SERV ICE BUL LE TIN M20- 255A
IS SUE DATE: No vem ber 17, 1993
SUB JECT:Moo ney M20M, Ret ro fit, cabin ex haust vents on fu se lage sides/cabin ven ti la tion sys tem mod i fica -
tion.
MOD ELS/S/N
AF FECTED:PART 1:M20M - S/N 27- 0002 THRU 27- 0137 (EX CEPT S/N 27- 0094)
PART 2:M20M - S/N 27- 0053 THRU 27- 0167 (EX CEPT S/N 27- 0094)
PART 3:M20M - S/N 27- 0002 THRU 27- 0052
TIME OF
COM PLI ANCE:Within next 25 flight hours or at next sched uled main te nance ac tion.
IN TRO DUC TION:In or der to pro vide a con tin ual purge of the cabin air, com pli ance of this Serv ice Bul le tin
needs to be ac com plished for se rial num bers listed above.
IN STRUC TIONS:
PART 1 : ADD CABIN EX HAUST VENTS (FIG. SB M20- 255-1)
(S/N 27- 0002 thru 27- 0167, ex clud ing S/N 27- 0094)
1.It is rec om mended, but not es sen tial, to re move aft in te rior bag gage com part ment ABS pan els,
both sides. The long ABS pan els, for ward of the bag gage com part ment pan els, will need to be pulled
UP and re strained UP to pro vide ac cess to the in side skin. These long ABS pan els may be re mov ed, if
de sired, to ac com plish the ret ro fit.
Cau tion should be ob served dur ing cut out of hole and drill ing of rivet holes in fu se lage ski n so as
not to drill through any elec tri cal wir ing, ABS pan els or tu bu lar struc ture.
2.Lo cate area of fu se lage skin to be cut out by meas ur ing from the bag gage com part ment/cabin
area, ver ti cal skin lap, for ward, 9.0 inches and down 16.4 inches from lower edge of aft win dow skin
cut- out. The size of each cut- out should be 2.9 inches high and 2.26 inches wide. Keep ver ti cal sides
of cut- out par al lel with ver ti cal skin lap. Rec om mended ra dius on all cor ners of cut- out is .125 inches.
(Fig. SB M20- 255-1)
3.De burr cut- out.
4.Cleco 640296- 001 ABS baf fle to a lou vered plate for L/H side sub- assembly to ver ify that all pi lot
holes in baf fle and lou vered plate are matched. Drill all pi lot holes out to #30 holes. Re peat for R/H
side sub- assembly. Iden tify lou vered plates as R/H and L/H dur ing this pro ce dure.
NOTE: - Be sure that lou vers will have open ings to ward the aft end of the air craft .
5.Af ter drill ing #30 match ing holes in baf fle and lou vered plate, sand wich a 640247- 003, alu m i -
num screen be tween L/H baf fle and L/H lou vered plate; punch match ing holes through screen mesh
with an awl. Re peat for R/H side sub- assembly.
6.Place R/H 640130- 000 lou vered plate in po si tion, over R/H cut- out hole, in ac cor dance with F ig.
SB M20- 255-1. The lo ca tion of the lou vered plate does not have to be ex act, how ever, a mini m um of
.31 inches edge dis tance should be main tained for all fas ten ers.
Drill #30 holes in fu se lage skin to match #30 holes in lou vered plates (13 places for each plate ). Ref -
er ence Fig. SB M20- 255-1. Re peat for L/H cut- out hole..
7.In stall R/H lou vered plate (out side of fu se lage skin), R/H alu mi num screen and 640296- 002 A BS
baf fle (in side of fu se lage skin) with Avex 1691- 0410- 05 riv ets and AN960-6 wash ers. Sand wich alu mi -
nun screen be tween ABS baf fle and in side sur face of fu se lage skin as shown in Fig. SB M20- 255-1 .
Re peat for L/H side.
8.Clean up area and in stall ABS in te rior pan els, if re moved.
9.Paint riv ets, at tach ing lou vered plates, to match ex te rior paint color.
10.En ter com pli ance note in log book and re turn air craft to serv ice.
11.Fill out and re turn pre- addressed, stamped com pli ance card.
PART 2 : RE PLACE BUT TER FLY AS SEM BLY IN CABIN VEN TI LA TION J- BOX (FIG. SB M20- 255-2)
(S/N 27- 0053 THRU 27- 0167, ex clud ing S/N 27- 0094)
1.Lo cate cabin ven ti la tion J- Box in for ward, RH cabin im me di ately be hind fire wall.
2.Ac cess J- Box as sem bly by loos en ing QS100- M40S clamp at J- Box and flex tub ing con nec tion;
re place ex ist ing 640326- 505 but ter fly as sem bly with new 640326- 511 but ter fly as sem bly, Fig. SB
M20- 255-2.
