Is AD 2011-22-08 a recurring Airworthiness Directive?

No — AD 2011-22-08 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2011-22-08 apply to?

AD 2011-22-08 applies to Mdhi — models MD900. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2011-22-08

one-time

Official AD 2011-22-08 · FR doc 2011-28897 · 2011-11-08 · airframe

Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD) that applies to MD Helicopters, Inc. (MDHI) Model MD900 helicopters. That AD currently requires turning ON both Vertical Stabilizer Control System (VSCS) switches and turning OFF the autopilot (AP/SAS) switch; pulling certain AP/SAS circuit breakers; installing a placard near the AP/SAS master switch; installing an airspeed limitation placard on the instrument panel; and making changes to the Rotorcraft Flight Manual (RFM). This amendment retains those requirements and provides an option of replacing each affected tube adapter with a newly-designed tube adapter, which provides terminating action for the unsafe condition. This amendment is prompted by the manufacturer introducing an improved, newly-designed tube adapter. 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 2011-22-08 applies to

MakesMdhi

ModelsMD900

Part-conditional — 500N7218-1.

Applies only to helicopters with a Vertical Stabilizer Control System (VSCS) tube adapter P/N 500N7218-1 installed.

Whether AD 2011-22-08 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 2011-22-08 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.