Is AD 99-10-14 a recurring Airworthiness Directive?

Yes — AD 99-10-14 requires a repetitive inspection every 6 months. Next-due depends on the aircraft's time in service.

Which aircraft does AD 99-10-14 apply to?

AD 99-10-14 applies to Alliedsignal — models RIA-35B. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-10-14

recurring

Official AD 99-10-14 · FR doc 99-11782 · 1999-05-13 · appliance

Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes Equipped With AlliedSignal RIA-35B Instrument Landing System (ILS) Receivers

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747-400, 757, 767, and 777 series airplanes, that currently requires a revision to the Airplane Flight Manual (AFM) to prohibit certain types of approaches. That action also requires repetitive inspections to detect certain faults of all RIA-35B ILS receivers, and replacement of discrepant ILS receivers with new, serviceable, or modified units; or, alternatively, an additional revision to the AFM and installation of a placard to prohibit certain operations. That AD was prompted by a report of errors in the glide slope deviation provided by an ILS receiver. This amendment requires accomplishment of the previously optional terminating action. The actions specified by this AD are intended to prevent erroneous localizer deviation provided by faulty ILS receivers, which could result in a landing outside the lateral boundary of the runway.

Repetitive inspection. Re-inspect every 6 months. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 99-10-14 applies to

MakesAlliedsignal

ModelsRIA-35B

Part-conditional — 066-50006-0101, 066-50006-1101.

Applies to airplanes with an AlliedSignal RIA-35B ILS receiver, part number 066-50006-0101, installed, to prevent erroneous localizer deviation; fault indication differs by airframe (Boeing Model 747-400 and 777 series: EICAS advisory message 'SNGL SOURCE ILS'; Boeing Model 757 and 767 series: ILS flag on the EFIS display); modifying the receiver to part number 066-50006-1101 per AlliedSignal Electronic and Avionics Systems Service Bulletin M-4426 (RIA-35B-34-6), Revision 3, dated May 1998, is terminating action for the inspection requirement.

Whether AD 99-10-14 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 99-10-14 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.