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Maintainability & Maintenance Engineering + Maintenance Planning & Services

XM33 TrainingXM33 Training

Structures Analysistructures Analysis

Practical exampleractical example SSD 52.41SSD 52.41


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MSG-3 ANALYSIS

SIGNIFICANT

STRUCTUREDOSSIER

52.41

Avionics Compartment Access Door

Applicability: A380-800

Date: 26 APR 04

Issue: 2.0

AA338800

STR05


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Dossier: 52.41 Title:Avionics Compartment Access Door Applicability: A380-800 Date: 26 April 2004 Page: 1.1

A380 Maintenance Program Significant Structure Dossier List of Revisions

Issue Date Reason for Revision Approval

1.0 26 JAN 04 Original Issue

Company/Department/Name Signature Date

Prepared by: LATECOERE / Customer Service / Nicolas Soret

Checked by: A irbus / SEM2T2 / Frdric GasztowttApproved by: Airbus / SEM2T2 / Grard Echeveste

2.0 26 APR 04 Lining add in the access

TPS Type I specified in the mechanism area.

Prepared by: LATECOERE / Customer Service / Nicolas Soret

Checked by: A irbus / SEM2T2 / Frdric GasztowttApproved by: Airbus / SEM2T2 / Grard Echeveste

STR06


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Dossier: 52.41 Title:Access Doors Applicability: A380-800 Date: 26 April 04 Page: 2.1

A380 Maintenance Program Significant Structure Dossier List of Effective Pages

Page Description Applicability Date Page Description Applicability Date

0.1

1.1

2.1

3.1

5.1

5.2

5.3

5.4

5.5

5.6

5.7

5.8

5.9

5.10

5.11

5.12

5.13

Cover Sheet

List Of Revision

List of Effective Pages

List of Effective SSI Analysis

Supporting Data Sheet













A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

6.1

7.17.2

8.1

9.1

10.1

11.1

SSI Management List

SSI diagrams SheetSSI diagrams Sheet

SSI Requirements Summary Sheet

SSI Requirements Consolidation Sheet

MRBR Report Interface Sheet

Task Data Sheet

A380-800

A380-800A380-800

A380-800

A380-800

A380-800

A380-800

26 Apr 04

26 Apr 0426 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

26 Apr 04

STR07


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A380 Maintenance Program Significant Structure Dossier List of Effective SSI Analyses

SSI SSI Title Applicability Issue Date SSI SSI Title Applicability Issue Date

52.41.S001

52.41.S002

Avionics compartment access door skin,external surface

Avionics compartment access door,internal structure including door stopsfittings.

A380-800

A380-800

1.0

1.0

26 Apr 04

26 Apr 04

STR08


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A380 Maintenance Program Structures Supporting Data Sheet

Dossier: 52.41 Title:Access Doors Applicability: A380-800 Date:26 April 04 Page: 5.1

510 mm

UP

FWD

690mm

FR 12

FR 14

STR 59

STR 65

510 mm

UP

FWD

UP

FWD

690mm

FR 12

FR 14

STR 59

FR 12FR 12

FR 14FR 14

STR 59

STR 65

Location and Description

The Avionics Compartment Access Door is installed on the Nose Lower Unit of the section 11/12 (pressurized area). It is located between FR12 and FR14 andbetween STR59 to STR65 LH

The door opens up inside the fuselage and provides access to the avionics compartment. The door can be opened from the inside or from the outside of the aircraft.

A latching mechanism keeps the door in the closed and latched position. A compensating mechanism reduces the force which is necessary to operate the door andmaintained the door in the open position.


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EXT. STRUCTURESKIN PANEL INT. STRUCTURE DOOR MECHANISM

INTERNAL HANDLE

EXTERNAL HANDLE

Main design principle

The Avionics Compartment Access Door is of plug in type design.

Main Components

Door Structure,

Door Seal,

Door Fittings,

Door Mechanism,

Door Suspension and Compensating Mechanism.


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Door Structure

The Avionics Compartment Access Door structure includes:

- a bended skin made from aluminium alloy CLAD 2024 T3,

- 2 machined beams made from aluminium alloy 7175 T7351,

- 4 bended frames made from aluminium alloy CLAD 2024 T42,

- 2 machined frames made from aluminium alloy 7175 T7351,

- 2 strips skin made from aluminium alloy CLAD 2024 T42,

- 6 finger plates made from aluminium alloy CLAD 2024 T42,

- 2 splices made from aluminium alloy CLAD 2024 T42.

