Is AD 2008-20-08 a recurring Airworthiness Directive?

Yes — AD 2008-20-08 requires a repetitive inspection every 25 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2008-20-08 apply to?

AD 2008-20-08 applies to Md Helicopters — models 600N. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2008-20-08

recurring

Official AD 2008-20-08 · FR doc E8-23540 · 2008-10-10 · airframe

Airworthiness Directives; MD Helicopters, Inc. Model 600N Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD) for MD Helicopters, Inc. (MDHI) Model 600N helicopters. The AD currently requires modifying the fuselage aft section within the next 24 months to strengthen the tailboom attachment fittings and upper longerons. This amendment retains the current required modification and adds the following requirements: Repetitively inspecting the tailboom attachment fittings; installing inspection holes and attachment bolt washers; modifying both access covers; and replacing broken attachment bolts. These additional requirements were inadvertently omitted from the current AD. This amendment is prompted by the need to correct our mistake and continue the repetitive inspections of the tailboom attachment fittings until the fuselage aft section is modified. This series of ADs is prompted by an accident due to failure of the tailboom attach points resulting in loss of control of the helicopter. The actions specified by this AD are intended to prevent failure of the tailboom attachment fittings, separation of the tailboom from the helicopter, and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 25 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 2008-20-08 applies to

MakesMd Helicopters

Models600N

Serial-conditional — narrows to serials RN003–RN058.

Applies only to helicopters that have not been modified in the fuselage aft section to strengthen the tailboom attachments and longerons per MD Helicopters (MDHI) Technical Bulletin TB600N-007, dated January 12, 2004; TB600N-007, Revision 1, dated April 13, 2006; or TB600N-007, Revision 2, dated October 5, 2006.

Whether AD 2008-20-08 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 2008-20-08 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.