Figure 16-38.--Wing sweep control system.
flap-glove vane thumb wheel control on the control
Rotating the thumb wheel fully forward, through
modified spoiler and DLC command drives, extends
the spoilers to the 12-degree position. The stabilizer is
driven to the 8-degree trailing edge down position.
Rotating the thumb wheel control fully aft retracts the
spoilers to the -4.5-degree position and drives the
stabilizers to 0 degrees. This maintains aircraft attitude
while changing the vertical descent rate. Direct lift
control can be disengaged by momentarily pressing the
DLC engage-chaff dispense push-button switch or by
setting either throttle lever to military power.
WING SURFACE CONTROL SYSTEM
The wing surface control system controls the
va r i a b l e g e o m e t r y w i n g s t o i n c r e a s e a i r c r a f t
performance at all speeds and altitudes. The system
also provides high lift and drag forces for takeoff and
landing. It provides increased lift for maneuvering, and
at supersonic speeds, aerodynamic lift to reduce trim
The wing sweep control initiated at the throttle
quadrant provides electronic or mechanical control of
a hydromechanical system that sweeps the wings. See
figure 16-38. The wings sweeps from 20 degrees
through 68 degrees in flight. On the ground, a wing
sweep position of 75 degrees is available (through
mechanical control) for spotting the aircraft or
enabling a wing sweep control self-test. See figure
Figure 16-39.--Wing oversweep position--manual control.