January 1, 2011 - In its continuing investigation of the
runway overrun of a jetliner in
about 11:38 am MT on Wednesday, December 29, American
Flight 2253, a B-757-200 (N668AA) inbound from
Chicago O'Hare International Airport, ran off the end of
runway 19 in snowy conditions while landing at
The aircraft came to rest in hard packed snow about 350 feet beyond the runway overrun area. An initial inspection did not reveal any structural damage to the aircraft.
Shortly after the aircraft came to a stop, in accordance with American Airlines' procedures, the pilots pulled the circuit breaker to the cockpit voice recorder (CVR) to preserve all of the recorded information for investigators. The CVR and DFDR (digital flight data recorder) arrived at the Safety Board's recorder laboratory on Thursday evening, Dec. 30, where investigators were standing by to download the contents of both recorders.
provided a two-hour recording of excellent quality audio; the
voices of each of the pilots on the flight deck were clearly
audible. The DFDR provided 1200 recorded parameters of flight
data and captured the entire incident. The crew, who were
interviewed on Thursday evening, indicated that they saw the
runway prior to reaching the minimum descent altitude before
touchdown. Both crewmembers characterized the flight and
approach to landing as uneventful prior to the runway overrun.
The first officer was the flying pilot.
accident docket, which will contain additional factual
information, is expected to be opened in 60-90 days. It will be
available on the docket section of the NTSB
website. Protocols for
transporting aircraft recorders in incident investigations - The
Safety Board has long-established protocols for the handling and
transportation of CVRs and DFDRs that contain recorded
information from a commercial aviation incident, which by
definition is one where no serious injuries or substantial
damage to the aircraft or other property has occurred.
In such incident
investigations, the Safety Board frequently asks the airline involved to
transport the recorders on their own aircraft as such an arrangement
often provides the most expeditious means of conveying the devices to
Safety Board labs in
This practice has
worked efficiently and without complication for more than 40 years.
During this incident investigation, the Safety Board learned that the
recorders were flown to
thorough examination by our investigators determined that no information
from the DFDR was missing or altered in any way, the breach of protocol
by American Airlines personnel violates the Safety Board's standards of
conduct for any organization granted party status in an NTSB
investigation," said NTSB Chairman Deborah A.P. Hersman. "Because
maintaining and enforcing strict investigative protocols and procedures
is vital to the integrity of our investigative processes, we have
revoked the party status of American Airlines and excused them from
further participation in this incident investigation."
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