Is AD 98-10-03 a recurring Airworthiness Directive?

No — AD 98-10-03 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-10-03 apply to?

AD 98-10-03 applies to Allison — models 250-C47B, 250. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-10-03

one-time

Official AD 98-10-03 · FR doc 98-12063 · 1998-05-08 · turboshaft engine

Airworthiness Directives; Allison Engine Company Model 250-C47B Turboshaft Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD) 97-21-09, applicable to Allison Engine Company Model 250-C47B turboshaft engines, that currently requires replacing the engine main electrical harness assembly with an improved assembly, installing a new hydromechanical unit (HMU) and electronic control unit (ECU), removing the placard notifying the pilot that the overspeed protection system is disabled, and revising the Bell Helicopter Textron, A Division of Textron Canada Ltd. (BHTC), Model 407 Rotorcraft Flight Manual (RFM). This amendment continues the requirements of the current AD, but adds the requirement to install ECUs with improved resistance to corrosion. This amendment is prompted by reports of ECUs with annunciated hard faults due to corrosion on internal connectors. The actions specified by this AD are intended to prevent uncommanded inflight engine shutdowns, which can result in autorotation, forced landing, and possible loss of the helicopter.

Which aircraft AD 98-10-03 applies to

MakesAllison

Models250-C47B, 250

Installed on but not limited to Bell Helicopter Textron (BHTC) Model 407 helicopters.

Whether AD 98-10-03 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 98-10-03 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.