Is AD 2001-20-18 a recurring Airworthiness Directive?

No — AD 2001-20-18 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-20-18 apply to?

AD 2001-20-18 applies to Robinson — models R44. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-20-18

one-time

Official AD 2001-20-18 · FR doc 01-25693 · 2001-10-15 · airframe

Airworthiness Directives; Robinson Helicopter Company Model R44 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for Robinson Helicopter Company (RHC) Model R44 helicopters that requires establishing a life limit of 2200 hours time-in-service (TIS) for affected horizontal stabilizers. This amendment is prompted by engineering analysis which indicates that certain vertical-to- horizontal stabilizer attach channels (channels) will crack sooner than the original life limit of the horizontal stabilizer. The actions specified by this AD are intended to prevent a crack through a channel, separation of the stabilizers, and subsequent loss of directional control of the helicopter.

Which aircraft AD 2001-20-18 applies to

MakesRobinson

ModelsR44

Serial-conditional — narrows to serials 0009–0224.

Part-conditional — C044-1.

Applies only when horizontal stabilizer assembly P/N C044-1 with S/N 0009 through 0224 is installed, EXCLUDING S/N 0018, 0090, 0094, 0111, 0129, 0144, 0161, 0178, 0201, and 0223.

Whether AD 2001-20-18 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 2001-20-18 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.