# SDR 2000UALA00777

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2000
- Submitted: December 21, 2000
- Operation: Air carrier
- Aircraft: N566UA
- Make and model: Boeing 757222
- Aircraft serial: 26670
- Aircraft time: 28,486 hours, 10,431 cycles
- Engine: Pwa PW2037
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Fan
- Condition: Failed
- Location: Recirculation
- Stage of operation: CR
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000UALA00777

## Discrepancy

'EQUIPMENT OVERHEAT' EICAS MESSAGE FOLLOWED BY ADI BACKGROUND TURNING BLACK. SUPPLEMENTAL DATA UPDATE THE AIRCRAFT EXPERIENCED A LEFT RECIRCULATION FAN FAILURE.  AFTER BEING DEFERRED,  THE EQUIPMENT COOLING CIRCUIT BREAKERS WERE NOT RESET.  THIS CAUSED THE EQUIPMENT TO OVERHEAT DUE TO LACK OF COOLING AIR.  THIS WAS A HUMAN ERROR - NO MECHANICAL SYSTEMS WERE DESCREPANT.

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