737 Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
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11.10.28 D6-27370-866-EGP
• GC – temporarily displays ground clutter when radar is in auto mode.
• AUTO – activates the weather radar in multiscan mode:
• both Captain’s and First Officer’s displays are updated
simultaneously
• tilt is automatically controlled
• ground clutter may be temporarily displayed by pushing the GC
switch
• the weather radar automatically increases gain as outside air
temperature decreases
• significantly more gain is available in AUTO than in MAN, if the
GAIN knob is turned to MAX while in AUTO mode the weather
radar will use an additional amount of gain that is not available in
MAN mode.
• Radar System (L/R) Switch – Selects transmitter/receiver system. When
switch is extended (L) left system is selected. When switch is pressed
and in (R) right system is selected.
•TEST –
• activates test mode for both left and right displays
• transmitter is enabled for less than one second and then muted for the
remainder of test
• displays test pattern and any fault messages on navigation display
MAP, center MAP, VOR, and APP modes, with WXR selected.
• with a dual R/T system installed, conduct the test sequence for
system 1 then deselect TEST, switch to system 2 and reselect TEST.
Note: If the airplane is on the ground and the thrust levers are not
advanced for takeoff, WXR tests the predictive windshear system
(PWS) indications. These include PWS caution, PWS FAIL, and
PWS warning. Deactivating WXR on the EFIS control panel will
not discontinue the test and can result in automatic WXR
activation on both pilot displays. The PWS test lasts
approximately 15 seconds.
2 GAIN Control
CAL (calibrated) gain – is selected when the triangle is at the 12 o’clock position.
Rotate clockwise – from the CAL position increases gain in WX, WX+T and
MAP modes.
Rotate counterclockwise – from the CAL position decreases gain in WX, WX+T
and MAP modes.
There is no EFIS indication for CAL gain because CAL gain is the standard gain
setting. The EFIS will display "VAR" when gain is moved above or below the
CAL gain position.
September 15, 2016
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