Is AD 97-23-06 a recurring Airworthiness Directive?

No — AD 97-23-06 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 97-23-06 apply to?

AD 97-23-06 applies to Schweizer. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 97-23-06

one-time

Official AD 97-23-06 · FR doc 97-29237 · 1997-11-05 · airframe

Airworthiness Directives; Schweizer Aircraft Corporation Model 269A, A-1, B, and C, and TH-55A Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Schweizer Aircraft Corporation Model 269A, A-1, B, and C, and TH-55A helicopters, with a certain main rotor transmission ring gear (ring gear) installed, that requires inspections of the ring gear teeth for surface deterioration which includes pitting, excessive wearing, cracking or corrosion, and replacement of the ring gear if such ring gear teeth surface deterioration is found; and also requires creating a main rotor transmission component log card (log card), if none is available, and making a notation on the log card if a ring gear is changed. This amendment is prompted by reports of failures of the ring gear due to single tooth distress as a result of improper gear tooth spacing during the manufacturing of the ring gear. The actions specified by this AD are intended to prevent failure of the ring gear, loss of drive to the main rotor gearbox, and a subsequent forced landing.

Which aircraft AD 97-23-06 applies to

MakesSchweizer

Part-conditional — 269A5104-7, 269A5104-5.

Main rotor transmission ring gear inspection/replacement per Schweizer Service Bulletin B-244.2 (Feb 19, 1996); ring gear P/N 269A5104-5 (mfr code 23751/EGC or 57152/ACR) replaced with P/N 269A5104-7, S/N S2100 or higher, is terminating action. Specific helicopter model not named in extracted text.

Whether AD 97-23-06 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 97-23-06 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.