737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
11.10.28
MN-FLT-OH-201
• WX – displays weather radar returns without threat information.
• WX+T (threat) – displays: weather radar returns and turbulence in
manual mode and weather radar returns and threats in auto mode.
Turbulence is displayed out to 40 nm for all selected ranges.
Note:
The WX+T switch must be selected and the WXR set to (AUTO) mode
to show core, associated and path threat assessment, as well as level
2 turbulence and predictive overflight protection.
Note:
Turbulence detection requires presence of detectable precipitation.
Clear air turbulence cannot be detected by radar.
• MAP – displays both ground and weather returns without turbulence
information.
• 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.
• 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.
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
discontinue the test. The PWS test lasts approximately 15 seconds
and completion is indicated with an oral notification.
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.
March 1, 2021
