Cessna 172P - Check 4-13 4-T3; Magneto Check; Power Check 4-L3; Warm-Up 4-LS

CqSSNA
MODEL
172P
SECTION
4
NORMAL
PR,OCEDURES
Taxiing
over
loose
gravel
or
cinders should
be
done
at
low engine
speed
to
avoid abrasion
and
stone
damage
to the
propeller tips.
BEFORE
TAKEOFF
WARM-UP
If the engine
accelerate
Since
the engine
is closelY
precautions
should
be taken
operation
on the
ground.
A
spark
plugs.
MAGNETO
CHECK
exceed
125 RPM
on either
m
50
IIPM differen-
tial between
magnetos.
If t
operation
of
the
ignition
system,
RPM check
I 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 ttre electrical
system
momentarily
(3
to 5 seconds)
with the landing light or by
operating
the
wing
flaps
during
the
engine
runup
(1700
RPM). The ammeter
will
remain
within
a
needle
width of
its
initial reading if the
alternator
and
alternator
control unit are operating
properly.
TAKEOFF
POWER
CHECK
It is imporüant to check
full-throttle
engine
operation
early
in
the
30
May
1980
4-t3