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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-062
 (4)  Close these circuit breakers.
 (a)  
P18 Load Control Center - Left
 1) ATC 1
 2) DADC LEFT
 3) ALTM CAPTAIN

 (b)  
P6 Load Control Center - Right
 1) ATC 2
 2) DADC RIGHT
 3) ALTM FIRST OFFICER

 F. Test ATC System
 S 865-138
 CAUTION:_______DO NOT USE CODES 7500, 7600-7677, AND 7700-7777. THESE ARE THESE ARE EMERGENCY CODES.
 (1)  Set the switches on ATC control panel as follows:
 (a)  
Transponder Select - Applicable system

 (b)  
Altitude Reporting - OFF

 (c)  
Code Select - 0000

 S 715-063
 (2)  
Do the ATC system Operational Test

 S 865-064

 (3)
Set the PWR switch on the test set to AC or BAT as applicable.

 NOTE: For information about battery test, timing and recharging,
____ refer to operation section of ATC-600A test set operators manual.
 (a) Make sure the display of the test set shows 0000.
 G. Sensitivity Test
 S 215-065
 (1)  On the test set, make sure the % REPLY is 100.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT MODE S ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-067
 (2) Adjust the XPDR SIG control until % REPLY is approximately 90%.
 NOTE: The XPDR SIG control must be between 69 and 77 (ATC
____ transponder system minimum triggering level).
 S 865-066
 (3)  Turn the XPDR SIG control fully counterclockwise.
 NOTE:____The % REPLY indication might not be stable. This is a result of the test set input gain set at the minimum threshold level which cause the test set to respond to the transponder interrogations with difficulty. A stable % REPLY indication is not necessary.
 S 865-068
 (4)
Set the altitude reporting switch on the ATC control panel to ON.

 S 865-069

 (5)  
Set the control on the test set to A/C ALT.

 S 715-070

 (6)  
Do the sensitivity test again.

 (a)  Make sure the XPDR SIG control indication does not differ by more than 1.
 S 865-071
 (7)  
Turn the XPDR SIG control fully counterclockwise.

 S 865-129

 (8)  
Set the control on the test set to A/C CODE.

 H. Slide Lobe Suppression Test
 S 865-072
 (1)  Adjust the XPDR SIG control on test set to 3 db above minimum triggering level.
 NOTE: It may be necessary to decrease the distance between the
____ test set antenna and ATC antenna to get 3 db above the minimum triggering level.
 S 865-073
 (2)  Set the SLS switch on the test set to 0 db.
 (a)  Make sure the transponder stop all replies.
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A
737-300/400/500MAINTENANCE MANUAL
 S 865-074
 (3)  Set the SLS switch on test panel to -9 db.
 (a)  Make sure the test set % REPLY indication shows at least 90% reply.
 S 865-075
 (4)  Turn the test set XPDR SIG control fully counterclockwise.
 I. Frequency Test
 S 865-076
 (1)  
Set the test set FREQ/POWER meter switch to FREQ.

 S 865-077

 (2)  
Set the altitude reporting switch on the ATC control panel to the OFF position.

 S 865-081

 (3)  
Set the ATC ID code to 0000.

 (a)  Adjust the gain control on test set for a mid-scale indication of FREQ/POWER meter.
　
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