Mooney M20K - Trouble Shooting Chart-Propeller De-ice

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE
AND
MAINTENANCE
MANUAL
3060-01
-PROPEU-ER
DE-ICE
POWER
REQUIREMENTS
FOR
14
VOLT
SYSTEM
TIME
CYCLE
ELEMENT
HEATED
TIME
ON
SEC’s)
LOAD
(AMPS)
D
OUTED
90
8-12
F
INBD
90
8-12
TOTAL
CYCLE
TIME
3
MINUTES
POWER
REQUIREMENTS
FOR
28
VOLT
SYSTEM
ON/OFF
90
8
TOTAL
CYCLE
TIME
3
MINUTES
RECOMMENDED
WIRE
SIZE
CHART
LOCATION
AWG
SIZE
MAX
LENGTH
BUS
BAR
TO
TIMER
#14
15’
TIMER
TO
GROUND
#18
5’
TlMER
TO
BRUSH
MODULE
15’
BRUSH
MODULE
TO
GROUND
SHUNT
LEADS
~20
5’
30-6140
-SERVICE
GUIDE
2.
Use the
"heat
test"
(30-64-00)
and
"load
meter
test"
(30-62-00)
to
determine
which
De-leers
are
not
INTRODUCTION
operating.
Use
win’ng
schematic
to
trace
circuits.
Wnether
in
flight
or
during
ground
testing,
the
BUSS
LOAD
meter
can
be
used
to
determine
the
general
3.
Excess
current
reading
on
the
BUS
LOAD
meter
nature
of
most
electn’cal
problems.
The
Trouble
may
indicate
a
power
lead
shorted
to
ground.
Thus,
Shooting
Chart
is
based,
pn’man’ly,
on
the
use
of
the
when
trouble
of
this
nature
is
found,
it
is
vital
that
the
load
meter
and
it
is
assumed
that
the
user
understands
grounded
power
lead
be
located
and
correded.
all
normal
operating
modes
of
the
system.
(See
4.
A
conside~able
number
of
timers
have
been
returned
Section
IX
of
P.O.H.).
Read
all
of
the
"Trouble"
entn’es
for
repair
which
proved,
on
test,
to
be
fully
operable.
to
locate
the
one
matching
the
conditions
of
the
system
Before
concluding
that
the
timer
is
faulty,
test
it
per
being
checked.
The
"Probable
Cause"
and
"Remedy"
"De-lcer
Timer
Check"
(30-63-00).
entries
pertinent
to
each
trouble are
arranged
in
the
recommended
checking
sequence.
B.F.
Goodn’ch
5.
For
insulation
resistance
tests,
use
a
"megger"
maintenance Manual,
Report
No.
68-04-712B
is
C’Meg"
type
insulation
tester,
James
G.
Biddle
recommended
for
complete
maintenance
actions.
Company,
Plymouth
Meeting,
PA.)
or
other
tester
having
a
500
VDC,
1000
megohm
capacity.
30-61-01
HELPFUL
TIPS
6.
Defective
win’ng
in
propeller
mounted
components
1. The
meter
reading
will
be
slightly
lower
when
the
may
be
indicated
by
normal
current
readings
in
ground
systemis
operated
on
battery
voltage
than
when
the
checkouts
@ropellers
not
rotating)
but
low
current
with
engine
is
running.
propellers
rotating
at
cruise
RPM.
30-6192
-TROUBLE
SHOOTING
CHART-PROPELLER
DE-ICE
TROUBLE
PROBABLE
CAUSE
REMEDY
Ammeter
shows
0
current
No
power
from
aircraft.
If
no
voltage
into
circuit
breaker,
all
phases
of the
timer
cycle.
locate
and
correct
open.
30-60-01
OLDWILLWAYNE