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Tail
The tail group consists of a vertical stabilizer, a horizontal stabilizer, two elevators, and a rudder. The vertical stabilizer is mounted on the aft fuselage, and the horizontal stabilizer is mounted on the top of the vertical stabilizer. The rudder and elevators are mounted on the vertical and horizontal stabilizers, respectively.
The vertical stabilizer is fully cantilevered and sweptback. A scoop for cooling the air-conditioning systems is located on the lower leading edge section and is heated when the Airfoil Anti-ice is operating.
The longitudinal trim control system is an electrically actuated system that controls the movement of the horizontal stabilizer to provide longitudinal trim. The system is controlled from the flight compartment. The longitudinal trim control system consists of a primary system and an alternate system. The leading edge of the horizontal stabilizer is heated when the Airfoil Anti-ice is operating in the Tail De-ice mode.
The elevators are aerodynamically positioned by mechanically controlled tabs, to provide longitudinal control during normal flight. In addition, a power boost system (hydraulic augmentation) is installed to position the elevators to the down position only if 10 degrees or more of up-tab is commanded. This power boost only operates when the Elevators have otherwise failed to respond to a normal control input. An anti-float tab is installed on each elevator to provide improved longitudinal trim in the landing configuration. The pilot does not have direct control over the anti-float tab.
An elevator load feel system is installed to improve longitudinal control. The system provides a variable force consistent with longitudinal trim movement. Therefore the control column forces are light at low airspeeds and heavy at high airspeeds.
The rudder is normally operated with hydraulic pressure; however, if hydraulic pressure drops below normal operating pressure, the rudder system will automatically revert to manual operation. Manual operation of the rudder can also be selected by placing the hydraulic power shutoff valve control lever in the off position. The rudder is tab driven during manual operation.
Tail Cone
The tail cone is the detachable, jettisonable aft end of the airplane fuselage. A door, mounted in the lower forward portion of the tail cone, provides external maintenance access to the aft accessory compartment.
The tail cone may be jettisoned by actuation of either an interior or exterior control handle when the airplane is on the ground to provide an emergency exit. An automatic jettison feature is incorporated into the aft cabin door. The tailcone is accessible from the passenger compartment via the aft passenger door and a walkway provided by the lowered aft stairway ceiling.
Continental
Rev. 12/01/00 #29 Flight Manual
Air Conditioning and Pressurization
Cabin pressurization and conditioned air ventilation of the flight and passenger compartments are provided to maintain crew and passenger comfort. Pressurized, conditioned air is delivered through two independent air-conditioning systems designed for parallel operation but capable of independent operation. Engine bleed air is the primary source of air and energy for the air conditioning and pressurization system. During flight, cabin ventilation is also supplemented by a recirculation fan. .
Separate, automatic temperature control systems are installed to regulate flight and passenger compartment temperature to the desired settings.
All cargo compartments are pressurized. Heat is provided to the forward cargo compartment lining by vented heat air from the electrical/electronics compartment left and right radio racks. In addition, the forward cargo compartment has a fan and heater assembly to assist in maintaining the liner of the forward portion of the cargo compartment above freezing temperatures. The mid cargo compartment is provided with a fan to circulate ambient air.
Pressurization is normally controlled by one of two automatic controllers. Manual control of the Outflow Valve assembly is available by operation of a pressurization wheel on the cockpit pedestal.
Ram air may be supplied to the distribution system through the coolant air scoop in the dorsal fin. The Ram Air ventilation feature may be used on the ground or during unpressurized flight when the air conditioning is inoperative.
Also, a separate external ground connector is installed to allow connection of a ground source to supply preconditioned air to the airplane during ground operation if required.
Automatic Flight
The airplane is equipped for automatic flight guidance through the entire envelope of a flight (takeoff to landing). Digital flight guidance computers provide data for functions that follow: autopilot, stability augmentation, speed control, thrust rating, autothrottle, automatic reserve thrust, altitude alert, flight director, EPR synchronization, and on some airplanes Performance Management System.
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本文链接地址：MD-80 Flight Manual 麦道80飞行手册 2(108)
