# BOMBARDIER MODIFICATION SUMMARY PACKAGE CERTIFYING AUTHORITY NO. 2 MODELlTYPE 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 lnstOfSpecified Fasteners On LHS/RHS Nacelle PCR 44059 MLG A-Frame Rework Assembly P/N 8Z8527 9 MAJOR ASSY OR COMPONENTAFFECTED

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



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**~CbRDANCE** WITH TRANSPORT tANADA DAO NO. 93-0-02 14 RELATED MODSUM 16 PRODUCTION EFFECTIVITY

(40126562 Electrical) N/A (15402400028 Electrical) 15 ENGINEERINGVALIDITY 17 RECOMMENDED SERVICE EFFECTIVITY

4001 thru 4055 4003 thru 4055 18 CLASS 19 AIRWORTHINESS CLASSIFICATION



# B' LEVEL 1''

## 0 LEVEL 2'



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## 0
BT0206-02A MW REV 2004-10 ""DCCPOR "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 

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# -B 21 ORIGINATOR C.Taylor C.'\f\'(LcS.



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24 PP&C 25 REVISION DESCRIPTION Rev

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BT0206-06 MW REV 2004-10

# BOMBARDIER MODIFICATION SUMMARY PACKAGE C MODSUMNO. D SHEET AIRWORTHINESS CLASSIFICATION IS405450002 

### 2.1 H REV V AIRWORTHINESS CLASSIFICATION

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DES REP SIGNATURE Y CERT AUTH DES REP NAME H REV VAIRWORTHINESS CLASSIFICATION

..LEVEL 1 'LEVEL 2 LEVEL 3 W DISCIPLINE CODE X CERTAUTH

DES REP SIGNATURE Y CERTAUTH DES REP NAME H REV V AIRWORTHINESS CLASSIFICATION

..LEVEL 1 'LEVEL 2 LEVEL 3 W DISCIPLINE CODE X CERT AUTH

DES REP SIGNATURE Y CERTAUTH DES REP NAME H REV V AIRWORTHINESS CLASSIFICATION

..LEVEL 1 'LEVEL2 LEVEL 3 W DISCIPLINE CODE X CERT AUTH

DES REP SIGNATURE Y CERTAUTH 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 ofModification 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)

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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 Notefor 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 Similarand 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 Sheet2 from the LH A-Frame (Qty.2) LH Side and (Qty.2) RH Side. Repeat for RH A-Frame. 2. After removing the fasteners, inspectthe area around the fasteners holesforcrack indications using eddy current (preferred method)orfluorescent dye penetrant. No cracking and no elongation indications permitted. 3. In addition, inspectthe holesforany sign ofdamage. No damage permitted. 

### 4

4. Carefully inspect all adjacentfasteners to ensure all collars are secure. No loose fasteners permitted. Provided no crack ordamage indicationsare found, proceed with the following Hi-Lite installations perthe installation procedure in the Dash-8 Structural Repair Manual, PSM 1-84-3, Chapter 51-40-15. The following hole sizes are to beused. 5. Install (Qty.8) Hi-Litefasteners at the removed fastener locationswith the orientation ofthe collars as noted below: a. Collars are to be installed on the Forward side ofthe A-Frame b. Install-$- Hi-Lites HST11AG-5-5 (Countersunk Head) with Collars HST1070CY-5. c. Install-¢- Hi-Lites HST11AG-5-4 (Countersunk Head)with Collars HST1O?OCY-5. d. Hole diameter=0.1590" 

### I0.1620" e. Countersink Diameter= 0.246" 

### I0.256" 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 = HST11AG-5. 6. Clearance Check: Afterfinal installation ofthe fasteners, cycle the gearto ensurethere 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. Ifclearance limitto the Harnesses can not be met, see IS4Q2400028 for re-dressing the routing. Contact BombardierAerospace forother reduced clearances between the Brace and existing Structure. 7. Finish bare metal (ifany) with alodine and epoxy primer in accordancewith the instructions ofthe DASH 8 Structural Repair Manual PSM 1-84-3 Chapter51-21-10 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 perthe Dash-8 Structural Repair Manual, PSM 1-84-3., Chapter 51- 25-15. 9. Apply the markings IS4Q5450002-1 adjacentto the existing serial plates and adjacentto the reversed fastener locations on the A-Frame (Ref. Detail P/N 8Z8527 Sheet 03) using an indelible permanent marker perAircraft Maintenance Manual, PSM 1-84-2, Chapter20-00- 01. 10.Afterthe markings have dried, apply a Clear Coat (no colour) of F24 polyurethane enamel overthe applied IS4Q5450002-1 markings perthe Dash-8 Structural Repair Manual, PSM 1-84-3, Chapter 51-25-15. 11.Reference: See IS402400028affecting the surrounding electrical harnesseswithin the nacelle cavity.

BT0206-05 MW REV2004·10