Is AD 2008-21-10 a recurring Airworthiness Directive?

No — AD 2008-21-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2008-21-10 apply to?

AD 2008-21-10 applies to Eurocopter — models AS332C, AS332L, AS332L1, AS332L2, AS332. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2008-21-10

one-time

Official AD 2008-21-10 · FR doc E8-24987 · 2008-10-31 · airframe

Airworthiness Directives; Eurocopter France Model AS332 C, L, L1 and L2 Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for the specified Eurocopter France (ECF) model helicopters. This AD results from mandatory continuing airworthiness information (MCAI) originated by the aviation authority of France to identify and correct an unsafe condition on an aviation product. The aviation authority of France, with which we have a bilateral agreement, states in the MCAI: "This Airworthiness Directive (AD) is issued following two cases of LH hydraulic power system loss on two AS332 helicopters. In both cases, the pilot received the "low level" hydraulic failure alarm. The investigations conducted on the two helicopters revealed a hydraulic fluid leak from the hydraulic pump casing. In both cases, incorrect position of the liner of the compensating piston had caused the seals to deteriorate. This incorrect positioning of the liner is due to non- compliant application of the repair process by a repair station. Deterioration of hydraulic pumps causes: <bullet> The loss of the RH and LH hydraulic power systems in the event of a substantial hydraulic fluid leak from both hydraulic pumps during a given flight. <bullet> The loss of the hydraulic system concerned, in the event of a substantial hydraulic fluid leak from only one pump." This AD requires actions that are intended to address this unsafe condition.

Which aircraft AD 2008-21-10 applies to

MakesEurocopter

ModelsAS332C, AS332L, AS332L1, AS332L2, AS332

Part-conditional — C24160-X, C24160-XXX, C241600XX, C241600XX-X, C241600XX-XXX.

Applies only to helicopters with a Messier-Bugatti hydraulic pump (P/N series C24160-X, C24160-XXX, C241600XX, C241600XX-X, or C241600XX-XXX) installed, where the pump serial number lacks the suffix letter 'V' (V denotes conformance to approved design data), as listed in Eurocopter France Emergency Alert Service Bulletin 01.00.73 dated August 23, 2007.

Whether AD 2008-21-10 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 2008-21-10 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.