(2)
SN 351-399, With the mode selector on the weather control panel in TEST and check for the following:
(3)
Place mode selector on the weather control panel to TEST and check for the following:
(a)
At forward right equipment center rack E5, R/T mount cooling fan should be operating.
(b)
AF 121, 122, SN 351, test pattern on indicator displays three color bands, green at the bottom, yellow, red at top as shown in Fig. 502. The size of each color band is not critical.
(c)
SN 352-399, Test pattern on indicator displays three color bands, green at the bottom, yellow, red at top and a magenta wedge in the center as shown in Fig. 502. The size of each color band is not critical.
(d)
Azimuth lines, range marks, and alphanumeric messages should be displayed steadily in blue and appear identical to those shown in Fig. 502.
(4)
Rotate BRT control on each indicator. Check intensity of range marks, azimuth lines, numerics, and test pattern changes as control is rotated.
EFFECTIVITY
AF 121, 122; CONFIG 3 SN 351-399 03 A Page 502 Sep 25/94
34-43-00
(5) SN 351-399,
Position range switch on each indicator to each range selection in
succession. Check appropriate range marks and numerics appear with
each selection.
NOTE: Test pattern stays the same for all ranges, since the color____
bands are not related to distance but rather to relative
position on the display.
(a) Range 10, marks displayed 2, mark interval 5
(b) Range 20, marks displayed 4, mark interval 5
(c) Range 40, marks displayed 4, mark interval 10
(d) Range 80, marks displayed 4, mark interval 20
(e) Range 160, marks displayed 4, mark interval 40
(f) Range 320, marks displayed 4, mark interval 80
(6) AF 121, 122,
Position range switch on each indicator to each range selection in
succession. Check appropriate range marks and numerics appear with
each selection.
NOTE: Test pattern stays the same for all ranges, since the____
color bands are not related to distance but rather to
realtive position on the display.
(a) Range 15, marks displayed 3, mark interval 5
(b) Range 30, marks displayed 3, mark interval 10
(c) Range 60, marks displayed 3, mark interval 20
(d) Range 120, marks displayed 3, mark interval 40
(e) Range 240, marks displayed 3, mark interval 80
(7) Rotate TILT control on the weather radar control panel above and
below zero. Check indicator tilt message changes with tilt control
setting.
(8) Return TILT control to 0 position.
(9) Rotate GAIN control on the weather radar control panel out of AUTO
detent position. Check CAL message displayed, in blue, directly
below TEST on indicator.
(10)
Return GAIN control to AUTO position. Check CAL is no longer displayed.
(11)
Open ATT INS-1 circuit breaker on P7 overhead panel. Check the test pattern and alphanumerics disappear with only ATT FAULT displayed on both indicators.
(12)
Close ATT INS-1 circuit breaker. Check ATT FAULT message disappears and test pattern with alphanumerics return on both indicators.
(13)
At control panel, place SYS switch to 2 and repeat operational test for system 2.
(14)
If no further tests are required, perform Weather Radar System Shutdown Procedure.
EFFECTIVITY
AF 121, 122; CONFIG 3 SN 351-399 02 A Page 503 Sep 25/94
34-43-00
RANGE RANGE MARKS
MRK 10
(BLUE)
RNG 40 (BLUE)
0.0
4
TEST ANTENNA TILT MODE OF
(BLUE) OPERATION (BLUE)
RED
RANGE
MARKS
(BLUE)
YELLOW
AZIMUTH
LINES
GREEN
(BLUE)
1 RANGE (BLUE) 3 RANGE MARKS (BLUE)
MODE OF
RNG 40 MRK 10
OPERATION
ANTENNA TILT (BLUE) TEST 0.0 (BLUE)
RANGE MAGENTA
MARKS
(BLUE)
RED
YELLOW
GREEN
AZIMUTH 3
LINES (BLUE)
2
3
R/T FAULT ANT FAULT FIELD G CON FAULT YELLOW ATT FAULT IND FAULT COOL FAULT
1 SN 351; AF 121,122
2 SN 352-399
3
AREAS ARE DARK (NO COLOR) SHOWN REVERSED
FOR ILLUSTRATION PURPOSES
4 AF 121,122; RNG IS 30, RNG MARK IS 10
Weather Radar Test Pattern and Fault Display
Figure 501
EFFECTIVITY 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航3(137)
