Embraer EMB145, Operation Manual

Page: 2610 / 2662

NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-80
Page
6
Code
01 REVISION 38
A
O
M-145/1
114
NORMAL: The NORM position enables the transponder to
respond to all proper modes (1, 2, 3/A, C, and S),
as well as TCAS TA and TA/RA interrogations, if
selected.
EMERGENCY: The EMER position enables transponder modes 1,
2, 3/A, and S to reply with an emergency code
automatically, irrespective of settings of the
MODE/TCAS rotary knob. Modes 1, 2, and 3/A
automatically respond with a military emergency.
Mode 3/A replies is changed to code 7700.
7 - MODE/TCAS ROTARY KNOB
The MODE/TCAS rotary knob has six positions (OFF, 3A, C, S, TA,
and TA/RA) that enables the different modes of operation and allows
for selection of TCAS functions.
OFF: Disables the Modes 3/A, C and S.
MODE 3/A: When Mode 3/A is enabled, replies to Mode 3/A
interrogations and Mode C framing pulses are
enabled.
Mode 3/A control is provided for pilot or operator
selection of 4096 response codes. Code selection
range is 0000 to 7777, inclusive. When the EMER
mode is enabled, the Mode 3/A military emergency
code 7700 shall be displayed. The Mode 3/A code
remains at 7700 as long as the Master Control knob
is in EMER position.
MODE C: When Mode C is enabled, the system replies to valid
Mode C interrogations. The mode C control disables
or enables the Air Data Source input to the
transponder.
MODE S: This control function enables/disables Mode S
operation. When mode S is enabled, the system
replies to valid ATCRBS/Mode S All-call and mode S
interrogations.