• The Telex Airbus (English)
Airbus on Monday delivered a warning, a Flight Operations Telex, as revealed by the Echo on Tuesday to all its client companies. This relates to the Airbus A 330 and A 340, on which the device was operated flight AF 447, and reset the autopilot in the cockpit after an icing Pitot probes (for measuring the speed of the aircraft ), a phenomenon supposed to be the cause of the tragedy of June 1, 2009.
When the Pitot probe frosting and send wrong information to the cockpit for speed, the autopilot disengages and drivers should continue to fly the aircraft until the problem stops, the velocity information from the three probes are consistent , and so the autopilot can be reset.So far, the reflections on the disappearance of the AF 447 were on the way the pilots suddenly recovered the aircraft flight manual, night, in full crossed areas of cumulonimbus.
Telex Airbus says companies that, when two of the three pitot probes send erroneous information, if such information is almost identical, they can be considered valid by the onboard computer of the aircraft. The artificial horizon (the Flight Director) who had disappeared from the screen reappears and the drivers will be tempted to put the autopilot on and then summon the device to fly with false information. "If the sensors indicate a speed of 100 knots below that of the camera, the camera takes a blow when the driver is reset," said one expert interviewed by Le Figaro. In this case, the autopilot puts the gas and put the stick back.The aircraft pitched up in hand. Stall and a plane falling to the ground are then quite possible. "The pilot can recover the aircraft, said an aviation expert but must know that at this altitude, one pilot on a needle with an air density very low."
This scenario will be validated only if the fourth round of the FA Research 447, which begins in February, managed to recover the black boxes of the device.For the moment, the only messages received Acars of the aircraft shortly before his death, can not say whether the pilot was or was not reset by the pilot of Air France.
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FROM: AIRBUS CUSTOMER SERVICES TOULOUSE
TO: ALL A330/A340 GE CFM PW RR OPERATORS
FLIGHT OPERATIONS TELEX – FLIGHT OPERATIONS TELEX
OUR REF. : 999.0112/10 dated 20 December 2010
Subject: ATA 22 and 34 – Loss of AP and A / THR Associated with alternate
Law reversion
CLASSIFICATION: Airworthiness
Notice: This FOT Provides information about a "significant Operational
That Is outcome related to safety or airworthiness guaranteed approval cash advance loans.It Is EACH Operator's
Responsibility to distribute or to distribute this FOT The information
Contained in this FOT, applicable to all of Their flight crews Without
delay. Failure to apply "this FOT May Have A Significant Impact are safe
aircraft operations.
This FOT & the EPO advance copies Will Be available in pdf format
in AirbusWorld Within Two Days.
1. PURPOSE
The purpose of this FOT Is To recommend The Flight Crew to check
airspeed indications Before Engaging the autopilot, When in alternate
law.
2.EXPLANATION
When There Are Significant Differences Between airspeed all sources
The flight controls revert to alternate Law, the autopilot (AP) & the
autothrust (A / THR) Automatically disconnect, & the Flight Directors
(FD) Automatically bars are removed.
It has Been Identified That, after year Such events, if airspeed Two
Become stills similar sources while erroneous, The flight guidance
computers:
– Display FD bars again.
– Enable autothrust autopilot and re-engagement.
However, In Some boxes, tea orders autopilot May Be Inappropriate, Such
as possible steep pitch command.
Therefor, The flight crew must Apply THE FOLLOWING PROCEDURE.
3.OPERATIONAL RECOMMENDATIONS
When autopilot disconnected and autothrust are Automatically and flight
Have controls reverted to alternate law:
– Do not commits the Ap and the A / THR, Even If Have FD bars
reappeared
– Do not Follow the orders FD
– ALL INFORMATION ……………………………….. X-SPEED CHECK
* If speed unreliable indication Suspected IS:
– Unreliable SPEED INDIC / ADR CHECK PROC APPLY ………..
* If at least Two ADRs Provide reliable speed indication for any
least 30 seconds, & the aircraft stabilised IS On The Intended
path:
– AP / FD and A / THR ……………………………….. As required.
4. CORRECTIVE ACTION
This Procedure Will Be The Next canceled by FCPC standards That Will Be
Before available end 2011.
Will this change in commitment inhibit autopilot The Above
Described situation.
5.FOLLOW-UP
For A330 aircraft, thesis Operational Recommendations Will Be Issued by
Beginning of January 2011 in red EPO 82 / 1 and Its Associated EPO PROC
82 / 1 In The QRH.
For A340-200/-300 aircraft, thesis Recommendations Will Be Operational
Issued January 2011 Beginning of EPO in red 95 / 1 and Its Associated EPO
PROC 95 / 1 In The QRH.
No Specific follow-up to this Planned IS FOT.