Accident Aerospool WT-9 Dynamic N247DY, Friday 6 January 2012
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Date:Friday 6 January 2012
Type:Silhouette image of generic WT9 model; specific model in this crash may look slightly different    
Aerospool WT-9 Dynamic
Registration: N247DY
MSN: DY-247/2008
Total airframe hrs:70 hours
Engine model:Rotax 912ULS
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Glendale Municipal Airport - KGEU, AZ -   United States of America
Phase: Taxi
Departure airport:Glendale, AZ (KGEU)
Destination airport:Glendale, AZ (KGEU)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
According to the pilot, he performed a brake check and used the brakes numerous times while taxiing to the run-up area; however, as he approached the run-up area, the brakes failed, and the airplane continued to roll forward. He decided to steer the airplane off the taxiway surface and not risk an excursion onto the active runway. The airplane veered off the paved surface onto unprepared desert terrain, and the airplane continued to accelerate. The pilot attempted to shut down the engine with the ignition switch, but was unable to. He said that normal engine shut down is accomplished using two magneto switches on the instrument panel and not the ignition switch. The airplane then struck a boundary fence.

Postaccident examination revealed that the left wheel brake assembly was damaged by impact forces consistent with the airplane’s collision with the fence. The examination of the brake system for fluid leaks and functionality did not disclose any evidence of a preexisting mechanical malfunction that would have precluded normal operation. It is likely that, if the pilot had shut down the engine before the airplane departed the taxiway surface, he would have been able to stop in time to avoid colliding with the airport boundary fence.
Probable Cause: The pilot did not shut down the engine upon recognizing a brake malfunction. Contributing to the accident was the airplane's brake malfunction for undetermined reasons.

Accident investigation:
Investigating agency: NTSB
Report number: WPR12LA074
Status: Investigation completed
Duration: 2 months
Download report: Final report


FAA register:


Revision history:

07-Jan-2012 15:57 Alpine Flight Added
09-Jan-2012 10:55 Geno Updated [Aircraft type, Registration, Cn, Operator, Source, Narrative]
09-Jan-2012 17:11 RobertMB Updated [Time, Aircraft type, Departure airport, Source, Narrative, Plane category, ]
03-Feb-2012 16:23 Geno Updated [Source]
06-Feb-2013 01:42 Anon. Updated [Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:52 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Plane category]

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