Is AD 98-08-23 a recurring Airworthiness Directive?

No — AD 98-08-23 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-08-23 apply to?

AD 98-08-23 applies to Boeing — models 747, 767. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-08-23

one-time

Official AD 98-08-23 · FR doc 98-10054 · 1998-04-16 · airframe

Airworthiness Directives; Boeing Model 747 and 767 Series Airplanes Equipped With General Electric (GE) CF6-80C2 Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747 and 767 series airplanes, that currently requires revising the FAA-approved Airplane Flight Manual (AFM) to prohibit the use of certain fuels; and either replacing the existing placard on the door of the fueling control panel with a new placard, or replacing all dribble flow fuel nozzles (DFFN's) with standard fuel nozzles, which terminates the requirements for a placard and AFM revision. This amendment continues these requirements and adds additional airplanes to the applicability. This amendment is prompted by a report of an engine flameout due to the use of JP-4 or Jet B fuel during certification testing on an engine with DFFN's installed. The actions specified in this AD are intended to prevent such engine flameouts and consequent engine shutdown.

Which aircraft AD 98-08-23 applies to

MakesBoeing

Models747, 767

Applies to Model 747 series and Model 767 series airplanes with dribble flow fuel nozzles (DFFN's) installed on certain engines, to prevent engine flameouts from use of JP-4 or Jet B fuel. Requires AFM fuel-limitation revision, and either a fuel-panel placard restricting JP-4/Jet B or removal/replacement of DFFN's with standard fuel nozzles, per Boeing Alert Service Bulletin 747-11A2052 or 767-11A0031, both dated September 11, 1997; restates and expands requirements of AD 97-22-04.

Whether AD 98-08-23 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 98-08-23 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.