# SDR CALA2026080718367

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2026
- Submitted: August 7, 2026
- Operation: Air carrier
- Aircraft: [N81449](https://openairdocs.org/aircraft/N81449), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 31651
- Aircraft time: 44,243 hours, 16,292 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Plenum
- Part number: 22156291SD
- Condition: Leaking
- Location: Lt A/C Pack
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026080718367

## Discrepancy

LEFT WING BODY OVERHEAT IN FLIGHT.  RAN QRH,  LIGHT WENT OUT.  FOUND LEAKING CLAMP & HOLE IN LT HEAT EXCHANGER PLENUM.  PERFORMED WHEEL WELL, WING, LOWER BODY OVERHEAT OPS TEST. NO FAULTS NOTED. OPS CHK NORMAL. OK TO CONTINUE. LT PACK AFT HEAT FIBERGLASS HEAT EXCHANGER DUCT HAS A HOLE ON TOP REMOVED LEFT HEAT EXCHANGER AND PLENUM DIFFUSER ASSEMBLY REF AMM TASK 21-51-03-000-805-002. INSTALLED NEW PRIMARY PLENUM ON HEAT EXCHANGER REF AMM TASK 21-51-03-400-804-002.  LEFT PACK TEMP CONTROL VALVE AFT CLAMP HAS A LEAK.   R & R LT PACK TCV V-BAND CLAMPS IAW AMM 21-51-10. NEEDS LEAK CHECKED AFTER PACK RE-ASSEMBLY.

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