Is AD 98-14-03 a recurring Airworthiness Directive?

No — AD 98-14-03 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-14-03 apply to?

AD 98-14-03 applies to Alliedsignal — models KT 76A. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-14-03

one-time

Official AD 98-14-03 · FR doc 98-17301 · 1998-07-01 · appliance

Airworthiness Directives; AlliedSignal Inc. KT 76A Air Traffic Control (ATC) Transponders

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain AlliedSignal Inc. (AlliedSignal) KT 76A ATC transponders that are installed on aircraft. This AD requires incorporating a modification on the affected transponders that consists of replacing two resistor network modules with glass-coated modules. This AD is the result of reports of these ATC transponders transmitting misleading encoding altimeter information to ground-based ATC radar sites and nearby Traffic Alert and Collision Avoidance System (TCAS)- equipped aircraft. The actions specified by this AD are intended to prevent the transmission of misleading encoding altimeter information between affected aircraft caused by the inability of these ATC transponders to coordinate with ground-based ATC radar sites and nearby TCAS-equipped aircraft.

Which aircraft AD 98-14-03 applies to

MakesAlliedsignal

ModelsKT 76A

Serial-conditional — narrows to serials 93000–109999.

Part-conditional — 066-1062-00, 066-1062-10, 066-1062-02.

Applies to aircraft equipped with an AlliedSignal KT 76A ATC transponder, P/N 066-1062-00/10/02, serial numbers 93,000 through 109,999; requires replacement of resistor network modules M401 and RM402 with glass-coated parts (Mod 7) per AlliedSignal SB KT 76A-7, dated July 1996; installation of an affected transponder without Mod 7 is prohibited as of the effective date.

Whether AD 98-14-03 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 98-14-03 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.