h) CAL - Displayed, in blue characters directly below antenna tilt/STAB, when system GAIN control switch is not set to AUTO. Displayed in yellow characters, when R/T receiver gain out of calibration.
i) MIN, 1 thru 9, MAX - Displayed in blue characters below the CAL message when the control panel GAIN switch is clockwise of the detent AUTO position.
(7) Indicator Mode Displays (Fig. 5)
(a) The indicator mode displays are described as follows:
1) WX (weather) - The indicators show areas of heaviest rainfall in red, the next lower level of rainfall in yellow, and the least rainfall in green.
2) SN 352-399, TURB (turbulence) - the indicators display turbulence return in magenta which indicated area of rainfall and winds within 40 miles of the airplane. Weather returns are also shown for all ranges.
3) MAP - the indicators display terrain mapping returns in red, yellow and green.
4) XXX FAULT - Displayed, in yellow characters, when a mode other than TEST is selected and one or more of the following LRUs fail:
1.
R/T
_
2.
ANT
_
D. Self Test (Fig. 6)
(1)
Self-test is initiated when the TEST mode is selected with the control panel mode selector switch. During the self-test operation the transmitter transmits for 4 seconds to verify proper operation of the transmitter then turns off. A test pattern will be present on both indicators.
(2)
If the test fails, the indicators display one or more of the following fault messages in field G as shown in Fig. 6.
1.
R/T - R/T fault
_
2.
ANT - Antenna fault
_
3.
ATT - Attitude input fault
_
4.
IND - Indicator fault
_
5.
COOL - R/T cooling fault
_
(3) System self test fault analysis results may also be obtained by using the TEST switch on the R/T front panel. When the TEST switch is pressed and held all 7 fault indicators will come on momentarily and then go off except the LED displaying a fault. When the TEST switch is released all fault indicators go off.
(a)
R/T - R/T fault
(b)
ANT - Antenna fault
(c)
IND - Indicator fault
(d)
CONT - Control panel fault
(e)
WG SW - Waveguide switch fault
(f)
GYRO - IRU input fault
(g)
AIR - R/T overheat
(h)
A normal indicator test pattern is displayed on the indicators as shown in Fig. 6.
EFFECTIVITY
AF 121, 122; SN 351-399 CONFIG 3 01 Page 29 Apr 25/9834-43-00
FIELD A FIELD E FIELD C 4 COOL RNG TEST 10 MIN CAL 0.0 MRK 5 FIELD H FIELD F FIELD D FIELD B RED
YELLOW
GREEN
3 1
FIELD E FIELD A FIELD C COOL RNG 10 TEST MIN CAL 0.0 MRK 5 FIELD H FIELD F FIELD D FIELD B RED MAGENTA
YELLOW
GREEN
3 2
FIELD G 3 COOL FAULT R/T FAULT CON FAULT IND FAULT ATT FAULT ANT FAULT YELLOW
1 2 3 4 AF 121,122; RNG IS 15 SN 352-399 AREAS ARE DARK (NO COLOR) SHOWN REVERSED FOR ILLUSTRATION PURPOSES Figure 6 Weather Radar Test Patterns and Message Field Display SN 351; AF 121,122
EFFECTIVITY AF 121,122; CONFIG 3 SN 351-399799 Page 30
34-43-00
Sep 25/94
(4) If the test fails, fault messages will appear on the weather radar indicator. The weather radar test pattern will be removed.
E. System Shutdown Procedures
(1)
Position the controls on the weather radar control panel as follows.
(a)
AF 121, 122;
SYS switch - OFF
(b)
SN 351-399;
SYS switch - 1
(c)
TILT control - 0 degrees
(d)
GAIN - AUTO
(e)
AF 121, 122;
Mode selector switch - OFF
(2)
On weather radar indicator set controls as follows:
(a)
Range selector - OFF
(b)
BRT - fully counterclockwise
(c)
On 351,
SCAN/HOLD switch - SCAN
(3)
Shut down inertial navigation system (Ref 34-41-00).
(4)
Remove external electrical power if no longer required
(Ref 24-22-00, Maintenance Practices - Apply Power).
