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normal limit. HALF BANK may be engaged in conjunction with any
lateral mode except Approach.
NAV (navigation) - The NAV mode provides commands to capture
and track the navigational course selected on the EHSI.
APR (approach) - The APR mode provides commands to capture
and track the navigational course selected on the EHSI with approach
accuracy. During ILS front course approaches, commands to capture
and track the glideslope will be generated after the Iocalizer has been
captured.
ALT SEL (altitude select) -The ALT SEL mode provides commands
to capture and track the selected altitude shown in the altitude preselect
window on the altitude/vertical speed indicator .
ALT HOLD (altitude hold) - The ALT HOLD mode provides commands
to track the indicated altitude present at the time of mode engagement.
The reference altitude may be changed using the vertical
command function of the control wheel trim switches. If ALT SEL
mode is used to capture an altitude, the ALT HOLD mode will automatically
engage after the selected altitude has been captured.
PM-121
5-21
Change 2
Pilot's Manual
Learjet 31A
CLB (climb) - The CLB mode provides commands to maintain a
preset speed versus altitude profile. Two climb profiles (Normal and
High Speed) have been programmed into the KFC 3100 system. The
vertical command function of the control wheel trim switches is used
to select the desired climb profile. Engaging the CLB mode will also
activate the ALT SEL mode if the preselected altitude is higher than
the aircraft's present altitude.
DES (descend) -The DES mode provides commands to maintain a
preset speed versus altitude profile. Two descent profiles (Normal
and High Speed) have been programmed into the IBC 3100 system.
The vertical command function o¬ the control wheel trim switches is
used to select the desired descent profile. Engaging the DES mode
will also activate the ALTSEL mode if the preselected altitude is lower
than the aircraft's present altitude.
MACH (Mach hold) - The MACH mode provides commands to
maintain the indicated Mach number present at the time of mode engagement.
The reference Mach number may be changed using the
vertical command function of the control wheel trim switches.
1AS (indicated airspeed hold) -The IAS mode provides commands
to maintain the indicated airspeed present at the time of mode engagement.
The reference airspeed may be changed using the vertical
command function of the control wheel trim switches_
VNAV (vertical navigation) - The VNAV mode provides commands
to capture and track a vertical track angle as defined by a compatible
flight management system with vertical navigation capability.
VS (vertical speed hold) -The VS mode provides commands to
maintain the vertical speed selected on the altitude/vertical speed indicator.
In the absence of a preselected vertical speed, flight director
commands will be generated to maintain the vertical speed present at
the time of mode engagement. The reference vertical speed may be
changed using the vertical command function of the control wheel
trim switches or the VS select knob on the altitude/vertical speed indicator.
Go-Around- Go-Around is a flight director only mode. Depressing
the GO-AROUND button on the left thrust lever knob disengages the
autopilot (if engaged) and commands both flight directors to 9° pitch
up and wings level attitude.
5-22
PM-121
Change 2
Learjet 31A
Pilot's Manual
STATUS ANNUNCIATORS
The autopilot controller incorporates two identical sets of annunciators
to provide the status of the left and right autopilot systems. Additionally,
two rudder boost (RB) annunciatoos are installed to provide
the status of the rudder boost system.
R (Roll Axis)-A steady amber R annunciation indicates a roll axis
failure. A flashing amber Rannunciation indicates a roll mistrim condition
.
P (Pitch Axis)-A steady amber P annunciation indicates a pitch axis
failure. A flashing amber P annunciation indicates a pitch mistrim
condition.
Y (Yaw Axis)-A steady amber Y annunciation indicates a yaw axis
failure.
AP (Autopilot)-A red AP annunciation indicates an autopilot failure.
The red AP annunciation will accompany any steady annunciation
of R, P or Y.
PT (Pitch Trim) - A red PT annunciation indicates a pitch trim
failure.
RB (Rudder Boost) -Two separate RB annunciators, one green and
one amber, are installed. Illumination of the green RB annunciator indicates
the rudder boost system is active . Illumination of the amber
RB annunciator indicates arudder boost system failure.
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