l'lR'y 21~1 '99 2121:1213 FR B[I,'1BRRDIER RCTIC~l CTR416 375 4522 TO T'I'RDLERl'l H I.Jlt'-JTE P,,04/07

PREPARJ;:D:IB

SECl 1PAGE lISSUE 1

RD8-53~4218~BOMBARDSEft

~

BOMBARDIERAEROSPACE

CHECKED

DATE: May 1999

The following pages detail an Acceptable dent in Skin Panel. 85310045, forward ofX94 0 and between Stringers 21P and 22P .. Subject to limitations on following pagesdent is acceptable for continued operation as is.

This repair is void if there is any damage to underlying structure.

This repair will require a special inspection as defined on Page 2. Thisinspection must be incorporated into the operators approved maintenanceprogram.

This Repair is detailed in: RD8-53-4218 Section I Pages 1 Iss ..12 Iss. 13 iss 14 Iss. 1

RD ISSUE 1 Ti,tle:DATE

.._. ...-Acceptable Dent in Skin Panel,20fl\llay/99

,,-

DRAW!'O Ianpurns 85310045, Forward ofX94.0 andAPPROVED 1AV~91/'--.. Between Stringers 2IP and 22P.

._-STRESS M~

REPORT NUMBER APPLICABILITY

D. 'l~It .~ DHC-8-300!~ ~~ ~

A. 1 ~~ <,

~RD8-53-4218

i-: ~ ~~.J:~ Q'" q SIN 527.:J

R. ~~~~.....tl

I~-

l'IAY 20 ''39 20: 03 FR BOl1BAFWI ER ACTl 01'1CTR416 375 4522 TO TYROLEAHH WIHTE P, 05/07

.---, .-------~ T_----------------,PREPARE.o: I B

CHECKED SECT 1PAGE :2'ISSUE I

RD8-53-4218~BOMBARDIER

"WBOMBARDIERAEROSPACE

DATE: May '99

INSPECTION REQUIREME~TS

This repair affects the airworthiness limitations document and requires anadditional task. The inspection requirements for this task, which are shownbelow, are Transport Canada approved. The operator must incorporate thisadditional task as an amendment in the airworthiness limitations document forthe affected aircraft serial number. It is the operator's responsibility to obtainapproval of the amended airworthiness limitations document from hisregulatory authority and to incorporate the added inspection task in themaintenance program for the affected aircraft. The time for thresholdinspection is measured from the time of the incorporation of this repair.

Threshold: 16000 Fligh ts

Repeat: 1826 Flights

The above inspection times were determined in Report AEROC 8.4.AC.12,Section 53-0004-1~ using the Transport Canada accepted damage toleranceevaluation procedure documented in AEROC 8.4.AC.5~Section 19.1.

Inspection Method: Detailed Visual Inspection.

Inspection procedures: Perform detailed external visualinspection of dent and immediate vicinity (refer to DASH 8Maintenance Program Manual, PSM 1-83-7, Appendix 1Glossary).

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PREPARED: I BRD8-53-4218

BOMBARDIER ~CHECKED BOI'llSARIlIJiH SECI' I

AEROSPACE ~ PAGE 4

DAlE: May '99 ISSUE 1c

GENERAL NOlES

/1) This repair is void if there is any damage to underlying structure.

Before installation of the repair, ultrasonic inspection of the bonded skin and waffle doubleris required to ensure that no disbonding is present in the repair area If disbonding isfound contact. Bombardier Aerospace Regional Aircraft before proceeding further.Ultrasonic testing is the preferred method of inspection for skin/waffle doubler

~ co, 1. I~"1Adisbonding If the preferred method is impractical, or if ultrasonic test facilities are notavailable, an alternative non destructive inspection procedure may be used provided it isapproved by an appropriate airworthiness authority and is performed by an operatorwithdemonstrated expertise

/ 3) Dent shown on previous page is allowed in skin only and can not affect ~ underlyingV structure such as stringers, flames and intercostals Dent must meet criteria outlined

below.Dent to be smooth with no sharp corners, nicks, gouges or-abrasionsAspect ratio as defined below must be equal to 01 greater than 10.

