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TAXIING.
When
taxiing,
it is important
that
speed
and
use of brakes
be held
to
a minimum
and
that
all controls
be
utilized
(see
Taxiing
Diagram,
figure
2-4)
to
maintain
directional
control
and balance.
The carburetor
heat
control
knob should
be
pushed
full in during
all
ground
operations
unless
heat
is
absolutely
necessary.
When
the
knob
is
pulled
out
to the
heat position,
air entering
the
engine
is not filtered.
Taxiing
over
loose
gravel
or cinders
should
be
done
at
low
engine
speed
to
avoid
abrasion
and stone
damage
to the
propeller
tips.
BEFORE TAKE-OFF.
WARM-UP.
If
the
engine accelerates
smoothly,
the
airplane
is ready
for
take-off.
Since
the
engine
is closely
cowled for
efficient
in-flight
engine
cooling,
precautions
should
be
taken to
avoid
overheating
during
prolonged
engine
operation
on
the
ground.
Also,
long periods
of idling
may
cause
fouled
spark
plugs.
MAGNETO
CHECK.
The magneto
check
should
be
made
at
1700 RPM
as
follows:
Move
ignition
switch first.to
"R" position,
and note RPM.
Next
move
switch
back
to
"BOTH"
to
clear
the
other
set of plugs.
Then
move
switch
to
the
"L" position
and note RPM.
RPM
drop should
not exceed
125
RPM
on either
magneto
or
show greater
than
50
RPM differential
between
magnetos.
If
there
is
a doubt
concerning
operation
of
the
ignition
system,
RPM
checks
at higher
engine
speeds
will usually
confirm
whether
a
deficiency
exists.
An absence
of RPM
drop
may be an indication
of
faulty
grounding
of
one side
of
the
ignition
system
or should
be cause
for suspicion
that the
magneto
timing
is set in advance
of
the
setting specified.
ALTERNATOR
CHECK.
Prior
to
flights
where
verification
of proper
alternator
and voltage
regulator
operation
is essential
(such as
night or instrument
flights),
a
2-7
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