AD 2011-02-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A330-200 | Airworthiness Directives; Airbus Model A330-200 Series Airplanes; Model A330-300 Series Airplanes; Model A340-200 Series Airplanes; and Model A340-300 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Model A330-200 Series Airplanes; Model A330-300 Series Airplanes; Model A340-200 Series Airplanes; and Model A340-300 Series Airplanes |
Unsafe Condition
When there are significant differences between all airspeed sources, the flight controls of an Airbus A330 or A340 aeroplane will revert to alternate law, the autopilot (AP) and the auto-thrust (A/THR) automatically disconnect, and the Flight Directors (FD) bars are automatically removed. If two airspeed sources become similar while still erroneous, the flight guidance computers may display FD bars again and enable autopilot and auto-thrust re-engagement, which may result in inappropriate autopilot orders such as possible abrupt pitch command.
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Required Actions
Revise the limitations and abnormal sections of the airplane flight manual to include a procedure for when the autopilot and auto-thrust are automatically disconnected and flight controls have reverted to alternate law.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Model A330-200 Series Airplanes (A330-201, -202, -203, -223, -223F, -243, -243F), Model A330-300 Series Airplanes (A330-301, -302, -303, -321, -322, -323, -341, -342, -343), and Model A340-200 Series Airplanes (A340-211, -212, -213), and Model A340-300 Series Airplanes (A340-311, -312, -313), all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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