3.Re- install flex tub ing to J- Box with QS100- M40S clamp.
4.En ter com pli ance note in log book and re turn air craft to serv ice.
5.Fill out and re turn pre- addressed, stamped com pli ance card.
— THIS SERV ICE BUL LE TIN IS FAA AP PROVED FOR EN GI NEER ING DE SIGN —
SERV ICE BUL LE TIN M20- 255A
IS SUE DATE: No vem ber 17, 1993
Page 2 of 4
PART 3 : MODI FI CA TION OF SLIDE PLATE ON CABIN VEN TI LA TION J- BOX. (FIG. SB M20- 255-3)
(S/N 27- 0002 THRU 27- 0052)
1.Lo cate cabin ven ti la tion J- Box in for ward, RH cabin im me di ately be hind fire wall.
2.Ac cess J- Box slide plate as sem bly by loos en ing QS100- M40S clamp on J- Box out let air flex tub -
ing con nec tion. Use nee dle nose pli ers to re move MS16562-4 roll pin from slide plate. Re move ca ble
as sem bly/ca ble stops from slide plate. Re move ex ist ing 640010- 000 slide plate from J- Box.
3. Mod ify 640010- 000 slide plate by drill ing two 0.50 inch di ame ter holes, in lo ca tions as shown in
FIG. SB M20- 255-3. Slide Plate must now be re- identified as P/N SB M20- 255- 501; use in deli ble ink to
mark P/N on body of slide plate.
4.Re- install modi fied slide plate into J- Box as sem bly. At tach ca ble as sem bly with ex ist ing ca ble
stops and hard ware.
5.Po si tion slide plate so MS16562-4 roll pin can be in serted into hole through out let air flex tube
open ing.
6.Ver ify slide plate op era tion is smooth and com plete travel can be ob tained in both di rec tions,
prior to in stal la tion of flex tub ing.
7.Re- install flex tub ing to J- Box with QS100- M40S clamp.
8.En ter com pli ance note in log book and re turn air craft to serv ice.
9.Fill out and re turn pre- addressed, stamped com pli ance card.
Ap pli ca ble kits should be or dered from Moo ney Serv ice Cen ters.
WAR RANTY:
Moo ney Air craft Cor po ra tion will al low 4.0 hours la bor to in cor po rate ap pli ca ble por t ions of this Serv ice Bul le tin
on A/C S/N’s 27- 0002 THRU 27- 0137 and 1.0 hours la bor on A/C S/N’s 27- 0138 THRU 27- 0167 if com pli ance card
and war ranty pa per work is re ceived from Serv ice Cen ter by Moo ney Serv ice Parts De part ment within 180 days of
the origi nal date (Sep tem ber 29, 1993) of this Serv ice Bul le tin. Nor mal war ranty pro ce dures on parts and kit com -
po nents will be fol lowed.
REF ER ENCE
DATA:N/A
PARTS LIST:PART 1- Kit Part Num ber - SB M20- 255-1 (S/N 27- 0002 THRU 27- 0137, EX CEPT 27- 0094)
Item.Part Num ber...De scrip tion........Quan tity
1...640130- 000....Plate, Lou vered (Painted)......2
2...640247- 003....Screen, Alu mi num, (16 mesh).....2
3...1691- 0410- 05...Rivet ( AVEX)........26
4...AN960-6....Washer..........26
5...640296- 001....Baf fle, ABS, LH........1
6...640296- 002....Baf fle, ABS, RH........1
7...* Paint.....To match A/C color.......1
8...Com pli ance Card..To be re turned to Serv ice Parts.... 1
* NOTE - Match ing paint will be shipped with kit. Pro vide air craft S/N when or der ing above kit part number.
PART 2 - Kit Part Num ber - SB M20- 255-2 (S/N 27- 0053 THRU 27- 0167, EX CEPT 27- 0094)
1...640326- 511....But ter fly as sem bly.......1
2...MS35206- 226...Screw..........2
3...Com pli ance Card..To be re turned to Serv ice Parts.... 1
FIG URES/
TA BLES:See Fig ures SB M20- 255-1, SB M20- 255-2 and SB M20- 255-3 on fol low ing pages.
SERV ICE BUL LE TIN M20- 255A
IS SUE DATE: No vem ber 17, 1993
Page 3 of 4
FIGURE 1
Serv ice Bul le tin M20- 255A
IS SUE DATE: No vem ber 17, 1993
Page 4 of 4
FIGURE 2
FIGURE 3
.625
.625
.625
0.50 inch di ame ter
holes.
EX IST ING 640010 SLIDE PLATE TO BE RE-
IDENTIFIED TO SB M20- 255- 501 AF TER MODI FIED
WITH TWO 0.50 INCH HOLES PER THIS IL LUS TRA -
TION.
USE IN DELI BLE (PER MA NENT) INK ON BODY OF
SLIDE PLATE.
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