Tue, Oct 25, 2011
NTSB Releases Transcript Of CVR In Runway Excursion
The NTSB late last week released the Cockpit Voice Recorder
transcript from American Airlines flight 2253, which overran runway
19 upon landing at Jackson Hole Airport in Wyoming (KJAC) on
December 29, 2010.
Preliminary reports indicate that the airplane came to rest
approximately 350 feet past the runway overrun area. There were no
injuries to the 179 passengers and 6 crew on board, and preliminary
reports indicate that the airplane was undamaged. Passengers were
deplaned using airstairs, and the airplane was towed to the ramp
and secured for further examination. A solid-state cockpit voice
recorder (CVR) was sent to the National Transportation Safety
Board’s Audio Laboratory for readout. The CVR group meeting
convened on January 4, 2011 and a partial transcript was prepared
for a 2 minute 3 second portion of the recording 46 minutes 22
seconds before the end of the recording. Additionally, a transcript
was prepared for the final 31 minutes 3 seconds of the 2-hour 4
minute 31 second digital recording.
During the approach, controllers told the aircrew that a
Challenger had reported that the braking action on the first two
thirds of the runway were good, but classified it as "poor" on the
last third. A departing Pilatus reported bases as 6,900 feet, trace
rime ice from 13,000 to 15,000 and negative turbulence in the
climb. The flight crew told the controller to expect to see them
braking hard on the first third of the runway after landing.
Just after touchdown, the first officer says "no reverse," in
what the investigators indicated was a voice that was "strained."
The flight crew did what they could to slow the 757 down, but wound
up going off the end of the runway and through the overrun area.
Fortunately, when the airplane came to a stop, no one was injured
and the passengers were able to deplane using airstairs.
A factual report released previously indicated that there had
been a significant buildup of ice within the reverser assemblies of
both engines. Investigators are also looking at the airplane's
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