NTSB Identification: CHI05LA238.
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Scheduled 14 CFR operation of AMERICAN TRANS AIR INC
Accident occurred Saturday, August 20, 2005 in Chicago, IL
Probable Cause Approval Date: 06/27/2007
Aircraft: Boeing 757-33N, registration: N557TZ
Injuries: 171 Uninjured.

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

The aircraft sustained substantial damage during a collision with a fence while taxing to runway 22L for takeoff at the Chicago Midway International Airport. The captain stated, "Advised of 9 [minute] delay for release. Maneuvered A/C [aircraft] out of the way of other departing A/C. Went to place A/C in corner west of terminal C; east of hold short line as previously done. Both [captain and first officer] closely monitored the final left turn with respect to aircraft proximity to perimeter fence. Toward end of turn, nose wheel skipped as if crossing wet/slick pavement. ... [Flight attendant] called to state that [a passenger] had said wing had struck the fence." The airplane was found parked by hold short line for runway 22L with its right wing tip in the perimeter fence. The airplane was not on a taxiway centerline. The area was marked as a movement area. Approximately the outboard four foot section of the right wing's leading edge slat was crushed rearward and the slat was imbedded in an I-beam channel that held up the perimeter fence panels there. The I-beams were yellow and the panels were gray in color. A leading edge wing rib was dented, cracked about 1.25 inches, and was bowed. The airport perimeter fence was damaged. The operator's safety recommendation stated, "In addition to providing all of our flight crews with instructions not to enter this area, we conducted a survey of the area and recommend the following: Contact Jeppesen and recommend that the charts for the MDW Airport be revised to show this area as a "Push Back Zone" and note that aircraft should not taxi into any part of the push back zone. I spoke to several crewmembers about this recommendation and the consensus among those interviewed was that a notice on the chart would not be necessary; however, it might alert them to the fact that this is a tight area and should not be used as an alternate holding area. They believe that crews in general should not move off of marked taxi lines under any circumstance and good aviation practices, if observed, would keep this type of event from occurring."

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

The flightcrew's failure to maintain clearance from a fence while taxiing.

Full narrative available

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