Is AD 2008-22-52 a recurring Airworthiness Directive?

No — AD 2008-22-52 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2008-22-52 apply to?

AD 2008-22-52 applies to Md Helicopters — models 500N, 600N. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2008-22-52

one-time

Official AD 2008-22-52 · FR doc E8-28110 · 2008-11-28 · airframe

Airworthiness Directives; MD Helicopters, Inc. Model 500N and 600N Helicopters

What this AD requires

This document supersedes AD 2008-18-52 and publishes in the Federal Register an amendment adopting Emergency Airworthiness Directive (AD) 2008-22-52 which was sent previously to all known U.S. owners and operators of MD Helicopters, Inc. (MDHI) Model 500N and 600N helicopters by individual letters. This AD requires turning OFF the Yaw Stability Augmentation System (YSAS); installing a placard that limits airspeed to 100 KTS or V<INF>NE</INF>, whichever is less; and revising the limitations section of the Rotorcraft Flight Manual (RFM) to reflect that limitation. Finally, replacing the adapter tubes with airworthy adapter tubes that have a production date code stamp is required. This AD is prompted by several occurrences of failed adapter tubes on the Model MD900 helicopter which uses the same adapter tubes. The actions specified by this AD are intended to prevent loss of yaw control and subsequent loss of control of the helicopter.

Which aircraft AD 2008-22-52 applies to

MakesMd Helicopters

Models500N, 600N

Part-conditional — 500N7218-1.

Applies only when a Yaw Stability Augmentation System (YSAS) adapter tube, part number 500N7218-1, is installed; adapter tubes that have a production date code stamp are excluded from applicability.

Whether AD 2008-22-52 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 2008-22-52 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.