Is AD 98-34502 a recurring Airworthiness Directive?

No — AD 98-34502 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-34502 apply to?

AD 98-34502 applies to Westland — models WG30. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-34502

one-time

AD 98-34502 · 1998-12-30 · airframe

Airworthiness Directives; Westland Helicopters Ltd. 30 Series 100 and 100-60 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to Westland Helicopters Ltd. (Westland) 30 Series 100 and 100-60 helicopters. This action requires the removal and replacement of conformal pinion quill shafts installed in certain main rotor gearboxes that fail to pass a magnetic drain plug inspection. This amendment is prompted by a report of a forced landing that occurred when a single conformal pinion quill shaft failed in a main rotor gearbox (MRGB). This condition, if not corrected, could result in the failure of a MRGB, and a subsequent forced landing or loss of control of the helicopter.

Which aircraft AD 98-34502 applies to

MakesWestland

ModelsWG30

Applies when the installed main rotor gearbox (MRGB) serial number is one of: AAT4440, ABL5602, ACD2875, AAX4726, ABN8930, ACN7996, ABC9438, ABP3947, ADE6100, ABD7294, ABP9028, WAG397, ABG5056, ABT3965, WAG410, ABH5075, ABW0547, WAK525, ABJ9595, ACA3707, WAK561, ABK9484, or has a documented history of shock loading. Per Westland Helicopters SB No. W30-63-75; text describes affected aircraft as 'Westland 30 series helicopters'.

Whether AD 98-34502 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 98-34502 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.