FULL and EXP VOR/ILS Modes
The VOR/ILS mode is useful when tracking or referencing VHF radio navigation
signals using a VHF navigation receiver. The VOR/ILS mode displays course
deviation using conventional EHSI presentations.

In addition to the conventional navigation data displayed, the VOR/ILS mode also
displays DME distance to the navaid, ADF bearing pointers (if an ADF bearing is
being received), wind direction and velocity, system source annunciation, and
selected frequency (not displayed if in auto tune mode).

The VOR/ILS mode may be displayed with a conventional, FULL compass rose,
or with a simplified, EXPANDED compass rose format.
The VOR/ILS mode display is a “heading–up” oriented display.

Copyright . The Boeing Company. See title page for details.
10.40.10  December 1, 2000

Flight Instruments, Displays -EFIS System Description 737 Operations Manual
PLAN Mode
The PLAN mode is a map display which may be used to view an FMC flight plan route, either in total for a short route, or waypoint–by–waypoint for a longer route. The PLAN mode display is oriented to true north.
Weather Radar Display
Display of weather radar returns on the EHSI is enabled or disabled by the WXR switch on the respective EFIS control panel. Radar returns can be displayed in all EHSI modes except the FULL NAV, FULL VOR/ILS and PLAN modes. A more detailed discussion of weather radar operation is contained in Chapter 11.
EGPWS Warnings
EGPWS warnings are displayed in large capital letters on the attitude indicator. Refer to Chapter 15, Warning Systems.
Instrument Transfer Switching
During normal operation, each pilot's EFIS displays utilize independent inertial reference system (IRS) and symbol generator (SG) inputs. In the event of IRS or SG failure, input sources may be switched. Other related instrument transfer switching is discussed in Chapter 11.
The EFI transfer switch determines the SG source for the Captain's and F/O's EADI and EHSI displays. With the EFI Transfer Switch in the NORMAL position, the No. 1 SG provides display symbols for the Captain's EFIS displays, and the No. 2 SG provides display symbols for the F/O's EFIS displays. If the EFI transfer switch is in the BOTH ON 1 position, both sets of displays utilize symbols provided by the No. 1 SG, and the No. 2 SG is turned off. If the EFI transfer switch is in the BOTH ON 2 position, both sets of displays utilize symbols provided by the No. 2 SG, and the No. 1 SG is turned off. The autopilot will use data only from a single IRU source when the EFI transfer switch is in either the BOTH ON 1 or BOTH ON 2 position.
The IRS transfer switch selects the IRS that supplies inputs to the respective SG as well as to other airplane systems (see Chapter 11).  With the IRS transfer switch in the NORMAL position, the left IRS provides inputs to the No. 1 SG, and the right IRS provides inputs to the No. 2 SG.  If the IRS transfer switch is positioned to BOTH ON L, the left IRS provides data to both SG's. If the IRS transfer switch is positioned to BOTH ON R, the right IRS provides data to both SG's.
Flight Instruments, Displays -EFIS System Description 737 Operations Manual

Light Sensing and Brightness Control

There are two sets of ambient light sensors that automatically adjust the brightness of the EADI and EHSI displays.  The Captain's and F/O's displays are independently adjusted. Two remote light sensors, located on the instrument glare shield, adjust brightness of the associated EADI and EHSI as a function of light coming through the forward windows.  Two integral light sensors, located in the EADI  and EHSI instrument bezels (one per display unit), work in parallel to adjust the brightness of the EADI and EHSI displays as a function of ambient light shining on the face of either display. Manual adjustment of the display brightness, above and below the brightness level set by the automatic system, is accomplished by adjusting the brightness controls on the associated EFIS control panel.
Copyright . The Boeing Company. See title page for details.
10.40.12  December 1, 2000

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.1
Flight Management System . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.1 Control Display Unit (CDU)  . . . . . . . . . . . . . . . . . . . . . . . .  11.10.1 Function and Execute Keys  . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.2 Alpha/Numeric and Miscellaneous Keys . . . . . . . . . . . . . . .  11.10.4 CDU Page Components . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.5 FMC Source Select Switch . . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.6 FMC Alert Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.7 Navigation Mode Selector . . . . . . . . . . . . . . . . . . . . . . . . . .  11.10.7
　
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