AD NUMBER: 2009-04-07
MANUFACTURER: Airbus
SUBJECT: Airworthiness Directive 2009-04-07
SUMMARY: We are adopting a new airworthiness directive
(AD) for the products listed above. This AD results from mandatory
continuing airworthiness information (MCAI) originated by an
aviation authority of another country to identify and correct an
unsafe condition on an aviation product. The MCAIdescribes the
unsafe condition as: An A330 aircraft experienced a sudden
[uncommanded] nosedown order [event] while in cruise. This order
was preceded by an automatic autopilot disconnection and triggering
of the "NAV IR1 FAULT" Electronic Centralised Aircraft Monitor
(ECAM) Caution. Investigations highlighted that at time of the
event the Air Data Reference 1 (ADR) part of ADIRU1 [Air Data
Inertial Reference Unit] was providing erroneous and temporary
wrong parameters in a random manner. This abnormal behaviour of the
ADR1 led to several consequences such as unjustified stall and over
speed warnings, loss of attitude information on captain Primary
Flight Display (PFD) and several ECAM warnings. Among the abnormal
parameters, the provided Angle of Attack (AoA) value was such that
the flight control computers commanded a sudden nose down aircraft
movement, which constitutes an unsafe condition. * * ** * * * *
These anomalies could result in high pilot workload, deviation from
the intended flight path, and possible loss of control of the
airplane. This AD requires actions that are intended to address the
unsafe condition described in the MCAI.
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