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Airworthiness Directive 97-18-05

recurring
Official AD 97-18-05 · FR doc 97-23176 · 1997-09-02 · airframe

Airworthiness Directives; Boeing Model 757 Series Airplanes Equipped With Pratt & Whitney Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes, that currently requires repetitive inspections to detect cracking in the midspar fuse pins; replacement with new or refinished fuse pins, if necessary; and repetitive inspections of newly installed fuse pins. This AD requires earlier initial inspections and replacements; more frequent repetitive inspections of certain fuse pins; and replacement with new fuse pins, if necessary. This amendment is prompted by reports of fatigue cracking of the midspar fuse pins and by fatigue test data indicating that current inspection thresholds and intervals for repetitive inspections are inadequate to detect fatigue cracking in a timely manner. The actions specified in this AD are intended to detect and correct such fatigue cracking, which could lead to separation of the strut and engine from the wing of the airplane.

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

Which aircraft AD 97-18-05 applies to

MakesBoeing
Models757
Part-conditional — 311N5067-1, 311N5217-1.

Applies to airplanes identified in the preceding applicability provision; required midspar fuse-pin inspection/replacement actions and repeat intervals differ depending on whether the airplane has straight fuse pins P/N 311N5067-1, refinished straight fuse pins P/N 311N5067-1, or newly installed 15-5PH fuse pins P/N 311N5217-1, per Boeing Alert Service Bulletin 757-54A0019, Revision 6.

Whether AD 97-18-05 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 97-18-05 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.