NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-80
Page
4
Code
01
REVISION 38
AOM-145/1114
IFF TRANSPONDER CONTROLS AND INDICATORS
The Mode-S/IFF control panel is located on the control pedestal and
allows the selection of the Mode-S/IFF transponder operation modes
(Off, Standby, Normal and Emergency), selection of interrogation and
reply modes (1, 2, 3/A, C and S), and selection of codes.
1 - DISPLAY SELECT ROTARY KNOB
The Mode-S/IFF control panel has a six position rotary knob to select
the different display modes.
MODE 1: Selecting “1” with the DPL SEL knob enables Mode 1
display and keypad entry mode.
MODE 2: Selecting “2” with the DPL SEL knob enables Mode 2
display and keypad entry mode.
MODE 3/A: Selecting “3A” with the DPL SEL knob enables the
Mode 3/A display and keypad entry mode.
MODE S: Selecting “S” with the DPL SEL knob enables the
Mode S display and keypad entry mode.
FLIGHT ID: Selecting “FLT ID” with the DPL SEL knob enables
FLIGHT ID display and keypad entry mode.
The Mode-S Airplane Identification Subfield (AIS)
allows the operator to select the airplane Flight ID to
be downlinked as part of Downlink Format (DF)
message 20 and 21 from the control panel. The Mode
S Flight ID is typically the airplane flight number or
airplane registration number.
STAT: Messages from the transponder are displayed on the
LCD only if the STAT position in the DPL SEL knob is
selected. Transponder messages have he lowest
priority after transponder failure indications. When a
new transponder message is received by the control
panel, the “GO” annunciator illuminates.
2 - ALPHA-NUMERIC CHARACTER LCD
The Mode-S/IFF control panel has an eight alphanumeric character,
liquid crystal display. The display has white characters on a black
background.
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