IAW AMM 27-09-51, SERVICED HYD, NO LEAKS ON COMPENSATOR OR HYD CONTROL MODULE.   DURING LEAK CHK OF COMPENSATOR, OPS FLAPS-SLATS HYD -B- QTY TRANSFERED TO HYD -A- WHEN FLAPS IN TRANSIT LEADING TO HYD -A- BEING OVERFILL BEYOND 106 CAUSING HYD FLUID TO COME FROM HYD DRAIN MAST, HYD -B- WENT DOWN & EXTENDED FLAPS-SLATS & SPEED BRAKES MULTIPLE TIMES, COULD NOT DUPLICATE FAULT. SERVICED BOTH A & B HYD RESERVOIRS TO OPTIMAL LEVELS, EXTENDED FLAPS-SLATS & SPEED BREAKS AGAIN, NO CHANGE.

---
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.