BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

CERTIFYING AUTHORITY NO. 2 MODEL/ TYPE 3 MODSUM NO. COMPLETE IX] 4 SHEET 

N/A 

DHC-8-400 

15405450003 1 OF 10 

5 CURRENT -A _e, -0 

REVISION 

' 

6 PRIME DESIGN ACTIVITY BOMBARDIER INC. 0 3AB48 7 SUPPLIER NAME AND CAGE CODE 

BOMBARDIER INC .. MONTREAL 0 88308 LEARJET INC. 0 24210 

BOMBARDIER INC., TORONTO IX] 71867 SHORT BROTHERS PLC 0 K4585 

8 TITLE 10 APPROVED INITIATING DOCUMENT 

Trimming of Stiffeners On LHS/RHS Nacelle MLG A-Frame PCR 44059 

Assembly P/N 85414025 

9 MAJOR ASSY OR COMPONENT AFFECTED 

Nacelle MLG A-Frame Assembly P/N 85414025 BASKET MODSUM 

0 SEE INDIVIDUAL AUTH DOCUMENTS 

11 DESCRIPTION OF MODIFICATION 

This IS-Modsum defines trimming of Horizontal and Vertical Stiffeners on MLG A-Frame, in both Left Hand and Right 

Hand Nacelles. 

12 REASON FOR MODIFICATION 

This IS-Modsum is developed to improve clearance with MLG Stabilizer Brace, pin 46400-27 and Subs. 

13 ENGINEERING REMARKS 

/]). <K4 4YIZ.361~ 

~~,_/ I 

APPROVED BY: _Z".V.- ;....-- ~.2:5'9' I DATE £lk-<//I'L APPROVE~CCORDANCE WITH TRANSPORT CANADA DAO NO. 93-0-02 ! 

14 RELATEDMODSUM 4-N<jOI9'?2. _f.P 16 PRODUCTION EFFECTIVITY 

(40113776 Structures, 40126562 Electrical) N/A 

(IS402400028 Electrical, ~Q1 1Q9A:)li001-4~ I) 

(IS402400029 Electricai . .Jie91 I I C[) ~0 -'-l'il j) 

,;.., ".Q-2-"f-1· 15 ENGINEERING VALIDITY 1 # 17 RECOMMENDED SERVICE EFF~TY 

4056 thru 4999 4056 thru ~ 442.G ""£ 

18 CLASS 19 AIRWORTHINESS CLASSIFICATION 

B LEVEL 1·· 0 LEVEL 2·IX] LEVEL 3 0 

BT0206-02A MW REV 2004-10 ""OCCP OR "ACRL & SOC OR FAA FORM 8110-3 REQUIRED © 2004 Bombardier Inc. 
BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 

AUTHORIZATION SHEET 

5 CURRENT REVISION 

21 ORIGINATOR 

22 DESIGN 

-A - g 

C.Taylor c. TA'l'Ldl..-

~ '2DIZ.-o5·DI ~tt..DS-0'( 

1), ~11'2h£ei~AD "D.n-r~.._o 

M~ I~ lot-z. 9-~. M~-( B 111 Zol'L. 

23 DESIGN AUTHORITY C.Taylor 

~ / 'Z.o 1 '--05-01 

5 CURRENT REVISION 

21 ORIGINATOR 

22 DESIGN 

23 DESIGN AUTHORITY 

24 PP&C 

25 REVISION OESCRIPTION 

Rev -A: Transit Sheet 155983 

[2.\0V -13: 12-.UE\LE.NC£ MODSu\-A Ef-f'(.CTIVI'TI E5 

l 'S. '-\ Q. '2.. 4 U:O 2 <S '-1 CD l - LJ 06C/ 

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4 SHEET 

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BT0206-06 MW REV 2004-10 
BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

C MODSUM NO. D SHEET 

AIRWORTHINESS CLASSIFICATION IS405450003 2.1 

H REV V AIRWORTHINESS CLASSIFICATION 

""LEVEL 1 - - -A "LEVEL 2 v (,..~2. 

