Garmin MX20 Installation Manual - 4 Limitations

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Limitations

MX20 Installation Manual

560-1025-09 Rev E

4 Limitations

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.

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.

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.

Only one traffic sensor may be connected to the MX20. Refer to Section 3.1.10 for a list of compatible

sensors.

If the MX20 is interfaced to the Garmin GDL 90, and the aircraft has an operating transponder, the

GDL 90 Code Edit option must be disabled (see Section 2.7.4, Step 10). Only one device installed in the

aircraft can be the entry point for ATC-assigned squawk codes.

Only one FIS sensor may be connected to the MX20. Refer to Section 3.1.10 for a list of compatible

sensors.