MOONEY
M20V ACCLAIM ULTRA
SECTION VII
AIRPLANE AND SYSTEM DESCRIPTION
7 - 22
AIRPLANE FLIGHT MANUAL
ORIGINAL ISSUE - 03-16-2017
coupling spring spins the magneto shaft through its neutral position and the breaker opens to
produce a high voltage surge in the secondary coil. The spring action permits the latch plate,
magnet and breaker to be delayed through a lag angle of 30 degrees of drive gear rotation during
the engine cranking period. Two lobes on the breaker cam produce two sparks per revolution of
the drive shaft. After engine is running, counter- weights hold the latch pawls away from the stop
pins and the magneto shaft is driven at full advance.
The engine firing order is 1- 6- 3- 2- 5- 4. Ignition harnesses are connected to the magnetos so
right magneto fires the upper plugs on the right side and lower plugs on the left. The left magneto
fires the upper plugs on the left and lower plugs on the right. The magneto cases, spark plugs,
harnesses and connections are shielded to prevent radio interference.
