34-41-01
ALL ú ú 01B Page 13 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
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34-41-01
ALL ú ú 01B Page 14 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
OFF STBY WX CYC MAP OFF STBY WX CYC MAP OFF STBY WX CYC MAP
RANGE TILT RANGE TILT RANGE TILT
RED HEAVIESTRAINFALL
YELLOWNEXTHEAVIESTRAINFALL
GREENLEASTRAINFALL
PUSH DISPLAYED IN CRT MODE FIELD,
WAIT DISPLAYED IN CRT MODE FIELD, IF WX, CYC OR MAP
IF ALL SWITCHES OUT SELECTED DIRECTLY FROM OFF
OFF STANDBY WEATHER
RANGE OFF STBY WX CYC MAP TILT RANGE OFF STBY WX CYC MAP TILT RANGE OFF STBY WX CYC MAP TILT
100
200 25
50
2510 10 10
SET` CYAN MOSTREFLECTIVETARGETS
AZIM
YELLOW
NEXT-LEVEL
REFLECTIVE
TARGETS
MAGENTA
LEAST
SEC
REFLECTIVETARGETS RAINFALL
SCAN ALRT
HEAVIEST RAINFALL TARGET ALTERNATESAT 1 SECOND INTERVALS
CYCLIC AND SECTOR SCAN MAP AND AZIMWEATHER WITH TARGET ALERT
Weather Radar Mode Displays
Figure 4
K09223
A 737-300/400/500MAINTENANCE MANUAL
5) MAP - Depending on the setting of the TILT control, a terrain mapping effect is displayed for identifying terrain features (Fig. 4). The colors cyan (blue), yellow, and magenta represent increasing levels of return for the radar in the MAP mode; the color bar legend, defines these colors. The sensitivity timing control (STC) function in the R/T unit is not operative, allowing better resolution of geographical features. PRESET and variable gain of the GAIN control are both selectable.
6) RANGE switch - Selects one of six operating ranges (in nautical miles) for display on the indicator. The TEST position results in a test pattern display (Fig. 5). The test pattern provides video color circuit checks, R/T receiver and STC checks (by use of a noise band), video/contour circuit checks, and the target alert circuit checks. When TEST is selected, manual operation of the GAIN control is disabled and a fixed-gain condition (the same as the PRESET value) is substituted. The antenna scans in this mode and the waveguide switch rotates to direct radar RF pulses from the R/T into the dummy load.
7) TILT control knob - Tilts the antenna radiator up or down a maximum of 15 degrees from the zero reference position. When the STAB switch is set to OFF, the TILT control setting is referenced from airplane structure boresight zero. When the STAB switch is set to ON, the TILT control setting is referenced from earth horizontally sensed by the inertial reference unit.
8) SEC SCAN (sector scan) pushbutton - Allows antenna to scan at 80 degrees, |40 degrees from dead ahead (Fig. 4) or 160 degrees, |80 degrees from dead ahead. In the 80-degree mode, (pushbutton in) the antenna scanning rate is 28 scans per minute. In the 160-degree mode (pushbutton out), the scanning rate is 14 scans per minute.
9) FRZ (freeze) pushbutton - When FRZ is selected, display is not updated with incoming target return data. To alert the operator, FRZ is displayed, in the lower left corner directly above the mode field, and flashes on and off once each second. FRZ is automatically deactivated with the selection of a different control setting.
10) STAB (stabilization) switch - Allows selection of antenna stabilization from the inertial reference system. When the STAB switch is OFF, the antenna sweep is centered on the zero boresight of the airplane. When the STAB switch is on, the weather radar system uses pitch and roll signals from the inertial reference system to stabilize the antenna sweep to earth horizontal.
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