Báo cáo Thực tập tốt nghiệp tại công ty Messier Services Asia (MSA) Singapore

NHIỆM VỤ THIẾT KẾ TỐT NGHIỆP Họ và tên: Nguyễn Đăng Tuyền Lớp: Kỹ thuật Hàng không KSCLC Khóa: 51 Chuyên ngành: Cơ khí Hàng không 1. Đề tài tốt nghiệp Thực tập tốt nghiệp tại công ty Messier Services Asia (MSA) Singapore Studying on Landing Gear Actuator and Flap Carriage Assembly Overhaul Process. 2. Các tài liệu sử dụng Trong quá trình thực tập, tài liệu sử dụng gồm: Component Maintenance Manual (CMM). Standard Overhaul Practices Manual (SOPM) 3. Nội dung các phần thiết kế và tính toán Nội dung gồm 3 phần: Phần I: Tổng quan chung về doanh nghiệp và nội dung thực tập. Phần II: Báo cáo nội dung thực tập tại MSA. Phần III: Mô tả quá trình bảo dưỡng cơ cấu chấp hành càng đáp 4. Cán bộ hướng dẫn Kỹ sư Roger Khoo – Component Overhaul Division (COD) Engineer Messier Services Asia (MSA) Singapore. 5. Ngày giao nhiệm vụ thiết kế: 21022011 6. Ngày hoàn thành: 22062011 TRƯỞNG BỘ MÔN (Ký và ghi rõ họ tên) TS. Nguyễn Phú Hùng Hà Nội, ngày … tháng … năm 2011 CÁN BỘ HƯỚNG DẪN (Ký và ghi rõ họ tên) NHẬN XÉT ĐỒ ÁN TỐT NGHIỆP ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… GIÁO VIÊN HƯỚNG DẪN (Ký và ghi rõ họ tên) NHẬN XÉT ĐỒ ÁN TỐT NGHIỆP ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… NGƯỜI PHẢN BIỆN (Ký và ghi rõ họ tên) ABSTRACT My report comprises three parts: PART I: Introduction PART II: Industrial attachment report. During the nine weeks of attachment in Messier Service Asia, I have learned the basic overhaul process and the knowledge about equipment in a Maintenance Repair Overhaul organization. I practiced the jobs as warranty against OEM in Component Overhaul Division. PART III: Landing gear actuator and Flap carriage overhaul process. The overhaul process in a Maintenance Repair Overhaul always needs to be improved. In this phase, I would like to present the repair process that is applied in Component Overhaul Division. This content is the most interesting thing that I tried to learn within the first half of my internship by understanding the document and the real process. The purpose of this part is to understand the way MRO improves their process.

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Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore

TRƯỜNG ĐẠI HỌC BÁCH KHOA

HÀ NỘI VIỆN CƠ KHÍ ĐỘNG LỰC

BM Kỹ thuật Hàng không và Vu

NHIỆM VỤ THIẾT KẾ TỐT NGHIỆP

Họ và tên: Nguyễn Đăng Tuyền

Chuyên ngành: Cơ khí Hàng không

1 Đề tài tốt nghiệp

Thực tập tốt nghiệp tại công ty Messier Services Asia (MSA) - Singapore

Studying on Landing Gear Actuator and Flap Carriage Assembly Overhaul Process.

2 Các tài liệu sử dung

Trong quá trình thực tập, tài liệu sử dụng gồm:

- Component Maintenance Manual (CMM)

- Standard Overhaul Practices Manual (SOPM)

3 Nội dung các phần thiết kế và tính toán

Nội dung gồm 3 phần:

- Phần I: Tổng quan chung về doanh nghiệp và nội dung thực tập

- Phần II: Báo cáo nội dung thực tập tại MSA

- Phần III: Mô tả quá trình bảo dưỡng cơ cấu chấp hành càng đáp

4 Cán bộ hướng dẫn

Kỹ sư Roger Khoo – Component Overhaul Division (COD) Engineer -

Messier Services Asia (MSA) - Singapore

5 Ngày giao nhiệm vu thiết kế: 21/02/2011

6 Ngày hoàn thành: 22/06/2011

TRƯỞNG BỘ MÔN

(Ký và ghi rõ họ tên)

