What happened
The accident occurred at Seattle-Tacoma International Airport during winter operations involving significant snowfall. N341PL, a Boeing 737, was positioned on runway 31L preparing for takeoff. Simultaneously, a Boeing 747 aircraft was cleared to taxi southeast along the outer parallel taxiway, located 375 feet to the right of the runway centerline.
As the Boeing 747 paused briefly before turning 90 degrees left onto taxiway KK, N341PL received clearance and began its takeoff roll. The pilot reported seeing light snow behind the large aircraft but remained unconcerned because the jet had stopped. However, tower controllers and other witnesses observed that snow accumulation increased significantly as the Boeing 747 turned off the outer taxiway.
After lifting off, N341PL remained in ground effect while accelerating to climb speed. The pilot stated this procedure was part of his standard training for all takeoffs. Shortly after calling for gear retraction, the aircraft entered a whiteout condition caused by the snow cloud. The pilot leveled his wings from a roll and encountered a downdraft. N341PL emerged from the snow cloud and struck the runway approximately 1,100 feet before passing behind the Boeing 747.
The investigation
Investigation revealed that the pilot had been trained to use the ground effect acceleration technique on all takeoffs. Flight Safety International noted that during ground and simulator training, they recommend establishing a positive rate of climb in instrument meteorological conditions (IMC) and at night. This recommendation contrasts with the pilot's stated procedure of remaining in ground effect.
Findings
The primary contributing factor was the loss of visual reference due to a whiteout condition generated by snow displaced from the taxiing Boeing 747. The pilot's decision to remain in ground effect rather than establishing a positive climb rate contributed to the inability to see the runway environment clearly. 1 fatal and 0 injured were reported among those on board.
Safety message
Aviation safety organizations emphasize the importance of transitioning to a positive rate of climb immediately after takeoff, particularly in low-visibility conditions such as snow or IMC. Remaining in ground effect can delay the acquisition of necessary visual cues and increase the risk of controlled flight into terrain or runway strikes when visual references are obscured.