Is AD 99-09-20 a recurring Airworthiness Directive?

Yes — AD 99-09-20 requires a repetitive inspection every 150 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-09-20 apply to?

AD 99-09-20 applies to Bell — models 222U, 222. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-09-20

recurring

Official AD 99-09-20 · FR doc 99-10669 · 1999-04-29 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 222, 222B, and 222U Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to BHTC Model 222, 222B, and 222U helicopters. This action requires initial and repetitive visual inspections and verification of the torque of the bolts on the main rotor hub. This amendment is prompted by a report of fatigue cracks around the bolt holes of the main rotor pitch horn (pitch horn) and a cracked main rotor flapping bearing assembly (flapping bearing assembly) on a BHTC Model 222 helicopter. This condition, if not corrected, could result in fretting-induced fatigue cracking of the flapping bearing assembly and around the bolt holes of the pitch horn, loss of the rotor system, and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 150 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 99-09-20 applies to

MakesBell

Models222U, 222

Main rotor flapping-bearing-assembly and pitch-horn fretting/fatigue-cracking inspection AD (visual fretting check, bolt-torque verification); referenced Bell Helicopter Textron Alert Service Bulletin Nos. 222-98-81 and 222U-98-52, both dated April 23, 1998. Cross-referenced to Transport Canada AD CF-98-16.

Whether AD 99-09-20 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 99-09-20 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.