EFFECTIVITY CONFIG 4 AF 160,162-171
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MESSAGE SLOT INDICATOR MESSAGE - NORMAL DISPLAY MESSAGE - MALFUNCTION DISPLAY REPLACE
1 "MAP" or "TEST" Selected mode - "WX", Blank display Indicator
2 Blank display "WEAK" Rec/Trans
Blank display "FAIL" Refer to Message slot 4 thru 9
3 "20","40","80","160","240" Selected range - other than selected range Blank display or a number Indicator
4 Green, yellow, and red color bars different color scheme Blank display or a Indicator
"T/R" displayed Rec/Trans
"ANT" displayed Antenna
"DSP" displayed Indicator
Weather Radar Indicator Failure Messages and Faulty LRU
Figure 102 (Sheet 3)
EFFECTIVITY CONFIG 4
AF 183,184
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INDICATOR MESSAGE SLOT MESSAGE - NORMAL DISPLAY MESSAGE - MALFUNCTION DISPLAY REPLACE
5 Blank display for all other modes Gain setting - "MAX", "-01","-02" thru "-08" or "MIN", in map mode only. No change in setting as GAIN control is rotated, map mode only Indicator
6 display blank selected, all other times "IDNT" - when GCS switch when GCS selected Display remains blank Indicator
7 display normally blank Stabilization message - "ATT" reference system Troubleshoot inertial (AMM 34-28)
8 Antenna tilt setting "15.00 thru 15.00 " Blank display, or setting rotated not change when TILT knob Indicator
9 System - blank for system 1, S2 for system 2 S2 message for system 1 or blank for system 2 Indicator
Weather Radar Indicator Failure Messages and Faulty LRU
Figure 102 (Sheet 4)
EFFECTIVITY CONFIG 4 AF 183,184
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(5) GND SPR switch - OFF
I. Position controls and switch on both indicators as follows:
(1)
AF 160, 162-171;
PWR switch - on
(2)
MKR intensity control - midposition
(3)
INT control - midposition
(4)
Range switch - 80
(5)
M/S switch - master mode position
(6)
AF 160, 162-171;
AZ switch - off position (azimuth lines displayed)
(7)
AF 160, 162-171;
HOLD switch - off (mode disabled)
(8)
FWD switch - pressed
3. Weather Radar Trouble Shooting Procedure
________________________________________
A. AF 160, 162-171; Place each indicator PWR switches to off, wait 5 seconds and return both PWR switches to on. Check for the following test sequence on both indicators:
B. AF 183, 184; On control panel, set TEST mode switch to the pressed position. Check for the following test sequence on both indicators.
(1)
Antenna performs complete left-to-right scan-test pattern on indicators from left to right.
(2)
Antenna tilts UP then DN to zero degree - tilt angle on indicator read 15.00 up then 0.00 degree.
(3)
Antenna continues from 0.00 to DN 15.00 degrees then UP and stops at
0.00 degree.
C. Observe each weather radar indicator test pattern display (Fig. 101) for LRU failure messages or malfunction display (Fig. 102).
(1)
TEST appears in top left portion of display (slot 1).
(2)
AF 160, 162-171; A color bar consisting of green, yellow and red appears in upper left-hand corner of indicator (slot 4).
NOTE: In case of failure defective LRU will be displayed below
____ color bar in slots 6, 7, 8, or 9 and word FAIL will appear in upper-center portion of display.
(3) AF 183, 184; A color bar consisting of green, yellow and red appears in upper left-hand corner of indicator (slot 4).
NOTE: In case of failure defective LRU will be displayed in place
____ of the color bar and word FAIL will appear in upper-center portion of display.
(4) Test pattern on indicator displays four color rings; green at bottom, yellow, red and magneta at top with four equally spaced range marks. Azimuth marks should also be present (Fig. 101).
D. AF 160, 162-171;
Select ranges 20, 40, 80, 160 and 320 and check for following:
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