737 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.20.9
Marker Beacon
Marker beacon indications for outer, middle and inner marker are displayed on the
upper right hand corner of the attitude display located on the Captain’s and First
Officer’s Primary Flight Display (PFD) units.
Very High Frequency Omni Range (VOR)
Two VOR receivers are installed.
The flight crew must manually tune the VOR on the navigation control panel for
display on the DUs and the standby radio magnetic indicator. VOR–DME radio
updating is available if the crew manually tunes a valid in–range VOR station.
Left and right VOR bearings are displayed on the DUs when a valid in–range
VOR station is tuned and the respective EFIS control panel VOR/ADF switch is
in the VOR position. The DUs also show course deviation.
VHF NAV Transfer Switch
Should either VOR receiver fail, the VHF NAV transfer switch enables selection
of the opposite VHF NAV receiver for display.
ATC Transponder
Two ATC transponders are installed and controlled by a single control panel. The
ATC transponder system transmits a coded radio signal when interrogated by ATC
ground radar. Altitude reporting capability is provided.
Transmissions are automatically enabled when the air/ground system indicates air
mode.
TCAS is also controlled from the transponder panel. The TCAS system is
described in Chapter 15.
Transponders may also transmit information, such as flight number, airspeed or
groundspeed, magnetic heading, altitude, GPS position, etc., depending on the
level of enhancement. At some airports, airport equipment monitors airplane
position on the ground when the transponder is active (mode selector not in
STANDBY or OFF). TCAS modes should not be used on the ground for ground
tracking. If installed, the Automatic Dependent Surveillance-Broadcast (ADS-B)
data is downlinked to ATC and may be used for airplane tracking. The left GPS
provides data to Transponder 1 containing ADS-B position information and the
right GPS provides ADS-B position data to Transponder 2.
March 27, 2014
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