Autoland Crash2
New Info 8/29/06:
Here's another explanation,
sent in by T. Field, an airbus pilot,
explaining why this crash had nothing to do with the "autoland" system.
"Advancing the thrust levers all the way forward
(to TOGA) will disconnect autothrust and command full thrust manually. There
are no go-around switches at all on the Airbus FBW aircraft (A320's, 330,
340 or 380), nor has there ever been."
"Proper procedure in case of a go-around is
simply to push the thrust levers all the way forward, and that's it! The
autothrust system will never ignore this command due to a bugged speed or
anything else."
"And there is no such thing as 'landing mode'
within the autothrust system. The airfield at Habsheim, has no navaids
whatsoever, let alone an ILS which is required to perform an autoland. The
Airbus aircraft, past or present, can only perform an autoland if there is
an ILS without localizer offset available, same as any other aircraft with
autoland capability from other manufacturers."
"The Airbus in question did not have a magical
autoland feature that would enable it to perform an autoland at Habsheim, an
there is no way the flight crew could inadvertently engage any type of
autoland feature. This fly-by was flown MANUALLY and with MANUAL THRUST.
This was Capt. Asseline's testimony in court, and it was confirmed by
readouts of the flight data recorder and also by the callouts made and
recorded by the cockpit voice recorder. It is also confirmed that they
eventually did advance the thrustlevers forward and that this gave the
TOGA/SRS response, but by that time it was simply too late."
"This accident has absolutely NOTHING AT ALL to
do with a failed autoland attempt, nor a problem with the aircraft being in
'a landing mode'."
Here's another
explanation of this crash, sent in by viewer Chris Hahn::
"The third entry in the Test Flights section is
the A320 Mullhouse Habsheim crash, the alternate version is also way wrong.
The pilot, not the computers, put that aircraft in the trees.
That dubbed tape is a criminal misrepresentation of the facts.
The aircraft was being flown by an experienced Air France pilot -- he was
not inexperienced on the type. It is inconceivable that a pilot with
insufficient experience on the aircraft would be allowed to fly at an
airshow.
He had disabled some of the safety systems to
allow him to fly low and slow without the aircraft taking over and flying
up. He briefed to remain higher than 100 feet as he flew over the runway.
As he is still descending on idle power the copilot says something like "the
trees" and the pilot acknowledges but doesn't take action to increase power
and altitude.
On some versions of the tape you can actually
hear the engines start to accelerate just before they start ingesting the
trees. Some recordings also have a popping sound which may be a compressor
stall. The flight data recorders appear to have been tampered with, at the
very least the trail of evidence was broken.
Wikipedia does a good job of covering the facts and the subsequent
accusations.
The pilot, not the computers, put that aircraft in the trees.
Unfortunately the adulterated and dishonest TLC video has spread like a
disease."
Another Explanation, From Paul, an A320 Pilot:
"Hey there - great website! I've been flying the A320 for 10 years and would
like to add a third (or is it 4th?) clarification."
"The Airbus has a safety feature called Alpha Floor/Toga Lock that
normally commands full power and limits the maximum angle of attack (called
Alpha Max) as it a approaches a stall. This feature would normally allow you
to simply pull back on the stick and the computer would command full power
and allow the aircraft to climb out just below the stall AOA."
"The reason there was no power increase ( and no pitch up ) in this
accident was because this feature does not exist below 100 feet, otherwise
it might add full power in the landing flare, which is not a good thing. So
if the flyby had been done above 100 feet radio altitude, it would have
worked just fine."
"Hindsight being 20/20, if the pilots could have recognized it earlier
and pushed the throttles forward to the stops, they could have climbed out.
Its really a case of an engineering safety feature being relied on when it
really didn't exist!" |