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– Refer to Chapter 15, Warning Systems.
5 Transponder Code Indicator
Displays transponder code.
Displays operating transponder (L or R).
AFT AISLE STAND
L R
IDENT
S A C T
T
C
A
XPNDR
ATC L
TA ONLY
XPNDR TA/RA
ALT RPTG
OFF
STBY 2
1
3
4
5
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.10.12 D6-30151-425
Flight Management, Navigation -
Controls and Indicators
Weather Radar
Weather Radar Panel
1 TILT Control
Controls antenna tilt angle with reference to horizon.
2 MAP GAIN Control
Rotate - sets receiver sensitivity in MAP mode. Full clockwise sets receiver
sensitivity at preset calibrated level.
3 Receiver/transmitter (R/T) Switches
LR/T - selects left R/T. Radar antenna stabilized by left and center IRU.
RR/T - selects right R/T. Radar antenna stabilized by right and center IRU.
4 Mode Switches
Control display on respective ND.
Push -
TFR (transfer) - selects opposite display.
Note: Selecting both TFR switches at the same time places R/T in standby.
WX (weather) - displays weather returns with gain controlled automatically.
W
R D
R
X
MAP
TILT
0
UP
DN
15
15
TILT 5
5
MAP
GAIN
TFR WX WX+T MAP GCS
0 GAIN
5
5
15
DN
UP
15
LEFT
WX WX+T MAP GCS
LR/T RR/T TEST
RIGHT
TFR
AFT AISLE STAND
2
3
4
6
5
1
April 01, 2001
747 Operations Manual
Flight Management, Navigation -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.10.13
WX + T (weather + turbulence) - displays weather returns and turbulence within
precipitation with gain controlled automatically. Turbulence display available
with display ranges of 40 nm or less.
Note: Turbulence detection requires presence of detectable precipitation. Clear
air turbulence cannot be detected by radar.
MAP - displays ground returns at selected gain level.
5 Ground Clutter Suppression (GCS) Switch
IN - reduces amount of ground returns.
OUT - returns radar to normal operating mode.
Note: Continuous operation is not recommended; weather return intensity may
be reduced.
6 TEST Switch
Displays maintenance test pattern and any fault messages with WXR selected
(except in PLAN mode). R/T does not transmit.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.10.14 D6-30151-425
Flight Management, Navigation -
Controls and Indicators
Intentionally
Blank
April 01, 2001
747 Operations Manual
Flight Management, Navigation Chapter 11
Navigation Systems Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.20.1
Introduction
Navigation systems include global positioning system (GPS), inertial reference
system (IRS), VOR, DME, ILS, ADF, ATC transponder, weather radar, and the
flight management system (FMS). The FMS is described in the Flight
Management System Description section of this chapter.
Navigation Systems Flight Instrument Displays
Refer to Chapter 10, Flight Instruments, Displays for flight instrument display
system operations and typical instrument displays.
Global Positioning System (GPS)
Left and right GPS receivers independently supply geographical data to the FMC.
GPS tuning is automatic.
GPS Displays
POS REF 3/3 page displays the left and right GPS position. The ND annunciates
GPS when the FMC uses GPS position updates.
Pushing the POS (position) switch on the EFIS control panel displays left and
right GPS positions on the ND. The GPS symbols are identical and display as a
single symbol when the GPS receivers calculate the same position.
GPS Data
The FMC uses GPS position data to estimate errors in the inertial reference system
(IRS) position and velocity. The flight crew can manually inhibit GPS updating.
This is accomplished on the CDU POS REF 2/3 page.
GPS position updates are allowed for all United States National Airspace
approach operations. Outside of this region, GPS position updates are allowed
during approaches only if the FMC database and approach charts are referenced
to the WGS-84 reference datum. GPS updates should be inhibited for all other
approach operations, unless other appropriate procedures are used.
December 01, 1999
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