51 Standard Practices and structures

TTP	B1-L3	ATA 51
Beech 90 Series	B2-L1	Standard Practices and structures

51 STANDARD PRACTICES, GENERAL -00 General -10 Investigation, Cleanup and Aerodynamic Smoothness -20 Processes -30 Materials -40 Fasteners -50 Support of Airplane for Repair and Alignment Check Procedures -60 Control-Surface Balancing -70 Repairs -80 Electrical Bonding

The King Air 90 Series aircraft are an all metal, low-wing monoplane of semimonocoque construction. It has fully cantilevered wings and a conventional tail empennage. The wings are an efficient, high-aspect ratio design. The airfoil section provides an excellent combination of low drag for cruise conditions and easy handling for low speed terminal conditions and is well suited for small airport operations.

The aircraft is mainly constructed of high-resistance aluminum alloy, although certain structures are made of other materials. The fuselage is pressurized to the skin between the forward and aft pressure bulkheads. All skin, bulkheads and structure points, plumbing, and wiring connections passing through a pressure wall, access doors, windows, control cables, and torque shafts are  sealed  to  minimize  air  leakage. The  wing center section is an integral part of the fuselage and ends slightly outboard of the engine nacelles. The outer wing panels outboard of the nacelles are attached  to the center section fore and aft spars with bolts and are removable. To provide a convenient stairway for boarding the aircraft, the cabin entrance door on the left side of the fuselage swings down to become an airstair. An over wing emergency exit is installed on the right side of the fuselage.

The primary structural components listed below are essential to the proper function of the aircraft. Failure occurring to any of the components would seriously endanger the safety of the aircraft and/ or the passengers.

•  Control systems

•  Engine mounts

•  Fittings

•  Skin of the fuselage, wings, tail, and control surface

•  Wing,  tail  surface,  and  control  surface spars

•  Landing gears and support structure

•  Auxiliary members used to strengthen or support other members carrying direct loads

•  Seats and seat support structure

The secondary structural components listed below, in the event of failure, would require immediate attention, but would not necessarily endanger the safety of the aircraft and/or the passengers.

•  Wingtips

•  Fairings

•  Nose Cone

•  Nonstructural doors and covers

•  Furnishings   and   upholstery   (excluding seating)

PTP  Beech 90 Series	B1
	B2