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Airworthiness Directive 98-15-25

recurring
Official AD 98-15-25 · FR doc 98-29375 · 1998-11-03 · airframe

Airworthiness Directives; Eurocopter Deutschland GmbH Model EC 135 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-15-25, which was sent previously to all known U.S. owners and operators of Eurocopter Deutschland GmbH Model EC 135 helicopters by individual letters. This AD supersedes AD 98-09-11, applicable to Eurocopter Deutschland GmbH Model EC 135 helicopters, that required, before further flight, a tail rotor drive shaft vibration survey and installation of a Fenestron Shaft Retrofit Kit; inspecting the tail rotor drive shaft bearing (bearing) attaching lock plates for bent-open tabs, and broken or missing slippage marks; and visually inspecting each bearing support for cracks. This AD requires the same actions as the superseded AD, however it changes the required compliance time for the repetitive inspections. This amendment is prompted by reports of loose bearings and attachment bolts. This condition, if not corrected, could result in loose bearing attachment bolts, or cracked bearing supports, which could result in loss of drive to the tail rotor and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 15 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 98-15-25 applies to

MakesEurocopter Deutschland

Whether AD 98-15-25 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 98-15-25 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.