Mike, any luck chasing the Yak's wiring gremlin?
Hadn't seen any responses, so I'll chime in w/ my hillbilly 2-cents worth.
My Nanchang was fraught with electrical issues years ago, and I wisely
decided to just get down to basics and refurb all the ground connections
(= Scotchbrite all terminals, alcohol clean, reinstall w/ a tiny dab of
sealing
"No-Ox Special-A" terminal paste). That helps a lot.
My initial, "Capt.Obvious" thought is you've got a nasty short lurking...
disconnecting
the battery was the best thing you could have done, as well as staging for
troubleshooting.
Since everything worked so well on previous flight, I'm guessing it's just
in 1 spot, so
visually inspecting wire runs from battery to the cockpit switch box can be
a good first chore.
Doesn't take much at all to create a short in a Nanchang...
Pls keep us posted on progress...
Justin
N280NC, Seattle
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> Total Messages Posted Sun 12/14/25: 1
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> 1. 01:42 AM - Unusual Electric Problem (Stressmerchant)
>
>
> ________________________________ Message 1
> _____________________________________
>
>
> Time: 01:42:13 AM PST US
> Subject: Unusual Electric Problem
> From: "Stressmerchant" <mike_beresford@yahoo.co.uk>
>
>
> I encountered an unusual electric problem with my Yak-52 today. I haven't
> yet been
> able to do any real trouble shooting, will only have time later in the
> week.
>
> The aircraft has recently been for maintenance. Performed well for
> post-maintenance
> test flight, and no issues on the short ferry flight home.
>
> Took a work colleague flying today. No issues on flight, landed, shut dow
n
> normally.
> Once I had pushed the aircraft back in the hangar, I went to put the cano
py
> cover over the aircraft - keeps dust off during the week. I noticed that
a
> light was on in the rear cockpit - the warning light that the master
> switch in
> the front cockpit was on. I looked, master switch was off - as were all
> others.
> I then turned the master switch on and off, to see if that cured the
> problem.
> Not only did it fail to cure the problem, no electrics came on at all whe
n
> the master switch was in the on poisition - except the rear cockpit light
> that
> remained illuminated. No electrics at all - no fuel tank bars, no gear
> lights,
> nothing registering on the voltmeter.
>
> I didn't have time to investiage fully, so I just disconnected the batter
y
> and
> left it at that. But I am puzzled by this. The aircraft had been flying
> fine,
> no issues with anything electric, radios working, etc. But following the
> shutdown,
> nothing appears to work - except a single rear cockpit light telling me
> that
> the master switch is on.
>
> Any ideas on where to start looking? I'm thinking that my first port of
> call wil
> be a voltage check on the battery - although they are fairly new, it coul
d
> be
> that one has died completely.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=516725#516725
>
>
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