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then press the VNAV switch/light on the flight director mode
selector. This action freezes the selected angle and captures
the vertical path.
(d) The set knob may be used to preset a desired vertical angle
(fixed angle mode). Pressing the VNAV switch/light arms the
system to capture the selected vertical path angle. The VNCC
supplies a vertical deviation signal similar to GS deviation.
The vertical deviation signal is displayed on the pilotfs HSI
vertical deviation pointer when the VNAV mode is annunciated on
the pilots HSI. If the VNAV switch/light is not pressed before
the selected angle is reached, the VNCC reverts to angle compute
mode, continuously displaying the computed angle to the desired
destination. The selected angle is limited to HK9.9 degrees of
flight path.
SECTION 4
Page 24
Oct 03/83
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OPERATING MANUAL
VERTICAL SPEED POINTER
WARNING FLAG
Vertical Speed Indicator
Figure 7
SECTION 4
Page 25
Oct 03/83
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OPERATING MANUAL
MACH NUMBER
M 0 POINTER
DESIRED AIRSPEED
REFERENCE BUGS
WARNING FLAG
AIRSPEED POINTER
Mach/Airspeed Indicator
Figure 8
SECTION 4
Page 26
Oct 03/83
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OPERATING MANUAL
Ok \ i /HO
DASHED DISPLAY IF
AIR DATA COMPUTER
IS INVALID
MOMENTARY PUSHBUTTON
TO DISPLAY TAT
DISPLAYS TAS IN KNOTS
FROM 150 TO 559
DISPLAYS SAT IN °C
FROM-99 TO +50
FRONT PANEL
DIMMING
CONTROL
TAS/SAT/TAT Indicator
Figure 9
SECTION 4
Page 27
Oct 03/83
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OPERATING MANUAL
STAEL
To set station elevation, the selector switch is set to
STAEL and the SET knob is slewed to the desired
elevation. Resolution is 100 feet.
ALT
To set altitude, the selector 9**tc* a tet to ALT and
the SET knob is slewed to the desired attitude. The
altitude preselect mode is men mtutted by pressing
the ALTSEL switch/light on the tfcgm abactor mode
selector.
T O - FR
To set distance, the selector switch is set to TO or FR
and the SET knob is slewed to the distance to or from the
navigation aid (alongside track). Resolution is 0.1
nautical mile.
SET KNOB
VANG
When the selector switch is set to VANG, me
computed vertical path angle is displayed.
VNAV Computer/Controller SECTION 4
Figure 10 Page 28
Oct 03/83
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OPERATING MANUAL
(4) Vertical Path Flying
When a vertical path is selected by pressing the VNAV swith/light, the
vertical deviation, with respect to the selected vertical path, is
displayed on the pilot's HSI. Pressing the VNAV switch/light causes
the aircraft to capture the vertical path immediately if in the angle
compute mode, or when the preset angle is reached in the fixed angle
mode. At the transition, the aircraft is guided smoothly along the
selected vertical path until a position approaching the selected
altitude is reached. A second transition to the selected altitude is
then made to level off. As the aircraft reaches the selected
altitude, the altitude hold mode is automatically initiated and the
VNAV mode is reset.
(5) Vertical Input Cancelling
As the aircraft passes the selected point or desired altitude, the
vertical path problem is cancelled by replacing VANG, TO, FR and STAEL
by dashes. This prevents use of erroneous VORTAC data for a
subsequent VNAV problem.
If the computed angle reaches a preset maximum, the provision for
vertical path navigation is cancelled in the same manner. This
cancellation is preceded by flashing of the display for the last
degree of computed vertical path angle.
I. Instrument Comparator (Figure 11)
The instrument comparator is a self contained five-channel, six-light
instrumentation comparator monitor. It compares the dual installation for
correct pitch and roll attitude, heading, localizer signal and glideslope
signal. If a pre-determined difference exists between the two systems, the
fault is indicated on the annunciator lights; ROLL, PITCH, HDG, GS and
LOC. The instrument comparator has a self-monitoring feature which checks
the internal electronics of the comparator and indicates an internal
failure on the MNTR light.
Two lighted switches provide a test of the system. The TEST/RESET switch
initiates checks of the internal electronics and annunciator lights. The
switch also resets any previously disabled channel. The WARN/DISABLE
switch allows the pilot to disable any annunciator light that is on. If
　
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