# SDR DALA2024102410378

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2024
- Submitted: October 24, 2024
- Operation: Air carrier
- Aircraft: [N543US](https://openairdocs.org/aircraft/N543US), registered now
- Make and model: Boeing 757251
- Aircraft serial: 26490
- Aircraft time: 86,338 hours, 32,854 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Odor
- Stage of operation: IN
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2024102410378

## Discrepancy

SHIP 5643 BOTH PACKS PRODUCE A HEAVY MUSTY SMELL, MOST NOTICABLE WHEN SWITCHING PACKS FROM ENGINE O APU BLEED AIR AND VICEVERSA. CORRECTIVE ACTION: T/S FOUND OIL CONTMINATION AT HEAT EXCHANGER - LT AND RT. REPLACED LT AND RT SIDE ECS BAY PRIMARY AND SECONDARY HEAT EXCHANGERS REF B757 AMM 21-51. REPLACED RECIRC FAN. C/W OIL CONTAMINATION REMOVAL.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.