Beechcraft C-12C Operator And Technical Reference Manual page 241

the TEST/MON NO GO indicator may illuminate.
Disregard this signal.
(2) Test Procedure.
Make no checks with the master switch in
EMER, or with M-3/A codes 7600 or 7700,
without first obtaining authorization from
the interrogating station(s).
1. Allow set 2 minutes to warm up.
2. Select codes assigned for use in
modes 1 and 3/A by pressing and
releasing the push button for each
switch
appears in the proper window.
3. Lamp Indicators.
test feature.
4. M-1 Switch – Hold in TEST. Observe
that no indicator lights illuminate.
5. M-1 Switch – Return to ON.
6. Repeat steps 4 and 5 for the M-2, M-
3/A, and M-C mode switches.
7. MASTER Control – NORM.
8. MODE 4 Code Control – A.
code in the external computer.
9. MODE 4 AUDIO OUT Switch – OUT.
(3) Modes 1, 2, 3/A, and/or 4 Operating
Procedure.
If the external security computer is not
installed, a NO GO light will illuminate any
time the MODE 4 switch is moved out of
the OFF position.
1. MASTER Control – NORM.
2. M-1, M-2, M-3/A, and/or MODE 4
ON/OUT switches – ON. Actuate only
those switches corresponding to the
required
switches should be left in the OUT
position.
3. MODE 1 Code Selectors – Set, if
applicable.
NOTE
until the desired number
Operate press-to-
NOTE
codes. The remaining
4. MODE 3/A Code Selectors – Set, if
5. MODE 4 Code Control – Set, if
6. MODE 4 REPLY Indicator – Monitor
7. MODE 4 AUDIO OUT Switch – Set as
8. MODE 4 Audio and/or Indicator –
9. IDENT/MIC/OUT Switch – Press to
10. MODE 4 TEST / ON / OUT Switch –
11. Observe that the TEST GO indicator
12. MODE 4 TEST / ON / OUT Switch.
13. ANT Switch – BOT.
14. Repeat steps 4, 5, and 6. Observe
Set a
15. TOP / DIV / BOT / ANT Switch – TOP.
16. Repeat steps 4, 5, and 6. Observe
17. TOP / DIV / BOT / ANT Switch – DIV.
18. Repeat steps 4, 5, and 6. Observe
19. When possible, obtain the cooperation
TM 1-1510-218-10
applicable.
required.
to determine when transponder set is
replying to an SIF interrogation.
required to monitor
interrogations and replies.
Listen and/or observe for Mode 4
interrogations and replies.
IDENT momentarily.
TEST.
light illuminates.
ON.
that the TEST GO
illuminates.
that the TEST GO
illuminates.
that the TEST GO
illuminates.
of an interrogating station to exercise
the TEST mode.
a. RAD TEST / OUT Switch – TEST.
b. Obtain verification
interrogating station that a TEST
MODE reply was received.
Mode 4
indicator
indicator
indicator
from
3–87