Is AD 99-07-17 a recurring Airworthiness Directive?

No — AD 99-07-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-07-17 apply to?

AD 99-07-17 applies to Robinson — models R22. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-07-17

one-time

Official AD 99-07-17 · FR doc 99-9131 · 1999-04-13 · airframe

Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 99-07-17 which was sent previously to all known U.S. owners and operators of Robinson Helicopter Company (RHC) Model R22 helicopters by individual letters. This AD requires, before further flight, inserting a Special Pilot Caution into the Normal Procedures section of the Rotorcraft Flight Manual (RFM). This amendment is prompted by several reports of sprag clutch assemblies with cracked or fractured sprag ends. The sprag clutch failures, determined to be due to a change in the manufacturing process, could result in loss of main rotor revolutions-per-minute (RPM) during autorotations. The intent of this AD is to alert pilots of the potential for the sprag clutch failing to overrun during autorotation, loss of main rotor RPM, and subsequent loss of control of the helicopter.

Which aircraft AD 99-07-17 applies to

MakesRobinson

ModelsR22

Sprag clutch autorotation-overrun caution AD; requires inserting a Special Pilot Caution into the Rotorcraft Flight Manual regarding cracked sprags potentially failing to overrun; per Robinson Helicopter Company R22 Service Bulletin SB-85, dated March 22, 1999.

Whether AD 99-07-17 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 99-07-17 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.