LEVEL 3 - - W DISCIPLINE CODE ~ '-G 

X 

DES 

CERT 

REP 

AUTH 

SIGNATURE ~ ::f....'lv-.. 

Y CERT AUTH ~~m 1

DES REP NAME J 2111-4vF 

H REV V AIRWORTHINESS CLASSIFICATION 

""LEVEL 1 - - -s "LEVEL 2 - - LEVEL 3 t/ ../' ./ 

W DISCIPLINE CODE ~ LDG r:c 

X CERT AUTH 

DES REP SIGNATURE 9( ~tv. It .I Ill 

Y CERT AUTH 

~*011 -~ 

DES REP NAME ~.ZVL4.,= ~·lld~IIJO 

H REV V AIRWORTHINESS CLASSIFICATION 

""LEVEL 1 - -c "LEVEL 2 - LEVEL 3 ./ 

W DISCIPLINE CODE '5...,---

X 

DES 

CERT 

REP 

AUTH 

SIGNATURE ~) 

Y CERT AUTH C.W4J$lj DES REP NAME 

H REV VAIRWORTHINESS CLASSIFICATION 

··LEVEL 1 

"LEVEL 2 

LEVEL 3 

W DISCIPLINE CODE 

X CERT AUTH 

DES REP SIGNATURE 

Y CERT AUTH 

DES REP NAME 

H REV V AIRWORTHINESS CLASSIFICATION 

··LEVEL 1 

"LEVEL 2 

LEVEL 3 

W DISCIPLINE CODE 

X CERT AUTH 

DES REP SIGNATURE 

Y CERT AUTH 

DES REP NAME 

H REV V AIRWORTHINESS CLASSIFICATION 

··LEVEL 1 

"LEVEL 2 

LEVEL 3 

W DISCIPLINE CODE 

X CERT AUTH 

DES REP SIGNATURE 

Y CERT AUTH 

DES REP NAME 

BT0206-07 MW REV 2004-10 .. AFTER TYPE APP~QVAL. DCCP OR ACRL & SOC OR FAA FORM 8110-3 REQUIRED 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT -A -B 

REVISION 

B 

NJcHANGt@)[C) 

BT0206-05 MW REV 2004-10 

MODIFICATION SUMMARY PACKAGE 

3 MODSUMNO. 4 SHEET 

15405450003 

Q.. 

Location of Modification 

I On LHS and RHS Nacelle 

Rework Location 

A-Frame- Main View 

(Hidden) 

D 

LHS 

Outbd 

Up 

RHS 

__ __,.____ __ Outbd 

c 

Main View 

View Looking Fwd 

On A-Frame Assembly 

P/N 85414025 

..._C ------u/ ,. ---- ' 

3 

A 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

c:lv> 11.0 u-ls 

-A -B -C. 

MODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 

Section A- A shown, 

Section B-B opp 

IS4Q5450003 

-

4 SHEET 

4 

Looking Down On A-Frame Assembly Horizontal Stiffener 

/ 

:,£E. \YETI-II L 

Sl-ltEi S 

BT0206-05 MW REV 2004·1 0 

R. 4 I 1 . 0--.-------7\ 

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. 185 ) 

;---···-- 1.10 

--,.50 

Detail View Showing Trimming Dimensions 

on Horizontal Stiffener 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

-A -B 

BT0206-05 MW REV 2004·10 

MODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 

IS4Q5450003 

Detail View Showing Blending of Corner 

Detail View Showing Final Trim on 

Horizontal Stiffener 

' 

4 SHEET 

5 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

-A -B 

A!2._EA To 

IILilv\M£ L> 

No U-IANf.f: -

BT0206-05 MW REV 2004-10 

3 MODSUMNO. 

Section C- C shown, 

Section D-D opp 

15405450003 

Looking Up/Left On A-Frame Assembly Vertical Stiffener 

6 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

-A -B 

I 

3.1"0 

I 

8T0206-05 MW REV 2004-10 

MODIFICATION SUMMARY fACKAGE 

3 MODSUM NO. 

15405450003 

c.. 

