preset gain. When REACT is selected, the blue
RCT legend is displayed in the mode field. The
REACT circuitry compensates for attenuation
of the radar signal as it passes through rainfall.
The cyan field indicates areas where further
compensation is not possible. Any target de-
tected within the cyan field cannot be cali-
b r a t e d a n d s h o u l d b e c o n s i d e r e d v e r y
dangerous. All targets in the cyan field are dis-
played as 4th level precipitation, magenta.
GMAP (Ground Mapping)
Selecting GMAP places the radar system in the
ground mapping mode. The system is fully
operational and all internal parameters are set
to enhance returns from ground targets. RCT
compensation is inactive.
Weather-type targets are not cali-
brated when the radar is in the GMAP
mode. Because of this, the pilot
should not use the GMAP mode for
weather detection
As a constant reminder that GMAP is selected,
the blue GMAP legend is displayed and the
color scheme is changed to cyan, yellow, ma-
genta. Cyan represents the least reflective re-
turn, yellow is a moderate return and magenta
is a strong return.
If GMAP is selected prior to the expiration of
the initial R/T/A warmup period (approxi-
mately 45 seconds), the blue WAIT legend is
displayed. In WAIT mode, the transmitter and
antenna scan are inhibited and the memory is
erased. Upon completion of the warmup pe-
riod, the system automatically switches to
GMAP mode.
FP (Flight Plan)
Flight plan places the WX transmitter in
standby and allows the EHSI or MFD map
range to be selected up to 1000 NM.
TST (Test)
Selects the radar test mode. A special test pat-
tern is displayed to allow verification of sys-
t e m o p e r a t i o n . T h e b l u e T E S T l eg e n d i s
displayed in the mode field.
The tramsmitter is on and radiating X-
band microwave energy in test mode
Refer to maximum permissible expo-
sure level (MPEL) in this Appendix.
The system performs only functions
of weather detection or ground map-
ping. It should not be used nor relied
upon for proximity warning or anti-
colision proteciton.
FORCED STANDBY
Forced standby is an automatic, nonselectable
radar mode. The controllers are wired to the
weight-on-wheels (WOW) switch. The R/T/A
is in forced standby mode when the aircraft
is on the ground. In the forced standby mode,
the transmitter and antenna scan are both in-
hibited, the memory is erased and the blue
STBY legend is displayed in the mode field.
When in the forced standby mode, pressing
both range buttons simultaneously restores
normal operation.
NOTE
When dual weather radar controllers
are installed, both controller's range
bu t t o n s m u s t b e s i m u l t a n e o u s l y
pressed to restore normal operation.
Forced standby mode is a safety feature that in-
hibits the transmitter on the ground to eliminate
the X-band microwave radiation hazard.
WARNING
CAUTION
16A-41
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
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