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B737-800 flight crew was dispatched with engine anti-ice valve stuck in the open position per MEL 30-3B. However; maintenance failed to deactivate high stage bleed valve as required by MEL. Cowl anti-ice light illuminates after takeoff and crew returned to departure airport for over weight landing.
| Attributes | |
| ACN | 842157 |
| Time | |
| Date | 200906 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Intake Ice System |
| Person 1 | |
| Function | Pilot Flying Captain |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural MEL |
Narrative:
Before departure; we had a #1 engine anti-ice valve stuck in the open position. Maintenance then deferred this item per 30-3B of the MEL; which specifies that the associated high stage bleed valve must also be locked closed. I assumed it was done since the mechanic balanced our write-up by saying that the maintenance procedure per MEL item 30-3B had been complied with; but did not specify also deactivating the high stage bleed valve. After takeoff; the amber #1 'cowl anti-ice' light illuminated. The QRH checklist was completed; and the light extinguished with a reduction of the #1 thrust lever. Being unable to continue I elected to return. Although we were approximately 5000 pounds over max landing weight; I decided to land immediately due to concern over the bleed overpressure event with the valve; thunderstorm activity in the terminal area; and the difficulty in burning fuel down due to the reduced power on the one engine. We declared an emergency with approach for the overweight landing.
Original NASA ASRS Text
Title: B737-800 flight crew was dispatched with engine anti-ice valve stuck in the open position per MEL 30-3B. However; maintenance failed to deactivate high stage bleed valve as required by MEL. Cowl anti-ice light illuminates after takeoff and crew returned to departure airport for over weight landing.
Narrative: Before departure; we had a #1 engine anti-ice valve stuck in the open position. Maintenance then deferred this item per 30-3B of the MEL; which specifies that the associated high stage bleed valve must also be locked closed. I assumed it was done since the Mechanic balanced our write-up by saying that the maintenance procedure per MEL item 30-3B had been complied with; but did not specify also deactivating the high stage bleed valve. After takeoff; the amber #1 'Cowl Anti-ice' light illuminated. The QRH checklist was completed; and the light extinguished with a reduction of the #1 thrust lever. Being unable to continue I elected to return. Although we were approximately 5000 LBS over max landing weight; I decided to land immediately due to concern over the bleed overpressure event with the valve; thunderstorm activity in the terminal area; and the difficulty in burning fuel down due to the reduced power on the one engine. We declared an emergency with approach for the overweight landing.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.