(a)
Adjust the XPDR SIG control on test set to 3 dB above minimum triggering level.
NOTE: If the transponder's sensitivity is near the insensitive limit, it may be necessary to move antennas closer together in order to get 3 dB above minimum triggering level. At closer than normal antenna spacing, re-establish the dial setting for MTL and adjust the dial 3 dB above MTL and make the SLS test.
(b)
Position SLS switch on test set to 0 dB. Transponder shall stop all replies.
(c)
Position SLS switch on test panel to -9 dB. Transponder shall reply to at least 90% (minimum) to 100% as indicated on test set % REPLY meter.
(d)
Turn test set XPDR SIG control fully counterclockwise.
(6)
Test transmitter frequency as follows:
(a)
Set test set FREQ/POWER meter switch to FREQ.
(b)
On ATC control panel, select code 0000 and position ALT RPTG switch to OFF.
(c)
Adjust gain control on test set for a mid-scale indication of FREQ/POWER meter. Rotate frequency control for a peak indication of meter. Frequency control dial shall read 0 ± 3.
(7)
Test transponder code capability as follows:
(a)
On ATC control panel, rotate code selector knobs to any code desired. Test set numerical display should readout selected code.
WARNING: DO NOT USE CODES 3100, 7500, 7600, 7700. THESE ARE EMERGENCY CODES.
(b)
Change code selection on ATC control panel to test code compliment. Compliment of test code is 7777 minus test code being used. This checks full code capability of transponder under test.
EXAMPLE: If test code being used is 0340, compliment is
7777
-0340
7437 compliment
(c)
On ATC control panel, activate IDENT. IDENT lamp on test set should come on.
(8)
Test altitude reporting as follows:
(a)
Connect pitot-static test kit to appropriate PITOT/STATIC system.
WARNING: REFER TO PRECAUTIONS IN CHAPTER 34-11-0, PAGE 501 PRIOR TO OPERATING PITOT-STATIC EQUIPMENT FOR THESE TESTS.
(b)
Position controls on test set as follows:
Mode - A/C ALT
XPDR SIG - Fully CCW
SLS - Center Position
PWR Switch - On
(c)
On ATC control panel, select ALT RPT and ALT source.
(d)
Using air data test set and altitude reporting code list (Fig. 501), apply a static pressure to obtain test altitudes (between 0 and 35,000 ft) to verify following: 1) Binary code lines (A1 thru C4 and D4) between transponder and altitude source
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503
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are not open or shorted to ground. 2) Appropriate altimeter is within tolerance (Ref 34-12-0). 3) At each altitude, the difference between ATC test set display and altimeter
reading does not exceed ± 125-ft.
NOTE: 1. A test altitude above 30,800 feet is required for check of D4 pulse.
2. The altimeter reading may be increased or decreased to see if 125-ft tolerance can be met PROVIDED the ATC test set continues to display the designated altitude.
(e) Repeat step (d) decreasing altitude to field elevation.
(9)
Repeat step (8) if ATC system has ALT source 1-2 selection.
(10)
Position function switch ATC control module to OFF/STBY as appropriate.
(11)
If no longer required remove electrical power.
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Altitude Reporting Codes 503
34-53-0 Figure 501 (Sheet 1) Jun 20/83
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503 Altitude Reporting Codes
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Altitude Reporting Code 503
34-53-0 Figure 501 (Sheet 3) Jun 20/83
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503 Altitude Reporting Code
Jun 20/83 Figure 501 (Sheet 4) 34-53-0
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