Beechcraft C-12C Operator And Technical Reference Manual page 240

TM 1-1510-218-10
(9) IDENT / OUT / MIC Switch.
source of aircraft identification signal.
(a) IDENT – Activates transmission of
identification (IP) pulse.
(b) OUT – Disables IDENT MIC.
(c) MIC – Enables the POS IDENT
button located only on the pilot's side CONTROL
wheel to activate transmission of IDENT signal from
transponder.
(10) MODE 4 REPLY Indicator – Illumination
indicates that a reply has been made to a valid Mode 4
interrogation or will flash when in standby position and
interrogated for Mode 4.
(11) MODE 4 AUDIO / LIGHT / OUT Switch.
WARNING
If the MODE 4 computer is installed in the
aircraft, place the AUDIO / LIGHT / OUT
switch in the AUDIO or LIGHT position
during flight operations. Do not use the
OUT position.
(a) AUDIO – Permits aural and REPLY
light monitoring of valid Mode 4 interrogations and
replies.
(b) LIGHT – Permits REPLY indicator
only monitoring.
(c) OUT – Disables monitoring capability.
(12) MODE 3/A CODE Selectors – Selects the
desired reply codes for mode 3/A operations.
The cover over the MODE select switches
must be slid forward to display the
selected MODE 2 code.
(13) MODE 2 CODE Selectors – Selects the
desired reply code for mode 2 operations.
(14) MODE 1 CODE Selectors – Selects the
desired reply code for mode 1 operations.
(15) MODE 4 TEST / ON / OUT Switch.
(a) TEST – Initiates BIT of Mode 4
operation.
3-86
Selects
NOTE
(b) ON – Enables Mode 4 operation.
(c) OUT – Disables MODE 4 operation.
(16) MODE 4 CODE Control. Selects dialed
in Mode 4 CODE of the day.
(17) M–C TEST Switch.
(a) TEST – Permits self-test in the
selected mode.
(b) ON – Permits set to reply in the
selected mode.
(c) OUT – Disables replies.
(18) M–3/A TEST Switch.
(a) TEST – Permits self-test in the
selected mode.
(b) ON – Permits set to reply in the
selected mode.
(c) OUT – Disables replies.
(19) M-2 TEST Switch.
(a) TEST – Permits self–test in the
selected mode.
(b) ON – Permits set to reply in the
selected mode.
(c) OUT – Disables replies.
(20) M-1 TEST Switch.
(a) TEST – Permits self–test in the
selected mode.
(b) ON – Permits set to reply in the
selected mode.
(c) OUT – Disables replies.
There is a POS IDENT button, located on
the pilot's and copilot's control wheels,
which, when
transponder identification.
c. Normal Operation.
(1) Turn-on Procedure. Set MASTER switch
to STBY. Depending on the type of receiver installed,
NOTE
pressed, activates