MAINTENANCE
Honeywell %%!+%.
8.1 B. (8)
TEST -
Wx -
GMAP -
Standby should be selected anytime it is desired to keep
power on the system without transmitting.
The PRIMUS@ 870 contains a forced standby function (FSBY).
This permits an external
system, such as the squat switch,
to force the radar into standby automatically. If this
occurs, the
mode FSBY will be displayed. If this function
is wired, and should it operate, the user may override it
by selecting another mode. In systems with dual
controllers, this must be repeated on the second controller
(-413/414 Controllers only).
Used to select a special test pattern to allow verification
of system operation; 100-mile range is automatically
selected; TEST is displayed in mode field. Transmitter
outrmt Rower is radiated in TEST mode.
Any faults present
will be displayed when selecting TEST mode. See
Table 8-6.
Used to select weather detection operation. If selected
prior to end of the warmup period, WAIT will be displayed
until the transmitter warms up (approximately 50 seconds).
WX is displayed in mode field. Transmitter outcmt Dower is
radiated in the WX mode.
In the WX mode, four
precipitation levels are displayed as green, yellow, red,
and magenta.
The cn”ound-maDDinaoDeration is selected bv settina the
mode-control to G~P;
The TILT control is-turned down
until the desired amount of terrain is displayed. The
degree of down-tilt will depend upon the aircraft altitude
and the selected range. The receiver STC characteristics
are altered to provide equalization of ground-target
reflection versus range.
As a result, the selection of
preset GAIN will generally provide the desired mapping
display. However, the pilot may desire to decrease the
gain manually by selecting manual gain and rotating the
GAIN control. Transmitter outDut Dower is radiated in MAP
mode.
Range -
Rotary control used to select one of six ranges (10 to 300
nautical miles).
The control also has a seventh position FPLN.
Selection of FPLN causes the radar information to be blanked from
the navigation display.
The display will also be set to a range
which is pin-programmable at the J2 connector of the controller.
The radar continues to transmit in the mode selected. The EFIS
will use the SCI bus from the controllers for range selections if
available, otherwise the EFIS will use the range discretes from the
controller.
(9) TILT
- Single-turn rotary control which varies antenna tilt between
15 degrees up and 15 degrees down. The range between +5 and -5
degrees is expanded for ease of setability.
22-14-00
Page 198.95
Aug 15/91
Use or disclosure of information on this page is subject to the restricflons on the title page of this document.
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