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Crj-700 captain reported an airspeed loss and autopilot disconnect departing iad; which may have been related to a wake turbulence encounter.
| Attributes | |
| ACN | 1528133 |
| Time | |
| Date | 201803 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | IAD.Airport |
| State Reference | DC |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Regional Jet 700 ER/LR (CRJ700) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
After de-icing; we taxied to runway 30; turned on the wing ice protection and departed. Upon reaching acceleration altitude; the flaps were retracted and climb thrust was set and I rolled the speed bug to 250. Before the airplane began to accelerate; we experienced an airspeed loss of about 15 knots possibly from wake turbulence at approximately 2500 ft. MSL. The airplane was not accelerating when the autopilot disconnected. I then lowered the nose to level and moved the thrust levers back into the takeoff/go around detent and the airplane accelerated normally. The climb was continued and the autopilot re-engaged. The autopilot functioned properly for the next five legs.I believe the combination of reduced power due to ice protection and the timing of the airspeed loss caused the auto pilot disconnection and slow acceleration.
Original NASA ASRS Text
Title: CRJ-700 Captain reported an airspeed loss and autopilot disconnect departing IAD; which may have been related to a wake turbulence encounter.
Narrative: After de-icing; we taxied to runway 30; turned on the wing ice protection and departed. Upon reaching acceleration altitude; the flaps were retracted and climb thrust was set and I rolled the speed bug to 250. Before the airplane began to accelerate; we experienced an airspeed loss of about 15 knots possibly from wake turbulence at approximately 2500 ft. MSL. The airplane was not accelerating when the autopilot disconnected. I then lowered the nose to level and moved the thrust levers back into the Takeoff/Go Around detent and the airplane accelerated normally. The climb was continued and the autopilot re-engaged. The autopilot functioned properly for the next five legs.I believe the combination of reduced power due to ice protection and the timing of the airspeed loss caused the auto pilot disconnection and slow acceleration.
Data retrieved from NASA's ASRS site 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.