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the flight director mode selector. When the ALT mode is selected, it
overrides the APR CAP, GA, IAS, VS, MACH, ALTSEL CAP or PITCH HOLD
modes. ALT is annunciated on the ADI. In the ALT mode, the pitch
command is proportional to the altitude error provided by the air data
computer. The altitude error signal is gain programmed as a function
of airspeed. Pressing and holding the TCS button allows the pilot to
manoeuvre the aircraft to a new altitude hold reference without
disengaging the mode. Once engaged in the altitude hold mode, the
SECTION 4
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OPERATING MANUAL
AUTOPILOT/STICK PUSHER DISCONNECT SWITCH
When pressed, disengages the autopilot and
disables the stick pusher system.
FRONT VIEW
PITCH TRIM DISCONNECT SWITCH
When pressed, disengages the autopilot
and pitch trim system.
TOUCH CONTROL STEERING SWITCH
When pressed, disconnects the autopilot servo clutches to allow
manual flight path commands to be inserted without disengaging
the autopilot and coupled flight director mode.
REAR VIEW
Control Wheel SECTION 4
figure 13 page 35
Oct 03/83
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OPERATING MANUAL
mode resets if the air data computer is not valid and the ADI command
cue goes out of view if the vertical gyro is not valid. If the baro
setting on the altimeter is changed, a command is generated to fly the
aircraft back to the original altitude reference.
(11) Indicated Airspeed Hold Mode
The indicated airspeed hold mode is selected by pressing the IAS
switch/light on the flight director mode selector. When IAS is
selected, it overrides the APR CAP, GA, ALT, VS, MACH, ALTSEL CAP or
PITCH HOLD modes. VRT is annunciated on the ADI. In the IAS mode,
the pitch command is proportional to airspeed error provided by the
air data computer. Pressing and holding the TCS button allows the
pilot to manoeuvre the aircraft to a new airspeed hold reference
without disengaging the mode. Once engaged in the IAS mode, the mode
resets if the air data computer is not valid and the ADI command cue
goes out of view if the vertical gyro is not valid.
(12) Vertical Speed Hold Mode
The vertical speed hold mode is selected by pressing the VS
switch/light on the flight director mode selector. When VS is
selected, it overrides the APR CAP, GA, ALT, ALTSEL CAP, IAS, MACH or
PITCH HOLD modes. VRT is annunciated on the ADI. Pressing and
holding the TCS button allows the pilot to manoeuvre the aircraft to a
new vertical speed hold reference without disengaging the mode. Once
engaged in the VS mode, the mode resets if the air data computer is
not valid and the ADI command cue goes out of view if the vertical
gyro is not valid.
(13) Mach Hold Mode
The Mach hold mode is selected by pressing the MACH switch/light on
the flight director mode selector. When the Mach hold mode is
selected, it overrides the APR CAP, GA, ALTSEL CAP or PITCH SYNC
modes. VRT is annunciated on the ADI. In the Mach hold mode, the
pitch command is proportional to the Mach provided by the air data
computer. Pressing and holding the TCS button allows the pilot to
manoeuvre the aircraft to a new Mach hold reference without
disengaging the mode. Once engaged in the Mach hold mode, the mode
resets if the air data computer is not valid and the ADI command cue
goes out of view if the vertical gyro is not valid.
(14) Standby Mode
The standby mode is selected by pressing the SBY switch/light on the
flight director mode selector. This resets all other flight director
modes and biases the ADI command cue from view. While pressed, the
SBY switch/light acts as a lamp test. All mode annunciators come on
and the flight director warning flag (FD) comes into view. When the
switch/light is released, all mode annunciators go out and the FD
warning flag retracts from view.
SECTION 4
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OPERATING MANUAL
(15) Altitude Preselect Mode
The altitude preselect mode is selected by pressing the ALTSEL
switch/light on the flight director mode selector. The desired
altitude is selected on the VNAV computer/controller and VS, IAS or
MACH is selected as the mode to fly to the selected altitude.
When outside the altitude bracket trip point, the ALTSEL ARM
annunciator and the selected pitch mode annunciator on the mode
selector come on. When reaching the altitude bracket trip point, the
system switches automatically to the ALTSEL CAP mode and the previous
pitch mode is cancelled. At bracket, a command is generated to
capture the selected altitude. When the selected altitude is reached,
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