AT ALL; AZ ALL; LH ALL; CONFIG 1 AF 157, 161; IB 406-499 ATG A Page 503 Sep 25/94
34-43-00
(a)
The display from 0 to 50 nautical miles should be composed of five video bands in the order; green, yellow, red, yellow, green. A malfunction in either the R/T or the antenna which activates the T/R or ANT fault lamp(s) on the R/T will also cause the disappearance of the video test bands in the TEST mode.
(b)
The display from 50 to 100 nautical miles should be dark with light noise (green) between the -30 degrees and +30 degrees azimuth lines. This display sector indicates an operational STC circuit.
(c)
The display from 100 to 180 nautical miles is dark with light noise (green) occurring outside the -30 degrees to +30 degrees sector. Within this sector, the tunnel diode amplifier (TDA) is turned off and no noise should be visible.
(18)
A VSWR fault will cause a periodic break-up in the indicator display.
(19)
AF 157, 161; AZ 201-224, Partially cover photocell (if provided) at top of each indicator and observe that display brightness decreases.
(a) Operate TILT control on control panel over its full range of 15.UP and 15. DN. Observe that TILT monitor on indicator tracks TILT control.
(20)
At control panel, select system 2 by placing system (R/T) transfer switch to 2.
(21)
Repeat range checks and test pattern checks for system 2.
(22)
If the system tests are to be performed, proceed to the system test procedures. If the system tests are not to be performed, perform the following shutdown procedures:
(a)
At radar control panel, select system 1 on system (R/T) select switch.
(b)
Rotate indicator BRT or BRIGHTNESS controls fully counterclockwise.
(c)
At radar control panel, set antenna TILT to 0 degree.
(d)
At radar control panel, select OFF mode to shutdown radar system prior to shutting down the INS system. If no further use of the INS system is anticipated, shut down properly per 34-41-00 prior to removing power from INS system or airplane.
CAUTION: FAILURE TO SELECT "OFF" ON INS MODE SELECTOR PRIOR TO
_______ REMOVING AIRPLANE POWER WILL CAUSE INS TO AUTOMATICALLY SWITCH TO BATTERY POWER.
(23) Remove electrical power if no longer required. Refer to 24-22-00.
3. System Test - Weather Radar System
__________________________________
A. Equipment and Materials
(1)
INS Platform Tilt Table - 2TSJ60B00002 and INS Tilt Table Adapter -3TSJ60B00002 and test cables, or equivalent
(2)
Personnel warning lights
(3)
Weather Radar R/T Removal Dolly - ME65B40706
B. Referenced Procedures
EFFECTIVITY
AT ALL; AZ ALL; LH ALL; CONFIG 1 AF 157, 161; IB 406-499 01 A Page 504 Sep 25/94
34-43-00
TDA-ON (TUNNEL DIODE AMPLIFIER)
RANGE MARK
150
TDA-OFF (TUNNEL DIODE AMPLIFIER)
100 STC (SENSITIVITY TIME CONTROL)
SELF TEST NOISE SIGNAL 50 VIDEO BANDS
CONTOUR BAND
NORMAL TEST PATTERN (PPI-1L)
TDA OFF
150
100
STC
50 VIDEO BAND
CONTOUR BAND
TDA ON
VIDEO BAND
RANGE MARK
OFFSET TEST PATTERN (PPI-1L)
Self-Test Display
Figure 501 (Sheet 1)
E40046
EFFECTIVITY
CONFIG 1AZ 201-224799 Page 505
34-43-00
Sep 25/94
200 TDA-OFF (TUNNEL DIODERANGE AMPLIFIER)MARK TDA-ON
150 STC100
(SENSITIVITY TIME CONTROL) CONTOUR BAND
VIDEO BANDS
NORMAL TEST PATTERN (PPI-1L)
TDA
OFF 200
150
100
STC
RANGE MARK 50 VIDEO BAND
TDA ONCONTOUR BAND
VIDEO BAND
OFFSET TEST PATTERN (PPI-1L)
Self-Test Display Figure 501 (Sheet 2)
EFFECTIVITY
E40065
CONFIG 1 AF 157,161799 Page 506
34-43-00
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RANGE MARK TDA-OFF
150 CONTOUR BAND 100 PPI-1N INDICATOR VIDEO BANDS 50 1 TDA-ON (TUNNEL DIODE AMPLIFIER) STC (SENSITIVITY TIME CONTROL)
(BLACK) TDA PULSE OFF
RNG 180 MRK 30
GREEN
(GREEN) TDA PULSE ON
YELLOW YELLOW REDGREEN GREEN STC (BLACK) 2
PPI-1T 2
1 2 AT ALL; AZ 231-280; LH ALL; IB 406-499 AZ 225-229,281-299 Figure 501 (Sheet 3) Self-Test Display Pattern
E40066
EFFECTIVITYAT ALL; LH ALL; CONFIG 1 AZ 225-299; IB 406-499799 Page 507
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GAIN ADJ'S
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