. 090 

Detail View Showing Trimming Dimensions 

on Vertical Stiffener 

R.4/1.0 

4 SHEET 

7 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT -A -B 

REVISION 

{ 

.~~ 

Noo1ANbf@@ 

BT0206-05 MW REV 2004-10 

CMODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 

15405450003 

Detail View Showing Final Trim on 

Vertical Stiffener 

,. 

4 SHEET 

8 

Fwd 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

~ REVISION 

\ 

\ 

\ 

\ , 

\ 

\ 

-A -a 

NDcHANGf@ @ 

BT0206-05 MW REV 2004-10 

MODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 4 SHEET 

IS4Q5450003 l) 

c_ 

-- -

1 rtlltllll'U l\rl'<l 

ISO View Showing Final Trim on A-Frame 
BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

3 MODSUMNO. 4 SHEET 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

-A -i 

15405450003 

-C... 

Engineering Instructions 

This procedure is to be completed in conjunction with 

Installation of Main Landing Gear Brace 46400-27 and Subs 

1. Identify the retrofit areas in LH and RH Nacelles as shown on sheet 3. 

2. Mark trim lines to dimensions shown on sheets 4 and 7. 

3. Remove the material from the A-Frame Stiffeners as shown on sheets 4 through 8. 

4. Break sharp edges and deburr cut metal edges of the A-Frame. 

10 

5. Clearance Check: After completion of metal removal, cycle the gear to ensure there is 

0.1 00" minimum clearance between the MLG Stabilizer Brace, adjacent harness 

assemblies, and newly reworked A-Frame Stiffeners. 

If clearance limit to the Harnesses can not be met, see IS402400028 (AJC 4056-4090) or 

IS4Q2400029 (A/C 4090-4411) for re-dressing the routing. 

Contact Bombardier Aerospace for other reduced clearances between the Brace and 

Structure. 

·I 6. Solvent clean cut metal edges per Aircraft Maintenance Manual, Chapter 51-27-01. 

7. Inspect reworked area and adjacent area using Eddy Current or Flourescent Dye Penetrant 

to ensure that the material does not indicate cracking. 

8. Shot Peen cut areas using a Roto Peen Flap Assembly, to a Roto Peen Intensity of 10 

(equivalent to an Almen "A" Intensity of 8). 

9. Improve cut metal edges to achie~e a surface finish of 125RMS or finer. 

~ 10. Solvent clean cut metal edges per Aircraft Maintenance Manual, Chapter 51-27-01. 

11. Apply Alodine C 1 per Dash 8 Structural Repair Manual PSM 1-84-3, Chapter 51-21-10, to 

bare areas. 

12.Apply Epoxy Primer F19 per Dash 8 Structural Repair Manual PSM 1-84-3, 

Chapter 51-25-10, to Alodined areas. 

13. Apply Polyurethane Enamel F24 per Dash 8 Structural Repair Manual PSM 1-84-3, I I 

Cha pier 51-25-15, to Primed areas. 

14.Apply the markings 15405450003-1 adjacent to the existing serial plates and adjacent to 

the reworked areas on the A-Frame using an indelible permanent marker per Aircraft 

Maintenance Manual, PSM 1-84-2, Chapter 20-00-01. 

15. After the markings have dried, apply a Clear Coat (no colour) of F24 polyurethane enamel 

over the applied 15405450003-1 markings per the Dash-8 Structural Repair Manual, PSM 

1-84-3, Chapter 51-25-15. 

16. Reference: See IS4Q2400028 (AJC 4056-4090} or IS402400029 (AJC 4090-4411) 

affectin_g.Jhe surrounding electrical harnesses within the nacelle cavity. 

IJoalANGE (-ii;) ~C. J 

BT0206-05 MW REV 2004-10