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Airworthiness Directive 98-1704

recurring
AD 98-1704 · 1998-01-28 · turbine engine

Airworthiness Directives; CFM International CFM56-2, -3, -3B, - 3C, and -5 Series Turbofan Engines

What this AD requires

This amendment revises an existing airworthiness directive (AD), applicable to CFM International (CFMI) CFM56-2, -3, -3B, -3C, and -5 series turbofan engines, that currently requires repetitive magnetic chip detector (MCD) inspections and removal from service of certain No. 3 bearings. This amendment removes the requirement for MCD inspections for certain No. 3 bearings if the bearing has 6,000 or more hours time in service since new, extends the removal from service date for certain No. 3 bearings, changes the inspection interval for certain No. 3 bearings, deletes a specific No. 3 bearing part number, and replaces reference to specific maintenance manuals with service bulletins. Other requirements of the current AD remain unchanged and are carried over into this revised AD. This amendment is prompted by additional data that demonstrates a reduced bearing failure rate after a period of time in service; therefore, an acceptable level of safety can be maintained with a relaxation of some of the current AD requirements. The actions specified by this AD are intended to prevent a No. 3 bearing failure, and a subsequent inflight engine shutdown.

Repetitive inspection. Re-inspect every 50 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 98-1704 applies to

MakesCfm International
ModelsCFM56-2, CFM56-3, CFM56-3B, CFM56-3C, CFM56-5, CFM56

Installed on but not limited to Airbus A319 and A320 series, McDonnell Douglas DC-8 series, and Boeing 737 series aircraft.

Whether AD 98-1704 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 98-1704 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.