AD 98-07-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-3 | Airworthiness Directives; CFM International CFM56-2, -3, -3B, and -3C Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-3B | Airworthiness Directives; CFM International CFM56-2, -3, -3B, and -3C Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-3C | Airworthiness Directives; CFM International CFM56-2, -3, -3B, and -3C Series Turbofan Engines |
Unsafe Condition
Separation of the inner and outer cones of the No. 3 bearing rear stationary air/oil seal due to insufficient adhesive bonding, allowing oil migration into the HPCR flowpath and potential contact between the outer cone and the HPCR stage 1-2 spool bore, leading to rubs and potential uncontained failure of the HPCR stage 1-2 spool.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service certain No. 3 bearing rear stationary air/oil seals and replace with serviceable parts. Install retention bushings. Remove from service HPCR stage 1-2 spools with documented rubs at the next engine shop visit or prior to accumulating 2,000 cycles in service since the rub event was confirmed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 15 days after the effective date of this AD for seal removal and bushing installation. For spool removal, at the next engine shop visit after the effective date or prior to accumulating 2,000 cycles in service since the rub event confirmation, whichever comes first.
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Affected Aircraft
CFM International CFM56-2, -3, -3B, and -3C series turbofan engines installed on McDonnell Douglas DC-8 series and Boeing 737 series aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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