Mooney M20M - Page 205

SERVICE
AND
MAINTENANCE
MANUAL
M20M
MOONP/ AIRCRAFT
CORPORATION
NOTE TAIL
CONE STANPBY
VACUUM
PUMP SYSTEM
Refer
to
Airborne
Service
Letter,
No.
34,
for
OPERATIONAL
PROCEDURES
Inspection
information
on
stand-by
vacuum
If
installed,
the
stand-by
Vacuum
Pump
system
is
pump/clutch assembly
drive
coupling.
located in the tailcone.
Its
location
lis
standard,
but
TAILCONE
MOUNIED
STANPBY
VACUUM
SYSTEM
can vary
slightly depending
upon
optional equipment
installed
on
aircraft.
(If
installed
The
Stand-by
pump
is
to
be used
only
as
needed
The
tailcone mounted
stand-by
vacuum
pump
when the main Vacuum
pump
malfunctions. The
VAC
assembly
is to be
a
repaired/serviced
in accordance
annunciator
light
will illuminate
(RED)
either
Rashing
with the
particular
vendor’s
procedures.
(low
vacuum)
or
steady thigh
vacuum)
when
this
If
no
specific
maintenance
information
is available
situation
occurs.
If
annunciator
light
is
flashing
RED,
from
the manufacturer the
following
is
recommended:
push
STBY
VAC
switch
ON
and
annunciator
light
1.
Inspect
to
verify
hoses
and
wires
are
clear
of
any
Should
extinguish
as
stand-by
vacuum
system
takes
obstruction
or
interference with other
components
OV~’
fO’ all
Instrument
operations.
If
annunciator
is
that
may
chafe
hoses
or
wires.
steady
RED,
monitor
Right
instruments
with
non-vacuum
gauges
and continue
with
flight
if
2.
Inspect
hose
clamps
on
all
fittings
to
verify
tight
feasible,
or
land and have
vacuum
system
inspected
and
secure.
and
repaired.
3.
Every
100
hour/annual
inspection inspect
set
It is
recommended
that
prior
to
aircraft
engine
start,
screws
in
motor/air
pump
coupling
for
tightness
and
the
stand-by
vacuum
pump
be turned ON
to
verify
security.
that the
vacuum
gauge
(if equipped)
indicates normal
4.
A
dry
air
pump
requires
no
maintenance between
operating
vacuum
and
that the
gyms
spin
up
end
replacement.
Replacement
is
recommended
at
500
erect.
When
the
engine
starts,
the
check valve
closes
hours
operating
time.
It
is recommended that
and the
stand-by
vacuum
pump
system
will
not
stand-by
vacuum
system
operating
time be
produce
sufficient
additional
vacuum
for
any
documented.
ndication
on
the
gauge
(if equipped)
to
be
noticeable.
5. It is
recommended
that
if
the
Stand-by
Vacuum
System
is
not
used
regularly,
that
every
90
days
(approximately)
the
Stand-by
Vacuum
System
should
be
turned
on,
in
Right,
for
20 30
minutes
to
get
the
pump
and drive
motor
warm
enough
to
dry
out
any
condensation
that
may
have
accumulated.
The
exhaust
port
of the
dry
air
pump
is routed into the
housing
of
the electric
motor
to
assist
in
purging
moisture
and debris from the
motor
assembly.
37-42-02
499
10
OLDWILLWAYNE