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  #1  
Old 01-22-2019, 12:28 PM
n74846 n74846 is offline
 
Join Date: Sep 2015
Location: Boca Raton, FL BCT
Posts: 113
Default Erratic OAT

My OAT is now giving erratic readings, up and down, and does not settle out during flight. Before I either replace, or start taking things apart (I am not the builder), I am looking for ideas where to start. Are there plug connectors to be cleaned, and if so, where are they? Can a new probe be spliced in or does it require a re-wire? Any help is appreciated. Thanks!
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  #2  
Old 01-22-2019, 07:48 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,764
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It depends on the electronics that are installed. If a D-180, the first place to check is aft of the baggage bulkhead. If I remember right, there is a D-Sub connector that contains the wires from the OAT probe. Take that apart to make sure all of the pins are seated properly and there are no broken wires.
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  #3  
Old 01-22-2019, 08:54 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 757
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You will likely find it very beneficial to your maintenance efforts to acquire a set of digital plans from Van's for your version of the RV-12 -- this assumes that the previous owner did not provide the original construction plan set with the aircraft. The physical locations of the various sensors, wiring, and connections are illustrated in the plans. Van's also offers detailed wiring schematics at:

https://www.vansaircraft.com/public/downloads.htm

As I recall, the OAT probe is a two-wire affair with no particular polarity.
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EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 725+ hours (as of Jan 2019)!
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  #4  
Old 01-22-2019, 11:03 PM
n74846 n74846 is offline
 
Join Date: Sep 2015
Location: Boca Raton, FL BCT
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Sorry I failed to mention I have a classic Skyview. I have the plans on disk, but it was unclear where the wires enter harness/skyview. Thanks for the suggestions.
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  #5  
Old 01-22-2019, 11:40 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Most common cause would be a poor connection or poor ground. Those type of sensors are not known for common failure.

Larry
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  #6  
Old 01-23-2019, 09:08 AM
funflying funflying is offline
 
Join Date: Oct 2006
Location: arvada, co
Posts: 391
Default It has happened to me too.

Steve,
I have a Skyview Classic and had an issue with the OAT. The wires from the probe travel back to the ADHAR (the box were pitot and static connect) and connect with a small plug. Like Joe mentioned in an earlier post, mine had developed a poor connection. Since I corrected this poor connection of these wires/pins into the plug I have had no other problems. Good Luck.
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RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
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  #7  
Old 01-23-2019, 09:57 AM
n74846 n74846 is offline
 
Join Date: Sep 2015
Location: Boca Raton, FL BCT
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Thanks for the input. I'll start with the connection at the ADHAR, as that is the easiest to reach.
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