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7.2. AIRFRAME
7.2.1. Fuselage
The GFRP-fuselage is of semi-monocoque construction. The fire protection cover on the fire wall is made from a special fire retarding ceramic fiber that is covered by a stainless steel plate on the engine side. The main bulkhead is of CFRP/GFRP construction.
The instrument panel is made of aluminum.
7.2.2. Wings
The GFRP-wings are of semi-monocoque sandwich construction, and contain a CFRP-spar. The ailerons and flaps are made from CFRP and are attached to the wings using stainless steel and aluminum hinges.
The wing-fuselage connection is made with three bolts each. The A- and B- bolts are fixed to the fuselage's root rib. The A-bolt is placed in front of the spar bridge; the B-bolt is near the trailing edge on each side of the fuselage. The two main bolts are placed in the middle of the spar bridge structure. They are accessible behind the seats and are inserted from the front side. A spring-loaded hook locks both bolt handles, securing them in place.
7.2.3. Empennage
The rudder and elevator units are of semi-monocoque sandwich construction. The vertical stabilizer contains a di-pole antenna for the VHF radio equipment, the horizontal stabilizer contains an antenna for the NAV equipment (VOR).
7.3. FLIGHT CONTROLS
The ailerons and elevator are actuated via push rods. The rudder is controlled using control cables. The flaps have three positions, CRUISE, T/O (take-off), LDG (landing), and are electrically operated. The switch is located on the instrument panel. The flap control circuit breaker can be manually ‘tripped’ to disable the flap system. Elevator forces may be balanced using the electric trim system.
7.3.1. Trim System
The Rocker switch is located on center console behind the throttle quadrant. The digital trim indicator is located in the upper instrument panel.
The switch controls an electrical actuator beside the vertical push rod in the vertical stabilizer. The actuator applies a load to compression springs on the elevator pushrod. The trim circuit breaker is located in the circuit breaker panel and can be tripped manually to disable the system.
switch forward = nose down
7.3.2. Flaps
The flaps are driven by an electric motor. The flaps are controlled by a three position flap operating switch on the instrument panel. The three positions of the switch correspond to the position of the flaps. The top position of the switch is used during cruise flight. When the switch is moved to a different position, the flaps move until the selected position is reached. The cruise (fully retracted) and landing (fully extended) positions are equipped with position switches to prevent over-traveling.
The electric flap actuator is protected by a circuit breaker (5 Amp), located on the right side of the instrument panel, which can be manually tripped to disable the system.
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本文链接地址：钻石20系列飞机维护手册 DA 20 SERIES AIRPLANE MAINTENANCE MANUAL(50)
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