BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

CERTIFYING AUTHORITY NO. 2 MODELl TYPE 3 MODSUM NO. COMPLETE IXl 4 SHEET 

N/A DHC-8-400 

15405450002 1 OF 5 

5 CURRENT -A -s 

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 IXl 71867 SHORT BROTHERS PLC 0 K4585 

8 TITLE 10 APPROVED INITIATING DOCUMENT 

Reverse lnst Of Specified Fasteners On LHS/RHS Nacelle PCR 44059 

MLG A-Frame Rework Assembly P/N 8Z8527 

9 MAJOR ASSY OR COMPONENT AFFECTED 

Nacelle MLG A-Frame Rework Assembly P/N 8Z8527 BASKET MODSUM 

D SEE INDIVIDUAL AUTH DOCUMENTS 

11 DESCRIPTION OF MODIFICATION 

This IS-Modsum defines reverse installation of specified fasteners on MLG A-Frame, in both Left Hand and Right 

Hand Nacelles. 

12 REASON FOR MODIFICATION 

This IS-Modsum is developed to prevent chafing of fastener collars with MLG Stabilizer Brace, p/n 46400-27 and 

subs. 

13 ENGINEERING REMARKS 

//~· / 

APPROVED BY: -;:::;> '.'-... / ~- q(Dt:::-0 I DATE Afl( 3C>/i2 

APPROVED ~CbRDANCE WITH TRANSPORT tANADA DAO NO. 93-0-02 

14 RELATED MODSUM 16 PRODUCTION EFFECTIVITY 

(40126562 Electrical) N/A 

(15402400028 Electrical) 

15 ENGINEERING VALIDITY 17 RECOMMENDED SERVICE EFFECTIVITY 

4001 thru 4055 4003 thru 4055 

18 CLASS 19 AIRWORTHINESS CLASSIFICATION 

B' LEVEL 1'' 0 LEVEL 2' ~EVEL 3 0 

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

MODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 4 SHEET 

AUTHORIZATION SHEET 15405450002 2 

5 CURRENT REVISION -A -B 

21 ORIGINATOR C.Taylor C.'\f\'(LcS. 

~ 7 Z..O•t-o'-t·3o ~ / 2oo 2. -<>6-« 

22 DESIGN D. fL1"2.1:>~ill y. f. v. ~-rz~ ~~ -:P. 

AP!z1L 3:,<~ '2o1'J... --5u~'E.(c/~ 2.o~'Z--

23 DESIGN AUTHORITY C.Taylor f:::.\Y-'o'<LD(Z... 

~ Z.otz.-o'-1-SD ~ Zal -z -o"--o & 

24 PP&C 

f-@0> ?D•'l/~1 $-;; Z.0/2- 0&-22 

~ vY<mfiVsxY 

5 CURRENT REVISION 

21 ORIGINATOR 

22 DESIGN 

23 DESIGN AUTHORITY 

24 PP&C 

25 REVISION DESCRIPTION 

Rev -A: Transit Sheet 155982 

REv - B: <:illl\P LENGTI4S G.111£N FOR. \-Il-LITE PINS. 

IR41-1.S \'i SI-IE.E.-r ~0. 15735':3 

BT0206-06 MW REV 2004-10 
BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

C MODSUMNO. D SHEET 

AIRWORTHINESS CLASSIFICATION IS405450002 2.1 

H REV V AIRWORTHINESS CLASSIFICATION 

.. LEVEL 1 

-A 'LEVEL 2 v -- ......-

LEVEL 3 - W DISCIPLINE CODE ~T Lt;:" 

X CERT AUTH 

DES REP SIGNATURE ~ :1..~1....- Y CERT AUTH 

DES REP NAME ~~ .. m~ J,ZUC..II!/F 

H REV V AIRWORTHINESS CLASSIFICATION 

-B .. LEVEL 1 - - 'LEVEL 2 - - LEVEL 3 V' v 

W DISCIPLINE CODE S'T LJ) GX CERT AUTH 

~ f}t .5/..1 DES REP SIGNATURE 

Y CERT AUTH 

DES REP NAME (;.~ ~2VU\()f 

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 

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 APPROVAL.""DCCP OR "ACRL & SOC OR FAA FORM 8110·3 REQUIRED 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

-A -B 

MODIFICATION SUMMARY PACKAGE 

3 MODSUMNO. 4 SHEET 

15405450002 3 

Location of Modification 

On LHS and RHS Nacelle 

Rework Location 

A-Frame Detail A 

(Hidden) Backup Fitting 

PiN 8Z8528 (LH shown) 

P/N 8Z8529 (RH opposite, not shown) 

Up 

Outbd__j 

0 0 • 

Fastener Reversal Locations 

See Engineering Instructions (Sheet 4) 

2 Locations LH Side (Shown) 

2 Locations RH Side Opposite (Not Shown) 

Both LHS and RHS Nacelles 

Note for reference only: 

This fastener location 

does not exist on the 

Right side. 

