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Airworthiness Directive 98-07-11

recurring
Official AD 98-07-11 · FR doc 98-8468 · 1998-04-01 · airframe

Airworthiness Directives; GKN Westland Helicopters Limited WG-30 Series 100 and 100-60 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to GKN Westland Helicopters Limited (Westland) WG-30 series 100 and 100-60 helicopters. This action requires an initial visual inspection and replacement, if necessary, of all main rotor head tie-bars. Thereafter, this AD requires, at intervals not to exceed 220 hours time-in-service (TIS), replacing each main rotor head tie-bar (tie-bar) with an airworthy tie-bar. This amendment is prompted by an accident on a similar model military helicopter in which a tie-bar failed; it is suspected that the military helicopter involved in the accident exceeded the power-off transient rotor speed limitation. This condition, if not corrected, could result in failure of a tie-bar, loss of a main rotor blade, and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 220 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 98-07-11 applies to

MakesWestland
ModelsWG30

Model inferred from GKN Westland SB number prefix 'W30' (Westland 30/WG30). Requires visual inspection of main rotor tie-bars for bulging/swelling per SB W30-62-34, and replacement at intervals not exceeding 220 hours TIS with a zero-time or reinspected tie-bar per SB W30-62-35 (Annexe A-C), both dated Nov 29, 1995.

Whether AD 98-07-11 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 98-07-11 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.