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  #1  
Unread 11-25-20, 01:54 PM
GAdams GAdams is offline
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Outside Air Temperature

My 337D OAT gauge consistently reports the temperature lower than it actually is. Can anyone point me towards a previous thread that deals with this subject? Or can anyone tell me where to start to troubleshoot the problem? The Probe or the Gauge?
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  #2  
Unread 11-25-20, 06:41 PM
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Learjetter Learjetter is offline
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Relevant pages from non-current G and H model service manual attached. Perhaps they’ll be of some help in determining what the problem is?

—edit: added OAT mechanical gauge page to attachment
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File Type: png 1E6B7F33-C9D6-429B-8E57-D6AA0E47CEAA.png (373.9 KB, 547 views)

Last edited by Learjetter : 11-29-20 at 12:44 PM. Reason: Added mechanical OAT probe page to attachments
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  #3  
Unread 11-27-20, 10:15 AM
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The D uses just a basic stick thermometer, right? No electronics?
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  #4  
Unread 11-27-20, 05:13 PM
GAdams GAdams is offline
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Yes just a stick. No electronics. Old school.
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  #5  
Unread 11-29-20, 10:35 AM
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I'm not sure that the probe & gauge are separable. There's a bimetallic spring inside. If someone were to remove the cover and overload the spring in one direction, the temperature indicator would probably consistently show several degrees higher in the direction of the overload.
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  #6  
Unread 11-29-20, 12:07 PM
GAdams GAdams is offline
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The documents Learjetter sent me of the maintenance manual appear to be the same system I have. The probe and the gauge are not one in the same. I wish it was.
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  #7  
Unread 11-29-20, 06:03 PM
JAG JAG is offline
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Confused

Anyone else confused?

Learjetter included attachments for two different style OAT:
1) electronic panel mounted (separate Gauge and probe)
2) old style "meat thermometer" one-piece unit that screws through the windscreen.

If you have #2 above, it is indeed one piece unit by design. If it is off by more than 5 degrees, it needs to be replaced with a new one. No adjusting or troubleshooting...it is DOA. New ones available at Aircraft Spruce.

I am not sure how accurate mine is, but I have OAT with my engine monitor and also my Garmin GAD13.

Jeff
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  #8  
Unread 11-29-20, 06:27 PM
GAdams GAdams is offline
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Sorry for the confusion. I have the probe separate from the gauge. The probe is on the left strut brace and of course the gauge is on the panel.
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