Mooney M20M Service Bulletin

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SUBJECI:
MOONEY
24
VOLT AIRCRAFT ELECTRICAL
WIRING
MODIFICATION,
1
(Revision
A
is
applicable
to M20J and
M20K
aircraft
only
and
is
still
in
effect for
those model
aircraft.
Revision
B
is
applicable
to
M20M
only--).
MODEUS/N
AFFECTED:
MOONEY
MODEL:
M20M
S/N
27-0001
THRU
27-0052
TIME
OF
COMPLIANCE:
AT NDCT
SCHEDULED MAINTENANCE
INTRODUCTION:
THE
24
VOLT
ELECTRICAL
SYSTEM iS WIRED
IN
A
MANNER THAT
RENDERS
THE
OVERVOLTAGE
WARNING
LIGHT
IN THE
ANNUNCIATOR
PANEL
ASSEMBLY
INOPERATIVE
SHOULD
AN
ALTERNATOR
OVERVOLTAGE
OCCUR.
THIS
S.
B.
PROVIDES
INSTRUCTIONS
TO
REWIRE
A
PORTION OF
THE
CIRCUTT
TO
ENABLE
THIS WARNING LIGHT.
INSTRUCTIONS:
1. Disconnect
voltage
regulator
(for
Altemator
#1)
iocated
under
the instrument
panel
on
the
co-pilot’s
side.
2
Locate existino
~Mre
number
M-PA13A18;
push
wire
out
of
pin
8
of
#1
regulator
main
harness
receptacle.
3.
Cut
pin
from
wire,
M-PA13A18;
cap
wire
end
using
AMP
324485
wire
cap
(included
in
kit).
4.
Remove
Glareshield
per
instructions
in
the
appropn’ate
S M
manual,
Section
39-10-01.
5.
Insert
wire
number M-PA13B18
(included
in
-1B
kit)
into
pin
8
of
voltage
regulator
receptacle
and
reconnect
regulator.
6.
Route
wire
number M-PA13B18
along existing
wire bundle
to
annunciator
panel
connector
(M-WT103A).
Secure
with
lacing
cord
or
TyRaps.
7.
Locate
wire
number M-WT02A20 connected
to
pin
1
of annunciator
panel
connector,
M-WT103A,
and
cut
M-V1~02C\20
wire
6
inches back from
connector.
8.
Use
AMP
320559
wire
splice
to
re-connect
wire
number
M-WT02A20 and
tile
unconnected
end of
new
wire
M-PA13B18
(SEE
nGUREM20-245-1B).
9.
For
No.
2 Altemator:
repeat
Steps
1
through
5
with
#2
regulator
but
on
wire numbers
M-PA33A18
(Steps
1,
2
3)
and
M-PA33B18
(Step
5);
Route unconnected end
of
wire number
M-PA33B18
to
vacuum
switch
on
back
of
Artifical Horhon
and
connect to
"white"
terminal.
10.
Remove the
1
amp
Annunciator
C/B
and
replace
with the
2
amp
C/B,
included
in -1B
kit.
1
I.
Functionally
check
operation
of
altemator(s)
per
POH/AFM,
Section
IV,
Normal
Procedures,
Before Takeoff
12.
Enter
compliance
note
in
aircraft
logbook
and
return
aircraft
to
service.
WARRANIY: This
kit should be
ordered
from
the
Mooney
Service Center in
your
area.
Normal
warranty
billing
policies
will
be
in
affect
for
this kit.
MooneyAircraft
Corporation
will
allow
up
to
2.0
hourslabor
to
accomplish
this
modification
if
a
completed
Warranty
Claim
is
received
within
180
days
from the
date of this
SeM’ce
Bulletin.
REFERENCE
DATA:
N/A
PARTS LIST:
KIT
P/N
SB-M20-245-1B
(M20M only)
mM P~
DESCRIPTION
.QK
1.
M-PA~3B18
WIRE
ASSEMBLY
1
2
M-PA33B18
WIRE
ASSEMBLY
1
3. 324485
WIRE
CAP
(AMP)
2
4.
320559
WIRE
SPLICE
(AMP)
1
5.
7277-2-2
C/B,
ANNUNCIATOR
(2 AMP)
1
FI
GURESI
TABLES:
SPUCE
-I
I
FIGURE
M20-24518
(M20M
only)

Mooney M20M Specifications

General

Model	M20M
Horsepower	270 hp
Max Takeoff Weight	3, 368 lbs
Seating Capacity	4
Manufacturer	Mooney
Service Ceiling	25, 000 ft
Height	8 ft 4 in
Fuel Capacity	89 gallons
Type	Single-engine piston
Cruise Speed	210 knots (242 mph, 389 km/h)
Wingspan	36 ft 1 in (11.00 m)