Event Details

Title:Collision with overpass, Boeing 757-2S7, Denver, March 1, 1997
Micro summary:This Boeing 757-2S7's vertical stabilizer hit an overpass.
Event Time:1997-03-01 at 2012 MST
File Name:1997-03-01-US.pdf
Publishing Agency:National Transportation Safety Board (NTSB)
Publishing Country:USA
Report number:FTW97IA112
Site of event:Denver, CO
Departure:Phoenix Sky Harbor International Airport, Phoenix, Arizona, USA
Destination:Denver International Airport, Denver, Colorado, USA
Airplane Type(s):Boeing 757-2S7
Flight Phase:Taxi
Operator(s):America West Airlines
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:

NTSB short summary:

the pilot-in-command's failure to comply with company procedures/directives to not taxi the aircraft beneath the bridge/overpass, and his misjudgment of clearance between the vertical stabilizer and the bridge/overpass.

NTSB synopsis:

The airplane landed on runway 07, and the crew was instructed to contact ramp control. Ramp control, manned by airport personnel (not ATC personnel) instructed the crew to taxi east on taxiway AS to gate A44. The airplane was taxied underneath a pedestrian bridge/overpass (bridge). The airplane's vertical stabilizer struck the bridge. According to the company's procedures/directives, aircraft larger than the Airbus A320 were not to be taxied beneath the bridge, and the crew had been so advised via dispatch papers. In addition, a cautionary note in the airport taxi chart advised that the bridge provided for 40 foot tail and 117 foot wing clearance.

NTSB factual narrative text:

On March 1, 1997, at 2012 mountain standard time, a Boeing 757-2S7, N902AW, owned by Meridian Trust Company of Reading, Pennsylvania, and operated by America West Airlines, Inc., of Phoenix, Arizona, sustained minor damage when it struck an overhead bridge while taxiing at Denver, Colorado, International Airport. There were no injuries to the two cockpit crew members, 4 cabin crew members, and 95 passengers. Visual meteorological conditions prevailed, and an IFR flight plan had been filed. The airplane was being operated as Flight 491, scheduled domestic passenger service, under Title 14 CFR Part 121. The flight originated at Phoenix, Arizona, at 1819 Pacific standard time.

According to the transcript of control tower communications, the airplane landed on runway 07. At 1952:49, as its landing roll was slowing, the crew was instructed to "turn left at (taxiway) bravo four" and to remain on the tower frequency until entering taxiway "alpha sierra, then contact ramp tower contact ramp control." The crew acknowledged. At 1953:08 the tower controller asked, "You don't normally fly a (Boeing) seven five (seven) in here, do you?" The crew did not answer, and there were no further transmissions between Denver control tower and flight 491.

There was a recording equipment malfunction in the B concourse control tower. As a result, only transmissions from the controller were recorded. According to the transcript, the controller instructed "Cactus 491, (taxi via) alpha sierra to the gate (A-44), sir. Be advised that we've got men in vehicles that are working in that area. They should give way to you but if you have any problems with that commute, give me a call back." The B concourse control tower is manned by airport personnel, not FAA air traffic control (ATC) personnel. According to the assistant deputy manager of aviation, most of the personnel are former military or civilian ATC personnel and have been thoroughly trained in ground operations.

To get to gate A-44 via taxiway alpha sierra, the airplane had to pass beneath an overhead bridge connecting the main terminal building and "A" concourse. As the airplane passed beneath the bridge, its vertical stabilizer struck the bridge, crushing the vertical stabilizer cap and rudder.

The following note appears on the Jeppesen taxi chart: "CAUTION: OVERHEAD PASSENGER BRIDGE ON SOUTH SIDE OF CONCOURSE A PROVIDES 40' TAIL AND 117' WINGSPAN CLEARANCE WHEN ON TAXIWAY CENTERLINES." The following America West NOTAM (Notice to Airmen) was contained in the dispatch release and was given to the flight crew: "757 AIRCRAFT EFFECTIVE 1 MARCH, DO NOT TAXI UNDER THE PASSENGER BRIDGE SOUTH SIDE OF CONCOURSE A."

According to the captain's statement, "it appeared that there was more than adequate clearance for the tail of the aircraft, but I became more concerned with the wingtip clearance from the side support of the bridge rather than the tail clearance."

In his statement the controller on duty in the B concourse control tower wrote, "All I could see was the aircraft's lights and told the aircraft to taxi alpha sierra. I was not expecting a (Boeing) 757 on this flight and did not see the aircraft was a 757."

According to an America West spokesman, this was the first time the airline had used the Boeing 757 on this particular route. They had previously used the Airbus 320. There is adequate clearance for the Airbus 320, but not the Boeing 757, to pass beneath the overhead bridge.
Learning Keywords:Operations - Ground Collision
Consequence - Damage - Airframe or fuselage
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