AD 2009-04-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A330-200 and -300 | Airworthiness Directives; Airbus Model A330-200 and -300 Series Airplanes, and Airbus Model A340-200, -300, -500, and -600 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Model A330-200 and -300 Series Airplanes, and Airbus Model A340-200, -300, -500, and -600 Series Airplanes |
Unsafe Condition
An A330 aircraft experienced a sudden uncommanded nose down order while in cruise, preceded by an automatic autopilot disconnection and triggering of the 'NAV IR1 FAULT' ECAM Caution. Investigations revealed that the Air Data Reference 1 (ADR) part of ADIRU1 was providing erroneous and temporary wrong parameters, including an incorrect Angle of Attack (AoA) value, leading to flight control computers commanding a sudden nose down aircraft movement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Aircraft Flight Manual (AFM) operational procedure to instruct flight crews to de-energize the affected ADIRU by setting the IR mode rotary selector to OFF if the 'OFF' light does not illuminate after setting the IR and ADR pushbuttons to OFF. Additionally, ensure that the ADIRU is de-energized by setting the IR mode rotary selector to OFF even if the 'OFF' light illuminates after setting the IR and ADR pushbuttons to OFF.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Model A330-200 and -300 Series Airplanes, and Airbus Model A340-200, -300, -500, and -600 Series Airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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