# SDR CALA2025090208380

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 31, 2025
- Submitted: September 2, 2025
- Operation: Air carrier
- Aircraft: [N17408](https://openairdocs.org/aircraft/N17408), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 68817
- Aircraft time: 34 hours, 18 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Pressure Switch
- Part number: 90G183
- Condition: Faulted
- Location: Zone 100
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025090208380

## Discrepancy

ELEC 1 FOR HYD B LOW PRESSURE LIGHT CAME ON DURING CRUISE PERFORMED TROUBLESHOOTING IAW FIM 29-32 TASK 803 STEP C. (1)-(7).(J). NO DISCREPANCIES NOTED AT THIS TIME.  REMOVE AND REPLACE HYDRAULIC SYSTEM B EMDP 1 LOW PRESSURE SWITCH, S795. REF AMM TASK 29-34-21-000-801 AND AMM TASK 29-34-21-400-801. REMOVED HYD SYSTEM B EMDP LP SWITCH IAW 29-34-21-000-801. INSTALLED NEW HYD SYSTEM B EMDP LP SWITCH IAW 29-34-21-400-801. INSTALL TEST GOOD AT THIS TIME. NO LEAKS NOTED AT THIS TIME.

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