>> My Inspector encourages me to design and build a stall warning myself -
>> after we looked at the spare part prices (> 2.000,-- DM !!!!)
>>
>> I'm considering something like I've seen on Pipers. As far as I can see,
>> a little tongue sticking out under the wing leading edge at the right
>> position and the right angle, operating a micro-switch, would do it.
>> Now, I know I'm a hopeless optimist, but I can not see what's wrong
>with
>> this. On the other hand, the price Piper asks must have a reason. .What
>> am I missing??
I looked at finding a replacement for the Piper switch. It is a Honeywell
microswitch, but its one difference from the switches in the RS catalogues
at 5 to 10 pounds a go is that the switch operates by lifting the operating
arm, rather than depressing it. There is only one manufacturer of switches
that work this way round - and a sales agreement to only sell to
Safeflight. Thus the very high charge in the UK. With the right spring
force, I cannot see why a PFA aircraft cannot fit a switch "upside down" so
that a standard switch operates in the correct sense. It is advisable to
only have a common and a normally open terminal in order to remove the
chance of incorrect connection.
The switches fail due to dirt on the contacts. I have heard of persons
dismantling the switches and cleaning the contacts in order to avoid a high
replacement cost. Not allowed on a Public Cat aircraft of course.
Paul Tucker
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