http://registry.faa.gov/N247DY
NTSB Identification: WPR12LA074
14 CFR Part 91: General Aviation
Accident occurred Friday, January 06, 2012 in Glendale, AZ
Probable Cause Approval Date: 03/28/2012
Aircraft: CZECH SPORTPLANES SRO DYNAMIC WT9, registration: N247DY
Injuries: 1 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
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.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:
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.
On January 6, 2012, at 0800 mountain standard time, a Czech Sportplanes Dynamic WT-9, N247DY, collided with a fence following an excursion off the taxiway at the Glendale, Arizona, airport. The aircraft was operated by the pilot for a local area personal flight conducted under the provisions of 14 CFR Part 91 of the Federal Aviation Regulations. Visual meteorological conditions prevailed. The airplane sustained substantial damage and the pilot was not injured.
While taxing to the run-up area the pilot performed a brake check and used the brakes numerous times while taxing. The pilot said that the brakes failed as he approached the run-up area 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. Once off the paved surface and onto unprepared desert terrain, the airplane continued to accelerate. The pilot attempted to shut down the engine with the ignition switch but the engine remained operating. The airplane veered to the left, continued to proceed over the unprepared terrain, and impacted the airport boundary chain link fence.
The pilot said that normal engine shut down is accomplished using two magneto switches on the instrument panel and that the ignition switch does not shut down the engine.
NTSB investigators examined the airplane and found the left wheel brake assembly damaged by impact forces consistent with the airplane’s collision with the chain link fence. The brake system was inspected for fluid leaks and functionality. No preexisting condition was identified that would have precluded the normal operation of the brake system.
IDENTIFICATION
Regis#: 247DY Make/Model: LSA Description: DYMAMIC WT9 LSA
Date: 01/06/2012 Time: 1452
Event Type: Accident Highest Injury: None Mid Air: N Missing: N
Damage: Substantial
LOCATION
City: GLENDALE State: AZ Country: US
DESCRIPTION
AIRCRAFT ON TAXI, WENT OFF THE TAXIWAY AND STRUCK A FENCE, GLENDALE, AZ
INJURY DATA Total Fatal: 0
# Crew: 1 Fat: 0 Ser: 0 Min: 0 Unk:
# Pass: 0 Fat: 0 Ser: 0 Min: 0 Unk:
# Grnd: Fat: 0 Ser: 0 Min: 0 Unk:
WEATHER: 1455 CALM VIX20 FEW250 06/00 A3005
OTHER DATA
Activity: Unknown Phase: Taxi Operation: OTHER
FAA FSDO: SCOTTSDALE, AZ (WP07) Entry date: 01/09/2012
A single-engine plane taxied into a fence Friday morning at the Glendale Municipal Airport after the plane’s brakes failed as it prepared to take off.
The pilot was not injured but there was significant damage to the Czech Sport plane, FAA spokesman Ian Gregor said.
The FAA will investigate the crash further, Gregor said.
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