PRIMUSr 880 Digital Weather Radar System
10 BRT (Brightness) or BRT/LSS (Lightning Sensor System)
The BRT knob is a single- turn control that adjusts the brightness of the display. Clockwise (cw) rotation increases display brightness and counterclockwise (ccw) rotation decreases brightness.
An optional BRT/LSS four- position rotary switch selects the separate LSZ- 850 Lightning Sensor System (LSS) operating modes and the brightness control on some models. Its LSS control switch positions are as follows:
DOFF - This position removes all power from the LSS.
DSBY (Standby) - This position inhibits the display of LSS data, but the system accumulates data in this mode.
DLX (Lightning Sensor System) - In this position the LSS is fully operational and data is being displayed on the indicator.
DCLR/TST (Clear/Test) - In this position accumulated data is cleared from the memory of the LSS. After 3 seconds the test mode is initiated in the LSS. Refer to the LSZ- 850 Lightning Sensor System
Pilot’s Handbook, for a detailed description of LSS operation.
11 TILT
The TILT knob is a rotary control that is used to select the tilt angle of the antenna beam with relation to the horizon. CW rotation tilts beam upward to +15_; ccw rotation tilts beam downward to - 15_.
A digital readout of the antenna tilt angle is displayed on the CRT, with 0.5_ resolution.
DPULL ACT (Altitude Compensated Tilt) Function - When the TILT control knob is pulled out, the system engages the ACT. In ACT the antenna tilt is automatically adjusted with regard to the selected range and barometric altitude. The antenna tilt automatically readjusts with changes in altitude and/or selected range. In ACT, the
tilt control can fine tune the autotilt setting by ±2°.
ACT is annunciated with an A following the digital tilt readout. The digital tilt readout always shows the commanded tilt of the antenna regardless of the tilt command source (ACT command or manual tilt
command).
WARNINGS
1.TO AVOID FLYING UNDER OR OVER STORMS, FREQUENTLY SELECT MANUAL TILT TO SCAN BOTH ABOVE AND BELOW YOUR FLIGHT LEVEL.
2.ALWAYS USE MANUAL TILT FOR WEATHER ANALYSIS.
A28- 1146- 102- 00 | Operating Controls |
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