AD 2008-17-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A318 | Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Series Airplanes Equipped With Certain Northrop Grumman (Formerly Litton) Air Data Inertial Reference Units |
| aircraft | Grumman | Various | Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Series Airplanes Equipped With Certain Northrop Grumman (Formerly Litton) Air Data Inertial Reference Units |
Unsafe Condition
Failure of an ADIRU during flight, which could result in loss of one source of critical attitude and airspeed data and reduce the ability of the flightcrew to control the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace all three ADIRUs with improved ADIRUs. Modify the shelf (floor panel) above ADIRU 3 by installing shims between the shelf and the webs of the shelf support structure. Modify the polycarbonate guard (umbrella) protecting the ADIRUs by installing shims between the guard and the shelf support structure. Modify the ladder located in the avionics compartment for certain airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 2 years after January 27, 2004 (the effective date of AD 2003-26-03)
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Affected Aircraft
Airbus Model A318, A319, A320, and A321 series airplanes, certificated in any category; equipped with at least one Northrop Grumman (formerly Litton) air data inertial reference unit (ADIRU), part number (P/N) 465020-0303-0307, -0308, -0309, -0312, -0314, -0315, or -0316; except airplanes equipped with three ADIRUs having P/N 465020-0303-0316 and on which Airbus Modification 30650 or 30872 has been incorporated in production, or on which Airbus Service Bulletin A320-25-1248 has been applied in service.
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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