Hà Nội, ngày … tháng … năm 2011

CÁN BỘ HƯỚNG DẪN

Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 1

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TS Nguyễn Phú Hùng

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NHẬN XÉT ĐỒ ÁN TỐT NGHIỆP

………

GIÁO VIÊN HƯỚNG DẪN

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NHẬN XÉT ĐỒ ÁN TỐT NGHIỆP

………

NGƯỜI PHẢN BIỆN

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My report comprises three parts:

PART I: Introduction

PART II: Industrial attachment report

During the nine weeks of attachment in Messier Service Asia, I have learned thebasic overhaul process and the knowledge about equipment in a MaintenanceRepair Overhaul organization I practiced the jobs as warranty against OEM inComponent Overhaul Division

PART III: Landing gear actuator and Flap carriage overhaul process

The overhaul process in a Maintenance Repair Overhaul always needs to beimproved In this phase, I would like to present the repair process that is applied

in Component Overhaul Division This content is the most interesting thing that

I tried to learn within the first half of my internship by understanding thedocument and the real process The purpose of this part is to understand the wayMRO improves their process

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ACKNOWLEDGEMENT

I would like to extend my sincere thankfulness to Vietnam Airlines, HanoiUniversity of Science and Technology, SAFRAN Representative in Vietnamand Messier Services Asia Pte Ltd and SAFRAN group for giving me thisinternship at the end of five years studying

I would like to thank my professors in my university, Dr Nguyen Phu Khanh,Head of Aeronautics, Excellent Training Program, for supporting me

I won’t able to gain my knowledge and experience without the support of Mr.Lau Chic Kan, Engineering manager, Mr Joo Koh, Mr Chai Kan Kua, andespecially Mr Roger Khoo who has given me a lot of chance to join the job and

to enjoy the life in Singapore

I cannot forget to thank the sharing of all employees of company

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TABLE OF CONTENTS

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ABBREVIATIONS

MSA Messier Services Asia Pte Ltd

CMM Component Maintenance Manual

SOPM Standard Overhaul Practice Manual

FPI Florescent Penetrant Inspection

COD Component Overhaul Division

MSI Messier Services International

CRES Corrosion Resistant

CPC Corrosion Protective Compound

i.a.w In accordance with

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PART I: INTRODUCTION

I.1 SAFRAN GROUP

SAFRAN is a leading international high-technology group with three core businesses: aerospace, defence and security Operating worldwide, the Grouphas more than 54,000 employees and generated sales of 10.8 billion euros in 2010

Through this global presence SAFRAN builds industrial and commercialrelations with the world’s leading prime contractors and operators, whiledelivering fast, local service to customers around the world Comprising anumber of companies, the SAFRAN group holds, alone or in partnership,world or European leadership positions in its core markets

Engines and equipment for air and space

SAFRAN develops, produces and markets engines and propulsion systemsfor civil and military airplanes and helicopters, ballistic missiles, launchvehicles and satellites It also provides a wide range of systems andequipment for civil and military airplanes and helicopters

Defense electronics

Operating in the optronic, inertial guidance, electronics and safety-criticalsoftware markets, SAFRAN offers today’s armed forces a complete range ofoptronic, navigation and optical systems and equipment for use in the air, onland and at sea

A global player in security solutions

SAFRAN offers state-of-the-art solutions to meet the evolving securityrequirements of individuals, businesses and governments, based onmultibiometric technologies, smart cards and secure identification and traveldocuments

I.2 Messier Services

Messier Services is jointly owned by two major aerospace equipmentmanufacturers that are also the two subsidiaries of the group : Messier-Dowty (a leader in the design and manufacture of landing gear systems) and

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Messier-Bugatti (a premier manufacturer of braking systems, wheels andhydraulic equipment)

I.3 Messier-Bugatti-Dowty

On May 01st , 2011, the three SAFRAN subsidiaries Messier-Dowty,

Messier-Bugatti and Messier Services merged to form

Messier-Bugatti-Dowty, creating a world leader in aircraft landing systems and on-ground

Messier-Bugatti-Dowty will be better positioned develop new technologies

in response to future market requirements This includes the increased use of new materials, such as composites and titanium, while introducing more

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electric technologies, such as Green TaxiingTM, which enables aircraft to maneuver on the ground without relying on thrust from the main engines.

