# SDR U2RA2021091400052

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 2021
- Submitted: September 15, 2021
- Operation: Air carrier
- Aircraft: [N702CA](https://openairdocs.org/aircraft/N702CA), registered now
- Make and model: Boeing 747412
- Aircraft serial: 27217
- Aircraft time: 81,420 hours, 12,582 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Fan
- Condition: Failed
- Location: Equip Cooling
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/U2RA2021091400052

## Discrepancy

ELECTRICAL SMOKE SMELL NOTICED, HOWEVER, NOT VISIBLE FROM DESCENT TO BELOW FL 200 - INCREASING UNTIL RUNNING QRH (QUICK REFERENCE HANDBOOK) CHECKLIST BEFORE APPROACH.  FOUND EQUIPMENT COOLING SUPPLY FAN EXCESSIVELY NOISY AND HOT.  SYSTEM DEFERRED AS A PRELUDE TO REPLACEMENT OF THE FAULTY COOLING SUPPLY FAN.

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