Aspect ratio =Minimum diameter I DepthNote: Ifthe deepest point is not in the centre of the dent, Aspect ratio shall be defined as2Y I Depth, where Y isthe minimum distance from the deepest point to the edge of dent

4) Crack detect using preferred Eddy Current method, per PSM 1-83-7A, Section 51-·00-06,01 fluorescent dye penetrant method No cracks permitted

5) Any bare metal to be finished with Alodine and Epoxy Primer.i) Alodine per Structural Repair Manual, PSM 1-83 J, Chapter 51-20-26ii) Epoxy Prime pet' Structural Repair Manual, PSM 1··83-3,Chapter 51- 20-36

6) On completion of repair apply thin coat of Can osion Inhibiting Compound - LPS-3,Dinitrol AV5B-2 or equivalent - per Maintenance Manual, PSM 1-83-2, Chapter20-16-01, over internal surfaces of the repair.

** TOTAL PAGE,07 **

PAGE 1 OF 1

ac INSPECTORSURVEILlANCE

DATE

, .

r MAY 20 '99 20:03 FR BOM8~RDIER ~CTION CTR416 375 4522 TO TYROLEAN H WINTE P.04/07

PREPAREO:IB

SECT 1PAGE IISSUE I

RD8-53~4218~DOMBARDIUI

~

BOMBARDIERAEROSPACE

CHECKED

DAn:: May 1999

The following pages detail an Acceptable dent in Skin Panel, 85310045, forward ofX94.0 and between Stringers 21P and 22P. Subject to limitations On following pagesdent is acceptable fOI continued operation as is.

This repair is void if there is any damage to underlying structure.

This repair will require a special inspection as defined on Page 2. Thisinspection must be incorporated into tbe operators approved maintenanceprogram.

This Repair is detailed in: RD8-53-4218 Section I Pages 1 Iss. [2 Iss. 13 Iss.I4 Iss.I

RD ISSUE 1 Title:.._-

Acceptable Dent in Skin Pane),DATE 20/May/99DR<\WN Ian ,Burns. 85310045,Forward of X94.0 andAPPROVED IAV~~ Between Stringers 21P and 22P.--STRESS M~

REPORT NUMBER APPLICABILITY

D. 'I! l't ~DHC-8-300N~~ .:t

A. i~~~ ~

RD8-53-4218h~·X~o ~ q SIN 527..:1-

~~"-R. ~~ ~

I~~

MAY 20 '99 20: 03 FR BOi'lBRRDI ER ACT ION CTR41S 375 4522 TO TYROLEAN H WINTE P. 136/07

PREPARED 1.~0('l.!JSCI-!ECKEO

DATE MA"i \~~

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Issuedby ////fc/ ..~ Dat:c;-;,?7~ qq Station Ii-'i!/ Fit/Leg Operator10 MELRef Cat. Priority

R~ason: TroubleShooting --=-- PreventiveMai~ Wornto limit Time~xpired -=-SB/Mod Cleaning Insp~ti~ _Benchtest ~ Re-certification '_ Overh~1 :' Repair ~

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ADDITIONAL Information

MAY 20 '99 20:03 FR BOMBARDIER ACTION CTR416 375 4522 TO TYROLEAN H WINTE P.04/07

PREPARED:f8

BOMBARDIERAEROSPACE SECT 1

PAGE tISSUE I~

-.~------~-------~--------------------------------~----------------~

CHECKED

DATE: May 1999

The following pages detail an Acceptable dent in Skin Panel. 85310045, forward ofX94.0 and between Stringers 21P and 22P. Subject to limitations on following pagesdent is acceptable for continued operation as is.

This repair is void if there is any damage to underlying structure.

This repair will require a special inspection as definedon Page 2. Thisinspection must be incorporated into the operators approved maintenanceprogram.

This Repair is detailed in: RD8-53-4218 Section 1 Pages 1 Iss.l2 Iss.13 155-14 Iss.l

~~m 1 Ti~:~~~----~~~~~+---------+-------~DATE 20IMay/99 Acceptable Dent in Skin Panel,DRAWN Ian "Burns 85310045, Forward of X94.0 andAPPROVED I h1 / ....." Between Stringers 21P and 22P.~V~TV '-

REPORT NUMBER APPLICABILITY

D.

