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Airworthiness Directive 98-25-12

recurring
Official AD 98-25-12 · FR doc 98-32793 · 1998-12-14 · turbine engine

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

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757-200 series airplanes, that requires repetitive inspections to detect cracking of the honeycomb core of the acoustic panels in the engine inlet, and repair, if necessary. This amendment also requires eventual replacement of the existing engine inlet with a new or serviceable inlet, which, when accomplished, terminates the repetitive inspections. This amendment is prompted by reports of cracking of the honeycomb core of the acoustic panels in the engine inlet, and incidents of pieces of the panels breaking off and being ingested into the engine. The actions specified by this AD are intended to detect and correct cracking of the honeycomb core of the acoustic panels in the engine inlet, which could result in reduced structural integrity of the engine inlet, and consequent engine shutdown or surge; or, in the event of a fan blade failure, separation of the inlet from the engine.

Repetitive inspection. Re-inspect every 650 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 98-25-12 applies to

MakesRolls-Royce
ModelsRB211

The extracted text begins mid-document with boilerplate ('applies to each airplane identified in the preceding applicability provision'); the actual airplane/engine model list precedes this excerpt and was not captured. Hardware addressed is the engine inlet acoustic panels on Rolls-Royce RB211 series turbofan engines, per Rolls-Royce Service Bulletins RB.211-71-B480, RB.211-71-9909, and RB.211-71-9958, to detect/correct honeycomb core cracking of acoustic panels.

Whether AD 98-25-12 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 98-25-12 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.