Accident Overview
A Gulfstream G-IV experienced a loss of directional control during takeoff on Runway 34 at an unspecified airport. The crosswind was reported from 280° at 24 knots. Approximately 1,340 feet after the takeoff roll began, the airplane veered left 5.14° to a heading of 335°. It subsequently departed the runway, with tire marks indicating no braking was applied.
Cockpit Actions
During the event, one pilot was heard to say, "Reverse," followed by another saying, "No, no, no, go, go, go, go, go."
Sequence of Events
The airplane traversed a shallow ditch parallel to the runway, resulting in the separation of both main landing gear, the left and right flaps, and a piece of the left aileron control cable. The aircraft became airborne after encountering a small berm at the departure end of the runway. The left wing fuel tank reportedly exploded. The main wreckage came to rest approximately 6,650 feet from the start of the takeoff roll.
Examination Findings
Post-accident examination revealed no preexisting anomalies with the engines, flight controls, or aircraft systems. The Nose Wheel Steering Select Control Switch was found in the "Handwheel Only" position, rather than the "Normal" position. The pilot-in-command (PIC) routinely flew with the switch in the "Normal" position.
Crew and Operational Context
The flight crew consisted of a PIC and a copilot (pilot-not-flying) operating under an Interchange Agreement between two companies that operated G-IV aircraft. The agreement and the companies' operations manuals did not address mixed crews, procedural differences, or aircraft difference training.
Probable Cause
Failure of the pilot-in-command (PIC) to maintain directional control of the airplane during the takeoff roll in a gusty crosswind, his failure to abort the takeoff, and failure of the copilot to adequately monitor and/or take sufficient remedial action to help avoid the occurrence. Factors relating to the accident included the gusty crosswind condition, the drainage ditch, the flight crew's inadequate preflight, the Nose Wheel Steering Control Select Switch in the "Handwheel Only" position, and the lack of standardization of the two companies' operations manuals and Interchange Agreement.