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PM-121
Change 2
Learjet 31A
Pilot's Manual
(WITHOUT JOYSTICK)
OPTIONAL (WITH JOYSTICK)
(WITH JOYSTICK)
MFD CONTROL PANEL
Figure 5-10
An MFD control panel is installed in the pedestal. The panel controls
the functions of the multifunction display. The following functions
are provided:
DisplayFormat
EFIS Test
TCAS ONLY Select
Checklist Select
Display Brightness
Course Select
Navigation Source Select
EFIS REVERSIONARY CONTROL PANEL
Bearing Pointer Select
RS 232 Communications Port
(checklist programming)
Waypoint Position Entry (joystick)
Range Select (weather and map mode)
Ground Speed/Time to Station Select
Enter Select (waypoint coordinate
transfer)
An EFIS CONTROL panel is installed on both the pilot's and copilot's
instrument panel. The panel controls the reversionary functions of the
associated EFIS display. The following reversionary functions are provided:
AHS Select
ADC Select
SG Select
Composite/Display Select
Single-cue/Double-cue
EADI Down Select
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Refer to the FAA Approved AFM for a description and use of each
function.
PM-121
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Change 2
Pilot's Manual
Learjet 31A
FLIGHT INSTRUMENTS
EFIS REVERSIONARY CONTROL PANEL
Figure 5-11
Flight instruments include airspeed/Mach indicators, altitude/
vertical speed indicators, speed/temperature indicator, standby HSI,
standby attitude gyro, standby airspeed indicator and standby altimeter.
Refer to Electronic Flight Instrument System, also.
AIRSPEED/MACH INDICATORS
An airspeed /Machindicator is installed on both the pilot's and copilot's
instrument panel. Each indicator is a Bendix/King unit driven by
electrical signals from a remotely located air data computer. Features
of the indicator include: circular scale graduated from 50 to 430 knots,
airspeed pointer, maximum allowable pointer (barber pole), digital
KIAS/MACH display window, moveable Vref bug, moveable reference
airspeed bug and failure flag. Power for the indicators is 28 VDC
supplied through the I-amp PILOT A/S and CP A/S circuit breakers.
The pilot's airspeed/Mach indicator is operative during EMER BUS
mode.
The airspeed pointer positions itself along the graduated scale to indicate
the aircraft's airspeed in knots. The maximum allowable pointer
aligns with the maximum allowable speed (VMO/MMO) for existing
conditions (i.e. altitude and autopilot, and Mach trim status). The digital
display window displays speed in knots when Mach number is
less than 0.50 MI, and in Mach when Mach number is greater than
0.50 MI. AMACH annunciator illuminates when Mach number is dis-
5 - 34
PM-121
Change 1
i earjet 31A
Pilot's Manual
played. The Vref bug
nl is set by the crew with a knob on the face of
the indicator. Differences between the Vref bug and actual airspeed
will be reflect by the fast/slow scale on the EFIS display. The reference
airspeed bugis set by the anew with a knob on the face of the indicator
and is for reference purposes only. The failure flag will come
into view when the airspeed data is invalid.
AIRSPEED/MACH INDICATOR
Figure 5-12
ALTRUDE/VERTICAL SPEED INDICATORS
An altitude/vertical speed indicator is installed on both the pilot's
and copilot's instrument panel. Each indicator is a Bendix/lung unit
driven by electrical signals from a remotely located air data computer.
Features of the indicator include: circular altitude scale graduated
from 0 to 1000 feet in 20-foot increments, circular vertical speed scale
graduated from 0 to 6000 feet per minute (UP and DN), altitude
pointer, vertical speed pointer, digital altitude display window, altimeter
setting window and knob, vertical speed bug and failure flags.
The indicator also provides for altitude preselect and altitude alerter
functions and the capability to display density altitude. Power for the
indicators is 28 VDC supplied through the 2-amp PILOT ALTM VSI
andCP ALTM VSI circuit breakers. The pilot's altitude/vertical speed
indicator is operative during EMER BUSmode.
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Pilot's Manual
Learjet 31A
A window, on the upper half of the indicator, displays altitude in digital
form. Each revolution of the altitude pointer (analog) represents
1000 feet. Vertical speed is displayed on the lower half of the indicator
by the vertical speed pointer. The vertical speed bug may be used to
set the reference value while VS flight director mode is selected. The
altimeter setting window and knob allow for entering the current setting
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