Customer focus

Messier-Bugatti-Dowty will also be able to offer fully integrated customersupport and more flexible solutions to meet customer needs The merger willalso consolidate our worldwide presence, with 6,250 employees servicingcustomers in Europe, the Americas and Asia

I.4 Messier Services Asia Pte Ltd (MSA)

- MSA is a subsidiary of the Original Equipment Manufacturer (OEM): Messier - Dowty and Messier - Bugatti The company is a joint venture between Messier Services International (MSI) (60%) and SIA Engineer Company (SIAEC) (a company in Singapore) (40%)

- MSA is an MRO organization (Maintenance-Repair-Overhaul organization)offers extensive repair and overhaul, 24-hour AOG services, distribution andtechnical assistance for a wide range of aircraft landing gears and hydro-mechanical systems

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PART II INDUSTRY ATTACHMENT REPORT

II.1 Component Overhaul process

II.1.1.Definition

(1) Overhaul

 Objective: Overhaul is a process carried out in MRO, that is

to provide the necessary tasks required for certified RepairShop i.a.w Operator’s Regulatory Authority Rules andPractices, and to be Airworthy until the next mandated TimeBetween Overhaul (TBO) period (Messier-Dowty)

 How to do: The process that ensures that the aircraft

component is in complete conformity with all applicable

services tolerances specified in the type certificate holder’s,

or equipment manufacture’s instruction for continued

airworthiness, or in the data which is approved or accepted

by authority The aircraft component will be at leastdisassemble, cleaned, inspected, repaired as necessary,reassembled and test in accordance with the above specifieddata (SAR-145.5)

(2) Repair

 Repair is a process carried out in MRO, that is to restore a

aeronautical product to an airworthy condition to ensure thatthe aircraft or component continue to comply with thedesign aspects of the appropriate airworthiness requirementsused for issuance of type certificate for the respectiveaircraft type, after it has been damaged or subjected to wear.(SAR-145.5)

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II.2 Basic Flowchart of Overhaul Process

II.2.1.Description

The Overhaul process in MRO is carried out on aircraft component,

to better understand this process, the information need to be knownfirstly might be:

 Material, dimension, finish coatings as required by OEM at

every surface of part

 Objective of overhaul process in MRO on each part or

component

 Kinds of defect that need to be inspected and removed

within MRO

(1) Understanding on the part

i As stated in SOPM, in the drawing of part, the information

of material and the finish codes can be found, that will bedecoded by looking up in Practice Manual And in CMM, allfinish coatings are listed and indicated in figures to helpMRO build up the part, the information can be found in item

“Repair” or “Fit and Clearance“ in appropriate CMM ofcomponent

ii Example of figure [Ref: CMM- repair section]

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(2) Finishes on surface of high strength steel

When the finish code of each surface is known, the next step is: look

up in the Practice Manual, section Decoding Finish Code to understandthe finish coating The follow table will give some detail about coating

on the common surfaces

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Chrome plating covers piston rod.

Enamel covers Normal open surface

2 Interior or

closed end tube Base metal

CorrosionPreventiveCompound3.Surface

Cover bygrease

6.Others specified

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Bushing (yellow color) installed on hole after cad plated Bushing is a lining of metal or similar material for a hole, to give the protection from wear or to put replaceable material in the hole or larger part not as economically replaceable.

(3) Objective of overhaul process in MRO on each part or

component:

i Thorough inspection, restore dimension / finish

- Remove organic coating; primer, painting, cad

(PCS-2700, SOPM 20-30-02)

- Remove all bushing, lube fitting, etc

- Renewal of all seal, O-ring, retainer

- Strip and replace chrome & nickel plating on condition

- Unless otherwise specified all part must be returned to

design dimension during overhaul

ii Meet requirement of corrosion prevention (SOPM 20-60-02)

iii Maintain reliable and safe landing gear structure

- Life limited parts, ensure reliable to service for next

overhaul (TBO)

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iv Remove corrosion and surface defects and restore

component to requirements outlined by OHM/CMM/SOPM

- Implement recommended SL/SB improvement

When all the parts of component are met all the requirement ofOEM on Overhaul process, the component will be releasedcertificate to be serviceable

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II.2.2.Basic Flowchart of Overhaul Process

(1) The flow chart below gives the basic steps that the part may gothrough to be given back to serviceable This is my understandingfrom basic repair procedure, that might be not enough to apply for allkind of part but easier to make understand

