AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 38
2-18-45
Page
11
Code
01
AOM-145/1114
TURBULENCE DETECTION FUNCTION (TRB) (P-880 MODEL
ONLY)
When this mode is selected, the radar processes return signals in
order to determine if a turbulence condition is present. Areas of
potentially hazardous turbulence are displayed as white. Any areas
shown as turbulence should be avoided.
Turbulence detection function may only be engaged in the WX mode
and at selected ranges of 50 NM or less. When the TRB function is
active, a T letter will be displayed on the PFDs’ and MFDs’ radar mode
field.
CAUTION:
ALTHOUGH TURBULENCE MAY EXIST WITHIN ANY
STORM CELL, WEATHER RADAR CAN ONLY DETECT
TURBULENCE IN AREAS OF RAINFALL.
TARGET ALERT (TGT)
Target alert is selectable in all but the 300-mile range. When selected,
target alert monitors for red or magenta weather beyond the selected
range and 7.5° on either side of the airplane’s heading. If such
weather is detected within the monitored area and outside the selected
range, the target alert annunciation TGT label changes from a green
armed condition to an yellow TGT alert condition on the PFDs’ and
MFDs’ radar mode field. This annunciation advises the flight crew that
potentially hazardous targets lie directly in front and outside of the
selected range. When this warning is received, the flight crew should
select longer ranges to view the questionable target.
The target alert is inactive within the selected range. Selecting target
alert forces the system to calibrate gain, and turns off the variable gain
mode. Target alert can only be selected in WX and FP modes.
NOTE: Keep TGT alert enabled when using short ranges. This allows
the issuing of an alert if a new storm cell develops ahead of the
airplane’s flightpath.
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