Is AD 2003-04-06 a recurring Airworthiness Directive?

No — AD 2003-04-06 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2003-04-06 apply to?

AD 2003-04-06 applies to Honeywell — models RNZ-850, RNZ-851, Primus II. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2003-04-06

one-time

Official AD 2003-04-06 · FR doc 03-4238 · 2003-02-24 · appliance

Airworthiness Directives; Various Aircraft Equipped With Honeywell Primus II RNZ-850/-851 Integrated Navigation Units

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to various aircraft equipped with a certain Honeywell Primus II RNZ-850/-851 Integrated Navigation Unit. As one alternative for compliance, this action provides for a one-time inspection to determine whether a certain modification has been installed on the Honeywell Primus II NV850 Navigation Receiver Module, which is part of the Integrated Navigation Unit. In lieu of accomplishing this inspection, and for aircraft found to have an affected navigation receiver module, this action provides for revising the aircraft flight manual to include new limitations for instrument landing system (ILS) approaches. This action is necessary to ensure that the flightcrew has an accurate glideslope deviation indication. An erroneous glideslope deviation indication could lead to the aircraft making an approach off the glideslope, which could result in impact with an obstacle or terrain. This action is intended to address the identified unsafe condition.

Which aircraft AD 2003-04-06 applies to

MakesHoneywell

ModelsRNZ-850, RNZ-851, Primus II

Part-conditional — 7510134-811, 7510134-831, 7510134-901, 7510134-931.

Applies to Honeywell Primus II RNZ-850/-851 Integrated Navigation Units installed on any aircraft; required action (AFM flight-limitations revision) depends on whether Mod 'L' is installed on the NV-850 Navigation Receiver Module (P/N 7510134-811/-831/-901/-931).

Whether AD 2003-04-06 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 2003-04-06 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.