(28)
Rotate control panel ANT TILT control and observe that antenna may be positioned from 14 degrees above zeroed position to 14 degrees below zeroed position.
(29)
At control panel, select OFF position. Make certain that OFF position is maintained so that personnel are not struck by antenna, then check that all switches on the antenna are placed in their normal operating positions. Disable transmitting section of R/T's by selecting XMTR OFF switch positions at R/T units.
(30)
Observing radiation and physical movement precautions at antenna, select NOR (NORM) mode at control panel, then check R/T's again to make certain that XMTR switches are in OFF position. Observe that antenna scans normal | 90. dead ahead sector.
EFFECTIVITY
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34-43-00
(31) If no further observations of the antenna are anticipated, close nose radome. Insert 5/16-inch allen wrench into each of six latches, depress and turn clockwise until latched. Be sure depressed inner latch returns to its original position (even with airplane skin). Refer to nose radome closing procedures in 34-43-03.
D. Test Weather Radar System in Radiating Mode
(1) For check of system in a radiating mode, select NOR (NORM) mode at pilots' weather radar control panel. Make certain that XMTR switches at R/T units are in ON position.
WARNING: DO NOT OPERATE WEATHER RADAR WHILE THE AIRPLANE IS BEING
_______ REFUELED OR DEFUELED AND DO NOT OPERATE IN ANY RADIATING MODE WHILE A FUELING OPERATION IS BEING CONDUCTED WITHIN 300 FEET OF THE ANTENNA OR AN EXPLOSION MAY OCCUR.
PERSONNEL MUST NOT ENTER AN AREA CLOSER THAN 50 FEET OF A RADIATING ANTENNA OR INJURY TO PERSONNEL MAY OCCUR.
CAUTION: WHEN THE WEATHER RADAR IS OPERATED IN ANY MODE OTHER THAN
_______ STANDBY OR TEST, DIRECT THE NOSE OF THE AIRPLANE SO THE FORWARD 180-DEGREE SECTOR IS FREE OF LARGE METALLIC OBJECTS (HANGERS, TRUCKS, OTHER AIRPLANES, ETC.) FOR A DISTANCE OF 300 FEET AND TILT THE ANTENNA UPWARD 14 DEGREES OR DAMAGE TO RECEIVER MAY OCCUR.
(2)
Adjust indicator sweep intensity contol CW to obtain a sweep display. On control panel, set GAIN to AUTO or NORM. Adjust other indicator controls as required to obtain radar video.
(3)
Look for a target video return.
NOTE: A mountain range or well-defined hills in the background
____ or other large objects, rainfall, etc., may be used to obtain the return. Adjust range control for optimum display.
(4)
Observing large video targets or heavy rainfall acquired in the NOR(M) mode, in previous step, select contour mode at control panel and observe that video inverts (light target becomes dark in light background).
(5)
Observing ground targets acquired in the NOR (NORM) mode, select MAP and observe that certain video targets may become larger and more targets may appear on display (cosecant-squared beam instead of pencil beam).
(6)
Repeat radar video tests with system No. 2 selected at the control panel.
(7)
If no further use of the weather radar system is anticipated, shut down the radar system first and then shut down the INS in accordance with procedures at end of Operational Tests.
EFFECTIVITY
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(8) Remove electrical power if no longer required. Refer to 24-22-00. Restore airplane to normal operating configuration. Make certain that nose radome is closed and secured for flight operation.
EFFECTIVITY
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WEATHER RADAR SYSTEM - ADJUSTMENT/TEST
______________________________________
1. General_______
A. An operational test may be performed to determine that the weather radar system is ready for operation. In the operational test, the transmitter sent the rf output pulses into a dummy load and a test pattern is observed instead of regular radar display. Also, antenna stabilization is tested through the use of internal self test facilities.
B. The system check of the weather radar system checks the response accuracy of the antenna to pitch and roll signals from the INS system, and some transmit mode tests. The operational test is a portion of the system test, and should be performed first. The system tests are performed as a periodic maintenance function, or may be performed separately as aids to fault isolation.
WARNING: DO NOT OPERATE WEATHER RADAR WHILE THE AIRPLANE IS BEING
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