• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
WING SURFACE CONTROL SYSTEM - 14018_375
Wingtip Type

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
Page Navigation
  353    354    355    356    357  358  359    360    361    362    363  
Mechanical Control When wing sweep is under mechanical control, the wing sweep handle positions the wings through the wing sweep/flap and slat control box. Because the minimum wing sweep limiting is not available under mechanical control, the wings can be swept to an adverse position that could cause damage to the wings. Mechanical control is used for emergency wing sweep and wing oversweep. During emergency wing sweep, the wing sweep handle, mechanically coupled to the wing sweep/flap and slat control box through a cable assembly, positions the wings. The wing sweep can be returned to electronic control by repositioning the wing sweep handle to the stowed position. Wing oversweep can only be obtained with the aircraft weight on the wheels. Wing oversweep, shown in figure 9-39, reduces the amount of space required for spotting the aircraft. A wing sweep self-test can only be performed while the wings are overswept. SPEED BRAKE SYSTEM Speed brakes are hinged, movable secondary control surfaces used for slowing down the speed of the aircraft by increasing the profile drag. These surfaces are also called “dive brakes” or “dive flaps.” On some aircraft, they are hinged to and faired with the side or bottom of the fuselage. On others, they are attached to the wings.    Regardless of their location, their purpose is the same. Fuselage Type The fuselage speed brake system is normally electrically controlled and hydraulically operated. See figure 9-40. In an emergency, it can be controlled manually. The brake surfaces are installed on the sides of the aft portion of the fuselage below and forward of the horizontal stabilizer. They hinge at their forward end. When in the closed position, they fit flush with fuselage skin. An elevator speed brake interconnect provides a connection between the left-hand speed brake and the aircraft nose down elevator control cable. When the speed brakes open, the cable pulls and provides a nose down action to counteract the tendency of the aircraft to assume a nose up condition. The speed brakes may be actuated by the two-position, spring-loaded-to-neutral control switch on the throttle lever or by the manual override control handle. When operating the switch to open the speed Figure 9-40.—Speed brake control system. 9-46







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.