# SDR DALA2018051703415

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2018
- Submitted: May 18, 2018
- Operation: Air carrier
- Aircraft: [N593NW](https://openairdocs.org/aircraft/N593NW), registered now
- Make and model: Boeing 757351
- Aircraft serial: 32993
- Aircraft time: 53,445 hours, 17,713 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Filter
- Condition: Defective
- Location: Ac Bay
- Stage of operation: TX
- 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/DALA2018051703415

## Discrepancy

FLIGHT CREW REPORTED THAT AFTER BOTH ENGINES WERE STARTED IN MSP THERE WAS A VISIBLE HAZE THAT FILLED THE CABIN AND THE COCKPIT. REMOVED AND REPLACED BOTH RECIRCULATION AIR FILTERS PER AMM 21-25-02. RAN ENGINES. COULD NOT DUPLICATE AFTER FILTERS WERE CHANGED. INSPECTED DISTRIBUTION DUCTS. NO DISCREPANCIES NOTED. AIRCRAFT OK FOR SERVICE.

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