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Circuit breaker size for pitot heat?

 
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jbsoar(at)gmail.com
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PostPosted: Sun Jul 08, 2018 11:54 pm    Post subject: Circuit breaker size for pitot heat? Reply with quote

Fellow listers:  What size circuit breaker is used for pitot heat in our Yak aircraft?Thank you!

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LawnDart



Joined: 05 Jun 2006
Posts: 62

PostPosted: Mon Jul 09, 2018 6:34 am    Post subject: Re: Circuit breaker size for pitot heat? Reply with quote

10 amp (АЗРГК-10)

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dougsappllc(at)gmail.com
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PostPosted: Mon Jul 09, 2018 8:19 am    Post subject: Circuit breaker size for pitot heat? Reply with quote

CJ6 Tech Spec Manual calls out a ZKC-5 amp breaker switch (page 160, fig 7.5)Have them in stock if needed.
Doug
On Mon, Jul 9, 2018 at 12:42 AM, John B <jbsoar(at)gmail.com (jbsoar(at)gmail.com)> wrote:
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Fellow listers:  What size circuit breaker is used for pitot heat in our Yak aircraft?Thank you!



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Rob Rowe



Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK

PostPosted: Tue Jul 10, 2018 6:30 am    Post subject: Re: Circuit breaker size for pitot heat? Reply with quote

FYI - be aware that the pitot heater has a simple transistor circuit that only drives the green 'on' lamps (see attached diagram) when the heater is consuming power i.e. it monitors that the heater is actually working, not just being supplied with a voltage.

So if the heater, resistor or associated wiring goes open circuit, or the transistor fails, the lamps will not light ... that could lead you to consider that the 10A breaker has died.

The resistor (T4) & transistor (T5) can be found in the relay box on bulkhead 6 (at the back of rear instrument panel) if you want to check out the circuit.

Hope this helps with your fault finding.

Rob R


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