 The flowchart below just brings some information that generally

explains how the part goes through workshop and the firstimagination about the job at each workshop or office

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Basic Flowchart of Overhaul Process

(Source: Training document)

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 By using Inspection of customer-owned equipment report,

the team will check Part number, serial number,modification and quantities of component in accordancewith the OHM/CMM/Receiving check list

 Inspect physical part and documentation: to record all the

sign of damage, broken part, missing part, addition part etc

 Photo taking

 Receiver is routed together with the customer’s doc to

Commercial Dept

(2) Release of Customer Order

Once the component is received, Commercial Dept will issueCustomer Order Job Form The custom job form and the WorkRecord Sheers are routed to the appropriate Team Leader viaplanner

(3) Disassembly

Disassembly will be carried out in accordance with theOHM/CMM Disassembly section Thus, all the tool andequipment needed (fixture, etc) After this step, the componentwill be segregated to sub-assembly or part with the respectivenumber It is essential that all the bushings present must beremoved from the bores to allow a thorough inspection of thebase metal and to prevent damage during baking Next, organiccoating, primer, painting will be removed (practices standard:PCS -2700, SOPM 20-30-02)

(4) Part segregation

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Here, the part or sub-assembly will be assigned a job number, theprocess will be controlled by using these job number from now

to the end of process

The team will separate the scrapped items with the serviceable,then record scrapped items into the Scrap Log, and order thereplacement part through InfoFlo

(5) Stress relief

Stress relief is necessary to remove any residual stress built up inthe parts during its operations on the plane That is to prevent thepart from stress concentration after every process that mayintroduce the stress (e.g machining) The parts will be sent to theoven for stress relief This baking process is also known asannealing where a metal (in this case steel) is heated to a suitabletemperature and the temperature is held constant for a period oftime before being slowly cooled It is necessary that the parts arecooled slowly to prevent the build up of thermal stress which

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may occur when a large temperature gradient is induced in theparts due to rapid cooling

A second objective for this baking process is to soften the partswhen baked, thus increasing its ductility and reducing the risks

of damage during machining works that will occur later

The temperature will found in SOPM and may depend on kind ofmaterial Normally, the high strength steel is often baked in 4h at375°F/190°C, and material of Aluminium and Titanium have not

to bake

(6) Non-Destructive Testing

The step is mandatory in MRO The purpose of this job is toinspect the defect on or near the surface of part There are somekinds of defect: crack (open or close), heat damage

There are some NDT methods used to detect the respectivedefect:

 Magnetic Particle Inspection (MPI) is to inspect

ferromagnetic parts only, for two kind of crack (closeand open)

 Fluorescent Particle Inspection (FPI) is to inspect

ferromagnetic and non-ferromagnetic material also, butonly for detecting the open crack

 The Nital Etch Test will also be carried out to inspect

for possible heat damage during in service operations

 Eddy current: is to detect the discontinuities of material

It depends on OEM requirement that which method in thesemethods will be carried out for a purpose

(7) Product verification

 This is a very importance job that will determine on what is

the next step for the part In this job, they will do the visualand dimensional inspection; it is to check the surfacecondition and all dimension specified per CMM The result

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Measuring the roughness of machined surface

of this will be found in a form “Inspection ConditionReport” (ICR) and will be used for further repair scheme

i In general, all information involving the condition of thepart from receiving to delivery is kept in the file,Component Condition Report

ii For Life limited part, this job will record the description,part No, serial No, record cycle (or time) since new (oroverhaul): time since new –TSN, TSO, CSN, CSO Thehistory of part will be traced against Back to birth List,Folio 12, and Part Movement Traceability Sheet (PMTS).iii Here, the delivery report is also generated for eachcomponent and send to customer That is to ensure propermaintenance of vital component information afteroverhaul and AD or SB modifications were carried out

(8) Rework (this will be in detail in the part of report on repairprocess)

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In this step, the defect found will be repaired per respectiverepair scheme, and the part will be returned to the designcondition or accepted as specified in other cases

(9) Bushing installation

Bushing is a lining of metal or similar material for a hole, to givethe protection from wear or to put replaceable material in thehole or larger part not as economically replaceable Bushing isrenewal part in overhaul process This process can be a part ofassembly, and is called pre-assembly The bushings, some kinds

of them are fabricated at machine shop of MSA, others areordered from outside, that depends on the availability ofmaterial

(10) Painting

This step will apply the relevant top coats for each position asspecified in CMM, the top coats may be: primer, enamel,corrosion preventive compound

of its importance

(13) Testing

Testing is also carried out in accordance with CMM, testing andassembly are taken care of by Quality Assurance Department,because double check is needed

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inspect the physical unit and will be documented The finding ofdiscrepancy must be rectified.

