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1. 10:03 AM - Re: Harvard AT-6C help.... (Jeff)
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| Subject: | Re: Harvard AT-6C help.... |
Nigel,
I=99m reaching out to a few guys in Wetaskiwin to see if they know.
Jeff
Sent from my iPad
> On Jul 23, 2019, at 10:25 AM, Nigel Willson <nigel@easyppl.com> wrote:
>
>
>
>
>
> All,
>
> Am looking for help.
>
> We have a Harvard (AT-6C).
>
> There is what allegedly is called a ballast resistor that sits in an exter
nally accessible electrical box on the left hand side of the fuselage above t
he left wing leading edge. That box also contains the carbon pile rectifier a
mongst other things.
>
> Twice now, this ballast resistor has failed in a thermic way..... (replace
d, and replacement failed after about 10 hours).
>
> When this fails, on activating battery master, there is no power to the ma
in 28v bus..... only power from battery to starter motor. 28v bus only becom
es energised when generator kicks in. Battery does not charge.
>
> Can anyone enlighten what this resistor is for? Rumour has it that it was o
nly to protect old style avionics. If this is the case, would it be safe to r
emove it since we have modern avionics in the aircraft.
>
> Problem us that we are having difficulty sourcing a further replacement, s
o the aircraft is unserviceable until a solution is found.
>
> Is there a modern replacement or mod that anyone knows of?
>
> I'm led to believe its 125 ohm, but have no other information than that (a
nd it's a 28v generator based system)
>
> Help please?
>
>
>
>
>
>
>
>
>
> Regards,
>
> Nigel Willson
>
> Flying Instructor & Examiner | Airshow Organiser | Display Pilot
>
>
>
>
>
>
>
> Mobile:
>
> +44 (0)7809 116676
>
>
>
>
>
> Email:
>
> nigel@easyppl.com
>
>
>
> Web:
>
> http://easyppl.com
> http://greatbritishairshows.com
> http://yakdisplay.com
>
>
>
>
> Sent from my Samsung Galaxy S9 - Powered by Three
>
>
>
>
>
>
> Regards,
>
> Nigel Willson
>
> Flying Instructor & Examiner | Airshow Organiser | Display Pilot
>
>
>
>
>
>
>
> Mobile:
>
> +44 (0)7809 116676
>
>
>
>
>
> Email:
>
> nigel@easyppl.com
>
>
>
> Web:
>
> http://easyppl.com
> http://greatbritishairshows.com
> http://yakdisplay.com
>
>
>
>
> Sent from my Samsung Galaxy S9 - Powered by Three
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