# SDR CALA2025031902943

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2025
- Submitted: March 19, 2025
- Operation: Air carrier
- Aircraft: [N37277](https://openairdocs.org/aircraft/N37277), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31595
- Aircraft time: 70,450 hours, 24,960 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: Valve
- Part number: 32144464
- Part serial: 3347
- Condition: Faulty
- Location: Eng 1
- Part time: 22,614 hours, 9,311 cycles
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025031902943

## Discrepancy

DUCT PRESSURE INDICATION LOW (BELOW 18 PSIG) DURING TAKEOFF, CLI MB AND CRUISE; THE ENGINE IS THE BLEED SOURCE PER TECH SUPPORT REMOVED AND REPLACE THE HIGH STAGE VALVE. PERFORMED TASK 36-11-06-000-801 UP TO AND INCLUDING 2.D.(3)(E)29-3611-9-0002,QTY :1 FOR TRACKING PURPOSES ONLY ROTABLE PARTS CHG:TT # 1425541 SN OFF 3347 PN OFF 29-3611-9-0002 IPC REFERENCE # NO COMPONENT FOUND COMPLETED HIGH STAGE VALVE INSTALLATION NO LEAKS AT VALVE OR SENSE LINE PER AMM TASK 36-11-06-400-801 PERFORMED HIGH POWER RUNS SUCCESFULLY GOT ABOUT 40 PSI VALVE, HIGH STA  OFF 29-3611-9-0002 3347 ON 29-3611-9-0002 2259

---
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.