C. ADS-B Function
The Extended Squitter enabled transponders provide the capabilities of ADS-B
technology, which improves situational awareness and flight safety. The ADS-B OUT
function is an option and may be activated through the MFD software key pertinent to a
specific aircraft registration number.
3.
Operation
SUBTASK AMM-34-50-20-081-D-871-002
A. Standard Transponder System:
The two transponder units located behind the left and right PFDs provide identification
information (Modes A and S) and altitude reporting information (Mode C).
The rack mounted dual Mode S transponder system are a radio transmitter-receivers that
operate on radar frequencies, receiving ground radar and Traffic Collision Avoidance
System interrogations at 1030 MHz and transmitting a coded response of pulses on a
frequency of 1090 MHz. The transponder is equipped with the IDENT capability that
activates the Special Position Identification pulse for 18 seconds. IDENT function is
available through the designated button on the respective side grip.
The GTX 33 replies to Mode A, Mode C, and Mode S interrogations. Mode A replies
consist of framing pulses and any one of 4,096 codes (also known as "squawk codes"),
which differ in the position and number of pulses transmitted. Mode C replies include
framing pulses and encoded altitude.
There are two transponder antennas. The number 1 upper transponder antenna is
mounted on the top of the fuselage and is connect to transponder number 1 behind the
left PFD. The number 2 lower transponder antenna is mounted on the bottom of the
fuselage and is connect to transponder number 2 behind the right PFD.
B. Optional Diversity Transponder System:
As an option, the transponders allow for antenna diversity feature available through the
connection of both antennas to a single transponder unit. this is realized by the RF
antenna switching relay and the diversity configuration control bit to the PFD available for
configuration though the Aircraft Maintenance Computer (AMC). An active transponder
alternates between the upper and lower antennas ensurse the quality and reliability of the
transponder system communications.
C. ADS-B Function
The Extended Squitter enabled transponders provides the capabilities of ADS-B
technology, which improves situational awareness and flight safety. With ADS-B
capabilities, position, velocity, and heading information are automatically transmitted to
other aircraft and ground stations. The current Air Traffic Control system depends on a
transponder request for pertinent aircraft information. ADS-B provides immediate
surveillance of air-to-air traffic and aircraft in remote or inhospitable areas not currently
covered by radar.
EA500 Aircraft Maintenance Manual — 06-117751
Temporary Revision No. 34-21
EFFECTIVITY: ALL POST MB 500-31-016
34-50-20
CONFIG D
Page 2
Sep 30/20
© 2020 Eclipse Aerospace, Inc.
