# SDR CALA2026091619468

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 13, 2026
- Submitted: September 16, 2026
- Operation: Air carrier
- Aircraft: [N14249](https://openairdocs.org/aircraft/N14249), registered now
- Make and model: Boeing 737824
- Aircraft serial: 28809
- Aircraft time: 77,491 hours, 30,020 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Diffuser
- Part number: 22156283
- Condition: Missing
- Location: Rt A/C Pack
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026091619468

## Discrepancy

PDA 1 WHILE TS LOG PAGE 3335170  USED FIM 21-53-TASK 820. ON STEP F (1) C.  FOUND THE FAN BYPASS CHECK VALVE DOOR MISSING OFF THE PRIMARY DIFFUSER.  USING FIM 21-53-820 AND ON STEP F (1) C. WE FOUND THE FAN BYPASS VALVE DOOR MISSING ON THE PRIMARY DIFFUSER. PER THE FIM THIS WILL CAUSE THE LIGHT TO COME ON WITHOUT THE MASTER RECALL USED. REMOVED AND REPLACED RH PACK AFT PRIMARY DIFFUSER ASSY REF AMM 21-51-03-400-804-002 UP TO STEP J INSTALLATION TEST. LEAK AND OPS CHECK STILL REQUIRED PARTS USED: 29-2151-3-0064,QTY :1

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