G900X/G950 Installation and Maintenance Manual – GEA 71
Page 5-1
190-00719-00
Revision D
5 GEA
71
5.1 Equipment
Description
The GEA 71 is a micro-processor based input/output Line Replaceable Unit (LRU) used to monitor
sensor inputs and drive annunciator outputs for aircraft airframe and engine systems. The GEA 71
interfaces with various sensors on the aircraft and communicates airframe and engine information via
RS-485 digital interface to GIA 63W Integrated Avionics Units or IAUs. The GIA 63Ws then interface
with the GDU 1040 Primary Flight Display (PFD) and Multi-Function Display (MFD). Typically, the
MFD shows engine instrumentation while the PFD normally shows airframe alerts provided by the GEA
71. Engine/airframe instrumentation is also displayed on the PFD and/or MFD while the system is in
reversionary mode. The PFD and MFD displays serve as the user interface for the GEA 71. All
configuration settings are controlled via software settings accessed by the MFD and PFD displays.
The GEA 71 uses a configuration module temperature sensor and a thermocouple sensor housed in a
backshell assembly to monitor backshell junction temperatures. This capability is only needed in the
event thermocouple engine temperature sensors are used.
5.1.1 Interface
Summary
The following list is an interface summary for the GEA 71 unit:
•
18 Analog Inputs (All differential inputs; 4 inputs are current monitor capable)
•
12 Engine Temperature Analog Inputs (differential Inputs)
•
23 Discrete Inputs
•
12 Digital Inputs*
•
18 Discrete Annunciate Outputs
•
Two RS-485 channels that interface to GIA 63 IAUs
•
Software & Configuration data input from G900X/G950 system
•
Aircraft Power Input (Power-on controlled by aircraft avionics power bus)
*Note that all digital inputs can also be configured as discrete inputs if desired.
