Service Instruction No. 1506 A
Replacement of Impulse Coupling Magnetos on Four-Cylinder Engines
June 28, 2016
Lycoming O, IO, AEIO-360 or O, IO, AEIO-320 series engines presently equipped with impulse coupling magnetos.
TIME OF COMPLIANCE
At owner’s discretion
REASON FOR REVISION
Added engine models to “MODELS AFFECTED”; clarified details in the text of this Service Instruction.
This Service Instruction contains instructions to replace impulse coupling magnetos on affected fourcylinder Lycoming engine models with a left retard breaker magneto, a right plain magneto, and an ignition vibrator. This replacement changes the configuration from an impulse coupling to a shower of sparks type configuration.
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