become semi-permanent. Everything else (CGR, EDC, Probes and Modules) can be easily discon-
nected and removed.
1.2 Operational Overview:
The CGR system measures a primary engine or aircraft function using a probe or transducer and dis-
plays that function on the CGR screen using the following steps:
A. A probe is mechanically connected to the aircraft and electrically connected to an EDC input.
The pre-wired harness provides most of the electrical connections from the probes to the EDC
inputs.
B. The EDC converts the signals from the probes to a digital format and sends the data to the CGR
through the serial bus. The EDC has 33 inputs. Many of these inputs can be used to monitor
various types of functions.
C. The CGR receives the data from the EDC and the data is processed through the CGR as follows:
1. The data is assigned to a function.
2. The function is assigned calibration data, units, redlines, limits etc.
3. The function is assigned to a screen location.
4. All data is displayed at the approprate screen location.
Much of the setup for the certified CGR is done at the factory and cannot be changed by the pilot or
installer. See the following Password Protection Section for more information.
1.3 Installation Overview:
The installer may want to use the “CGR-30 Installation Checklist” to install this system. The Checklist is
a separate document provided with the CGR-30 system. The installer should start the installation by
reviewing the CGR and EDC Wiring Work Sheets. There are four work sheets, one for each of the 37-
pin D-Sub connectors on the EDC and one for the CGR. The work sheets are packaged with each of the
three EDC wire harnesses and one for the CGR. The work sheets provide a list of the functions and
probes/transducers included with this kit. For a twin engine installation refer to appendix A4.0. The
installation is achieved by performing the following steps:
A. The CGR display is installed. The CGR is mounted from behind the instrument panel in a stan-
dard
3 1/8" hole.
B. Probes and Transducers are installed.
C. Control Panels, Pots and Warning Lights are installed.
D. The EDC is installed. The EDC should be installed on the inside of the cockpit or in an instrument
bay with the connectors pointing down. For a twin-engine aircraft it can be installed on the
backside (not the engine side) of the firewall with the connectors pointing down.
E. The Wire Harnesses are installed. The wire harnesses for the EDC and CGR are pre-wired and
included in the kit.
F. Field Calibration/Setup steps are performed. If Fuel Tanks are to be monitored, they must be
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