AD 98-06-30
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 400 | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, MU-300, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | 400A | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, MU-300, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | 400T | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, MU-300, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | MU-300 | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, MU-300, and MU-300-10 Airplanes |
| aircraft | Textron Aviation Inc. | MU-300-10 | Airworthiness Directives; Raytheon (Beech) Model 400, 400A, 400T, MU-300, and MU-300-10 Airplanes |
Unsafe Condition
Cracking and consequent failure of the outflow/safety valves, which could result in rapid decompression of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the outflow/safety valve in accordance with AlliedSignal Aerospace Service Bulletin 103570-21-4012, Revision 1, or Raytheon Service Bulletin No. 2476, Revision II, within 18 months after September 24, 1996 for Model 400, 400A, MU-300-10 series airplanes, and within 18 months after the effective date of AD for Model 400T (military) and MU-300 series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 18 months after September 24, 1996 (for Model 400, 400A, MU-300-10 series) or within 18 months after the effective date of AD (for Model 400T (military) and MU-300 series)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Raytheon (Beech) Model 400 (RJ-1 to RJ-65), 400A (RK-1 to RK-42), 400T (military TT-4 and TT-19), MU-300 (A001SA to A091SA), and MU-300-10 (A1001SA to A1011SA), equipped with AlliedSignal outflow/safety valves.
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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