NTSB Identification: WPR10LA413
14 CFR Part 137: Agricultural
Accident occurred Thursday, August 19, 2010 in Buckeye, AZ
Probable Cause Approval Date: 10/29/2013
Aircraft: GRUMMAN ACFT ENG COR-SCHWEIZER G-164B, registration: N6607Q
Injuries: 1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The pilot had flown the airplane about 4.2 hours on the date of the accident with no discrepancies noted. During the accident takeoff, the pilot noted normal acceleration, engine indications, and tail liftoff. After completing 2/3 of the takeoff roll, the engine rpm increased to 2,600-2,700 (the maximum allowable is 2,550 rpm). The pilot felt a moderate-to-severe vibration and immediately initiated procedures for an aborted takeoff. He retarded the throttle to idle, applied maximum braking, and held the control stick full aft. As the airplane slowed to 20-30 knots, he steered the airplane away from a fence at the end of the runway onto hard packed desert terrain. After rolling a short distance, the left main landing gear encountered a depression in the terrain and sheared off. The airplane settled onto the left wing and was almost immediately engulfed in fire. Fire consumed the cabin and inboard wing areas, as well as the aft section of the engine, which exposed the gears in the accessory section. Fire consumed all accessories, including both magnetos. A postaccident examination of the engine could not determine a reason for the increase in rpm and vibration due to fire damage.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

An increase in engine rpm and vibration, which resulted in an aborted takeoff and runway excursion. The reason for the increased engine rpm and vibration could not be determined because of postaccident fire damage.

Full narrative available

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