AD 2013-15-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric | Company | Airworthiness Directives; General Electric Company Turbofan Engines |
Unsafe Condition
Failure and separation of the transfer gearbox (TGB) radial gearshafts, which could result in in-flight shutdown (IFSD) of one or more engines, loss of thrust control, and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Prohibit operation of an airplane with affected TGB radial gearshafts installed on both engines after the effective date of this AD. Prohibit operation of an airplane with affected TGB radial gearshafts installed on any engine 60 days after the effective date of this AD. Install a TGB radial gearshaft that is eligible for installation as a mandatory terminating action.
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Compliance Time
Before further flight for both prohibitions; within 60 days after the effective date for the second prohibition.
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Affected Aircraft
General Electric Company GE90-76B, GE90-77B, GE90-85B, GE90-90B, GE90-94B, GE90-110B1, GE90-113B, and GE90-115B turbofan engines with affected TGB radial gearshafts installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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