NTSB Identification: DEN05IA076A
Scheduled 14 CFR United Air Lines
Incident occurred Tuesday, May 17, 2005 in Denver, CO
Probable Cause Approval Date: 10/27/2005
Aircraft: Boeing 737-322, registration: N305UA
Injuries: 187 Uninjured.

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

The two Boeing 737 company aircraft were involved in a ground collision while on the ramp. The first airplane, N305UA, was pushed straight back from its gate via a tug and wing walker. The airplane was disconnected from the tug and its engines were running. The pilots received hand signals from the tug operator releasing them from his guidance. The second airplane, N373UA, was being pushed back an adjacent gate via a tug and wing walker. The wing walker, who was positioned at the front of the right wing, stopped the pushback. The wing walker and tug operator had a brief discussion which resulted in the tug operator pulling the aircraft back toward the gate. The pilots of the first airplane visually cleared the area and began to taxi by turning to the west. During the turn, the left wing tip of the first airplane struck the right wing tip of the second company airplane.

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

the pilot's failure to maintain clearance resulting in the left wing of the aircraft striking the right wing of an adjacent aircraft. A factor in this incident was the improper procedure performed by the ground crew (of the second aircraft involved).

Full narrative available

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