Re: Proximity Switches

From:         gsmoff@Mcs.Net (Gary S. Moffitt)
Organization: MCSNet Internet Services
Date:         27 Jun 96 12:56:54 
References:   1
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> I understand that modern aircraft use a magnetic sensor called a proximity
> switch to determine the position of landing gear, doors, etc.  Does anyone
> know why this arrangement is used instead of a simple mechanical switch?
> Are the magnetic pick-offs more reliable than a simple switch?

Yes, the prox switch is more reliable than a mechanical switch.  There are
no moving parts to wear, break or require lubrication.  There are no
electrical contacts to corrode or burn.  Some airlines require prox
switches instead of mechanical switches in sensitive locations.