# SDR UALA2011041801858

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 16, 2011
- Submitted: April 20, 2011
- Operation: Air carrier
- Aircraft: N548UA
- Make and model: Boeing 757222
- Aircraft serial: 25396
- Aircraft time: 73,461 hours, 21,221 cycles
- Engine: Pwa PW2037
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Heat Exchanger
- Part number: 1942704
- Part serial: 1101867
- Condition: Damaged
- Location: Ac Pack
- Stage of operation: NR
- 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/UALA2011041801858

## Discrepancy

PRIMARY HEAT EXCHANGER IS DAMAGED AT INTAKE DUCT, HAS DENT POSSIBLE CRACK.  THE COOLING FINS HAVE HEAT DAMAGE & EXFOLIATION. SOME FINS APPEAR TO BE WELDED TOGETHER.  ACCOMPLISHED REMOVAL OF PRIMARY AND SECONDARY HEAT EXCHANGER PER MM.  REPLACED PRI & SEC HEAT XCH PER AMM DUE TO CRACKED HEAT XCHG.  RAN RT PACK, OPS CHK NORMAL

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