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in inches of mercury (IN HG) or millibars (MB). The altitude select/
density altitude window displays the selected altitude, in hundreds
of feet, to be used with the ALT SEL flight director mode. The
selected altitude is set using a knobon the indicator. Thewindow will
display density altitude for approxiatately five seconds at the end of
the air data system's self-test or at any time by pressing the PUSH
BARO TEST knob twice in rapid succession . The ALTand VS failure
flags will come into view when the associated data is invalid. The
ENG button maybe used to engage the VS flight director mode and
the SEL button may be used to engage the ALT SEL flight director
mode. Altitude alerter visual and aural cues are provided which alert
the crew that the selected altitude is being approached or the aircraft
has deviated from the selected altitude. The visual cues are provided
by both pilot and copilot indicators. The aural cue is triggered by the
pilot's indicator.
ALTITUDE/VERTICAL SPEED INDICATOR
FiWe 5-13
5-36
PM-in
Original
Learjet 31A
Pilot's Manual
SPEED/TEMPERATURE INDICATOR
A speed/temperature indicator is installed on the pilot's instrument
panel. The indicator is a Bendix/King unit driven by electrical signals
from a remotely located air data computer. Features of the indicator
include: digital readout of true airspeed (TAS) in knots and static air
temperature (SAT) or total air temperature (TAT) in degrees Celsius.
The S/T button is used to toggle between static air temperature and
total air temperature. Power for the indicator is 28 VDC supplied
through the 1-amp SAT-TAS davit breakers on the pilot's circuit
breaker panel.
SPEED/TEMPERATURE INDICATOR
Figure 5-14
STANDBY AIRSPEED/MACH INDICATOR
A standby airspeed/Mach indicator is installed on the center instrument
panel. The indicator face consists of a stationary, circular airspeed
scale reading from 0 to 400 knots, a moveable Mach scale, an
airspeed/Mach pointer and a mwdmum allowable marker (barber
pole). The Mach scale rotates with changes in altitude to maintain the
correct Mach/airspeed relationship for any given altitude. The maximum
allowable marker rotates with the Mach scale and maintains a
position at 0.78 Ml. Tiw pointer responds to pitot pressure from the
copilot's pitot mast and static pressure from the selected source (LBOTHR).
The standby airspeed/Mach indicator is used to cross
check the electrically-driven pilot and copilot indicators and serves as
a back up unit in the event both pilot and copilot indicators become
inoperative.
PM-121
5- 37
Original
Pilot's Manual
Learjet 31A
STANDBYAIRSPEED/MACH INDICATOR AND ALTIMETER
Figure S-IS
STANDBY ALTIMETER
A standby altimeter is installed on the center instrument panel. The altimeter
displays altitude on the counter-drum-pointer presentation.
The altimeter dial is graduated in 20-foot increments from 0 to 1000.
The pointer makes one complete revolution per 1000 feet of altitude.
The counter rotates to produce a digital display of altitude in ten thousands
and thousands of feet. The hundreds, tens and units places are
fixed zeros. A Kollsman window displays the altimeter setting in inches
of mercury (IN HG). The altimeter setting is entered by rotating the
set knob on the altimeter bezel. The altimeter responds to static pressure
from the selected source (L-BOTH-R). The standby altimeter is
used to cross check the electrically-driven pilot and copilot indicators
and serves as a back up unit in the event both pilot and copilot indicators
become inoperative.
STANDBYATTITUDE INDICATOR
Astandby attitude indicator is installed on the center instrument panel.
The indicator will provide 92° of climb, 78° of dive and 360° of roll attitude
information. A sky pointer is incorporated to indicate vertical in
any roll attitude. Roll index marks at 10°, 20°, 30° and 90° provide measurement
of angular displacement from vertical as indicated with the
5-38
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Learjet 31A
Pilot's Manual
sky pointer. The two colored pitch drum is directly linked to the spin
motor of the gyro to provide direct reading of aircraft attitude in both
roll and pitch. The light colored area marked CLIMBrepresents the sky.
The dark colored area marked DIVE represents the earth.Ahorizontal
white line divides the colored areas to represent the horizon. Index
marks are incorporated on the drum to indicate every 5° ofpitch in both
CLIMB and DIVE attitudes. The adjustable miniature airplane symbol
indicates aircraft pitch and roll attitude relative to the horizon. The
　
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