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)