G900X/G950 Installation and Maintenance Manual – GEA 71
Revision D
190-00719-00
Page 5-10
NOTE
The following sections contain general guidance on engine and airframe sensor
installation. This information is provided for reference only. The installer should
always follow any installation guidance and instructions provided by the applicable
engine, sensor, or kitplane manufacturer. Additionally, all installation practices
should be done in accordance with AC 43.13-1B.
5.6.2.1
EGT (Exhaust Gas Temperature) Sensor
Sensor Description:
Type K grounded thermocouple probe with integrated clamp for mounting in exhaust pipe.
General Installation Guidance:
To maintain G900X/G950 Engine Indicating System (EIS) measurement accuracy, thermocouple (TC)
wire must be connected directly to the inputs on the GEA. If the supplied sensor wires are not long
enough to connect directly to the GEA, then Type K TC extension wire must be used. To minimize risk
of breakage, it is recommended that a high-quality stranded (as opposed to solid) thermocouple wire be
used. TT-K-22S Type K thermocouple wire from Omega Engineering is one such example of appropriate
wire.
Alcor P/N 59180 EGT Installation Instructions should be referenced for complete installation details.
Engine manufacturer’s guidance should be consulted and followed for proper location of EGT probes.
1.
EGT probes (Figure 5-1) should optimally be mounted between 2 and 4 inches from the
cylinder head on a flat portion of the exhaust tube. To maintain consistent readings
across cylinders, all probes should be mounted an equal distance from the exhaust
flanges.
2.
Carefully center punch the probe hole locations so that the external portion of the probe
does not interfere with any other parts of the engine or cowling (Figure 5-2). It may be
desirable to angle the probes towards the rear of the engine allow efficient wire routing
back to the cockpit. If angling the probes towards the rear of the engine, take care to
ensure that sufficient clearance is provided to service the spark plugs
3.
Carefully insert probe into the exhaust pipe and tighten clamp snugly with screwdriver.
4.
Connect the EGT probes to the thermocouple extension wire. Provide strain relief for the
assembly by either fastening the probe leads to the valve covers with a clamp, or by tying
the extension wire to the intake tubes or other suitable location. A finger-sized loop
should be provided to allow appropriate strain relief, and care should be taken to ensure
that no chafing of the wires occurs. See Figure 5-3 for an example of an installed EGT
probe.
