[video]
ZitatVideo shot by a passenger aboard American Airlines Flight 2253 as it overran Ruwnay 19 at Jackson Hole, Wednesday, shows unusual operation of the aircraft's systems, according to some pilots. The 6,300 foot runway sits at an elevation of 6,451 feet and the pilots landed in light snow at about 11:37 am. About seven inches of snow had fallen in the area since midnight. The aircraft appears to be on the ground prior to passing the PAPI lights and wind sock. One pilot who commented on pprune.com suggested that places the landing point approximately 1,400 feet down the runway. In the video, the engine's thrust reverser panel first moves just after touch-down, but it does not fully open and the outboard spoilers are not visibly deployed. Because of that, things quickly get more interesting. Click through for the video.
A full ten seconds after touch-down, the thrust reverser panel moves from barely open to closed. The thrust reverser panel does not begin to re-open, this time fully, until approximately seven seconds later, 17 seconds after touch-down. The engines do not appear to spool up until roughly ten seconds after that. That means the 757 rolls on the runway for 27 seconds before the reversers appear amply engaged. It departs the end of the runway roughly nine seconds after that. Pilots who claim to be familiar with the 757 have left comments in professional pilot forums online stating that the thrust reversers on the 757 can sometimes refuse to engage. Others have speculated that a hydraulic problem or a problem with the Boeing's air/ground logic system could have prevented the spoilers and reversers from working properly. For this flight, no one was injured and the aircraft came to rest in packed snow, and still on its gear, about 350 feet beyond the runway overrun area. The NTSB is working the case and should have good cockpit voice and flight data recorder information already in hand. And we'll know if blame will be placed primarily with the crew, with the aircraft, or both.
ZitatAlles anzeigenDecember 31, 2010 - The National Transportation Safety Board has opened an investigation into an incident in which a passenger jetliner that had landed at Jackson Hole Airport in Wyoming failed to stop after touchdown on Thursday.
At about 11:38 AM MT on Thursday, American Airlines Flight 2253, a B-757 (N668AA) inbound from Chicago O'Hare International Airport, ran off the end of runway 19 while landing at Jackson Hole Airport. No injuries were reported among the 181 passengers and crew on board.
The pilot reported that the braking system failed. Flight 2253 continued down the runway, passing the end of the runway and through the runway overrun area which was 300 feet. The aircraft finally came to rest about 350 feet from the overrun area in hard packed snow.
The pilot came on the intercom to reassure passengers that they were ok and stated that the brakes weren’t working properly. Airport officials brought in heavy plows and airport workers began plowing an area around the Boeing 757. A portable staircase and buses were brought in and it took just under an hour before all 181 passengers and crew were able to disembark the aircraft.
Aircraft can and do overrun the ends of runways, sometimes with devastating results. An overrun occurs when an aircraft passes beyond the end of a runway during an aborted takeoff or while landing. To minimize the hazards of overruns, the Federal Aviation Administration (FAA) incorporated the concept of a safety area beyond the runway end into airport design standards called “runway overrun area”.
To meet the standards, the safety area must be capable, under normal (dry) conditions, of supporting the occasional passage of aircraft that overrun the runway without causing structural damage to the aircraft or injury to its occupants. The safety area also provides greater accessibility for emergency equipment after an overrun incident. There are many runways, particularly those constructed prior to the adoption of the safety area standards, where natural obstacles, local development, and/or environmental constraints, make the construction of a standard safety area impracticable.
.......
The weather was reported to be snowing at the time of the incident. No damage to the aircraft has been reported. Senior NTSB Air Safety Investigator Joseph Sedor has been designated as the Investigator-In-Charge. At this time parties to the investigation are American Airlines, Boeing, the Allied Pilots Association and the Federal Aviation Administration.
Prost Neujahr! 
Irre ich mich, oder waren die Spoiler gar nicht draussen?? Hat das Einfluss auf die Reverser?? Sitzen die microswitches in beiden Hauptfahrwerken??
Glück gehabt!
:aetsch:
