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AHS 1 AND AHS 2 ANNUNCIATOR LIGHTS
On abrr*31-035 thru 31-184, illumination of an amberAHS 1 or AHS
2 light indicates a failure of the associated cooling fan in the attitude
heading reference unit computer. TheAHSwill continue to operate for
aminimum of 30 minutes under normal temperature conditions .
On aim*l 31-185andsubsequent, the illumination of an amberAHS1 or
AHS 2 light indicates a failure in the attitude heading reference unit
computer. For a detailed list of failure modes, refer to the LITEF Pilots
Guide, P/N 142185-0000-311, Revision 1 or later version.
AHS i/AHS 2 REVERSIONARY MODE
TheAHS 1/AHS 2 switches on the EFLS CONTROLpanels are used to
select the attitude heading system for the respective EFIS display and
autopilot/flight director. On-sideAHSis thenormal selectionindicated
by a green annunciation on the switch. Reversionary (cross-side) selection
is indicated by an amber annunciation on the switch
Learjet 31A
Pilot's Manual
ELECTRONIC FLIGHT INSTRUMENTS SYSTEM (EFIS)
A Bendix/King 5-tube EFS 50 electronic flight instruments system is
installed to display airplane attitude data, navigational data, flight director
command, mode annunciators, weather, checklist, warnings
and diagnostic messages. The EFIS consists of an electronic attitude
director indicator (EADI) and electronic horizontal situation indicator
(EHSI) on both pilot's and copilot's instrument panels, a multifunction
display (MFD) on the center instrument panel, three symbol generators
(SG 1, SG 2 & SG 3), joystick (optional) and control panels to
operate the system. Cooling for the EFIS displays is provided by fans
integral to each display unit and two fans behind the instrument panel.
Cooling for the symbol generators is provided by one fan on each
symbol generator mounting rack. The pilot's displays are normally
driven by SG 1 and the copilot's displays are normally driven by SG
2. Should SG 1 or SG 2 malfunction, SG 3 may be selected to assume
the functions of the failed unit. The WD is driven by SG 3. The system
is powered by 28 VDC from the following circuit breakers: 7.5-
amp EADI 1 & 2,5-amp EHSI 1 & 2,7.5-amp SG 1 EADI, SG 2 EADI
& SG 3 EADI, 7.5-amp SG 1 EHSI, SG 2 EHSI & SG 3 EHSI, and 5-amp
WD.
ELECTRONIC ATTITUDE DIRECTOR INDICATOR (EADI)
An EADI is installed at each crew position. Each EADI is a 5-inch,
multicolor CRT display . An inclinometer is installed on the face of
each EADI to provide slip and skid information. The EADIs provide
the following information:
Pitch and Roll Attitude
Mode Annunciations
Radio Altitude & DH Set
Fast/Slow Indication
Marker Beacon
Rate-of-Turn (Optional)
Flight Director Commands
Warning Annunciations & Flags
Glideslope and Localizer Deviation
Vertical Navigation Deviation
Heading
ELECTRONIC HORIZONTAL SITUATION INDICATOR (EHSI)
An EHSI is installed at each crew position Each EHSI is a 5-inch, multicolor
CRT display . The EHSIs provide the following information:
Heading
Source Annunciations
Course Deviation
Selected Heading
Bearing Pointers
Weather Radar
PM-121
Change 2
DME Data
Warning Annunciations & Flags
Glideslope and Localizer Deviation
Vertical Navigation Deviation
Selected Course/Desired Track
5-31
Pilot's Manual
Learjet 31A
EFIS CONTROL PANEL
An EFIS control panel is installed for both the pilot's and copilot's displays.
The control panels are located in the pedestal. Each panel controls
the functions of the respective EFIS displays. Each panel provides
the following functions:
Decision Height Set
EFIS Test
Display Format
Bearing Pointer Select
Course Select
Range Select (weather and
map mode)
MULTIFUNCTION DISPLAY (MFD)
MFD CONTROLPANEL
STANDARD (WITHOUT JOYSTICK)
EFIS Test
Display Format
Bearing Pointer Select
Range Select (weather and
map mode)
5- 32
Radio Altimeter Test
Display Brightness
Navigation Source Select
Heading Select
Ground Speed/Time to Station
Select
EFIS CONTROL PANEL
Figure 5-9
An MFD is installed in the center instrument panel. The NIFD is a 5-
inch, multicolor CRT display. The MFD provides weather radar display,
FMS map display and functions as a third EHSI.
An MFD control panel is installed in the pedestal. The panel controls
the functions of the multifunction display . The following functions
are provided:
Display Brightness
Navigation Source Select
Course Select
Ground Speed/Time to Station
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