RD8-53-4218DHC-8-300

SIN 527

r-#'L_ ~ ~ ._ ~

A.

R.

MAY 20 '99 20:03 FR BOMBARDIER ACTION CTR416 375 4522 TO TYROLEAN H WINTE P.05/07

PREPAREO: I BRD8-S3-4218

CHECKED BOMBARDIERAEROSPACE· SECT l

PAGE :2'ISSUE 1

DATE: May '99

INSPECTION REQUIREMENTS

This repair affects the airworthiness limitations document and requires anadditional task. The inspection requirements for this task, which are shownbelow, are Transport Canada approved. The operator must incorporate thisadditional task as an amendment in the airworthiness limitationsdocument forthe affected aircraft serial number. It is the operator's responslbllity to obtainapproval of the amended airworthiness limitations document from hisregulatory authority and to incorporate the added inspection task in themaintenance program for the affected aircraft. The time for thresholdinspection is measured from the time of the incorporation of this repair.

Threshold: 16000 Flights

Repeat: 1826 Flights

The above inspection times were determined in Report AEROC 8.4.AC.12,Section 53-0004-1, using the Transport Canada accepted damage toleranceevaluation procedure documented in AEROC 8A.AC.S, Section19.1.

Inspection Method: Detailed Visual Inspection.

Inspection procedures: Perform detailed external visualinspection of dent and immediate vicinity (refer to DASH 8Maintenance Program Manual, PSM 1-83-7, Appendix 1 Glossary).

MAY 20 •99 20: 03 FR BOMBARDIER ACTI ON CTR416 375 4522 TO TYROLEAN H WINTE P. 06/07

PREPAREO I.~(lNSCHeCKED

DATE MA"1 '99

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MAY 20 '99 20:04 FR BOMBARDIER ACTION CTR416 375 4522 TO TYROLEAN H WINTE P.07/07

PREPARED: IB RD8-53-4218CHECKED BOMBARDIER ~

aOMUAmlD SECT 1AEROSPACE·~ PAGE 4

,DATE: May '99 ISSUE 1.

GENERAL NOTES

/I) This repair is void if there is any damage to underlying structure.

/0) ~.fore .installation of the repair, ultrasonic inspecti~n of the b.onded skin and waffle. doubler~ "-. IS required to ensure that no disbonding IS present In the repaII' area. If disbonding IS .

Y~ . found contact Bombardier Aerospace Regional Aircraft before proceeding further.Ultrasonic testing is the preferred method of inspection for skin/waffle doubler

~ (.012.1~ "1Adisbonding. If the preferred method is impractical, or if ultrasonic test facilities are notavailable, an alternative non-destructive inspection procedure may be used provided it isapproved by an appropriate airworthiness authority and is performed by an operator withdemonstrated expertise.

/3) Dent shown on previous page is allowed in skin only and can not affect!YlY underlying

Structure such as stringers, frames and intercostals. Dent must meet criteria outlinedbelow.Dent to be smooth with no sharp corners, nicks, gouges or abrasions.Aspect ratio as defined below must be equal to or greater than 10.

Aspect ratio = Minimum diameter I DepthNote: If the deepest point is not in the centre of the dent, Aspect ratio shall be defined as2Y / Depth, where Y is the minimum distance from the deepest point to the edge of dent.

4) Crack detect using preferred Eddy Current method, per PSM 1-83-7A, Section 51"'()0-06,or fluorescent dye penetrant method. No cracks permitted.

5) Any bare metal to be finished with Alodine and Epoxy Primer.i) Alodine per Structural Repair Manual, PSM 1-83-3, Chapter 51-20-26.ii) Epoxy Prime per Structural Repair Manual, PSM 1·83-3, Chapter 51-20-36 .

. 6) On completion of repair apply thin coat of Corrosion Inhibiting Compound - LPS-3,J Dinitrol AV5B-2 or equivalent - per Maintenance Manual, PSM 1-83-2, Chapter

20-16-01, over internal surfaces of the repair.

** TOTAL PAGE.07 **

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