Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 4-2
4.3.1 SETUP WHEN TCAD IS ISOLATED FROM THE AIRCRAFT
A. Using the instructions in Paragraph 4.8, set up the unit for operation on the
bench, simulating an altitude of 6,700 feet. It is not necessary to connect the
antenna.
B. Set the power supply to 13.75VDC.
C. When TCAD is installed in the aircraft, no set up is required for the
computer test.
4.3.2 COMPUTER TEST PROCEDURE
CAUTION: Check power level and wiring before applying power.
A. Depress the Power Switch on the TCAD. After initialization, the Display will
show 6700 FT SRCHNG (TCAD will show field elevation if the test is
performed in the aircraft). The letter "G" will appear in the lower right cell
indicating operation in the Ground mode.
B. To check the barometric pressure adjustment feature, depress any mode
button, then either the s or t button. The barometric pressure setting will
be shown. Confirm that the barometric pressure can be adjusted by holding
either button down for more than 1 second. Increase the barometric pressure
setting 0.2 inches. Verify that the altitude display increases by at least 100
feet. Return the Barometric pressure setting to 29.92.
C. Depress both s and t buttons simultaneously to display the Altitude
Alert feature. Use the up button to set 6,700 feet (or field elevation if
performed in the aircraft). Depress both s and t buttons again. A small
upper case "A" will appear on the Display. (See Figure 3-2).
D. Depress the ENRT button. The mode indicator will indicate the ENRT
Mode (See Display Symbols, Figure 3-1).
E. Depress the MUTE button. A small upper case "M" will appear on the
Display for about 30 seconds.
F. Depress the TRML and STD buttons simultaneously. The letter "G" will
appear in the lower right cell.
G. Depress the ENRT and STD buttons simultaneously. The letter "U" will
appear in the lower right cell. ("U" will not appear if traffic is within ENRT
shield).
H. Depress STD. The indicator for STD mode will replace the “U”.
I. Depress MUTE twice. Verify audio is present and at an acceptable level.
(When TCAD is installed in the aircraft).
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