AD 98-19-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-3 | Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-3B | Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines |
| engine | CFM International, S.A. | CFM56-3C | Airworthiness Directives; CFM International CFM56-3, -3B, and -3C Series Turbofan Engines |
Unsafe Condition
Accessory gearbox (AGB) starter gearshaft failure due to inadequate fatigue capability caused by high residual tensile stresses from manufacturing process and elimination of shotpeening in the gearshaft hub.
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Required Actions
On aircraft with two affected engines, remove one engine and replace with a serviceable engine not listed in SB Table 1, or replace the suspect starter gearshaft with a serviceable part within the compliance time. On aircraft with one affected engine, remove the engine and replace with a serviceable engine or replace the suspect gearshaft within the compliance time. Report to FAA if engine serial numbers do not correspond to starter gearshaft serial numbers in SB Table 1.
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Compliance Time
Within 350 hours time in service (TIS) after the effective date (September 28, 1998) or by October 1, 1998, whichever occurs first for two-engine installations. For single-engine installations, within 2,100 hours TIS after the effective date or by February 1, 1999, whichever occurs first.
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Affected Aircraft
CFM International CFM56-3, -3B, and -3C series turbofan engines with engine serial numbers (ESNs) listed in Table 1 of CFMI SB No. 72-877, Revision 1.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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