Emsis — Manual
6.4
Outside Air Temperature Probe Installation
6.4
Outside Air Temperature Probe Installation
Although the OAT probe is a simple element in the Emsis PFD
system, its installation requires some attention.
Outside air temperature (OAT) probe is shipped with the Emsis PFD
unit. This is a digital temperature sensor inserted into a threaded
aluminium tube. The default OAT cable length is 1.5 meters but
other lengths are available on request.
OAT information is required to calculate true airspeed from indicated
airspeed and altitude, as well as to provide you with the outside
temperature information.
In order to provide accurate measurements, the OAT probe must be
installed on a proper place where the probe is not exposed to the
disturbing sources of heat:
engine heat and exhaust heat,
direct sunlight,
heated air exited from cabin.
We also do not recommend installing the probe in the cabin area,
since the elevated temperature in the cabin may influence the back
side of the probe, though such influence is usually small.
Please follow these steps to install the OAT probe:
1. Locate a spot in the aircraft taking into account the consider-
ations from above and drill a fi 8 mm hole.
2. Remove the external nut from the probe but keep the washer,
internal nut and plastic insulation tube on the probe.
3. Install the probe into the hole from the interior. Guide the
cable through the aircraft to the Emsis PFD back panel.
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Kanardia
2021