# SDR UIEA200800330

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2008
- Submitted: October 15, 2008
- Operation: Air carrier
- Aircraft: [N429MC](https://openairdocs.org/aircraft/N429MC), registered now
- Make and model: Boeing 747481
- Aircraft serial: 24833
- Aircraft time: 73,789 hours, 9,666 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cockpit
- Stage of operation: CL
- How discovered: O
- Nature of condition: B, G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA200800330

## Discrepancy

AIR TURNBACK - LLCCAFR SWITCH IN POSITION "BOTH" TEMP SELECTED FOR 7° LOWER FORWARD , AFT MAIN DECK, FWD AND AFT.  THE AIR IN THE COCKPIT WAS UNCONTROLLABLE - HIGH PRESS AIR BLOWING AROUND NAV DISPLAY - SELECTED THE LLCCAFR SWITCH OFF TO CONTROL THE TEMP IN THE COCKPIT CAUSED A BURST OF MIST COMING FROM AND AROUND ALL NAV DISPLAYS & MCP PANEL.  THE COCKPIT FILLED WITH A STRONG ODOR OF OVERHEAT.  LOST EICAS DISPLAYS AND PFDS.

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