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Airworthiness Directive 99-17-10

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Official AD 99-17-10 · FR doc 99-21177 · 1999-08-18 · airframe

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

What this AD requires

This amendment adopts a new airworthiness directive (AD) applicable to Schweizer Aircraft Corporation (SAC) Model 269A, 269A-1, 269B, 269C, 269C-1, and 269D helicopters. This action requires inspecting the tail rotor swashplate shaft (shaft) nut for looseness and, if loose, inspecting the shaft for proper size; subsequently inspecting the shafts not previously inspected; and replacing any undersized shaft prior to further flight. This amendment is prompted by the discovery of an undersized replacement shaft during routine maintenance. The actions specified in this AD are intended to prevent failure of the shaft and subsequent loss of control of the helicopter.

Which aircraft AD 99-17-10 applies to

MakesSchweizer Aircraft Corp.
Part-conditional — 269A6258, 269A6049-3.

Applies to helicopters with pitch control shaft P/N 269A6049-3 and shaft nut P/N 269A6258. Repetitive inspection of the shaft nut for looseness every 10 hr TIS; if loose, determine if shaft is undersized per Schweizer Aircraft Corp. Service Bulletins B-271, DB-007, or C1B-009 (all dated March 12, 1999), as applicable; inspect shaft for proper size at next 100-hr/annual inspection; replace any undersized shaft before further flight. Model not explicitly stated in captured applicability text (P/N prefix historically associated with Hughes/Schweizer 269 series, not confirmed by name).

Whether AD 99-17-10 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 99-17-10 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.