# SDR CALA2026071617802

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2026
- Submitted: July 16, 2026
- Operation: Air carrier
- Aircraft: [N37464](https://openairdocs.org/aircraft/N37464), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 41745
- Aircraft time: 42,506 hours, 15,729 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Shutoff Valve
- Part number: 32149721
- Part serial: 3810
- Condition: Faulted
- Location: Trim Air
- Part time: 42,496 hours, 15,725 cycles
- 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/CALA2026071617802

## Discrepancy

UNABLE TO CONTROL FLIGHT DECK TEMP EXCESSIVELY COLD NO NON NORMAL.  REPLACED TRIM AIR MODULATING VALVE IAW 21-61-21.  PERFORMED INITIAL EVALUATION PER FIM 21-62 TASK 901. CONTROL CABIN TEMP INCREASES & DECREASES WITH TEMP SELECTOR ON R & R TRIM AIR PRSOV IAW 21-62-01-000-801, 21-62-01-400-801.  PERFORMED PACK TEMPERATURE CONTROL BITE PROCEDURE PER FIM 21-62 TASK 801. NO FAULTS NOTED. PICTURES ADDED. CONTINUED FAULT ISOLATION PROCEDURE. CHECKED VOLTAGE AT TRIM AIR PRSOV CONNECTOR D3914 PIN 1. READS 28V DC. PER FIM 21-62 TASK 901 STEP F.(3) (C), NEXT STEP IS TO REPLACE TRIM AIR PRSOV V146.  REMOVED AND REPLACED CONTROL CABIN TEMPERATURE SELECTOR.

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