Mooney M20M - Page 140

SERVICE
AND
MAINTENANCE
MANUAL
M20M
MOONEY AIRCRAFT
CORPORATION
30-60-00
PROPELLER DESCRIPTION
OPERATION
Propeller
ice
removal
is
accomplished
by
either of
two
The
ON/OFF
switch
is
located
on
switch
panel
in
front
methods.
If the
Airfoil
Ice
Protection
System
is
installed of
pilots
right
knee. The
BLUE
light,"
PROP
DE
ICE",
for
Right
into known
icing,
the
ethelyne-glycol
system
is
on
annunciator
panel
will illuminate
at
each
cycle
installed. Another
configuration
is
optional,
electrically
(evety
90
seconds)
the
boots
are
drawing
current.
The
heated de-ice boots
bonded
to
each
propeller
blade.
ammeter
may
show
a
slight
flicker each
90
second
This
system
uses
airplane’s
electrical
power
to
heat interval
as
timer
tums
de-ice
boots
ON/OFF/ON.
This
de-ice
boots,
in
cycles
controlled
by
a
timer.
is normal
operation.
The
timer
is located
on
the
equipment
rack
in
tailcone.
De-icer
boot
replacement
should
be
done
per
de-ice kit
manufacturer’s
service information.
McCauley
Manual
No.
830415,
Spec.
No.
Me
2611-B
McCaulley
Dwg.
No.
D-40496.
or
TKS
System
from
Aerospace Systems
Technology,
Inc.
30-60-01
PROPELLER DE-ICE
POWER
REQUIREMENTS
FOR
28
VOLT
SYSTEM
TERMINAL
C
ON
OFF
90
SECONDS
8
AMPS
TOTAL
CYCLE
TIME
3
MINUTES
RECOMMENDED
WIRE SIZE CHART
LOCATION
AWG SIZE
MAX LENGTH
BUSBAR
TO
TIMER #14
15’
TIMER TO GROUND
#18
5’
TIMER
TO BRUSH MODULE
#14
15’
BRUSH MODULE TOGROUND
SHUNT LEADS #20 5’
30-61-00
SERVICE GUIDE
2.
Use
"heat
test"
(30-64-00)
and "load
meter
test"
(30-62-00)
to
determine
which De-leers
are
not
INTRODUCTION
operating.
Use
wiring
schematic
to trace
circuits.
Whether
in
flight
or
during
ground testing,
the
ammeter
can
be used
to
determine the
general
nature
of
most
3.
Excess
current
reading
on
the
ammeter
may
electrical
problems.
A Trouble
Shooting
Chart
is
indicate
a
power
lead
shorted
to
ground.
Thus,
when
provided
later
in
this Section
and it is
assumed
that the
trouble of this
nature
is
found,
it is
vital that the
user
understands normal
operating
modes
of
system.
S’ou"ded
power
lead be
located and corrected.
(See
Section
IX of
P.O.H.).
Read all
7rouble"
entries
4.
A
considerable number
of
timers have been
to
locate
matching
conditions of
system
being
checked. retumed for
repair
which
proved,
on
test,
to
be
fully
The
"Probable Cause"
and
"Remedy"
entries
pertinent operable.
Before
concluding
that the
timer
is
faulty,
test
to
each trouble
are
arranged
in
recommended check
itper
"De-lcer
Timer
Check"
(30-63-00).
out
sequence.
McCauley
Manual,
No.
830415
is
5.
For
insulation resistance
tests,
use
a
"megger"
recommended
for
maintenance
actions.
("Meg"
type
insulation
tester,
James
G.
Biddle
See
Trouble
schematics
on
following
page.
Company,
Plymouth
Meeting,
PA.)
or
other
tester
having
a
500
VDC,
1000
megohm
capacity.
6.
Defective
wiring
in
propeller
mounted
components
3061-01
HELPFUL
TIPS
may
be indicated
by
normal
current
readings
in
ground
checkouts
(propellers
not
rotating)
but low
current
with
1.
The
Voltmeter
reading
will
be
slightly
lower when
system
is
operated
on
battery
voltage
than
when
propellers
rotating
at
cruise
RPM.
engine
is
running.
4-99
30-60-01
15
OLDWILLWAYNE