Page 28 Vision Microsystems Incorporated
For Indicator replacement, replace your existing CHT probe and adapter,
a bayonet or screw in type with one supplied by VISION
MICROSYSTEMS. Install the probe on the same cylinder from which you
removed the original equipment probe. Your current CHT probe is
installed in the hottest cylinder as determined by the airframe
manufacturer. .
Outside Air Temperature (OAT) Probe Installation
washer
aircraft sheet metal
washer
probe
shield tube
used to secure
probe
Use the J1 connector harness 700200 labeled OAT. All wiring must be
type K thermocouple wire. Do not splice ordinary copper wire in any
temperature probe circuits.
Install the OAT probe, PN 400510 in the airframe manufacturer’s
recommended location. If this information is not available, place the OAT
probe in clean airflow such as in a cabin air scoop or below the underside
of the wing away from engine heat or exhaust. In this case it is
recommended that the installation be done similar to the antenna
installation instructions of AC 43.12-2a Acceptable Methods, Techniques
and Practices.
The outside aluminum shield tube is used to both hold the probe in place
and shield it from radiated heat from the sun. OAT option is displayed as
an independent digital temperature ribbon like "75”.
Induction Air, CDT Probe Installation (Optional)
Use the J1 connector harness 700200 and insert the yellow wire into the
connector pin 3 and the red wire into pin 4. All wiring must be type K
thermocouple wire. The Induction Air Temperature probe, (IAT), is
installed just after the inter-cooler and the Compressor Discharge
Temperature (CDT) just before the inter-cooler. The probe is the same
as an EGT probe and installed similarly to an EGT probe. A large clamp
is supplied to fit around the airport leaving the inter-cooler. Alternately a
1/8 NPT fitting is available. IAT option is displayed as an independent
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