S 865-186

 (2)  
Close this circuit breaker.

 (a)  P6 Circuit Breaker Panel:
 1) AIR/GND and LTS

 S 865-256
 (3)  Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 TASK 34-53-02-735-255
 4. System Test - ATC System (With the TIC T-48 or T-49 Test Set)
________________________
 A. General
 (1)  This system test is a more complete check of the ATC system. The system test first does the ATC - Operational Test. Then it uses ground test equipment to examine the left and right ATC systems.
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 B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  
This system test uses the TIC T-48 or T-49 test set to test the functionality of the ATC transponder. The test set can do all the tests automatically or each test individually. Each test shows on the test set as it is done. If a test has failed, the test sequence will stop and a failed message shows. All data will show at the end of the test if the test is successful.

 (3)  
Operation with the antenna coupler, TAP-115, TAP 118, or TAP 125 used with the applicable test set, is necessary when the test to do a check of the output power, receiver, sensitivity and radio frequency. For mode S diversity channel isolation check, the TAP 125 is necessary.

Special Tools and Equipment

 (1)  
ATC Transponder Ramp Test Set TIC T-48 or T-49

 (2)  
RF through-line wattmeter Bird model 43 or equivalent (up to 500

 watts).References

 (1)  
24-22-00/201, Manual Control

 (2)
34-12-01/501, Air Data Computing (ADC) SystemAccess

 (1)  
Location Zones 205 Electronic Compartment 211/212 Flight Compartment 223/224 Area Above Passenger Cabin Ceiling (Exterior)

Prepare for the System Test
 S 845-081
 (1)  
Follow the instructions in the TIC operator's manual and do all necessary calibration.

 S 845-082

 (2)  
Insert the Antenna Coupler over the ATC antenna.

 NOTE: Make sure the orientation of the antenna coupler setup is
____
 correct.

 S 845-083
 (3)  
Connect the antenna coupler connector to the test set antenna connector.

 (4)  
Apply power to the test set and follow operating procedures.

 S 845-085

 (5)  
Make sure these circuit breakers are closed:

 S 845-084
 (a)  P18 Load Control Center - Left
 1) ATC 1
 2) DADC LEFT
 3) ALTM CAPTAIN

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A
737-300/400/500MAINTENANCE MANUAL
 (b)  P6 Load Control Center - Right
 1) ATC 2
 2) DADC RIGHT
 3) ALTM FIRST OFFICER

 S 715-197
 (6)  
Do the ATC Operational Test.

 S 865-198

 (7)  
Open this circuit breaker.

 (a)  P6 Circuit breaker Panel:
 1) AIR/GND and LTS

 S 865-199
 (8)  Set the captain's and first officer's altimeter to 29.92 inches of mercury.
 F. ATC System Test
 S 865-212
 CAUTION:_______DO NOT USE CODES 7500, 7600-7677, AND 7700-7777. THESE ARE EMERGENCY CODES.
 (1)  
Set the code switches on the ATC control panel to a desired ATC ID code.

 S 865-214

 (2)  
Set the transponder select switch on the ATC control panel to the left or No. 1 system.

 S 865-218

 (3)  
Set the altitude reporting switch on the ATC control panel to the 1 position.

 S 735-086

 (4)  
Push the INTERROGATE switch.
　
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