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A CRJ200's air driven generator deployed automatically on takeoff with all electrical systems normal and no action by the crew. The aircraft was returned to the departure airport.
| Attributes | |
| ACN | 940812 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Regional Jet 200 ER/LR (CRJ200) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Component | |
| Aircraft Component | DC Ram Air Turbine |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 34 Flight Crew Total 12800 Flight Crew Type 2000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Immediately after take-off; the aircraft started making a loud sound (wind noise and buzzing). We selected the EICAS electrics page and observed that the air driven generator (air driven generator) was deployed and powering the essential bus. We completed the checklist for air driven generator inadvertent deployment. Pressing the air driven generator power transfer override button did not re-establish normal power. We accepted delay vectors from ATC to burn enough fuel to get down to our max landing weight. We completed a normal landing. The power supply to the essential bus switched from the air driven generator to bus 1 during the landing roll out between 80 and 60 KTS. We taxied in normally. The air driven generator manual release handle was not touched during this event. All generators were operating normally.
Original NASA ASRS Text
Title: A CRJ200's Air Driven Generator deployed automatically on takeoff with all electrical systems normal and no action by the crew. The aircraft was returned to the departure airport.
Narrative: Immediately after take-off; the aircraft started making a loud sound (wind noise and buzzing). We selected the EICAS electrics page and observed that the Air Driven Generator (ADG) was deployed and powering the essential bus. We completed the checklist for ADG inadvertent deployment. Pressing the ADG Power Transfer Override button did not re-establish normal power. We accepted delay vectors from ATC to burn enough fuel to get down to our max landing weight. We completed a normal landing. The power supply to the essential bus switched from the ADG to Bus 1 during the landing roll out between 80 and 60 KTS. We taxied in normally. The ADG manual release handle was not touched during this event. All generators were operating normally.
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.