Mooney M20K - Annunciator Trouble Shooting; (SM 25-0001 Thnr 25-0999) Annunciator Trouble Shooting

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE
AND
MAINTENANCE
MANUAL
Grounded
or
open
field
circuit.
Test
and
repair
circuit
if
possible
or
replace
with
new
parts.
Slow
cranking
speed.
Worn,
rough,
or
improperly
Disassemble,
clean,
inspect,
and
lubricated
motor
or
starter.
relubn’cate
components,
replacing
ball
bearing
ifwom.
Same
causes
as
listed
with
Same
remedies.
"Motor
fails
to
operate."
Excessive
motor
brush
Binding,
worn,
or
improperly
Repair
as
outlined
above.
arcing,
seated
brush
or
brushes
have
excessive
side
play.
Dirty,
rough,
pitted,
or
scored
Clean
as
outlined.
commutator.
Excessive
motor
brush
wear
Rough
or
scored
commutator.
Remove
and tum
down
commutator
and
arcing,
on
lathe.
Armature
assembly
not
Reface
commutator.
concentn’c.
24-39-05
ANNUNCIATOR
TROUBLE
SHOOTING
(SIN
25-0001
thru
25-1224)
The
following
Is
a
brief
failure/cause
analysis
which
pertains
to
the
annunciator
(LAI
P/N
500D0061)
on
the
Mooney
M20K.
Each
cause
is
listed
in
probable
order.
All
designator
references
are
made
from
iAl
drawings
710D0125A,
900D0134
and
900D0135.
1
The
"gear-down"
lamp
will
not
light
dun’ng
’ITEST"
but
will
light
with the
gear-down.
CR1
CAssy
A2)
open
2.
The
"gear-down"
lamp
will
not
light
dun’ng
’ITEST"
or
with
the
landing
gear
down.
Filament
of
DSI
(Assy
A2)
open
3.
The
"gear-down"
lamp
is
dim
when
the
position
lights
are
off.
CR24
(Assy
A?)
open
4.
The
"gear-unsafe"
lamp
will
not
light
dun’ng
’’TEST’
but
does
light
when
the
gear
is in
transit.
CR3
(Assy
A2)
open
5. The
"gear-unsafe"
lamp
will
light
during
’rrS‘r’
but
not
when
gear
is in
transit.
CR2
(Assy
A2)
open
6.
The
"gear-unsafe"
lamp
will
not
light
during
’7ESr’
orwhen
the
gear
is
in transit.
Filament
of DS2
(Assy
A2)
open
CR2
(Assy
A2)
and
CR3
(Assy
A2)
open
7.
The
"left
low
fuel"
lamp
will
not
light
during
rEST"
or
in
a
left low
fuel
situation.
Filament
of DS3
(Assy
A2)
open
02
(Assy
Al)
defective
U1
(Assy
Al)
defective
Wire
from
P1-7
(Assy
Al)
to
left
fuel
gauge
open
3.
The
"left
low
fuel"
channel
functions
properly
but
the
lamp
is
always
dim.
CR22
(Assy
A2)
open
9.
The
"left
low
fuel"
lamp
flickers on
and off.
S1
(Assy
Al)
is
in
"Cal"
position
instead
of"Norm"
position
Intermittent
ground
on
the wire
from
P1-7
(Assy
Al)
to
the
left fuel
gauge
C2
CAssy
Al)
defective
in.
The
"left low
fuel"
will
not
light
dun~ng
"TEST’
only
when
the
left
fuel
tank is
full.
RiO
(Assy
Al)
should
be
replaced
with
a
47K,
1/4
watt,
5%
resistor
11.
The
"n’ght
low
fuel"
lamp
will
not
light
during
’ITEST"
or
in
a
n’ght
low
fuel
situation.
Filament
of
DS4
(Assy
A2)
open
06
(Assy
A?)
defective
U1
defective
The
wire
from P1-8
to
the
right
fuel
gauge
is
open
12. The
"right
low
fuel"
channel
functions
properly
but
the
lamp
is
always
dim.
CR23
(Assy
A2)
open
24-39-05
16
OLDWILLWAYNE