What happened
During the landing roll, the aircraft experienced a sudden loss of directional control. The incident was initiated when a portable oxygen bottle, which had been stowed beneath the pilot's seat, slid forward unexpectedly. This loose object jammed the rudder pedals, preventing the pilot from maintaining or correcting the aircraft's heading on the runway.
Unable to steer effectively due to the mechanical obstruction, the aircraft departed the side of the runway. The impact with the ground resulted in significant structural damage. The landing gear collapsed under the stress, leading to the nose cone being crushed. Additionally, the right main wing spar was twisted as a result of the off-center forces applied during the excursion.
The investigation
The physical evidence pointed directly to the stowed equipment as the primary mechanical failure point. Investigators found that the oxygen bottle had not been secured properly, allowing it to move freely under the pilot's seat. When the deceleration forces of the landing roll acted upon the unsecured item, it shifted position and became wedged against the rudder pedal mechanism. This jamming action effectively neutralized the pilot's ability to control the aircraft's direction during a critical phase of flight.
Findings
The sequence of events highlights a critical safety hazard regarding the stowage of loose items in the cockpit. The failure to secure the portable oxygen bottle allowed it to become a projectile and a mechanical obstruction. This lack of restraint directly contributed to the loss of directional control and the subsequent departure from the runway. The collapse of the landing gear and damage to the wing spar were secondary consequences of the initial loss of control, rather than primary causes.
Safety message
Pilots must ensure that all portable equipment, including oxygen bottles, is securely stowed during all phases of flight, particularly during landing roll where high deceleration forces are present. Loose items can easily shift and interfere with critical flight controls, leading to catastrophic loss of control.