LIGHT activity approximates 8 strikes/min average or less.
MEDIUM activity approximates 9 to 25 strikes/min average.
HEAVY activity approximates 26 strikes/min average or higher.
ALERT If a cell has an Intensity of Lightning Alert, then the
HEAVY activity icon will be displayed in magenta with a black
Figure 3-15. Lightning Sensor Display Icons
b. Lightning Alert System. It is possible to see lightning lash visually, and see no change in the display. This
is normal, because, unless one of the rate thresholds are crossed, there will be no change in the symbol, other
than a slight position update. The lightning alert function shows the operator that the unit is operational, and shows
real-time lightning activity. The lightning alert function places a magenta rate-one symbol near the outer range mark
of the display, at the proper bearing, for each lightning lash. The lightning alert symbol is displayed for ive seconds,
and gives the operator conidence that the system is functional even though there may be no change in the white
lightning rate symbols. It is also an indicator of real-time activity.
c. Lightning Sensor System Mode Annunciations. The following mode annunciations appear on the MFD
Lightning Sensor System Annunciations
Invalid storm data (Note 1)
A fault has been detected within the system
Indicated when the "CLR" button has been pressed
Mic key stuck
Loss of heading data to Lightning Detector system
NOTE 1: Storm cell data is invalid and not displayed if an entire valid storm cell ile is not received for
approximately 4 seconds.