# SDR UIEA200400033

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 22, 2004
- Submitted: July 21, 2004
- Operation: Air carrier
- Aircraft: [N408MC](https://openairdocs.org/aircraft/N408MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29261
- System (JASC): [3040 · Windshield/Door Rain/Ice Removal](https://openairdocs.org/jasc/3040)
- Part: Control Unit
- Condition: Malfunctioned
- Location: Cockpit Window
- 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/UIEA200400033

## Discrepancy

EICAS MESSAGE -HEAT WINDOW LT- DISPLAYED AFTER 1 HOUR CRUISE FLT AT FL330 AND SIMULTANEOUSLY L1 WINDOW CRACKED.  PRESSURIZATION WAS NORMAL.  REPLACED L1 WINDOW HEAT CONTROL UNIT IAW MM 30-41-00 OPERATION CHECK NORMAL.  REMOVED AND REPLACED L1 WINDSHIELD IAW MM 56-11-01 AND OPERATION CHECK NORMAL.  (M)

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