Rivets universal head are used to assembly the primary structure. The door structure forms compartments for the installation of the latching mechanism. A guardcovers the latching mechanism. FINGER PLATE

STRIP SKIN

BEAM

INTERNAL HANDLE

HINGED ARMS

DOOR SEAL

DOOR STOP FITTING

COMPENSATING MECHANISM ATTACHMENT

FRAME

GUARD


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Door stop fitting

Fuselage stopfitting

Pin (15-5 PH)

UP

FWD

Door stop fitting

Fuselage stopfitting

Pin (15-5 PH)

UP

FWD

Door Seal

A round seal made from elastomer provides an aircraft pressurisation seal. Retainers and screws attach the seal to the door structure. The seal makes the avionicscompartment pressure-tight and prevents the penetration of water.

Door FittingsFour door stop fittings made from titanium alloy Ti6AI6-4V transfer the load pressure to the fuselage and allow to adjust the door flush with the fuselage skin.


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ACCESSIBILITY CONDITIONS

External fuselage

External Access is identified as door 811 as presented on the following illustration :


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16/44



DRAINAGE PROVISIONS

Holes in the frames, the beams and the strips skin allows the water drainage when the door is opened. Some typical drainage provisions are shown below:

Dia = 8 mm

Dia = 8 mm

Dia = 8 mm

Dia = 8 mm

Dia = 8 mm


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EQUIPMENT AND SYSTEMS INSTALLATIONS:

ATA on the avionics compartment access door System Repercussion on the Nose Fuselage Structure

52 (systems) Doors mechanism No repercussion


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CORROSION PREVENTION

Nose fuselage is divided into different areas, according to environmentalconditions.

- Category A Contact with air/condensation, easy accessible dryareas

- Category B Contact with fuel (included pipes/pipe areas)

Category C Area which can be contaminated by : hydraulicfluid, toilet or galley liquids, water, lubricants, etc

Area in which condensation forms and/or iscollected to a greater extend

Areas of difficult access

Areas with a high risk of accidental damage

Category C is subdivided into :

- Cat. C1 Areas in contact with water, moisture andoccasional exposure to other liquids and/or areaswith a high risk of accidental damage

- Cat. C2-1 Areas in contact with water, moisture and frequentexposure to other liquids

- Cat. C2-2 Areas in which water, moisture and other liquids

can collect and areas of difficult access

Section Section


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TEMPORARY PROTECTIVE SYSTEMS (TPS)

Water repellent fluids (WRF) and/or corrosion inhibitors (CI) shall be applied in areas which are very humid and where water may collect. TPS type III material(Socopac 65H or ARDROX AV15) shall be applied. In Mechanism area TPS Type I is applied instead of type III

The purpose is to reduce the risk of liquid penetration into small gaps, cracks in paint around fasteners etc. and to supply an additional protection required by someairlines. To maintain this protection, repetitive application in-service is required.

Temporary protection (Water repellent / Corrosion inhibitor) - AIMS 09-08-003

Note: applied on metallic structure only

LH side shownRH side symmetrical

FR0FR22


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MODS PAGE:

MODN

MODPROPOSAL

N

ATA TITLE/DESCRIPTION P.O.E. SSIsAFFECTED

60002 ------ 52.40 FUSELAGE - NOSE FORWARD FUSELAGE - DEFINE

SECTIONS 11/12 LOWER UNITS OF THE A380-800 BASIC

AIRCRAFT

MSN1 &

Subsequent

All


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A380 Maintenance Program Structures SSI Management List


Acc. DamageANALYSIS

ED/CPCPANALYSIS

AgingANALYSIS

Fatigue DamageANALYSIS

SSINumber SSI Description A

pplicab

ility

Design

Concept

Typeof

Material

Included

Covered by Included

Covered by N/A

Included

Covered by N/A

Included

Pending

Covered by N/A

52.41.S001 Avionics compartment access door skin, external surface -800 DT MET X X X X

52.41.S002 Avionics compartment access door, internal structure including doorstops fittings.

