# SDR 99UAL900223

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N643UA](https://openairdocs.org/aircraft/N643UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25093
- Engine: Pwa PW4060
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Fan
- Condition: Failed
- Location: Flight Deck
- Stage of operation: CR
- Nature of condition: B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900223

## Discrepancy

'FWD EQ EXH FAN' EICAS MESSAGE DISPLAYED.  SMOKE ON FLIGHT DECK. CB H21 ON P6 PULLED AS PRECAUTION.  SMOKE EVAC PERFORMED AND SMOKE DISSIPATED.  *S/D*  SMOKE IN FLIGHT DECK WAS PROBABLY CAUSED BY A BEARING FAILURE IN FORWARD EQUIPMENT EXHAUST FAN.  THIS FAN WAS REPLACED PER MM 21-59-06.  THERE HAS BEEN NO ADDITIONAL REPORTS OF SMOKE.  THIS FAN IS NOT AN MR UNIT.

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