General: Steering system allows to steer the aircraft on ground. Smaller aircraft has mechanical linkages to effect steering of the nose gear. Larger aircraft generally ahs two steering hydraulic cylinders attached to the shock strut housing. Actuation of the cylinders ensure rotation of the upper torque link of the nose landing gear. Sliding tube gets rotation through the lower torque link and hence the nose gear turns. System has a follow up linkage so that when desired amount of turn.
Monday, September 7, 2015
STEERING SYSTEM
General: Steering system allows to steer the aircraft on ground. Smaller aircraft has mechanical linkages to effect steering of the nose gear. Larger aircraft generally ahs two steering hydraulic cylinders attached to the shock strut housing. Actuation of the cylinders ensure rotation of the upper torque link of the nose landing gear. Sliding tube gets rotation through the lower torque link and hence the nose gear turns. System has a follow up linkage so that when desired amount of turn.
WHEELS
5.4.1 General: Aircraft wheels provide the mounting for tires which are designed with proper strength and characteristics to:
• Carry the total weight of the aircraft
• Withstand initial landing impact during touch down
• Offer and withstand high frictional force with the runway pavement
during landing roll
• Avoid aqua-planning (skidding due to water on the runway)
BRAKE ASSEMBLIES
Types/Variations: There are different kinds of brakes. Some uses frictional blocks that are simply pressed against the interior surface of the hub of the rotating wheel while some uses discs.
Brake assemblies commonly used on aircraft are the single-disk, dual-disk, multiple-disk, segmented rotor, or expander tube types. The single- and dual-disk types are more commonly used on small aircraft; the multiple-disk type is normally used on medium-sized aircraft; and the segmented rotor and expander tube types are commonly found on heavier aircraft.
Brake assemblies commonly used on aircraft are the single-disk, dual-disk, multiple-disk, segmented rotor, or expander tube types. The single- and dual-disk types are more commonly used on small aircraft; the multiple-disk type is normally used on medium-sized aircraft; and the segmented rotor and expander tube types are commonly found on heavier aircraft.
CABLE CONTROL SYSTEM
General: The conventional cable control system consists of flexible cable, terminals (end fittings) for attaching to other units, and turnbuckles.
primary flight control systems. Cable-type linkage is also used in engine controls, emergency extension systems for the landing gear, and various other systems throughout the aircraft.
Cable-type linkage has several advantages over the other types. It is strong and light in weight, and its flexibility makes it easy to route through the aircraft. An aircraft cable has a high mechanical efficiency and can be set up without backlash, which is very important for precise control.
Cable linkage also has some disadvantages. Tension must be adjusted frequently due to stretching and temperature changes.
Cable-type linkage has several advantages over the other types. It is strong and light in weight, and its flexibility makes it easy to route through the aircraft. An aircraft cable has a high mechanical efficiency and can be set up without backlash, which is very important for precise control.
Cable linkage also has some disadvantages. Tension must be adjusted frequently due to stretching and temperature changes.
Thursday, March 12, 2015
CONTROL SYSTEMS AND LINKGASES
Flight control system consists of cockpit control, control linkage and flight surfaces. Control linkage or connects manual cockpit controls to the flight surfaces.
Control run consists of different linkage components including:
a) Cockpit levers
b) Push-pull rods, push-pull cables (teleflexes)
c) Pulleys: Drive pulleys, End pulleys
d) Control cables
e) Bell cranks
(f) Torque tube and so on.
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