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Airworthiness Directive 99-06-06

recurring
Official AD 99-06-06 · FR doc 99-5992 · 1999-03-12 · airframe

Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes Equipped With General Electric CF6-80C2 Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A310 and A300-600 series airplanes, that requires repetitive flow checks of the hydraulic pump drain system to ensure that the system is not clogged, and correction of any discrepancy. This amendment also requires replacement of the existing magnetic seals of the accessory gearbox assembly with new, improved seals. Replacement of certain seals terminates the requirement for repetitive flow checks. This amendment also requires replacement of the engine drain modules with drain manifolds. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent contamination of the engine accessory gearbox oil with hydraulic fluid, which could result in an in-flight engine shutdown.

Repetitive inspection. Re-inspect every 500 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 99-06-06 applies to

MakesAirbus
ModelsA310, A300-600

Applies to A310 and A300-600 series airplanes on which Airbus Modification 8952 has not been installed; corrective actions per Airbus SB A310-72-2020 Rev 2 (flow check) and SB A310-72-2017 Rev 3 (seal replacement, terminating action) for A310, and SB A300-72-6016 Rev 2 / SB A300-72-6013 Rev 3 for A300-600.

Whether AD 99-06-06 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 99-06-06 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.