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4r-,
Vertical Soeed Preselect
To preselect a vertical speed, pull the
inner concentric knob out. The last used
vertical speed, an up or down arrow, and
FT/MIN will be annunciated. Rotating the
inner knob adjusts vertical speed in 100
feet per minute increments while the outer
knob controls the 1,000 feet per minute digit
up to a maximum of
*3,000
feethin. When
the selected vertical speed passes through
zero the up/down arrow will change direc-
tions. To engage this selected rate, push
the engage (ENG) button (while vertical
speed is displayed). Altitude Hold, if
engaged, will be canceled and the system
will capture the commanded vertical speed.
If
a change in vertical speed is
desired, the vertical trim rocker switch may
be used to slew the rate up or down at 100
feet per minute for every second the rocker
switch is held down. Vertical speed can
also be modified by holding down the CWS
button and changing pitch attitude until the
desired vertical speed command is dis-
played on the KAS 2978. If the KAS 2978
is displaying altitude at the time, vertical
speed will be displayed until after the CWS
switch is released.
The inner knob on the KAS 2976 can
be pulled out at any time to display the ver-
tical speed command. Rotating the knob
while it is "out' will vary the vertical speed
command.
Vertical Soeed Svnch
Vertical Speed synch may be used to
maintain the aircraft's current vertical speed
by pushing the engage (ENG) button while
the KAS 2978 is displaying altitude.
Immediately upon engaging VS synch, the
KAS 2976 will display for 2 seconds the
vertical speed which the KAP/KFC 150 sys-
tem will hold. Vertical Speed can be varied
up or down just as described in Vertical
Speed Preselect.
Test Mode
When the preflight test button on the
KC 191/192 is pushed, all legends and dig-
its are displayed on the KAS 2978 to con-
firm the display's integrity.
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