AF 121,122; CONFIG 3
SN 351-399799A Page 504

34-43-00
 Sep 25/94
SEE  A 
RECEIVER/ 
TRANSMITTER
(2 PLACES) 
WAVEGUIDE 
SWITCH  WEATHER 
RADAR 
ANTENNA 
WAVEGUIDE  SEE  B 

SEE C
SEE D SEE C
Weather Radar System Component Location Figure 502 (Sheet 1)
808746
EFFECTIVITY

AF 121,122; CONFIG 3
SN 351-399 799A Page 505

34-43-00
 Sep 25/94
BendixWX RADAR Air Transport Avionics
R/T ANT IND CONT WG SW GYRO AIR
TEST
RADAR TRANSCEIVER RTA-4A
RECEIVER TRANSMITTER CONTROL PANEL
A

ANTENNA PLANAR ARRAY
TO RECEIVER/
TRANSMITTERS
SCAN AND ELEVATION DRIVE DISABLE SWITCHES
ELECTRICAL CONNECTOR
WEATHER RADAR ANTENNA AND WAVEGUIDE
B

Weather Radar System Component Location
Figure 502 (Sheet 2)

EFFECTIVITY

 CONFIG 3
AF 121,122;
799A Page 506
SN 351-399
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 Sep 25/94

INDICATOR

SCAN HOLD SWITCH

Weather Radar System Component Location
Figure 502 (Sheet 3)

EFFECTIVITY

CONFIG 3
AF 121,122;
799A Page 507
SN 351-399
34-43-00
Sep 25/94
E39493
SYSTEM TRANSFER
GAIN CONTROL
SYSTEM
GAIN CONTROL
SYSTEM
GAIN CONTROL
SN 351 SN 352-399 AF 121,122
MODE SELECTOR SWITCH

ANTENNA TILT CONTROL
ANTENNA TILT CONTROL
5 10
CONTROL PANEL

E39498
Weather Radar System Component Location
Figure 502 (Sheet 4)

EFFECTIVITY

CONFIG 3
AF 121,122;
799A Page 508
SN 351-399
34-43-00
Sep 25/94
 3.  System Test - Weather Radar System
__________________________________
 A.  For the tests involving the display of radar video (echoes from terrain, rainfall, etc.), the airplane should be pointed so antenna sector scan includes hills or mountains preferably at various heights in the distance.
 B.  A stabilization test using tilt tables is performed to verify proper system operation. In addition, a stabilization test utilizing the self-test features of the weather radar system may be performed during the weather radar system operational test.
 C.  The system test procedures consist of the following individual tests.
 (1)  
Mode Tests

 (2)  
Indicator Display Test

 (3)  
Gain Tests

 (4)  
Antenna Tilt Test

 (5)  
Stabilization Test (Using Tilt Table)

 D.  Equipment and Materials
 (1)  INS Platform Tilt Table - 2TSJ60B00002 and INS Tilt Table Adapter -3TSJ60B00002 and test cables
 E.  Referenced Procedures
 (1)  
AMM 21-58-00, Equipment Cooling - Adjustment/Test

 (2)  
AMM 24-22-00, Manual Control - Maintenance Practices (Apply Power)

 (3)  
AMM 34-41-00, Inertial Navigation System - Adjustment/Test (Operational Test)

 (4)  
AMM 34-43-00, Weather Radar System - Adjustment/Test (Operational Test)

 (a)  Observe all instructions, cautions and warnings in the operational test.
 F.  Test Weather Radar
 (1)  
Perform system operational test (Ref 34-43-00 A/T).

 (2)  
Mode Test

 (a)  
Check mode messages are present in upper left-hand of indicator when the following weather radar modes are selected with the weather radar control panel mode selector switch. 1) TEST - TEST mode message 2) WX - WX mode message 3) On SN 352-399,

 TURB - TURB mode message 4) MAP - MAP mode message

 (b)  
On control panel, place SYS switch to 2 and repeat test for system 2.

 (c)  
If no further tests of weather radar are required, perform Weather Radar System Shutdown Procedure.

 (3)  
Indicator Display Test

 (a)  
Place control panel mode select switch to WX. Check WX message is displayed in upper left of indicators.

 (b)  
Obtain well defined radar returns on indicators by adjusting control panel tilt control.

 (c)  
Set each indicator range switch to position radar returns in approximate center of indicator.

 (d)  
Indicators should have following information displayed:

 EFFECTIVITY

 AF 121, 122;  CONFIG 3 SN 351-399  02 A Page 509  Sep 25/94

34-43-00
 1) Weather or terrain radar returns in approximate center of
　
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