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An Electrical Unit A Hydraulic Supply Unit

Alternative Tool

II.3 Tooling

II.3.1.Definition

(1) Tool and its functions

i Tool is the instruments or devices the technicians need in order to dotheir job In the Overhaul or repairing process, there are a lot of tasks,each task carried out on a part which requires a relevant set of tool that

is always listed in CMM The tool that can be a simple tool such as aspanner or a complicated system includes many kinds of device such as

a hydraulic supply unit or an electronic unit

ii Tool Classification

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Ring Nut Wrench - Part No: 460007137 - Function: Turn the ring nut

This classification based on how MRO receives tool:

• OEM tool (OEM-Original Equip Manufacturer)

(1) This kind of tool is designed and manufactured by the OEM(e.g Boeing or Airbus), and can only be used without anymodification

(2) To get this tool, The MRO that has a license for accessingOEM website, can download all the design, all the necessarydata is available, such as the operation manual

(3) MRO sometimes encounter some disadvantages of OEM toolbut MRO are not allowed to modify the OEM

• In-house tool

(1) This kind tool is designed by the MRO

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Component storage

(2) It is often used for enhancing and supporting for the job or makesthe work become easier, faster, safer or more economical

• Alternative tool

(1) The OEM tool is available to be used and is provided by the OEM.But some of alternative equivalent is permitted by OEM for theOEM tool So MRO can fabricate the equivalent tool that based onthe design recommended by OEM as long as they can prove thatthis tool has the same functions of OEM tool

(2) The name of OEM tool must be changed in accordance withregulation of OEM The name will have three parts, for example:B737NG / ABC / 0001, in which: B737 NG (stands for Boeing737New Generation) is the type of aircraft is applied, ABC is theequivalent OEM tool’s name, and finally 0001 is the index of this

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tool in a set of alternative tool in MRO that is equivalent to ABCOEM tool.

(3) The advantage of using alternative tool:

- This tool permits the MRO to save time and money and to

reduce the dependence on the OEM

- MRO can add some modifications that depend on their needs

(for more comfortable, safer, faster, more function)

(4) Some relevant notices or restriction from OEM which MRO must

be complied with to help them in building a valid tool

(5) The MRO has to finish the documents and tests relating torationalize the tool (e.g proof test, operation manual)

Example of alternate Tool: Retraction Actuator Fixture (RAF) for

A330/A340

Situation: OEM hasn’t offered the fixture serving for

disassembling the Retraction Actuator, the work requires at leasttwo manpower and risks to damage the part

Solutions: Two employees were in charge solving this problem,

they worked together with a Vendor (a company fabricates toolsand equipments for the MROs) in order to improve the RAF forA330/A340 so that it can be used for the work with RA of A320

Result and analysis: The tool considered as alternate tool that

supports well for the job as the purpose Besides, it also helpscompany in:

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- Saving money by improving one tool to multi-function instead

of fabricating two ones

- Saving space for installing and other involving fee

- Saving time and Improve operation efficiency (safer, using lessmanpower)

- The company ordered two tools from vendor and now the shopcan do any case without waste by waiting: a pair of A330/340,

a pair of A320 or one A330/340 + one A320

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Retraction Actuator Fixture for A330/A340 is added function for A320

 Enhancing the efficiency of tools

 Build the alternative tools or design the in-house tool

 ToolingTooling is a mandatory job in a MRO, together with the othersjob, supports all necessary tools for the process and help MROsave time and expense on tooling The engineer who is in charge

of tooling that may involve many fields (such as: mechanical,Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 32

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hydraulic, pneumatic, electric-electronic) has to support for everytool as required in the document, otherwise they will support forprojects of company to improve the production, for example:Continuous Improvement Program

 Alternative tool is commonly used in MROAlternative tool may give the MRO some advantages such as:

