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Landing Light Wiring

PostPosted:Thu Jan 04, 2018 12:21 am
by x-fighter
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Hi i am intstalling a landing light to help with visabitlity in circuit . Looking at the DRG am i correct with this,

Martin

Re: Landing Light Wiring

PostPosted:Thu Jan 04, 2018 1:53 am
by carlmeek
There are a fair number of different ways of doing it, so hard to say correct or not.

What aircraft is it? What existing wiring is in place? Is there already a fuse/breaker/ECB system in place?

Re: Landing Light Wiring

PostPosted:Thu Jan 04, 2018 1:13 pm
by cockney steve
I'd be happier to see the fuse directly from the "master" (CB?)
reasoning....protects switch and wiring to the light. If other items are on the "master", provided the addition is fused at the correct value, a fault will isolate it, whilst not compromising anything else on the same "master"
I would guess that your" Earth" would need to run back to a central point. using the airframe as a return, could possibly exacerbate electrolytic corrosion. that's not a good idea.

I am not an Avionics Technician, or Electrician, therefore the above is possibly worth what you paid for it. :wink:

Re: Landing Light Wiring

PostPosted:Thu Jan 04, 2018 8:32 pm
by wigglyamp
Fuse definitely between master and landing light switch. Most metal aircraft use the airframe for earth return so a local ground isn't normally a problem. If a composite or wooden aircraft then earth return back to battery or engine frame.

Re: Landing Light Wiring

PostPosted:Fri Jan 05, 2018 11:21 pm
by PaulSS
+1 for putting the fuse after the Master and before the landing light switch.

Re: Landing Light Wiring

PostPosted:Mon Jan 29, 2018 9:54 am
by Joe Dell
I would suggest a large 'Landing light ON' panel light to remind you to switch the bloody thing OFF when on the ground. :)

Re: Landing Light Wiring

PostPosted:Mon Jan 29, 2018 6:57 pm
by Ben Twings
I did something similar, but used a Tyco breaker-switch to simplify.

I ran a copper bus strip from the master-out to the avionics, landing, nav and strobe switch in-terminals.
Used screened single conductor wire to the light and grounded it to the ground-bus behind the panel (only ground one end of the screen).

Re: Landing Light Wiring

PostPosted:Wed Jul 04, 2018 11:55 pm
by cockney steve
^^^^^^^^^I thought the trend, today, was conversion to LED lamps. The power requirements are considerably less than that needed to make a bit of (tungsten?) wire glow white-hot in a vacuum or ionising-gas capsule.
Therefore, the current-consumption and therefore wire-size requirements are likely to reduce.

Re: Landing Light Wiring

PostPosted:Thu Jul 05, 2018 9:02 am
by cotterpot
And it was 6 months ago so I think the wire may be in place by now :wink:

Re: Landing Light Wiring

PostPosted:Thu Jul 05, 2018 11:09 am
by cockney steve
^^^^^^^^^^^ Maybe for the O.P. , but the information is no-less valid for anyone fitting lights in future, -so ner ner na ner ner. :lol: