Page 5-26 GTX 330/GTX 330D Installation Manual
Revision R 190-00207-02
5.3 Enhanced Surveillance (EHS)
The following table shows equipment connections required to meet Mode S Enhanced Surveillance
(EHS) criteria. Included are a list of parameters to other on-board avionics equipment formats that are
accepted. The Req’d field denotes which formats are needed to make the GTX 330 system Mode S EHS
capable.
It is the responsibility of the installing agency to determine whether the equipment that interfaces with the
Garmin GTX 330 Mode S transponder actually provides the required output. Make sure the interfacing
equipment outputs the correct parameter to the GTX 330 to meet Mode S EHS. See the vendor’s
specification for configuring the external data sources for the data they are capable of providing.
ARINC 429 RS-232
Parameter Label Req’d
AHRS ADC AFCS
GPS/FMS
Nav
EFIS
Display
Shadin
Fuel/Air
Data
GPS
Nav
AFCS
Modes
271 No X
Barometric
Altitude Rate
212 Yes X X X
Barometric
Setting
234
235
No X X
FCU
Selected
Altitude
102
Yes
1
X
X
FMS
Selected
Altitude
102
Yes
1
X
Ground
Speed
312 Yes X X
Ground
Track Angle
313 Yes
X
X
Indicated
Airspeed
206 Yes
2
X X X
Inertial
Vertical
Velocity
365
No
X
Mach
Number
205 Yes
2
X X
Magnetic
Heading
320 Yes X X
Roll Angle
325 Yes X
X
True
Airspeed
210 Yes
3
X X X
True Track
Angle Rate
Yes
3
Note 1: Supplying one selected altitude is sufficient Mode S EHS compliance unless both exist and may
be flown by the autopilot.
Note 2: Supplying either Indicated Airspeed or Mach is sufficient Mode S EHS compliance.
Note 3: Supplying either True Airspeed or True Track Angle Rate is sufficient Mode S EHS compliance.
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