SECTiON
4
NORMAL
PROCEDURES
(~~L402C
AMPLIFIED
NORMAL PROCEDURES
PREFLI~~;~
INSPECTION
The
Preflight
Inspection, described in Figure 4-1,
is
recommended
for
the
first
flight
of
the day. Inspection procedures
for
subsequent
flights
are normally limited to
brief
checks of the
tail
surface hinges, fuel
and
oil
quantity
and
security
of fuel
and
oil
filler
caps.
If
the airplane
has
been
in extended storage,
has
had
recent major maintenance or
has
been
operated
from
marginal
airports,
a
more
extensive
exterior
inspection
is
recolllTlended.
After major maintenance
has
been
performed, the
flight
and
trim tab
controls should
be
double-checked
for
free
and
correct
movement
and
secu-
rity.
The
security
of
all
inspection plates
on
the airplane should
be
checked
following periodic inspections. Since avionics
and
heater mainte-
nance requires the
mechanic
to
work
in the
nose
compartment, the
nose
compartment
doors are
opened
for
access to equipment. Therefore,
it
is
important
after
such
maintenance to double-check the security of these
doors.
If
the airplane
has
been
waxed
or polished,
check
the external
static
pressure source holes for stoppage.
If
the airplane has
been
exposed
to
much
ground
handling in a
crowded
hangar,
it
should
be
checked
for
dents
and
scratches
on
wings, fuselage
and
tail
surfaces, as well as
damage
to navigation,
anti-collision
and
landing
lights,
deice boots
and
avionics antennas. Outside storage for
long
periods
may
result
in water
and
obstructions in airspeed system
lines,
condensation in fuel tanks,
and
dust
and
dirt
on
the intake
air
filters
and
engine cooling
fins.
Outside storage in
windy
or
gusty
areas,
or
adjacent
to
taxiing
airplanes,
calls
for special
attention
to control surface
stops,
hinges
and
brackets to detect presence
of
wind
damage.
If
the airplane
has
been
operated
from
muddy
fields
or in
snow
or
slush,
check the
main
gear
and
nose
gear
wheel
wells for obstructions
and
cleanli-
ness. Operation
from
a gravel or cinder
field
will require extra
attention
to
propeller
tips
and
abrasion
on
leading edges of the horizontal
tail.
Stone
damage
to the propeller
can
seriously reduce the fatigue
life
of the
blades.
Airplanes
that
are operated
from
rough
fields,
especially
at
high
alti-
tudes. are subjected to
abnormal
landing gear abuse.
Check
frequently
all
components
of
the landing gear
retracting
mechanisms,
shock
struts,
tires
and
brakes.
Undue
landing
and
taxi loads will
be
sUbjected
on
the airplane
structure
when
the shock
struts
are
insufficiently
extended. A completely
collapsed (zero extension) shock
strut
could cause a malfunction in the
landing gear
retraction
system.
To
prevent loss
of
fuel in
fli9ht,
make
sure the
main
fuel tank
filler
caps are
tightly
sealed.
The
fuel tank vents
on
the lower surface
of
the
wings
should also
be
inspected for obstructions, ice or water, especially
after
operation in cold,
wet
weather.
1
November
1979
4-9
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