-800 DT MET X X X X

STR11


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24/44


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MSG-3

ANALYSIS

Date: Page:

A380A380

A380-800

Applicability

ATA Chapter No.

SS Dossier No.

SSI No.:

Title

Issue:

52

52.41

MSG-3

ANALYSIS

52.41.S001

MSG-3 ANALYSIS FOR STRUCTURECover Sheet

STR13

Avionics compartment access

door skin, external surface

Prepared by: Nicolas SORET

Approved by: AIRBUS/SEM2T2/FREDERIC GASZTOWTT 02

Doors

Access Doors

Date: 26 April 2004

Date: 26 April 2004


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MSG-3

ANALYSIS

Date: Page:

A380

Applicability

A380-800

Issue

No. Reason for RevisionDate

List of Revisions

STR14

SSI No.: 52.41.S001

26 April 2004

ORIGINAL ISSUE26 Jan

2004

26 April

2004

01

1.0

02 SECOND ISSUE ; FILIFORM CORROSION DELETED AFTER MWG5#3 DECISION


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MSG-3

ANALYSIS

Date: Page:

A380

Applicability

26 April 2004

Page Description Date


STR14a

Applicability

A380-800

2.0

LIST OF REVISION

LIST OF EFFECTIVE PAGES

DATA SHEET

ILLUSTRATION SHEET

ACCIDENTAL DAMAGE ANALYSIS SHEET-METALLIC

ED AND CPCP ANALYSIS SHEET - METALLIC

1.0

2.0

3.0

4.0

5.0

7.0

7.0

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

SSI No.: 52.41.S001

26 April 2004

26 April 2004

26 April 2004

26 April 2004

26 April 2004

26 April 2004


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MSG-3

ANALYSIS

Date: Page:

A380 Data Sheet

26 April 2004

Description:

Zones: Access:

MaterialItem

Type of Material:Design Concept:

Protection

DAMAGE TOLERANT

AVIONICS COMPARTMENT ACCESS DOOR SKIN, EXTERNAL SURFACE

800

METALLIC

Applicability

STR15

CAA + PRIMER + TOP COAT

IVD + SEALANT

N / A

CLAD 2024-T3

T6AL-4V

A380-800

3.0

1. DOOR EXTERNAL SKIN

2. FASTENERS (INTERACTIVE PARTS)

SSI No.: 52.41.S001


29/44

MSG-3

ANALYSIS

Date: Page:

A380 Illustration Sheet

ILLUSTRATION: NOT IN MAINTENANCE CONDITIONApplicability

STR17

A380-800

4.0

SSI No.: 52.41.S001

UP

FWD

1

510 mm

690mm

26 April 2004


30/44

MSG-3

ANALYSIS

Date: Page:

A380 Accidental Damage Analysis Sheet - Metallic

2

1

4

3

5

Damage sources

Cargo handling equipment

Ground handling equipment

Operations procedure

Maintenance procedure

Weather effects

7

6

8

9

Runway debris

Bird strike

Manufacturing defects

Others

Damage Descriptionlikely unlikely

Damage selected:

(type, location, size)

Fatigue Impact:

Environmental Impact:

Remarks:

DETERIORATION OF PROTECTION, SCRATCHES


No Yes Damage to be considered in fatigue damage analysis

No Yes Damage to be considered in environmental deterioration analysis

Accidental Damage covered by another SSI?

No Yes SSI No.:

Applicability

STR18

A380-800

5.0

DETERIORATION OF PROTECTION, SCRATCHES.

SSI No.: 52.41.S001


26 April 2004


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MSG-3

ANALYSIS

Date: Page:

A380 ED and CPCP Analysis Sheet - Metallic

Threshold

Inspection Level

TPS

Interval

CPCP RequirementCOMPARE WITH ED REQUIREMENTS

AND CONSOLIDATE IN A UNIQUE

ED/CPCP REQUIREMENT

Threshold

Inspection Level

Interval

Sampling

Type of corrosion

ED RequirementPotential type of

corrosionStress

corrosion ratingEnvironmental

ratingProtection

ratingInspection

interval

Filiform

Uniform

Pitting

Intergranular

Fretting

Crevice

Galvanic

Microbiological

100% Threshold

Inspection Level

TPSType:

Interval

ED/CPCP Requirement

Sampling

Sampling Threshold

Zonal

AD to be considered?Material Selection:

Remarks / Justification:

CLAD 2024-T3 (CLAD SHEET 0.8


32/44

MSG-3

ANALYSIS

Date: Page:

A380A380

A380-800

Applicability

ATA Chapter No.

