Installation Limitations; System; General Installation; Eis - Garmin GI 275 Installation Manual

2.1 Installation Limitations

2.1.1

System

Only the equipment or aircraft systems with interface(s) approved by this STC can be connected to the
GI 275. Installation of equipment that is not on the STC Equipment List but is interfaced to a GI 275
requires separate airworthiness approval.
Configuration and number of GI 275 displays installed under this STC is limited to a maximum of:
• Six displays total
• Two EIS displays
CAUTION
The total weight of new equipment installed in the instrument panel must not exceed the total
weight of equipment removed from the panel, unless the total weight of all the equipment installed
in the instrument panel is within the weight limits established by the aircraft manufacturer.
2.1.2

General Installation

The GI 275 is designed to replace existing 3⅛-inch gauges. Therefore, minimum modification of the panel
will be necessary.
For GI 275 system components that are mounted outside the pressure vessel of pressurized aircraft, wires
that penetrate the pressure vessel must use aircraft type design provisions such as spare pins in existing
bulkhead connectors or existing cutouts in the aircraft pressure bulkheads. Substantiation for additional
holes or cutouts in the aircraft pressure vessel are beyond the scope of the GI 275 AML STC and require
separate airworthiness approval.
2.1.3

EIS

The existing engine gauges can be replaced by an EIS display only if the functionality, markings, and
operational limits of the original gauges are capable of being replicated on the EIS display. The original
gauge must not be removed if any operating parameter, marking, or annunciation required by aircraft type
design, engine type design, or aircraft POH/AFM (or similar) cannot be replicated on the display or an
appropriate placard cannot be installed.
GI 275 EIS is limited to one EIS display for single-engine aircraft and one EIS display per engine for
twin-engine aircraft. In twin-engine aircraft with two GI 275 EIS displays and a GI 275 MFD, the Fuel
page is the only EIS page approved to be displayed on the MFD. All other EIS pages must be disabled on
the MFD.
EIS is only approved for air-cooled 4- and 6-cylinder reciprocating engine equipped aircraft. Select aircraft
models on the AML have EIS limitations. Refer to notes in Table D-1.
All gauges with red and/or yellow markings, if intended to be replaced by a GI 275 EIS display, must be
identically configured on the Main EIS page. In some cases, one GI 275 will not have enough available
spaces for gauges on the Main EIS page. Any of the following cases will require the retention of the
original gauge(s):
• Three or more of the following gauges have red or yellow marks: Fuel Flow, Fuel Pressure, CDT,
IAT, Carb Temp, and CDT/IAT Diff
• Two of the following gauges have red or yellow marks: Fuel Flow, Fuel Pressure, CDT, IAT, Carb
Temp, and CDT/IAT Diff, and one of the following is true:
190-02246-14
Rev. 11
GI 275 STC EIS & MFD Installation Manual
Page 2-2