Is AD 98-30335 a recurring Airworthiness Directive?

No — AD 98-30335 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-30335 apply to?

AD 98-30335 applies to Boeing — models 757-200, 757. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-30335

one-time

AD 98-30335 · 1998-11-13 · airframe

Airworthiness Directives; Boeing Model 757-200 Series Airplanes Equipped With Rolls Royce Model RB211-535E4/E4B Engines

What this AD requires

This amendment revises an existing airworthiness directive (AD), applicable to certain Boeing Model 757-200 series airplanes, that currently requires a revision to the Airplane Flight Manual to ensure that the flightcrew activates the engine cowl thermal anti-ice (CTAI) system for both engines at the top of descent to avoid engine rundown (loss of engine power). This amendment clarifies the relationship between two existing AD's. The actions specified in this AD are intended to ensure that the flightcrew activates the engine cowl thermal anti-ice system for both engines prior to descent; activation of the engine CTAI system in the middle of descent could result in a compressor stall and subsequent engine rundown of multiple engines.

Which aircraft AD 98-30335 applies to

MakesBoeing

Models757-200, 757

Applies only to 757-200 series airplanes equipped with Rolls-Royce RB211-535E4 or RB211-535E4B engines; certificated in any category.

Whether AD 98-30335 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 98-30335 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.