provided on .the lower cowling to allow more free air flow on
the ground and during low speed, high power conditions
(Leo,
climb conditions). Cowl flaps should always be open on the
ground, and prolonged engine operation on
the
ground should be
avoided to prevent engine overhearing.
A
push-pull control is
provided klow the instrument panel and to the right of the
pilot for
operation of the cowl flap.
The engine has
a
pressure-type wee-sump %ubsicaeion
syseern.
It has an eight quart capacity; however, as a general rule, when
the oil
level drops below six quarts, one quart
is
added. This
will maintain the oil level
between the
six
and seven wart
level.
See Pare
IPI
for tgrge of oil used and time kerween
oil
changes.
An
oil temperature thermostat, see for
180
I?*
is
located in
the oil reservoir to assure warm oil for ,311 operations. An oil
cooler
is
mounted on the lower %eft side of the cowling to pre-
vent the
oil from overheating. An oil filter mounted on the fise-
wall is available
as
optional ewipmene.
The Mark
29
ignition system
has
the following features:
1.
Two Bendix magnetos, the left mapeto being eqippd with
a
see
of retard breaker points.
2.
A
starting vibrator, located on the upper firewall, which
furnishes a shower of sparks for starting.
3.
A
switch which combines both ignition and starting functions.
4.
Shielded spark plugs and ignition harness to suppress radio
noises.
When the push-type starter switch
is
activated in the -'startD'
position, the starter vibrator sends an interrupted current
through the retard-breaker points while the right
magndo is
grounded out. The left magneto then provides a shower of sparks
to each cylinder after the piston has reached top dead center on
the compression stroke. The engine starts sooner and easier
because of this system,
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