# SDR CALA2026081418597

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2026
- Submitted: August 14, 2026
- Operation: Air carrier
- Aircraft: [N77535](https://openairdocs.org/aircraft/N77535), registered now
- Make and model: Boeing 737824
- Aircraft serial: 62751
- Aircraft time: 30,836 hours, 11,548 cycles
- Engine: Cfmint CFM567B27
- Engine time: 1,222 hours, 560 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 22064002
- Part serial: 6163
- Condition: Seized
- Location: Left
- Part time: 48,894 hours, 18,684 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: B, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026081418597

## Discrepancy

AIR RETURN FOR SMOKE/FUMES IN THE COCKPIT.  TROUBLESHOOTING COCKPIT SMOKE/ODOR IAW AMM 05-51-26-800-801-C1. NO SMOKE/ODOR DETECTED.  LEFT PACK TRIP LIGHT COMES ON SHORTLY AFTER TURNING ON , UNABLE TO TRIP RESET.  BURN ODOR COMING FROM LT PACK BAY. PERFORMED PACK TEMP CONTROL BITE CHK IAW FIM  21-62 TASK 801, FAULT CODES 21-51117 & 21-51123 APPEAR. REMOVED LT ACM, FOUND UNIT SEIZED, ALL WORK DONE IAW AMM 21-51-04-000-802-002.  INSTALLED LT ACM, IAW AMM 21-51-94-400-802-002,  LEAK & BITE CHK. PERFORMED, LT& R PACK/ZONE TEMP CONTROLLER BITE TEST, IAW AMM 21-61-00-740-801-002, TEST PASSED WITH NO FAULTS NOTED ON EITHER PACK, PERFORMED OPS & LEAK CHECK OF LT AIR CONDITIONING PACK, AND ACM, NO LEAKS NOTED, AIR CONDITIONING SYS IS FUNCTIONING NORMALLY.

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