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.