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CHART 4
OUTBOARD
WING
MA/N SPAR CAP VISUAL
MAGNETIC-PARTICLE INSPECTION
INSRECT/ON
(STEEL BOLTS)
(Figure 4-1E)
The
outboard
wing
main
spar
cap
must
be inspected
TOTAL BOL T LENGTH
annually
for
corrosion.
BOLT
INCLUO/NG HEAD
TO
AMPERE
D/AMETER
NEAREST
1/4
/NCH
TURNS*
5/8 INCH
2 1/2 INCH
7900
WARNING
5/8 INCH
2 3/4 INCH
7100
5/8 INCH
3
INCH
6600
All
areas
of
the wing
main spar
cap,
from
the
3/4 INCH
3
INCH
7900
wing
attach
fittings to the
outboard
end
of the
3/4 INCH
3 1/4 INCH
7400
spar cap, must
be inspected.
3/4 INCH
3
1/2
INCH
6700
3/4 INCH
3 3/4 INCH
6300
7/8
INCH
3
1/2
INCH
7900
BEECHCRAFT
KIT
NO. 58-4002-lS
contains
the parts
7/8 INCH
3 3/4 INCH
7400
and
instructions
necessary
to install
a new
000-110011-3 LH
7/8 INCH
4
INCH
6900
spar and a new
000-110011-4 RH
spar on the
Model
95
7/8 INCH
5
INCH
5500
series wing panels.
The kit does
not contain the spars which
! INCH
5
INCH
6300
must be
ordered
separately.
*Amperage
requirement
is
the ampere
turns value
divided
by the
number
of turns
on the coil.
For
example:
A 1-inch
NOTE
diameter
x
5-inch long bolt
tested
on
a 5-turn coil
would
require
6300
÷
5, or 1260
amps.
Special emphasis
should
be placed
on
airplanes
that
have been
operated
or stored
for extended
periods
(5
years
or
longer) in
geographical
Nuts: Inspection
of a nut is
accomplished
by
circular
locations
where
atmospheric
conditions
are
magnetization
on a central conductor
(usually a copper
rod)
highly
conducive
to corrosion.
the
approximate
size of the
nut
inside diameter. For
proper
magnetization,
the central
conductor
bar is inserted through
the nut and
the bar is
positioned
between the heads of the
Inspection
of the
upper and lower
spar caps
should be
wet
horizontal
equipment.
The magnetic
particle
accomplished
in the following
manner:
suspension
is flowed
on the nut and
the appropriate
current
is
applied
through
the central
conductor
to
achieve
a.
Examine the forward
and
aft sides of the
spar cap
adequate
field strength.
Using the described
procedure,
where
it
meets
the
skin.
If a
whitish,
salt like,
nonmetallic
laboratory testing has indicated
that the
amperage
values
substance is
noted
in these areas, a thorough inspection
listed in Chart 5
provide
for
optimum
detection
of
must
be
performed
to determine if corrosion is
present.
discontinuities parallel
to the
nut axis.
Wax or paint trapped
between the edge of the
skin
and the
exposed
section
of the
spar
cap
should
not
be
misinterpreted
as corrosion.
CHART 5
MAGNETIC-PARTICLE INSPECTION
(STEEL
NUTS)
NOTE
CENTRAL
To gain access to the upper spar cap in
the
NUT
S/ZE
CONDUCTOR
S/ZE
AMPERAGE
-
nacelle area, remove
the shaded
panels shown
in Figure 4-lF.
5/8 INCH
1/2 INCH
500 AMPS
3/4 INCH
5/8 INCH
600
AMPS
7/8 INCH
3/4 INCH
700 AMPS
b.
Wash
all exposed areas of the upper and lower
1 INCH
7/8 INCH
800
AMPS
spar
caps.
c.
Visually inspect all exposed
areas
of
the
upper
After
magnetic
particle inspection,
the
parts
must
be
and lower spar caps for irregularities,
such
as paint blisters,
carefully demagnetized and cleaned of the ferromagnetic
raised or
uneven
areas,
and cracks.
The exposed areas of
particles.
Examine
parts
for
any
possible evidence of
the spar cap are extruded flat and irregularities could be an
electric arc burn that may have occurred
during
the
indication
of
corrosion.
Thoroughly
investigate
all
inspection.
irregularities to
determine
if any damage has occurred.
4·6F
C4
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