Beechcraft C-12C Operator And Technical Reference Manual page 242

TM 1-1510-218-10
c. RAD TEST / OUT Switch – OUT.
(4) Transponder Set Identification Position
Operating Procedure. The transponder set can make
identification-position replies while operating in code
modes 1, 2, and/or 3/A, in response to ground station
interrogations.
1. MODES 1, 2, and/or 3/A – ON, as
required.
Holding circuits within the transponder
receiver/transmitter
identification/position signals for 15 to 30
seconds. This is normally sufficient time
for ground control to identify the aircraft's
position. During this time, it is normal
procedure to acknowledge via the aircraft
communications set that identification/
position signals are being generated.
Set any of the M1, M2, M3/A, M-C, or MODE
4 switches to OUT to inhibit transmission
of replies in undesired modes.
With the IDENT / OUT / MIC switch set to
the MIC position, the POS IDENT button
3-88
NOTE
will transmit
must be pressed to transmit identification
pulses.
2. IDENT / OUT / MIC Switch – Press
momentarily to IDENT, when directed.
(5) Shutdown Procedure.
1. To retain mode 4 code in external
computer
shutdown,
procedure.
a. MODE 4 CODE Switch – Rotate to
HOLD and wait 15 seconds.
b. MASTER Control – OFF.
2. To zeroize the mode 4 code in the
external computer, turn MODE 4
CODE switch to ZERO.
3. MASTER Control – OFF.
automatically zeroize the external
computer unless codes have been
retained (Step 1 above).
during a temporary
perform the following
This will