Mooney M20M - Page 223

MOONEY AIRCRAFT
CORPORATION
M20M
SERVICE AND MAINTENANCE MANUAL
C.
Select
a
tube with
an
outer
diameter
equal
to
F. Install
replacement
tube
over
the inner
sleeve
the
inner
diameter
of
the tube
to
be
repaired
and
with
allowing
a 1/8inch
gap
for
welding
between
the
the
same
wall
thickness,
original
and
replacement
tubes.
D. Cut tube
to
a
lenath
five
times
the
outer
G. Weld the inner sleeve
to
the
tube
stubs
through
diameter
of
the tube
to
be
spj~ced.
the
1/8
inch
gap,
forming
an
overlayed
bead
across
the
E. Install
inner
sleeve
in tube
to
be
repaired
so
Sap´•
that its
outer
end
is
one
and
one-half of
the
original
H. Rosette
weld the
replacement
tube
to
the inner
tube diameter
from the
nearest
end
of the
diagonalcut;
sleeve
in
two
or
more
places.
secure
in
position
with
a
rosette
weld
on
each side
at
3.
SPLIT-SLEEVE
SPLICING. Use
the
split-sleeve
one-half
the
original
tube
diameter
from the
splice
to
repair
a
damaged
tube
when the
parts
on
inner-sleeve end,
each side of the
damage
cannot
be
sep
arated
to
insert
an
inner
sleeve
(see
Figure
51-3).
WELD HERE FIRST
4 ROSETTE WELDS
A
t´•´•´•M
1/2C\
FOR WELDING
300
1/8 IN,
CAP
1-1/2A
i-1/2A
SPLIT-SLEEVE
SPLICE
FIGURE
51-3
A.
Form
the
split
sleeve
from
steel
tube
or
sheet
A.
Cut
A
and
B tubes loose
from
tension
fitting
steel when
outside diameter
of
original
tube
is
less
340034-7,
-8
at
welds.
than
one
inch.
B.
Cut
C tube
at
a
30
degree angle
seven
inches
B. Form
the
split
sleeve
from
sheet
steel
when
f’om bottom
of
tension
fitting.
outside
diameter
of the
original
tube
is
one
inch
or
C. Cut
a
replacement
C
tube
at
a
30
degree angle
more. and
at
an
appropriate
length
to
position
the tension
fitting.
Weld
tension
fitting
in
proper
position.
C.
Form
the
split
sleeve
from
the
same
material
(AISI
4130
steel,
condition
N)
with
at
least
the
same
D.
Drill
four
114
inch
holes
for
rosette
welds
1.9
gauge
as
the
original
tube.
inches
from
center
of
30
degree
cut.
E. Make
an
inner
sleeve five inches
long
from
4130
D.
Allow
a
1/8
inch
gap
between
sleeve halves
for
steel
tube,
condition
N,
with outside diameter
to
match
welding.
inside diameter
of tube
C and with
a
.085
inch
wall
E. Weld
parallel
edges
of
sleeve
to
original
tube
thickness.
through
1/8
inch
gaps.
F. Insert
the inner
sleeve
in
C
tube
and
weld in
place
as
shown
(Figure
51-4).
F. Weld
center
of each sleeve
half
to
original
tube
with
two
rosette
welds
spaced
one
original
tube
5.
REPAIRS
FOR
WELDED
ASSEMBLIES
diameter
apart.
General.
This
section
does
not
apply
to
any
control
system
tubing
or
assemblies,
engine
mounts
or
heat
4.
TENSION FITTING
REPLACEMENT
(see Figure
treated steel
components
(except
as
stated
below).
51-4).
4-99
51-12-01
OLDWILLWAYNE