# SDR CALA2026032614844

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 24, 2026
- Submitted: March 26, 2026
- Operation: Air carrier
- Aircraft: [N13113](https://openairdocs.org/aircraft/N13113), registered now
- Make and model: Boeing 757224
- Aircraft serial: 27555
- Aircraft time: 108,228 hours, 25,814 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Heat Exchanger
- Part number: 1942703
- Part serial: 1101872
- Condition: Cracked
- Location: Zone 100
- Part time: 821,860 hours, 720,111 cycles
- 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/CALA2026032614844

## Discrepancy

VERY LOUD AIR NOISE COMING FROM LEFT AC BAY.  INSPECTED AND FOUND LEFT HEAT EXCHANGER BLOWN.  SEE PHOTO. REMOVED PIMARY AND SECONDARY HEAT EXCHANGER REF AMM 21-51-02-004-001 INSTALLED NEW PRIMARY HEAT EXCHANGER ON TO THE SECONDARY HEAT EXCHANGER ON GROUND STEP G UP TO SUBSTEP 1 (D) REF AMM 21-51-02 HEAT EXCHANGER INSTALLED REF TASK 21-51-02-404-019 EMPLYEES 349261, 349381, 351397 SDR CREATED.

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