Backup Fitting P/N 8Z8529 

Detail A Backup Fitting P/N 8Z8528 

View On A-Frame 

Assembly P/N 8Z8527 

BT0206-05 MW REV 2004-10 

Detail A 

View Looking Forward On LHS/RHS Nacelle 

A-Frame Assembly, LH Side Shown 

RH Side Similar and Opposite 

(No Scale) 
BOMBARDIER 

MODIFICATION SUMMARY PACKAGE 

3 MODSUM NO. 4 SHEET 

CONTINUATION SHEET IS4Q5450002 

5 CURRENT 

REVISION 

-A -B 

Engineering Instructions 

This procedure is to be completed in conjunction with 

Installation of Main Landing Gear Brace 46400-27 and Subs 

1. Remove the fasteners identified on Sheet 2 from the LH A-Frame (Qty.2) LH Side and 

(Qty.2) RH Side. Repeat for RH A-Frame. 

2. After removing the fasteners, inspect the area around the fasteners holes for crack 

indications using eddy current (preferred method) or fluorescent dye penetrant. No 

cracking and no elongation indications permitted. 

3. In addition, inspect the holes for any sign of damage. No damage permitted. 

4 

4. Carefully inspect all adjacent fasteners to ensure all collars are secure. No loose 

fasteners permitted. Provided no crack or damage indications are found, proceed with the 

following Hi-Lite installations per the installation procedure in the Dash-8 Structural Repair 

Manual, PSM 1-84-3, Chapter 51-40-15. The following hole sizes are to be used. 

5. Install (Qty.8) Hi-Lite fasteners at the removed fastener locations with the orientation of the 

collars as noted below: 

a. Collars are to be installed on the Forward side of the A-Frame 

b. Install-$- Hi-Lites HST11AG-5-5 (Countersunk Head) with Collars HST1070CY-5. 

c. Install-¢- Hi-Lites HST11 AG-5-4 (Countersunk Head) with Collars HST1 O?OCY-5. 

d. Hole diameter= 0.1590" I 0.1620" 

e. Countersink Diameter= 0.246" I 0.256" 

Countersink is to be On Aft Face Of Fittings PIN 8Z8528 and PIN 8Z8529, on the 

face shown on Detail "A", Sheet 3. 

f. Bombardier equivalent Hi-Lite: B0206002AG5 = HST11 AG-5. 

6. Clearance Check: After final installation of the fasteners, cycle the gear to ensure there is 

0.100" minimum clearance between the MLG Stabilizer Brace, adjacent harness 

assemblies, newly installed Hi-Lite fasteners, and surrounding existing fasteners and 

collars on the A-Frame. 

If clearance limit to the Harnesses can not be met, see IS4Q2400028 for re-dressing the 

routing. 

Contact Bombardier Aerospace for other reduced clearances between the Brace and 

existing Structure. 

7. Finish bare metal (if any) with alodine and epoxy primer in accordance with the instructions 

of the DASH 8 Structural Repair Manual PSM 1-84-3 Chapter 51-21-10 and Chapter 51-25-

10 respectively. 

BT0206-05 MW REV 2004-10 
BOMBARDIER 

CONTINUATION SHEET 

5 CURRENT 

REVISION 

-A -B 

(Engineering Instructions continued ... ) 

MODIFICATION SUMMARY PACKAGE 

3 MODSUMNO. 4 SHEET 

15405450002 5 

8. Touch up the repair area including the newly installed (Qty.8) Hi-Lites and collars with F24 

polyurethane enamel per the Dash-8 Structural Repair Manual, PSM 1-84-3., Chapter 51-

25-15. 

9. Apply the markings IS4Q5450002-1 adjacent to the existing serial plates and adjacent to 

the reversed fastener locations on the A-Frame (Ref. Detail P/N 8Z8527 Sheet 03) using an 

indelible permanent marker per Aircraft Maintenance Manual, PSM 1-84-2, Chapter 20-00-

01. 

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

over the applied IS4Q5450002-1 markings per the Dash-8 Structural Repair Manual, PSM 

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

11. Reference: See IS402400028 affecting the surrounding electrical harnesses within the 

nacelle cavity. 

BT0206-05 MW REV 2004·1 0