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Rotax 914 UMA Differential Pressure Transducer Failure?

 
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rparigoris



Joined: 24 Nov 2009
Posts: 780

PostPosted: Fri Jan 17, 2020 9:19 am    Post subject: Rotax 914 UMA Differential Pressure Transducer Failure? Reply with quote

Hi Group
Curious, has anyone had a 914 UMA Differential Pressure Transducer Failure?
If so at how many hours? Did you have Transducer exposed to internal cowl temperatures or have it situated in a container under cowl with ambient airflow or perhaps located aft of Firewall?
How was failure noticed?
Thx.
Ron P.


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h&jeuropa



Joined: 07 Nov 2006
Posts: 634

PostPosted: Thu Jan 23, 2020 8:49 am    Post subject: Re: Rotax 914 UMA Differential Pressure Transducer Failure? Reply with quote

Ron,

Never a failure. Installed on the engine side of the firewall.

15 years, 1000 hours service.

Jim & Heather


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erichdtrombley(at)juno.co
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PostPosted: Sun Jan 26, 2020 8:57 am    Post subject: Rotax 914 UMA Differential Pressure Transducer Failure? Reply with quote

Hi Ron,

I have the UMA transducer installed on the of the airbox on my 914 (see picture). No issues in the 10 plus years it’s been installed.

Regards,
Erich

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Remi Guerner



Joined: 14 Dec 2010
Posts: 284

PostPosted: Tue Jan 28, 2020 12:53 am    Post subject: Re: Rotax 914 UMA Differential Pressure Transducer Failure? Reply with quote

Mine failed twice, first time after 30 hours, indicating zero, replaced under warranty, then after 300hours started to give false readings, replaced with a steam gauge.
It was installed on the firewall, see attached picture. Note the engine is a 912ULS, but the UMA sensor is the same as the one for the 914, except that it is vented to the cowling atmosphere instead of the airbox.
Remi


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