Airworthiness Directive · Amendment 39-9504 · Beech Model 400, 400A, and MU-300-10 Airplanes
Beech Model 400, 400A, and MU-300-10 Airplanes
Superseded. A later AD replaced this one: AD 2009-07-02. Comply with the one in force.
Model 400 airplanes, serial numbers RJ-1 through RJ-65 inclusive; Model 400A airplanes, serial numbers RK-1 through RK-93 inclusive; and Model MU-300-10 airplanes, serial numbers A1001SA through A1011SA inclusive; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Beech Model 400, 400A, and MU-300-10 airplanes, that requires installation of an improved adjustment mechanism on the flightcrew seats and replacement of the existing aluminum seat reinforcement assemblies with steel assemblies. This amendment is prompted by reports of incomplete latching of the existing adjustment mechanism and cracked reinforcement assemblies, which could result in sudden shifting of a flightcrew seat. The actions specified by this AD are intended to prevent such shifting of a flightcrew seat, which could impair the flightcrew's ability to control the airplane.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
