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CHART3
WING BOLT
WRENCHES
AND TOROUE
ADAPTERS
POS/TION
BOLT PART
NO.
WRENCH PART
NUT PART NO
NUT TOROUE
NO.
ADAPTER
LOWER FORWARD
NAS495-14-26/M/
TSl222-3
EBl44
50-590014
UPPER FORWARD
NASl52-37/M/
TS1222-3 (5/8 inch
12NB126
TS1171-2
or
hex)
131790-1
TSl222-4 (9/16 inch
hex)
UPPER AFT
NASl50-35/M/
TS1222-4
12NB108
TS1171-1
or
50-590013
LOWER AFT
NAS152-40/M/
TS1222-3 (for inter-
12NB126
TS1171-2
(Internal
wrenching
bolt)
nal
wrenching
bolt)
or
or
TS I 176-2
MS21250-12-024/M/
TKl817-922-4 (for
(External
wrenching
bolt)
external
wrenching
bolt)
MAGNETIC-PARTICLE INSPECT/ON
obtained
when
the discontinuity
lies in
a
direction
transverse
to the magnetic field, the following
procedures
Magnetic-Particle
Inspection
is
a method
for
locating
are
recommended for optimum detection
of
discontinuities
surface
and subsurface
discontinuities
in ferromagnetic
in both bolts and nuts.
materials
(i.e.
materials
capable of being
magnetized);
consequently,
nonferromagnetic
materials
(such
as
aluminum
alloys,
magnesium alloys, copper
alloys.
lead,
titanium alloys,
nickle
base
alloys and many stainless
steel
WARNING
alloys) cannot be inspected by this
method.
Magnetic-
Particle Inspection is based
upon
the principle
that any
Improper
operation
of the
magnetic
particle
discontinuities lying in
a
direction
generally
transverse
to
inspection
because
of faulty
equipment
or
the
direction
of
the
magnetic
field
of the part magnetized
untrained
personnel
can
jeopardize
the
for
the test wijl cause a
leakage field to be formed
at and
airworthiness
of
the
parts
being inspected.
above the surface
of the part.
The presence
of the
leakage
Minute
electrical
arc burns caused by improper
field denoting
the
discontinuity is detected by
the use of
operation
of the
test equipment
can result
in
finely divided ferromagnetic particles
over the surface
of
eventual failure
of the part.
the
part. Some of the particles are
magnetically
gathered
and
held by
the
leakage field to form
an outline
indicating
the
location,
size, shape and extent
of
the
discontinuity. In
Bolts: Inspection
of a
bolt is accomplished by
longitudinal
general,
magnetic
particle inspection
utilizes
a variety
of
magnetization
in
a multiturn
low-fill factor
coil
(i.e.
the
types of equipment for magnetization as
well as several
inner
diameter
of
the
coil greatly
exceeds
the
bolt
methods
for application of ferromagnetic
particles
to the
diameter). For
proper
magnetization
the bolt is
positioned
test part. Additionally,
the ferromagnetic
particles
are
close
to the
coil
inside
wall
with
the
bolt length
available
in a selection of colors (including fluorescent)
and
perpendicular
to
the
winding
direction.
The
magnetic
particle
shapes. Magnetic particle inspections
required
by
particle
suspension
is flowed
on the bolt
and
the
this manual can best be accomplished utilizing
the
"wet
appropriate
current is
applied
to
achieve
adequate
field
continuous method" on the standard
wet
horizontal
type
strength.
Using the described procedure, laboratory
testing
equipment
with
either
visible
or fluorescent
magnetic
has indicated that the
ampere
turn
values
listed in Chart 4
particles
suspended in a
petroleum
base
vehicle (normally
provide
for
optimum
detection
of discontinuities
kerosene).
Since
magnetic
particle indications
are
best
perpendicular
to the bolt
axis.
C4
4-6E
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