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Each pilot’s deviation alerting system self-tests upon becoming armed at 1500 feet radio altitude. This self-test generates a two second LOC and G/S deviation alerting display on each attitude indicator.
Below 2500 feet radio altitude, with the localizer pointer in view, a rising runway symbol comes into view. The symbol provides lateral guidance. At 200 feet radio altitude, the symbol rises toward the airplane symbol.
Approach Minimums
YA613 - YA687, YC153, YC154 The selected radio altitude or barometric approach minimums are set on the EFIS control panel. They are displayed near the bottom left of the altitude display.
Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -Primary Flight Display (PFD) 737 Flight Crew Operations Manual

YA721 - YA809, YC411 - YK104 The selected radio altitude or barometric approach minimums are set on the EFIS control panel. The radio altitude approach minimum is displayed near the top left of the altitude display and the barometric approach minimums is displayed near the bottom left of the altitude display.
Radio Altitude
YA613 - YA687, YC153, YC154 The current radio altitude is displayed in the bottom center of the attitude indication area when radio altitude is below 2,500 feet AGL. The display turns amber when the radio altitude is below the radio altitude minimums.
YA721 - YA809, YC411 - YK104 The current radio altitude is displayed above the upper right corner of the attitude indication area when radio altitude is below 2,500 feet AGL. When between 1000 feet and 2500 feet AGL, the readout is digital. When below 1000 feet AGL, the readout is displayed in a round dial format. The display turns amber when the radio altimeter is below the radio altitude minimums.
Altitude
Altitude is displayed on an altitude tape along the right side of the PFD. It is also shown digitally in a window in the middle of the tape. When meters is selected on the EFIS control panel:
.
current altitude in meters is also shown above the altitude window

.
selected altitude in meters is displayed above the altitude tape. Selected altitude is displayed above the altitude tape and is boxed when

approaching the selected altitude. Selected altitude is also depicted with a bug on the altitude tape.
YA721, YA722 The selected barometric approach minimum is indicated on the altitude tape with a triangular pointer and a line when BARO minimums are selected.
YA613 - YA687, YA801 - YK104 The selected barometric approach minimum is indicated on the altitude tape with a triangular pointer and a line when BARO minimums are selected. When RADIO minimums are selected, the pointer is still set at BARO minimums but there is no line.
A landing altitude reference bar is displayed along the inner edge of the altitude indication. The reference bar indicates the height above touchdown. A white bar is displayed from 1000 to 500 feet above landing altitude. An amber bar is displayed from 500 feet to the landing altitude.
Copyright . The Boeing Company. See title page for details.
10.31.4  June 1, 2005

Flight Instruments, Displays -Primary Flight Display (PFD) 737 Flight Crew Operations Manual
A landing altitude indication is displayed as a crosshatched area and indicates:
.  
the FMC landing altitude for destination runway or airport, or

.  
the landing altitude for departure runway or airport until 400 NM from
departure or one–half the distance to destination, whichever occurs first.

 

The current barometric reference is displayed below the altitude tape in either inches of mercury or hectopascals as selected on the EFIS control panel. A preselected barometric reference can be displayed when STD is displayed.
YA721 - YA809, YC411 - YD655 Altitude reference is selectable between QNH and QFE. QNH is the normal operating mode. A description of QFE operation is contained in the CDU Approach Reference Page description in Chapter 11, Flight Management, Navigation.
Vertical Speed
Vertical speed is displayed to the right of the altitude tape with a tape and pointer. Vertical speed is digitally displayed above or below the vertical speed display when vertical speed is greater than 400 feet per minute. It is displayed above with positive vertical speed and below with negative vertical speed. The selected vertical speed bug shows the selected vertical speed when in the AFDS vertical speed (V/S) pitch mode.
Heading/Track Indications
Heading/track information is displayed in the bottom section of the PFD on a section of the compass rose. Current heading is displayed under a pointer at the top of the compass rose. The MCP selected heading is displayed as a bug on the outside of the compass rose and digitally in the left half of the compass rose.
The current heading/track reference (MAG/TRU) is shown in the right half of the compass rose. A line drawn perpendicular to the edge of the compass rose from the invisible center depicts the current airplane track.
　
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