magneto drop

mag drop

mag drop
The reduction in RPM when either of the magnetos in a dual-ignition reciprocating engine is switched off. This reduction should be within specified limits. It is standard procedure to check the mag drop case prior to takeoff to confirm that both systems are operative. Also called a magneto drop.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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During the installation and operational check of two new Unison/ Slick magnetos--plus harness and eight spark plugs--to correct a hard starting discrepancy, the engine had a 200-300 RPM magneto drop on the left magneto.
This shouldn't be confused with Champion's earlier spark plug resistor problem, which might cause engine roughness, stubborn starting and excessive magneto drops.