Davtron OAT Probe 655

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Part# 10-00653


This probe is for 655, 301, 307, 303, 803
Length: 1.3"
Diameter. .255"
7' Cale
Probe is an active componet when installed. Electrical is 1 Mic. AMP per Degree kelvin.Non Resistave probe. This is not a 500 OHM probe.

California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


all ok

Larry P
January 12, 2021

Works as advertised! My indicator constantly read -199, this probe resolved the issue as the other was bad.

Sherman C
April 4, 2020

Purchased the C307PS probe for a GTX 335. Sadly there was no reference documentation which helped identify if the Red or Black lead was Input or Output needed to connect to the GTX or even the GAD 13. I figured I would share that through trial and error, it was identified that the Black wire from the probe is the Input and the Red wire is the Output. Also, given the recent announcement for the G5 software update which allows displaying outside air temperature (OAT) and true airspeed (TAS), it appears that the GTX 335 does not share this data with other devices or at least it does not appear possible at the moment.

Bob H
October 14, 2019


Please note, Pilotshop's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Pilotshop assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What gauge wire is used on the probe? Also, the GTX335 install calls for the wires to be shielded, with shield terminating at the probe. This does not appear shielded, Will it be OK for the 335?

Per the manual the model that they recommend for installation is C307PS which is our p/n: 11-04603. Per the note it is requesting thermocouple wire equivalent to what C307PS has.

Q: Are these probes used on certified aircraft?

This probe does not have certification on its own. It typically is included in the certification of the instrument you want to use.

Q: Will this Davtron 655 OAT probe work with the Garmin GSU 25?

No, you will need the GTP 59 OAT part # 11-06970 and the connector kit part # 11-11433.