AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 38
2-18-80
Page
5
Code
01
AOM-145/1114
3 - GO ANNUNCIATOR
The Mode-S/IFF control panel has a dead front green light GO
annunciator to indicate no failures in the system or to indicate a new
transponder message has been received by the control panel.
4 - NO-GO ANNUNCIATOR
The Mode-S/IFF control panel has a dead front amber light NO-GO
warning annunciator to indicate system failure.
5 - TEST BUTTON
The TCAS/IFF control panel is provided with a momentary push-button
test to activate the System Functional Test.
The Mode-S/IFF Transponder System test may be accomplished with
the Mode/TCAS rotary knob in the TA or TA/RA position and pressing
the TEST push button. In addition, the TCAS is tested when the test is
performed.
Pressing the TEST push button the Mode-S/IFF control panel starts a
lamp test, turning all front panel’s LCD indicators segments on.
Additionally, a control panel self-test is performed when the TEST
push button is pressed for more than five seconds.
6 - MASTER CONTROL KNOB
The Master Control knob has OFF, STBY, NORM, and EMER
positions. A mechanical interlock prevents inadvertent switching to
either EMER or OFF positions.
OFF: In the OFF position all primary power supplies are
removed from the system, except control and
lighting circuits.
STANDBY: In the STBY position the system disables the
transponder reply transmit (Modes 1, 2, 3/A, C, and
S). STBY is typically engaged on the ground to
prevent unnecessary RF traffic. It is disengaged
just prior to takeoff and engaged again upon
landing.
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