AD 98-04-34
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11 | Airworthiness Directives; Mitsubishi Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-200 | Airworthiness Directives; Mitsubishi Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-300 | Airworthiness Directives; Mitsubishi Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-500 | Airworthiness Directives; Mitsubishi Model YS-11 and YS-11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-600 | Airworthiness Directives; Mitsubishi Model YS-11 and YS-11A Series Airplanes |
Unsafe Condition
Operating the airplane in severe icing conditions outside the certification envelope may lead to potential hazards due to insufficient flight crew information on recognizing and exiting such conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Airplane Flight Manual (AFM) Limitations Section to prohibit flight in severe icing conditions (as determined by visual cues), limit or prohibit use of flight control devices, and provide recognition cues and exit procedures. Revise Normal Procedures Section to limit flap use and prohibit autopilot use under specific icing conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective date as specified in the AD, requiring compliance within a set timeframe after publication.
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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