MOONEY SECTION Vll
MODEL M20J AIRPLANE AND SYSTEMS DESCRIPTION
removed when the engine is not running. Turning the magnetolstarter switch
to START and pushing in closes the starter solenoid, engages the starter and
allows the impulse coupling to automatically retard the magneto until the en-
gine is at its retard firing position. The spring action of the impulse is then
released to spin the rotating magnet and produce the spark to fire the engine.
After the engine starts, the impulse coupling flyweights do not engage due to
centrifugal action. The coupling then acts as a straight drive and the mag-
neto fires at the normal firing position of the engine.
The magnetolstarter
switch is spring loaded to return from START to the BOTH position when
released.
NNNNNNNN
"
CAUTION
NNNNNNNN
DO NOT operate the starter in excess of
30
seconds or
re-engage the starter without allowing
it
time
to
cool.
/ll//llllll/lllll//
//WARNING//
l/lll/lllllll///lll
DO NOT turn the propeller when the magnetos are NOT
grounded. Ground the magneto points before removing
switch wires or electrical plugs.
Ail spark plug leads can be
removed as an alternate safety measure.
ENGINE COOLING
The down-draft engine cooling system provides ground and
inflight power
plant cooling. Engine baffling directs air over and around the cylinders and
out the cowl flap openings. Openlng the cowl flaps allows proper air flow on
the ground and during low-speed high-power climbs. Push the cowl flap
switch DOWN to open the cowl flaps.
The cowl flaps can be partially
opened, if necessary to maintain the oil and cylinder head temperature within
the normal operating range.
ENGINE STARTING SYSTEM
Engine starting power is provided by a
24
Volt starter. Ignition is provided by
impulse coupled magnetos. A starter engaged warning light (START POWER
ON) is incorporated as standard equipment in the annunciator panel.
ACCESSORIES
Vacuum Pump
An engine-driven vacuum pump supplies suction for the vacuum-operated
gyroscopic flight instruments. Air entering the vacuum-powered instruments is
filtered; hence, sluggish or erratic operation of vacuum-driven instruments
REV.
B
6-12-87
ISSUED
6-2-86
To Next Page
Loading...
