Dhc-8 flight crew reports inability to rotate at vr after being deiced with type iv deicing fluid. T...

Narrative:

When we arrived at the airport for our xa:27 a.m. Report the aircraft was being deiced with type I; which commenced around xa:00 a.m. Operations informed us the night before the aircraft was treated with type I and type iv. After they were finished with the application of type I we went out to the airplane and did our preflight duties. After boarding and the checklists were complete they started with the type I application of 55/45 at xb:30 and the type iv application at xb:54. ASOS was reporting calm wind; 3/4 mile visibility; -sn; and -2 degrees celsius. Before we could hear it again tower opened early and broadcast information which reported 1 mile visibility; -sn; and -2 degrees C. We called dispatch concerned because the weather seemed to be marginal in regards to the hold over time. Dispatch concurred with what the tower was calling and said they showed 1 mile visibility as well. When we called for taxi ground told us the wind had picked up 270 at 20 KTS. At the end of the runway we completed the ice check and taxi and before takeoff checklists. Just as we took the runway the plow trucks had cleared the runway. Before take off I held the brakes for 10 seconds with the power at 50-55%. We did skid a little bit with the brakes held. Once the brakes were released it was a normal takeoff 90%. When V1 and vr were called I attempted to rotate with normal back pressure. I then added even more back pressure to assure enough was asserted. It failed to rotate and I called 'reject'. Once stopped we returned to the gate. The aircraft failed to rotate. We believe the greatest contributing factor was the weather and the type iv deice fluid. Although we met all the parameters for departure when we returned to the gate the aircraft was saturated in a thick coat of deice fluid.

Original NASA ASRS Text

Title: DHC-8 flight crew reports inability to rotate at VR after being deiced with Type IV deicing fluid. Takeoff is rejected successfully and flight returns to gate; where the crew observes a thick coat of Type IV fluid adhering to the aircraft.

Narrative: When we arrived at the airport for our XA:27 a.m. report the aircraft was being deiced with Type I; which commenced around XA:00 a.m. Operations informed us the night before the aircraft was treated with Type I and Type IV. After they were finished with the application of Type I we went out to the airplane and did our preflight duties. After boarding and the checklists were complete they started with the Type I application of 55/45 at XB:30 and the Type IV application at XB:54. ASOS was reporting calm wind; 3/4 mile visibility; -SN; and -2 degrees Celsius. Before we could hear it again Tower opened early and broadcast information which reported 1 mile visibility; -SN; and -2 degrees C. We called Dispatch concerned because the weather seemed to be marginal in regards to the hold over time. Dispatch concurred with what the Tower was calling and said they showed 1 mile visibility as well. When we called for taxi Ground told us the wind had picked up 270 at 20 KTS. At the end of the runway we completed the ice check and taxi and before takeoff checklists. Just as we took the runway the plow trucks had cleared the runway. Before take off I held the brakes for 10 seconds with the power at 50-55%. We did skid a little bit with the brakes held. Once the brakes were released it was a normal takeoff 90%. When V1 and VR were called I attempted to rotate with normal back pressure. I then added even more back pressure to assure enough was asserted. It failed to rotate and I called 'Reject'. Once stopped we returned to the gate. The aircraft failed to rotate. We believe the greatest contributing factor was the weather and the Type IV deice fluid. Although we met all the parameters for departure when we returned to the gate the aircraft was saturated in a thick coat of deice fluid.

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.

Attributes
ACN	873471
Time
Date	201002
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	Dash 8-300
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Elevator
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Other / Unknown Ground Event / Encounter Other / Unknown

Dhc-8 flight crew reports inability to rotate at vr after being deiced with type iv deicing fluid. Takeoff is rejected successfully and flight returns to gate; where the crew observes a thick coat of type iv fluid adhering to the aircraft.