CASA AD: AD/A320/166 Manufacturer: Airbus Subject: Elevator and Aileron Computer Applicability: A320 all certified models, all
manufactured serial numbers, except aircraft that have incorporated
Airbus modification 33317 during production or Airbus Service
Bulletin A320-27-1149 whilst in service.
Requirement: Amend the Minimum Equipment List
(MEL) by inserting Temporary Revision (TR) TR No 01-27/01H issue 01
of the Master Minimum Equipment List (MMEL) A318/A319/A320/A321
that introduces the operational limitation "Above FL 200, the use
of speed brakes lever is limited to its half position" when the
aircraft is under MMEL ELAC 1. Later revisions of the above
document approved by the DGAC are acceptable for compliance with
this Directive. Note: DGAC AD F-2005-013 (EASA Approval 2005-496)
refers. Summary: The Direction G�n�rale de
l'Aviation Civile of France has advised that during investigations
on an A320 airplane the following critical flight phase was
evident: When the aircraft is under MMEL with ELAC 1 (Elevator and
Aileron Computer) inoperative or ELAC 1 PITCH FAULT cautions
displayed, the loss of SEC 1 (Spoiler and Elevator Computer) in
descent when speed brakes are deflected will lead to: - the
automatic retraction of speed brakes 3 and 4, - the loss of the
double hydraulic pressurization on elevators. In manual mode and at
high speed, the retraction of speed brakes 3 and 4 from their full
extended position will induce a pitch down effect that cannot be
counteracted by the elevator controlled by a single actuator
causing the aircraft to pitch down and accelerate.
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