# SDR UIEA2018091801991

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 17, 2018
- Submitted: September 19, 2018
- Operation: Air carrier
- Aircraft: [N473MC](https://openairdocs.org/aircraft/N473MC), registered now
- Make and model: Boeing 747-45E
- Registry model: [Boeing 747-45E](https://openairdocs.org/model/boeing-747-45e) (OpenAirDocs)
- Aircraft serial: 27174
- Aircraft time: 101,699 hours, 18,083 cycles
- System (JASC): [2170 · Humidity Control System](https://openairdocs.org/jasc/2170)
- Part: Coalescer Bag
- Part number: 2437983
- Condition: Dirty
- Location: Ac Bay
- Stage of operation: AP
- How discovered: O
- Nature of condition: B, J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2018091801991

## Discrepancy

MAIN DECK SMOKE ON FINAL APPROACH CAUSING "FIRE MAIN DECK". SMOKE DETECTION TEST PASS. NR 1 PACK WATER COALESCER REPLACED. NR 2 WATER COALESCER BAG REPLACED. FOUND MSG 21773, PACK 1 TRIP. DEFERRED PACK 1.

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