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Airworthiness Directive 98-23742

recurring
AD 98-23742 · 1998-09-03 · airframe

Airworthiness Directives; Boeing Model 757-200, -200PF, and - 200CB 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 series airplanes, that currently requires tests of the thrust reverser system, and repair, if necessary; installation of a modification that terminates those tests; and repetitive operational checks of that installation, and repair, if necessary. This amendment limits the applicability of the existing AD by including the specific series of the affected airplanes. This amendment is prompted by the upcoming type certification of the Model 757-300 series airplane, which will address the requirements of this amendment during the type certification process. The actions specified in this AD are intended to prevent deployment of a thrust reverser in flight and subsequent reduced controllability of the airplane.

Repetitive inspection. Re-inspect every 4000 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 98-23742 applies to

MakesBoeing
Models757

Applies to Boeing Model 757 series airplanes regarding the thrust reverser system; requires repetitive thrust reverser auto-restow and actuator lock/crossover shaft integrity tests unless the sync-lock feature was installed per Boeing SB 757-78-0032 Rev 2 (dated May 12, 1994), or installation of the sync-lock modification per that SB (in conjunction with Rolls-Royce RB.211 SBs 78-9613, 78-9627, and 78-9822) as terminating action.

Whether AD 98-23742 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 98-23742 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.