Is AD 03-15993 a recurring Airworthiness Directive?

Yes — AD 03-15993 requires a repetitive inspection every 300 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 03-15993 apply to?

AD 03-15993 applies to Rolls-Royce Corporation — models 250-C30R/3, 250-C30R/3M, 250-C47B, 250-C47M, 250. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 03-15993

recurring

AD 03-15993 · 2003-06-30 · turboshaft engine

Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C30R/3, -C30R/3M, -C47B, and -C47M Turboshaft Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) models 250-C30R/3, -C30R/ 3M, -C47B, and -C47M turboshaft engines. This AD requires initial and repetitive electrical signal inspections of the hydromechanical unit (HMU) Power Lever Angle (PLA) potentiometer. This AD is prompted by an investigation by the National Transportation Safety Board (NTSB), which revealed that a potential undetected failure of the PLA potentiometer electrical signal could cause uncommanded and sudden changes in engine power. The actions specified in this AD are intended to prevent uncommanded and sudden changes in engine power.

Repetitive inspection. Re-inspect every 300 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 03-15993 applies to

MakesRolls-Royce Corporation

Models250-C30R/3, 250-C30R/3M, 250-C47B, 250-C47M, 250

Requires initial and repetitive electrical signal inspections of the HMU PLA (power lever angle) potentiometer per combined service bulletin CEB A-73-3103 (250-C30 engines) / CEB A-73-6030 (250-C47 engines), Revision 3; 250-C40 engine model not affected (used only in twin-engine applications).

Whether AD 03-15993 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 03-15993 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.