SS Dossier No.

SSI No.:

Title

Approved by: AIRBUS/SEM2T2/FREDERIC GASZTOWTT Issue:

52

52.41

Prepared by: Nicolas SORET

MSG-3

ANALYSIS

52.41.S002

MSG-3 ANALYSIS FOR STRUCTURECover Sheet

STR13

Avionics compartment accessdoor, internal structure includingdoor stops fittings.

02

Doors

Access Doors

Date: 26 April 2004

Date: 26 April 2004


33/44

MSG-3

ANALYSIS

Date: Page:

A380

Applicability

A380-800

Issue

No. Reason for RevisionDate

List of Revisions

STR14

SSI No.: 52.41.S002

1.026 April 2004

ORIGINAL ISSUE26 Jan

2004

26 April

2004

01

02 SECOND ISSUE: LINING TO BE ADDED IN THE ACCESS REQUIREMENT

TPS TYPE I SPECIFIED IN THE MECHANISM AREA


34/44

MSG-3

ANALYSIS

Date: Page:

A380

ApplicabilityPage Description Date


STR14a

Applicability

A380-800

2.0

LIST OF REVISION

LIST OF EFFECTIVE PAGES

DATA SHEET

DATA SHEET (CONT)

ILLUSTRATION SHEET

ACCIDENTAL DAMAGE ANALYSIS SHEET-METALLIC

ED AND CPCP ANALYSIS SHEET - METALLIC

1.0

2.0

3.0

3.1

4.0

5.0

7.0

SSI No.: 52.41.S002

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

A380-800

26 April 2004

26 April 2004

26 April 2004

26 April 2004

26 April 2004

26 April 2004

26 April 2004

26 April 2004


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MSG-3

ANALYSIS

Date: Page:

A380 Data Sheet

Description:

Zones: Access:

MaterialItem

Type of Material:Design Concept:

Protection

DAMAGE TOLERANT

AVIONICS COMPARTMENT ACCESS DOOR, INTERNAL STRUCTURE INCLUDING DOOR STOPS FITTINGS.

811

METALLIC

Applicability

STR15







811, LINING

CLAD 2024-T3

7175-T7351

7175-T7351

CLAD 2024-T42

CLAD 2024-T42

7175-T7351

A380-800

3.0

1. DOOR SKIN

2. UPPER BEAM

3. LOWER BEAM

4. DOOR FRAME (UPPER PART)

5. DOOR FRAME (CENTRAL PART)

6. DOOR FRAME (LOWER PART)

SSI No.: 52.41.S002

26 April 2004


36/44

MSG-3

ANALYSIS

Date: Page:

A380 Data Sheet

MaterialItem ProtectionApplicability

SSI No.: 52.41.S002

STR16

3.1




CAA + PRIMER + TOP COATNO PROTECTION

PASSIVATED

IVD

CLAD 2024-T42

CLAD 2024-T3

CLAD 2024-T42

CLAD 2024-T42Ti6Al6-4V

15-5 PH

T6AL-4V

7. SPLICE (UPPER AND LOWER)

8. HANDLE SUPPORT PLATE

9. FRONT STRIP SKIN

10. BACK STRIP SKIN11. DOOR STOP FITTING

12. STOP PIN

13. FASTENERS (INTERACTIVE PARTS)

A380-800

26 April 2004

+ TPS TYPE III & I APPLIED


37/44

MSG-3

ANALYSIS

Date: Page:

A380 Illustration Sheet

Illustration: NOT IN MAINTENANCE CONDITIONApplicability

STR17

A380-800

4.0

SSI No.: 52.41.S002

FWD

11

12

10

3

1

2

7

4

5

8

UP

FWD

6

9

11

690

mm

510mm

7

26 April 2004


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MSG-3

ANALYSIS

Date: Page:

A380 Accidental Damage Analysis Sheet - Metallic

2

1

4

3

5

Damage sources

Cargo handling equipment

Ground Handling equipment

Operations procedure

Maintenance procedure

Weather effects

7

6

8

9

Runway debris

Bird strike

Manufacturing defects

Others

Damage Descriptionlikely unlikely

Damage selected:

(type, location, size)

Fatigue Impact:

Environmental Impact:

Remarks:


No Yes Damage to be considered in fatigue damage analysis

No Yes Damage to be considered in environmental deterioration analysis

Accidental Damage covered by another SSI?

