CESSNA
MODEL 172S
BEFORE TAKEOFF
WARMUP
SECTION 4
NORMAL PROCEDURES
If the engine
idles (approximatley
600 RPM) and accelerates
smoothly,
the airplane
is ready for takeoff.
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 1800 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,
note RPM and return the switch to the
BOTH position.
RPM drop should not exceed 150 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
alternator
control
unit operation
is essential
(such
as
night
or
instrument
flights), a positive verification
can be made by loading
the electrical system momentarily (3 to 5 seconds).with
the landing
light or by operating the wing flaps .during the engine runup (1800
RPM)'. The ammeter will remain within a needle width. of its initial
reading
if the alternator
and alternator
control unit are operating.
properly.
Revision 4
Содержание Cessna 172S Skyhawk SP
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