AD 99-21-30
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | MU-300 | Airworthiness Directives; Raytheon Model Mitsubishi MU-300 Airplanes |
| aircraft | Textron Aviation Inc. | MU-300-10 | Airworthiness Directives; Raytheon Model Mitsubishi MU-300 Airplanes |
Unsafe Condition
Uncommanded nose-down pitch at certain flap settings during icing conditions due to ice accumulation on the horizontal tail.
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Required Actions
Revise the Airplane Flight Manual (AFM) to provide operating procedures during icing conditions and limit maximum flaps position. Install an ice detector and revise the AFM to address its operation. For certain airplanes, convert configuration or modify landing gear warning horn system and revise AFM to specify flaps 10 degrees as normal landing configuration.
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Compliance Time
Before further flight
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Affected Aircraft
Raytheon Model Mitsubishi MU-300 and MU-300-10 airplanes, all serial numbers.
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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