Mooney M20M - Distribution Dry; General; Maintenance Practices

MOONEY
AIRCRAFT
CORPORATION
M20M
SERVICE
AND
MAINTENANCE
MANUAL
37-00-00
-GENERAL
CAUTION
An
engine
driven
dry
air
vacuum
pump
supplies
Always
clean
pump
to
filter
line
and
replace
suction
for
vacuum
operated
gyroscoplc
flight
filter
between
pump
and
firewall
when
instruments,
Directional
Gyro
and
Artificial
Horizon.
Air
replacing
a
failed
pump
to
prevent
particles
is
passed
through
a
filter
before
entering
the
from
failed
pump
Deing
ingested
by
the
new
instruments.
A
vacuum
regulator
valve
is
incorporated
pump.
to
maintain
required operating
vacuum
throughout
37-11-01
MAINTENANCE
PRACTICES
engine
power
range.
Idle
RPM
settings
will
normally
not
provide
adequate
vacuum
to
satisfactorily
operate
Protection
of
pneumatic
dry
air
pump
when
cleaning
instruments,
the
engine
compartment
is
very
important.
A
vacuum
annunciator
light
will illuminate
(RED)
and
WARNING
flash
when
vacuum
drops
below
the
setting
required
to
Failure
to
protect
the
dry
air
pump
from
operate
the instruments.
The
Vacuum
Annunciator
contamination
by engine
cleaning
solvents
Light
will
illuminate
steady
(RED)
when
vacuum
may
result
in failure
of the
dry
air
pump
within
exceeds
normal
regulator
settings.
a
short
period
of
operation.
A
stand-by
vacuum
system
is
standard
for the M20M
Prior
to
washing
down
engine
compartment,
the
aircraft.
This
system
is
installed
on
the
engine
following
precautions
must
betaken
for better
service
accessory
pad
through
an
electrically
activated
clutch
life of the
pneumatic
dry
air
pump.
assembly.
The
stand-by
vacuum
system
should be
activated
manually
when
"HI/LO
VAC"
light
flashes
i.
D’Y
air
pump
coupling.
while
on
primary
engine
driven
system.
This
is
done
CAUTION
by
pushing
STBY VAC
switch,
located
on
instrument
Do
not
blast
the
air
pump
coupling
area
or
panel,
ON.
other
pneumatic
system
components
with
cleaning
solvent
under
high
pressure.
37-10-00
-DISTRIBUTION
Protect
coupling
area
between
the
pump
mounting
37-11-00
DRY AIR
PUMP
flange
and
the
pump
housing
by
wrapping
a
protective
A
dry
air
pump
(1) (Figure
37-1)
requires
no
covering
around
that
area
during engine
cleaning.
maintenance
between
replacement.
Replacement
is
CAUTION
recommended
at
500
hours
at
engine
overhaul.
Do
not
allow
protective
covering
around
the
NOTE
coupling
or
filters
to
become
saturated
with
Always
replace
inoperative
pump
with
new
air
solvent.
pump.
ARTIFICIAL
STAND-BY
VACUUM
HORIZ(IN
PUMP
CHECK SYSTEM
k
ej
VACUUM
REGULATING
VALVE
FILTERS
OYRO
FILTER
STAND-BY
VACUUM
PUMP
OMRBOARD
TUBES
(PRESSURE)
MAIN
VACUUM
PUMP
SMR37-1
VACUUM
SYSTEM
FIGURE
37-1
4-99
37-00-00
OLDWILLWAYNE