AD 97-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus SAS | A300 B4-620 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
| aircraft | Airbus SAS | A300 B4-622R | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
| aircraft | Airbus SAS | A310-221 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
| aircraft | Airbus SAS | A310-222 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
| aircraft | Airbus SAS | A310-322 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
| aircraft | Airbus SAS | A310-324 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
| aircraft | Airbus SAS | A310-325 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped with Pratt & Whitney Turbofan Engines |
Unsafe Condition
Clogging of the hydraulic pump drain system could cause failure of the seal of the hydraulic pump shaft and subsequent contamination of the engine accessory gearbox oil, which could result in an in-flight engine shutdown.
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Required Actions
Perform a flow check of the hydraulic pump drain system within 30 days after the effective date and correct discrepancies before further flight. Repeat flow checks every 500 flight hours until the seal replacement is done. Replace the existing seal of the green hydraulic system gearbox within 12 months using specified service bulletins.
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Compliance Time
Within 30 days after the effective date (for initial flow check) and within 12 months after the effective date (for seal replacement). Repeat flow checks at intervals not exceeding 500 flight hours.
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Affected Aircraft
Airbus Model A300B4-620, -622, -622R, A300C4-620, A310-221, -222, -322, -324, -325 series airplanes equipped with Pratt & Whitney turbofan engines where Modification 10399 or 10400 has not been accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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