AD 2020-22-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS332C1 and AS332L1 | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
The affected helicopters use the same ``flight/ground'' logic signal instead of independent redundant signals. If both AHRS incorrectly receive ``ground'' status in flight, as a result for instance of a single failure, this will generate consistent erroneous computation of the attitudes and vertical speed during helicopter maneuvers with consequent incorrect flight data indications to the flight crew on both primary displays. Erroneous flight information could lead to increased workload for the flight crew when the upper modes of the automatic flight control system are not engaged, possibly resulting in reduced control of the helicopter during high speed maneuvers in instrumental meteorological conditions (IMC).
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Required Actions
Amend the emergency procedures of the existing rotorcraft flight manual (RFM) for your helicopter, a wiring modification of the ``flight/ground'' logic signal source of the attitude and heading reference system (AHRS) 1, and then removal of the amendment to the existing RFM for your helicopter.
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Compliance Time
Within 100 hours time-in-service or before intentional flight into IMC, whichever occurs first.
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Affected Aircraft
Airbus Helicopters Model AS332C1 and AS332L1 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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