Mooney M20C - Fuel Tank Sealant Inspection; Inspection Preparation and Access; Rib Hole Inspection and Clearance

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MOONEY
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KERRYILLE,
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.":rtnSeuLLETIN
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APPROVED~ ;-i
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SUBJECT:
Inspection
of Fuel Tank Sealant
Application
MODELS/
M20B,
M20C,
M20D,
M20E,
M20F,
M20G
M22 ALL
SERIAL
NUMBERS.
S/N
AFFECTED:
M20J:
thru
24-1498;
M20K:
SM25-0001
thru
25-0854.
h120J:
S/N23-1499
ON
and
M20K:
S~25-0855
ON
ONLY
IF
FUEL
TANK
HAS
BEEN
RESEALED
BY
FIELD PERSONNEL.
TIME OF COMPLIANCE:
Within
next
50
flight
hours
or
at
next
scheduled
inspection.
INTRODUCTION:
Reports
have
been
received that fuel
and
water
have
been
found
trapped
between
ribs due
to
one
d~more
rib
drain
holes
being
sealed
over
during
tank
sealing; particularly
in
tanks
that
have
been
resealed.
INSTRUCTIONS:
General
Inspect
to
ensure
all
required
rib
holes
are
open
to
allow fuel
(or
any
water)
to
move
to
the lowest
area
of the
tank.
Refer
to
Figures
M20-230-1 thru
-7
for
areas
to
check for
specified
holes
to
be
open
and
NOT
filled
with
sealant
compound.
i.
Position
airplanes
in
an
approximate
level
attitude
tall
axis) on
its
landing
gear.
Drain
fuel
per
instructions
in
applicable
Service
and
Maintenance
Manual.
2.
Carefully
remove
fuel
tank
access
covers
on
top
ofwing
as
indicated
below
for
a
particular
model
(reference
Figure
MZO-uO-l).
NOTE
In
lieu of
access
cover
removal
optional
methods of
inspection
are
acceptable.
f
However,
the
method MUST be
demonstrated
to
the local FAA
inspector
that
a
poshi~e
determination
can
be
made
that
all holes
are
open
and
the
intent
of
this
Service
Bulletin has
been
complied
with.
A.
MZOB,
M20C. MZOD.
MZOE
and
MZOG
Models:
Access
Cover
No.O
required.
Fuel Transmitter
O
optional.
B.
AIZOF and
hIZOJ Models:
Access
Cover
NoOrequ~red,
NoO~plional.
C.
MZO~
Xlodel:
Access
Cover
No~nd
O
required.
No.
O
8(
O
optional
D
h122
h~lodel:
Access
Cover
No.O
andO
required,
NaO.
06rOoplional.
3.
Inspect
each
tank
bay
outboard
of
each rib
station
for
trapped
fuel
(or
an~
liquid)
that has
not
drained
through
the
passage
holes
at
each
rib station
to
the
fuel tank
sump
drain
area.
4.
Inspect
each
rib station
(refer
to
Figure
M20-230-2
thro
-7)
to
determine
that
all
fuel
passage
holes
are
open
to
allow
fuel
to
drain
from
outboard of rib
stations
to
the
fuel tank
sump
area.
5.
There
should
be
no
fuel
(or
any
liquid)
trapped
outboard
of
any
rib
station.
If
a
positive
determination cannot
be
made
that
fuel is
not
trapped
and/or that
all holes
are
open,
the
access covers
marked
"Opticlnal"
in
paragraph
2.
A thru
D
above,
should be
removed
to
complete
the
inspection.
6.
Ifinspcction
determines
all
holes
are
OPEN
in
the
appropriate
ribs
as
shown
in
figures
M20-230-2
thru
-7
this
portion
of
inspection
is
completed.
Proceed
to
Step
8.
i
7.
Ifinspcction
dctersines
311
holes
are
NOT
DPEN
in Ihe
apprapriale
ribs
as
shou~n
in
Figure
M20-230-2
thru
-7
proceed
as
follows:
A.
Determine csact
position
of
rib
holc)s)
that
are
sealed
over.
B.
U\ing
pointed
csacto
knife clear
hole
of
sealant;
be
careful
not
to
cut
sealant
from
rib
flangc.