AD 97-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A330-301 | Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes |
| aircraft | Airbus | A340-211 | Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes |
| aircraft | Airbus | A340-212 | Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes |
| aircraft | Airbus | A340-311 | Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes |
| aircraft | Airbus | A340-312 | Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes |
Unsafe Condition
Water accumulation in the Air Data/Inertial Reference Unit (ADIRU) trays due to operation of the avionics ground refrigeration unit (GRU) in high ambient humidity, which can result in ADIRU failure and loss of air data and navigational information.
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Required Actions
Deactivate the avionics ground refrigeration unit (GRU) in accordance with Airbus All Operators Telex (AOT) 21-01. To reactivate GRU, modify the avionics equipment ventilation system per Airbus Service Bulletins A330-21-3028 and A340-21-4046.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Model A330-301, A340-211, A340-212, A340-311, A340-312 airplanes equipped with avionics ground refrigeration unit (GRU).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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