AD 2001-03-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A330 and A340 | Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes |
Unsafe Condition
Simultaneous failure of two air pressurization units, which could result in loss of three hydraulic circuits and consequent reduced controllability of the airplane.
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Required Actions
Within 500 flight hours after the effective date, perform a detailed visual inspection to determine the part number (P/N) and serial number (S/N) of the pressure reducing valve on each air pressurization unit. If any P/N or S/N is identified as affected, perform applicable tests and repairs prior to further flight. As of the effective date, do not install any air pressurization unit having P/N 4020 Q8-3 unless all actions have been accomplished in accordance with the AD.
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Compliance Time
Within 500 flight hours after the effective date
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Affected Aircraft
Airbus Model A330 and A340 series airplanes, certificated in any category, fitted with any air pressurization unit having part number (P/N) 4020 Q8-3.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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