Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 4-7
L. Any unacceptable interference should be addressed prior to delivery to the
customer.
4.6 SUPPRESSION CHECK
This check is designed to insure the TCAD and DME Suppression are connected.
Without transponder suppression, some traffic may not be displayed on the TCAD.
A. Turn off all avionics except the transponder. Interrogate the transponder with
a Mode A/C tester.
NOTE: Interrogate for Mode A/C even if the aircraft is equipped with a Mode S
transponder.
B. Note the % reply meter on the tester.
C. Adjust the tester antenna so the meter shows 50% replies, then move the
antenna toward the transponder antenna until it shows 100% replies.
NOTE: The purpose of the antenna movement is to insure the % reply meter is
sensitive enough to measure suppression.
D. Turn on the DME. Observe the % reply meter. The % replies should slightly
decrease, indicating connection and operation of DME suppression.
E. Turn off the DME.
F. Turn on the TCAD, and enable the Technician Self-Test routine (Para. 4.9).
G. While in the technician test routine, press the DATA button to place a square
wave on the suppression line.
H. Verify the % reply decreases, showing operation of TCAD suppression.
I. Turn off the TCAD.
4.7 CUSTOMER CARE CHECKLIST
After installation, attention to the following items will help ensure a satisfied customer.
A. Clean: The Display may be cleaned with a damp cloth.
B. Checkout: Complete and satisfactory.
C. Preset Settings: The factory-preset settings should be enabled (see Paragraph
1.4).
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