ROCKWELL
COMMANDER
112/B/TC/TCA
MAINTENANCE MANUAL
SECTION n
SERVICING
AND
INSPECTION
ing the cleaning operation, paint the
area
after
the
sealing
operation
is
completed.
Mixing
Mix the
two-part
sealants
in
accordance
with the in-
structions
on the
container.
Mix
or
stir
the mixture
until it
is
uniform in
color.
Keep
mixture
free
from
grease,
oil,
dirt,
metal
chips,
and aU foreign objects.
Mix only enough
sealant
necessary
for
completing the
sealing
requirements.
Keep the
sealant
containers
closed
when
sealant
is
not being
used.
Frame
and Rib
Flanges
The edges
of
all
frame
or
rib
flanges
are
sealed
with
a
Hllet of 1422
Class
A
sealant
applied with a
pressure
gun. When
used
as
a faying
surface
sealant,
the
sur-
faces
must be cleaned, the
sealant
applied to one
sur-
face with a
pressure
gun
or
spatula,
and then
spread
with a
spatula
to
cover
the
entire
faying
surface
area
approximately
1/32
inch thick. When
the
surfaces
are
fastened
together,
a
small
excess
of
sealant
will
be
extruded
continuously along the joint.
The
extruded
sealant
is
then
faired
out, leaving a smooth
fillet
along the length
of
the jOint.
Fuel
Tank
Structure
A 1422,
Class
B
sealant
is
used
to
seal
fuel tank
areas
of
structural
joints,
stiffeners,
tank walls, wing
spars
and tank wall fittings.
Force
sealant
into
all
seams
and
joints
with a
pressure
gun.
Eliminate
all
air
poc-
kets
as
sealant
is
applied. Smooth out
fillets
with a
fairing
tool. Use a
forced
smearing
motion, while
eliminating
air
bubbles,
to
press
the
fillets
into place.
Apply a thin
coat
of 1422,
Class
A-2
or
Class
A-1/2
over
fillets.
Fasteners
Fasteners,
rivets,
bolts,
etc.,
installed
through a
faying
surface
seal
within the
work
life of the
sealant
needs no
further
sealing.
Any
fastener
installed
through a
structure
where
no
faying
surface
sealant
has
been
used
shall
be
sealed
as
follows:
a. Apply 1422,
Class
A
or
B
sealant
to
fastener
upon
installation.
Sealant
must
extrude
evenly around
the
fastener.
b.
Brush
fastener
with 1422,
Class
A-2
or
A-1/2
sealant
to
form
a fillet
after
installation.
Windows and Windshield
The windows and
windShield
edges
are
wrapped with
•
number
CR-12-SFR
single faced
rubber
foam. The
windows
are
sealed
around
all
edges with
number
5000
whi
te
sealer
between the
metal
and the
glass,
and the
windshield
edges
are
sealed
with 1221
sealer
between
the
metal
and
the
glass.
The
side
windows
are
held
in
place
by
retainer
strips
and
metal
screws.
The wind-
shield
is
inserted
into the
upper
and
side
channels and
held
in
place by a
lower
retainer.
Screws
pass
through
the
retainer
and into
nutplates.
Should a
leak
occur
in
a window
or
windshield the
glass
should be
removed
Change 1
and the
tape
and
sealer
removed
and
replaced.
See
Windshield and Window Removal and
Installation.
REPAIR
OF
SEALANTS. Should the
sealant
become
damaged during
its
work
life,
it
may be
repaired
by
remOving the damaged
filler
and applying new
sealant,
or
reworking
the
fillet
with a
forming
tool. When the
damaged
filler
has
hardened, the
fillet
should be
re-
paired
as
follows: Remove
all
faulty
sealant
or
re-
move
sealant
down to
solid
materials
and
reseal.
If
beyond
repair,
cut away complete
fillet
and
clean
and
reseal
the
area.
When removing
sealant
do
not
dam-
age
surface
beneath
fillet.
FIBERGLASS
REPAIRS
The engine cowling and
tail
cone
are
of
fiberglass
con-
struction.
Also
some
wing
tips,
stabilizer
tips
and
dorsal
fairings
are
of
fiberglass
construction.
The
following
repair
procedures
cover
fiberglass
Touch-
up and Surface
Repairs
such
as
blisters,
open
seams,
delamination,
cavities,
small
holes
and
minor
dam-
ages
that
have not
harmed
the
fiberglass
cloth
mater-
ial.
Information
is
also
supplied to
cover
fiberglass
Fractures
and
Patch
Repairs
such
as
puncture,
breaks
and
holes
that
have
penetrated
through
the
structure
and damaged the
fiberglass
cloth.
FIBERGLASS TOUCH-UP
AND
SURFACE
REP
AIRS
a. Remove wax,
oil
and
dirt
from
around the
dam-
aged
area
with acetone,
or
MEK (Methyl Ethyl Ketone)
or
equivalent and
remove
paint to
gel
coat.
b.
Scrape
damaged
area
with a fine blade knife
or
roughen
sides
and bottom
of
area
with a power
drill
and
burr
attachment.
Feather
the
surrounding
edge
of
scratch
or
cavity.
Do
not
undercut
the edge.
If
the
scratch
or
cavity
is
shallow and
penetrates
only
the
surface
coat, continue to
step
h.
c.
Pour
enough of
resin
to
fill
the
area
being
worked on, into a
container
or
onto a piece
of
card-
board.
Use
a putty knife
or
stick
and
mix
an equal
amount of
milled
fiberglass
into
the
reSin.
Add
cata-
lyst
to
the
resin
and
mix
thoroughly
according
to
in-
structions.
A hypodermic needle
may
be
used
to
in-
ject
'gel into
small
cavities
not
requiring
fiberglass
millings
mjxed
with
the
gel.
d. Work the
mixture
into the damaged
area.
Use
the
sharp
point of a putty knife
or
stick
to
press
it
into the bottom of the hole and to puncture any
air
bubbles which may be
present.
Fill
the
scratch
or
hole
until
area
has
a buildup of
material
l/l6-inch
above
surface.
e.
Place
a piece
of
cellophane
or
waxed
paper
over
the
repair
to
cut
off
air
and
start
the
cure
of
gel
mixture.
f. Allow the
gel
to
cure
10
to
15
minutes until
it
feels
rubbery
to the touch. Remove cellophane and
trim
flush with the
surface
using a
sharp
razor
blade
or
knife. Replace cellophane and allow
gel
to
cure
30
minutes to an hour. The patch will
shrink
slightly
below the
surface
as
it
cures.
(H
wax
paper
is
used,
ascertain
wax
is
removed
from
the
surface
of
repair.)
g. Rough up the bottom and
edges
of
the hole with
a power
drill
and
burr
attachment
or
rough
sandpaper.
2-15
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**
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