No Yes SSI No.:

Applicability

STR18

A380-800

5.0

DETERIORATION OF PROTECTION, SCRATCHES.

SSI No.: 52.41.S002

26 April 2004


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MSG-3

ANALYSIS

Date: Page:

A380 ED and CPCP Analysis Sheet - Metallic

Threshold

Inspection Level

TPS

Interval

CPCP RequirementCOMPARE WITH ED REQUIREMENTS

AND CONSOLIDATE IN A UNIQUE

ED/CPCP REQUIREMENT

Threshold

Inspection Level

Interval

Sampling

Type of corrosion

ED RequirementPotential type of

corrosionStress

corrosion ratingEnvironmental

ratingProtection

ratingInspection

interval

Filiform

Uniform

Pitting

Intergranular

Fretting

Crevice

Galvanic

Microbiological

100% Threshold

Inspection Level

TPSType:

Interval

ED/CPCP Requirement

Sampling

Sampling Threshold

Zonal

AD to be considered?Material Selection:

Remarks / Justification:

7175 T7351(ROLLED PRODUCTS 6


40/44


Threshold CandidateSSI

RequirementReference Zone Access

Insp.Level SSI Description Sample 100% Interval Applicab. Zonal ALI

52.41.S001.ED01811 N/A GVI Avionics compartment access door skin, external surface - 6 Yrs 6 Yrs A380-800 MWG5-TS-005 N/A

52.41.S002.ED01811 811, Lining

DET Avionics compartment access door, internal structure

including door stops fittings .

TPS Application: Type III & I

- 6 Yrs 6 Yrs A380-800 N/A N/A

STR27


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A380 Maintenance Program Structures SSI Requirements Consolidation Sheet

Dossier:52.41 Title:Access Doors Applicability:A380-800 Date: 26 April 2004 Page: 9.1

ThresholdMPPTask

Reference

SSIRequirement

Reference Zone AccessInsp.Level

SSI Description

Sample 100% Interval Applicab. Remarks

52.41.01.01.1 52.41.S002.ED01 811 811, Lining DET Avionics compartment access door, internalstructure including door stops fittings.


- 6 Yrs 6 Yrs A380-800

A380 Maintenance Program Structures MRB Report Interface SheetMRBR


42/44

Dossier:52.41 Title:Access Door Applicability:A380-800 Date: 26 April 2004 Page: 10.1

ThresholdMPPTask

Reference

MRBRTask

Number Zone Access

Insp.Level MRBR Task Description Sample 100% Interval Applicab. Remarks

52.41.01.01.1 TBD 811 811, Lining DET Avionics compartment access door, in ternalstructure including door stops f ittings.


- 6 Yrs 6 Yrs A380-800

A380 Maintenance Program Structures Task Data Sheet

MRBR

Task Zone Access I

Elapsed Time : TBD

N f M 1


43/44

TaskNumber

Zone Access Insp.

LevelMRBR Task Description

52..41.01.01.1 811 811, Lining DET Avionics compartment access door, internal s tructure including door

stops fittings.

.

No. of Men : 1

Man Hours : 1

Skill : TBD

Material : --

Tool /GSE : N/A

AMM Ref. : TBD

Dossier:52.41 Title:Access Doors Applicability:A380-800 Date: 26 April 04 Page: 11.1

(1) Make sure the inspection area is clean

(2) Inspection

(1) Do a detailed inspection of the Avionics compartment access door, internal structure including door stops fittings..

(2) Make sure that there is no :(a) Corrosion damage :(b) Other damage (cracks, scratches, marks, dents ,bumps,..) :

Re-apply Temporary Protection system in this area.

Note: TPS type III to be applied except in the mechanism area where type I should be applied.


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