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for most transient flight conditions; however,
wing-sweep rate can be significantly reduced or stalled
by negative-g or large positive-g excursions. Sufftcient
capability has been provided in the system, consistent
with the sustained performance capabilities of the aircraft.
With a failure of either the combined or flight
hydraulic systems, the wings will move at a reduced
rate.
Note
a The overwing fairings and flaps are susceptible
to a high frequency (60 cycles per
second), low-amplitude oscillation that
can be felt in cockpit. This overwing fairing
and flap buzz is normal and is influenced
by rigging of the fairings and air in
the hydraulic systems.
l Overwing fairing and flap buzz is usually
encounteredb etween 0.9 and 1.4 Mach.
2-91 ORIGINAL
x$&i ;,,!q~.&wwp Modes. Normal control of the
wing-sweep position in AUTO, AFT, FWD, and BOMB
modes is by the four-way wing-sweep switch on the
inboard side of the right throttle grip (Figure 2-46). As
an emergency mode of conno& changes in wing-sweep
position can be selected manually with the emergency
WING S-WEEP handle on the inboard side ofthe throttle
quadrant. The handle is connected directly to the wingsweep
hydraulic valves. The command source for positioning
the wings depends upon the mode selected by
the pilot or, in certain cases, is automatically selected.
Electrical and mechanical wing-sweep command paths
are shown on FO-11. Wing-sweep modes are shown in
Figure 2-47.
Anytime hydraulic pressure is on, the wings
cm bem oved inadvertentlyW. henp ositioning
the wings during ground operation other than
pilotpoststartorpostlandingchecklistprocedures,
use the emergency WING SWEEP
handle to minimize the possibility of moving
the wings inadvertently.
Note
:j When positioning the wings, do not command
opposite diition until wings have
stopped in original commanded position
(all sweep modes) to increase motor life.
e Theoptimumwingposition(triangularindex)
and the AUTOMAN flags may be
unreliable when the CADC caution light
is illuminated.
220.211 AUTO Mode. Selection of the AUTO mode
is made by placing the four-way wing-sweep switch in
the upper detented position, AUTO, permitting the
CADC Wing-sweep program to position the wings automatically.
The program positions the wings primarily as
a fonction of Mach number but includes pressure altitude
biasing. Wing position is scheduled to the optimum
sweep angle for developing maximum maneuvering
performsnce.Iuadditiontoprovidmganautomaticwing
positioning fimction, the programmer also defmes the
forward sweepl imit that cannotb e penetratedu sing any
of the &her eleetrieat (manual or bomb) modes. The
forward sweep limiter prevents electrical mispositioning
of the wings from a wing stmctore standpoint.
Pilot selection of the AUTO mode or automatic tmnsf?
r Tom the manual mode causes the AUTO flag to
Oppe.%in the wingsweep indicator. Once in the AUTO
mode, the four-way wing-sweep switch can be in the
center position without changing the command mode.
2.20.2.2 Manual Mode. The manual wing-sweep
modeiscommandedbyselectingAFTorFWDt?omthe
neutral position of the wing-sweep switch, driving the
wings in the commanded direction to any wing-sweep
position aft of the automatic program. The switch is
spring loaded to return to the center position. Manual
command mode exists unless the wing-sweep program
isintercepted,atwhichpointtransfertotheAUTOmode
is automatic. Indication of the existing mode is provided
by the AUTO and MAN flags in the wing-sweep indicator.
2.20.2.3 Bomb Mode. Bomb mode is selected by
moving the wing-sweep switch to the down (BOMB)
position. With the switch in BOMB, the following
occurs:
1. Wing SWEEP indicator shows h4AN flag.
2. If wing sweep is less than 5S0, wings will drive to
550.
3. If wing sweep is greater than 5S0, wings will not
move.
4. If maneuver flaps are extended, they will retract
and wings will sweep to 5S”.
As the aircraft accelerates and the AUTO wingsweep
schedule is intercepted, the wings will follow the
AUTO schedule even though the switch remains in
BOMB mode. Upon decelerating,t he wings will sweep
forward to 55’ and stop.
2.20.2.4 Emergency Mode. During normal mode
operation of the wing-sweep system, the wing-sweep
control drive servo drives the hydraulic valve command
input through a spider &tent mechanism. The emergency
handle under a tmnsparent guard is moved in
parallel with the servo output. The emergency mode
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F-14D 飞行手册 Flight Manual 1(103)
