AD 98-13-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11 | Airworthiness Directives; Mitsubishi Heavy Industries Ltd. Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-200 | Airworthiness Directives; Mitsubishi Heavy Industries Ltd. Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-300 | Airworthiness Directives; Mitsubishi Heavy Industries Ltd. Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-500 | Airworthiness Directives; Mitsubishi Heavy Industries Ltd. Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-600 | Airworthiness Directives; Mitsubishi Heavy Industries Ltd. Model YS-11 and YS-11A Series Airplanes |
Unsafe Condition
Loss of airplane controllability or engine overspeed with consequent loss of engine power caused by the power levers being positioned below the flight idle stop while the airplane is in flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Limitations Section of the Airplane Flight Manual (AFM) to include a warning against placing the LOW STOP lever in the GROUND position during flight. The warning must state that this action may lead to loss of control or engine overspeed and power loss.
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Compliance Time
Within 30 days after the effective date of this AD (July 23, 1998).
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Affected Aircraft
Mitsubishi Heavy Industries, Ltd. Model YS-11 and YS-11A-200, -300, -500, -600 series airplanes, certificated in any category.
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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