NYTimes.com Article: '97 Memo Cited in '01 Queens Airliner Crash

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'97 Memo Cited in '01 Queens Airliner Crash

October 12, 2004
 By MATTHEW L. WALD





WASHINGTON, Oct. 11 - An airplane manufacturer's memo
written in June 1997 explicitly describes the hazards of
the maneuver that caused the November 2001 crash of an
American Airlines plane in Belle Harbor, Queens, but the
memo was kept within the company, and the pilot was never
warned about the procedure.

American Airlines obtained the memo a few months ago from
the manufacturer, Airbus, as part of its suit over how the
companies will share the payments to the families of the
265 people killed in the crash of Flight 587. The memo is
now being cited by American and the pilots' union in an
effort to put part of the blame on Airbus.

The maneuver involved swinging the rudder from side to
side, and the memo, written after a 1997 episode with a
different American Airlines flight in the same kind of
plane, an A300, warns that it could cause the tail to break
off. That is what happened to Flight 587.

After the crash, the National Transportation Safety Board
issued a recommendation against the maneuver. If Airbus had
shown the memo to the board before the crash, "instead of
concealing it from them, the N.T.S.B. would have issued the
recommendation before the crash," said John A. David, an
American Airlines pilot who is the chief representative of
the union, the Air Line Pilots Association, in the
investigation.

Clay McConnell, a spokesman for Airbus, said that at the
time the memo was written, Airbus was not a party to the
investigation of the first event, and that when it did
join, it was involved with crew performance, not structural
issues.

The memo, from a German member of the Airbus consortium,
Daimler-Benz Aerospace, said that "rudder movements from
left limit to right limit will produce loads on the
fin/rear fuselage above ultimate design load" - the amount
of force that a part is designed to handle without
breaking.

The memo's main point was that the tail of the plane in the
1997 event should be inspected. It was, and no damage was
found, but it was reinspected more thoroughly after the
2001 crash, when some problems were found.

In the Flight 587 crash, the co-pilot, flying the plane,
moved the rudder back and forth when it encountered the
wake of a plane that had taken off 140 seconds earlier from
Kennedy International Airport. Pilots are warned not to use
the rudder above a certain speed, which varies by airplane,
but Flight 587 was still below that speed. They were not
warned, until after the crash, never to use the rudder in
alternating directions.

The safety board warning went to all jet airliner pilots,
and experts say that the A300 is no more vulnerable to this
maneuver than many other planes. Separately, however, the
airline is arguing that a system called the "rudder
limiter," which keeps a pilot from moving the rudder
farther than is safe at the airplane's speed, does not work
well on the A300.

The safety board has scheduled a meeting for Oct. 26 to
establish the probable cause of the crash. Under its
charter from Congress, the board finds probable cause, not
fault, but its findings could influence the outcome of the
litigation between the airline and the plane manufacturer.

The union and the airline are contending that in an era of
very few passenger airline crashes, reducing the accident
rate further will require that all elements of the industry
volunteer any information they have on any potential safety
problem.

In the 1997 episode, the crew of an American airlines plane
near West Palm Beach, Fla., mismanaged the controls and
allowed airspeed to fall too low. When the plane slowed
down to the point that it could not stay in the air, the
crew performed a sloppy recovery but averted a crash. But
the investigation focused on the initial error and the poor
recovery, and not the rudder issue.

Mr. McConnell of Airbus said his company had stressed to
American after the 1997 event that pilots should not use
the rudder in recovering stability.

"If the pilots didn't know it, it isn't for our lack of
trying," he said. He acknowledged that the advice concerned
not using the rudder, and not the more specific case of
using the rudder in alternating directions. But, he said,
"there is no good piloting reason to use alternating
rudder, none, in the history of aviation."

http://www.nytimes.com/2004/10/12/nyregion/12crash.html?ex=1098590696&ei=1&en=c780e430141cfcfa


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