# SDR UIEA2014120800644

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2014
- Submitted: December 9, 2014
- Operation: Air carrier
- Aircraft: [N493MC](https://openairdocs.org/aircraft/N493MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29254
- Aircraft time: 62,515 hours, 9,642 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cockpit
- 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/UIEA2014120800644

## Discrepancy

DURING PREFLIGHT A LOUD BANG & POPPING SOUND WAS HEARD INSIDE & OUTSIDE OF ACFT.  A BURNING SMELL WAS IN THE COCKPIT FOR ABOUT 30-45 SECONDS.  INSPECTED & VERIFIED EE COOLING SYS IN & OUT FAN MOTOR VLV DUCTS, NO DEFECTS NOTED.  CLEANED EE COOLING SYS CLEANER ON CMC EE COOLING SYS.  TEST PASSED IAW MM 21-58-00 FOUND NO BURNING SMELL.

---
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.