Is AD 99-22-01 a recurring Airworthiness Directive?

Yes — AD 99-22-01 requires a repetitive inspection every 15 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-22-01 apply to?

AD 99-22-01 applies to Eurocopter Deutschland Gmbh — models EC135 P1, EC135 T1, EC135. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-22-01

recurring

Official AD 99-22-01 · FR doc 99-30623 · 1999-12-02 · airframe

Airworthiness Directives; Eurocopter Deutschland GmbH Model EC135 P1 and T1 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 99-22-01, which was sent previously to all known U.S. owners and operators of Eurocopter Deutschland GmbH (ECD) Model EC135 P1 and T1 helicopters by individual letters. This AD requires, before further flight and at specified time intervals until a modified tail boom connecting frame flange (frame flange) is installed, inspecting and replacing, if necessary, the frame flange. This AD also requires, within 7 days, installing an additional bearing support on the frame flange. Thereafter, this AD requires visually inspecting the frame flange for cracks or misalignment of the slippage marks at specified time intervals. This amendment is prompted by the discovery of a crack in the frame flange at the attachment points of the tail rotor drive shaft bearing support. The actions specified by this AD are intended to prevent a fracture of the bearing frame flange, failure of the tail rotor drive shaft, and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 15 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 99-22-01 applies to

MakesEurocopter Deutschland Gmbh

ModelsEC135 P1, EC135 T1, EC135

Serial-conditional — narrows to serials 0005–0120.

Whether AD 99-22-01 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 99-22-01 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.