# SDR SWAA2026011259836

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 8, 2026
- Submitted: January 12, 2026
- Operation: Air carrier
- Aircraft: [N445WN](https://openairdocs.org/aircraft/N445WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29841
- Aircraft time: 70,818 hours, 42,590 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Check Valve
- Condition: Faulted
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2026011259836

## Discrepancy

SUSPECTED COMPRESSOR STALLS (X3) ON NR 1 ENG UPON LEVEL OFF.  ACCOMP BY FLUCTUATING EGT MOMENTARILY.  STABILIZED WITHOUT REPEAT FOR DURATION OF FLT. CREW NOTED EVENT HAPPENED WITH AUTOTHROTTLES ENGAGED.   REMOVED ENG 1 HAND CRANK PAD IAW AMM 72-63-01-000-801-F00.  C/W REQUIRED BOROSCOPE INSPECTIONS IAW AMM 71-00-00-210-801-F00. NO FINDINGS NOTED.   PERFORMED FIM 71-05, TASK 805 UP TO E6 STEP B1. REMOVED & INSTALLED BORESCOPE PLUGS 1, 2, 4, 5, 8, 9, 17, & 18 IAW AMM 72-00-00. REMOVED & INSTALLED LT & RT IGNITER PLUGS FOR BORESCOPE INSPECTION IAW AMM 74-21-02.  IGNITER TEST PASSED FOR BOTH LT & RT.  PERFORMED 5TH STAGE CHK VALVE INSP IAW FIM 71-05 805 & FOUND NO DEFECTS.  INSTALLED 5TH STAGE CHECK VALVE IAW AMM 36-11-0209.  R & R 5TH STAGE CHECK VALVE ON NR 1 ENG IAW AMM 36-11-02 REF TTG8Q019T24D.  PERFOMED REMAINING STEPS OF FIM 71-05 TASK 805; IAW TSR 202600162.   PERFORMED POWER ASSUANCE CHK IAW AMM 71-00-00. ALL PARAMETERS NORMAL, NO DEFECTS NOTED.

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