AD 99-21-26
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 400 | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | 400A | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | 400T | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | MU-300-10 | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, and MU-300-10 Airplanes |
Unsafe Condition
Uncommanded nose-down pitch at certain flap settings during icing conditions due to inadequate ice protection system.
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Required Actions
Revise the Airplane Flight Manual (AFM) to include special operating procedures during icing conditions. Install an additional anti-ice control valve, pressure switch, ice detector, and related components per Raytheon Service Instructions No. T-1A-0064.
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Compliance Time
Before further flight
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Affected Aircraft
Raytheon (Beech) Model 400, 400A, 400T, and MU-300-10 airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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