AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 38
2-18-45
Page
7
Code
01
AOM-145/1114
WEATHER RADAR OPERATING MODES AND
FUNCTIONS
TEST MODE (TST)
After the radar warm-up period is over, the TEST mode may be
selected. A special test pattern made up of color bands is displayed. A
series of green/yellow/red/magenta/white bands indicate that the
signal to color conversion circuits are operating normally. A 100-mile
range is automatically selected. A green TEST label will be displayed
on the PFDs’ and MFDs’ radar mode field.
When the airplane is on the ground and the TEST mode is entered,
the first page always includes RADAR OK or RADAR FAIL to indicate
the current state of the radar, as follows:
RADAR OK: indicates that no faults were found and the radar is ready
for service. It is combined with the END OF LIST page.
RADAR FAIL: indicates a radar fault.
During the weather radar test, several fault messages may be
presented to the crew. The POC (Power On Counter), aside recording
an existing fault, also stores fault information from previous power-on
cycles. However, if the first page announces "RADAR OK", the radar
is ready for service.
STANDBY MODE (SBY)
The standby mode should be selected any time it is desired to keep
the system powered without transmitting. When SBY mode is selected
the WX radar remains in a ready state, with the antenna scan
motionless and stowed in a tilt-up position. In addition, the transmitter
is inhibited and the display memory is erased.
For airplanes equipped with dual control panel, placing only one
controller in SBY does not shut the transmitter OFF. Instead, the no-
SBY controller governs radar operation. If both controllers are placed
in SBY, the transmitter is shut OFF.
In standby mode a STBY label is displayed on the PFDs’ and MFDs’
radar mode field.
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