 Much lower cost as compared to OEM tool

 More function as compared to OEM tool

 Much higher portability as compared to OEM tool

 Lower energy consumption as compared to OEM tool

 Not complicated to operate as compared to OEM tool

II.3.2.An example of purchasing the tool

(1) Receive the demands for tool from QA or EngineeringManagement or technician

Some mandatory tasks must be carried out before the purchasingstep According to the purposes of demand, such as for replacingthe broken tools or enhancing the efficiency of work, theinvestigation or technical modification should be introduced whenneeded to make sure that the new tools will serve better than theold ones

(2) In the purchasing step, the engineers who are in charge of toolingwill negotiate with a number of vendors about the quality of tool,the lead time, the cost and the responsibility of vendor in order tofind the best vendors according to the profit made for the MRO.The lead time and responsibility often depends on the relationshipbetween MRO and the Vendor

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Assemble a fixture for retraction actuator

(3) The task the IA student can have opportunity to join is purchasethe new OEM tool for the new maintenance plan The Engineerwill:

 Look up and print the tool drawing and the Manual of tool at

OEM website (e.g Boeing website, choose My Boeing fleet)

 Build the purchase request and send it to at least three vendor

(the organization can fabricate the tool on demand)

 Make a choice of the vendor and send the purchase order to

the purchaser of MRO

 Raise the Purchase Requisition and send to the purchaser

 Do check when receiving tool

 Assemble the tool and instruct the technician the right

operation manner

After receiving the Purchase Requisition, the purchaser will sendthe Purchase Order to the Vendor and monitor the business Thepurchasing will be closed when the procedure of receiving andpayment are finished

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Raise request Purchase request

Fabricate (by Vendor)

Receive Delivery Order Receiving and payment

A close purchasing

(Check)

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II.4 Task assigned at the early period.

II.4.1.Assignment in Warranty against OEM

(1) Understand the procedure

MSA is an MRO; this is a joint-venture between MSInternational and SIAEC, and MSI was formed by two OEMMessier Bugatti and Messier Dowty before the integration thisyear

The service as Warranty against OEM in MSA is understood asbelow:

- When a customer buys new equipment from the OEM, here isMessier -Dowty, every problem arises for a given period oftime from purchasing such as fault will be tested, and thenrepaired or replaced at MSA in accordance with the agreementbetween MSA and OEM

- For the component as Retraction Actuator, the customer will

send it to MSA Firstly, after receiving inspection, MSA will

do the test to check that there is any fault with the component

If there is a fault found (e.g leakage), then they disassemblethe component for further investigation, and they send theFindings report to let OEM know the conclusion on defect andthe relevant disposition to bring the component back toserviceable Finally, OEM will make decision on what should

be done next for the component, and send the spares needed toMRO to repair and send the part to Customer

- The OEM will take care of all the expense involving this job atMRO but in some frame of man-hour

- In MSA, the components can be done here include:

o Change Over Valve, shimmy damper

o Retraction Actuator and brake rod

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Retraction Actuator A320 Boeing747 Brake rod

Shimmy damper B737 NG Change Over Valve A330/340

(2) Observe testing and find the cause

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Here is an example with Retraction Actuator I participated andassist the engineer to do this job.

The procedures for this job are:

a) Get information on reported defect from removal reason inthe accompanying form

b) Check the info: part number and serial number, make surethat meet the info in the form

b Testing of the hydraulic component often requires aHydraulic supply unit, which is capable of supplyingpressure till 3000psi, and a fixture for this component

So all the possible danger should be in mind to protecthuman

c The test with high pressure for many times has to beperformed by an experienced person Someunnecessary step of procedure will be skipped onlywhen having enough experienced The test should be sodone that the fault is verified as soon as possible, at alowest pressure if possible

d The test that is so easy when the fault is so clear, butfor other case, some tips will be applied to clarify thereal fault

e) Disassemble to further investigation

Tiêu đề	Thực tập tại công ty Messier Services Asia (MSA) - Singapore
Tác giả	Nguyễn Đăng Tuyền
Người hướng dẫn	Kỹ sư Roger Khoo – Component Overhaul Division (COD) Engineer Messier Services Asia (MSA) - Singapore
Trường học	Trường đại học Bách Khoa Hà Nội
Chuyên ngành	Kỹ thuật Hàng không
Thể loại	Đồ án tốt nghiệp
Năm xuất bản	2011
Thành phố	Hà Nội

Định dạng
Số trang	76
Dung lượng	15,83 MB