Garmin MX20 Installation Manual - 4 Limitations
Limitations
MX20 Installation Manual
55
4 Limitations
4.1 Operation
There are no Part 23 aircraft type limitations. All functions of the MX20 meet the appropriate design assurance
qualifications for a secondary system for airplanes in Class I, Class II, Class III, and Class IV in accordance
with AC 23.1309-1C, Figure 2. The TSO authorizations with the RTCA/DO178B software levels by function
are listed in Section 1.3.
4.2 Installation
The conditions and tests required for TSO approval of this article are minimum performance standards. It is the
responsibility of those installing this article either on or within a specific type or class of aircraft to determine
that the aircraft installation conditions are within the TSO standards. TSO articles must have separate approval
for installation in an aircraft. The article may be installed only if performed under 14 CFR Part 43 or the
applicable airworthiness requirements.
If it is necessary to move any required instrumentation in an instrument panel to make room for the MX20,
although the physical mounting of the MX20 is covered within this installation manual, the relocation of these
instruments is beyond the scope of the STC.
For installations where a stack is not already installed in the aircraft or the alternate mounting configuration
depicted in Figure 2-4 is implemented, a separate structural approval is needed for installation of the stack.
Any other alternate mounting configuration is beyond the scope of this STC.
For preservation of essential equipment in aircraft with multiple power busses the MX20 should be powered
from the non-essential bus.
4.3 GPS Antenna
The MX20 with internal GPS receiver (430-0270-0( )) is compatible only with the Garmin AT A-33 (590-
1104) or A-34 (590-1112) antennas, or those with equivalent specifications. Refer to section 3.3 for
specifications.
4.4 Antenna Installation – General
Antenna installation in the pressure vessel of pressurized aircraft is beyond the scope of the MX20 STC.
Additional manufacturer's data may be necessary and FAA approval may be required to cover the installation of
any antenna in the pressure vessel of a pressurized aircraft.
4.5 Traffic Sensor
Only one traffic sensor may be connected to the MX20. Refer to Section 3.1.10 for a list of compatible sensors.
4.6 FIS Sensor
Only one FIS sensor may be connected to the MX20. Refer to Section 3.1.10 for a list of compatible sensors.