Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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Trong quá trình thực tập, tài liệu sử dụng gồm:
- Component Maintenance Manual (CMM).
- Standard Overhaul Practices Manual (SOPM)
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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
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Kỹ sư Roger Khoo – Component Overhaul Division (COD) Engineer -
Messier Services Asia (MSA) - Singapore.
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Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 3
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
(Ký và ghi rõ họ tên)
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 4
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 6
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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I would like to extend my sincere thankfulness to Vietnam Airlines, Hanoi
University of Science and Technology, SAFRAN Representative in Vietnam
and Messier Services Asia Pte Ltd and SAFRAN group for giving me this
internship 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, and
especially 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.

Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 7
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 8
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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MSA Messier Services Asia Pte Ltd
CMM Component Maintenance Manual
SOPM Standard Overhaul Practice Manual
LDG Landing Gear
OEM Original Equipment Manufacture
NDT Non-Destructive Testing
MRO Maintenance Repair Overhaul
Organization
MPI Magnetic Penetrant Inspection

A global player in security solutions
SAFRAN offers state-of-the-art solutions to meet the evolving security
requirements of individuals, businesses and governments, based on
multibiometric technologies, smart cards and secure identification and travel
documents.
I.2. Messier Services
Messier Services is jointly owned by two major aerospace equipment
manufacturers that are also the two subsidiaries of the group : Messier-
Dowty (a leader in the design and manufacture of landing gear systems) and
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 10
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
Messier-Bugatti (a premier manufacturer of braking systems, wheels and
hydraulic equipment).
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On May 01
st
, 2011, the three SAFRAN subsidiaries Messier-Dowty,
Messier-Bugatti and Messier Services merged to form KLLHK)B $MHB
b7m>, creating a world leader in aircraft landing systems and on-ground
movement.
In combining three highly complementary organizations, Messier-Bugatti-
Dowty will be able provide customers with an expanded portfolio of
integrated landing systems and associated equipment and services required
for the aircraft industry of tomorrow.
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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
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 11
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore

7) equipment manufacture’s instruction for continued
airworthiness, 7) in the data which is approved or accepted
by authority. The aircraft component will be at least
disassemble, cleaned, inspected, repaired as necessary,
reassembled and test in accordance with the above specified
data. (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 that
the aircraft or component continue to comply with the
design aspects of the appropriate airworthiness requirements
used for issuance of type certificate for the respective
aircraft type, after it has been damaged or subjected to wear.
(SAR-145.5)
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 13
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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The Overhaul process in MRO is carried out on aircraft component,
to better understand this process, the information need to be known
firstly 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 be

Preventive
Compound
3.Surface
suffering high
pressure or
friction
Base metal Chrome
Primer
(wiped)
4. Top end of
piston
Base metal Cover by oil
5. Hole installed
bushing
Base metal Cad
Primer
(limited
thickness) or
Not Applied.
Cover by
grease
6.Others specified
position
Cad Primer
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 16
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.
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
(3) Objective of overhaul process in MRO on each part or
component:

Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 19
Basic Flowchart of Overhaul Process
(Source: Training document)
Scrap
Incoming
inspection
Disassembly
Cleaning
Stress relief
Part segregation
NDT
Product
verification
Bushing Installation
Painting
Kitting
Assembly
Rework
Testing
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 20
Final inspection
Testing
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
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(1) Receiving Inspection
When the component is sent to MSA, the first procedure of process is
the receiving inspection. All the follow job need to be done by the
team:
 By using Inspection of customer-owned equipment report,

then record scrapped items into the Scrap Log, and order the
replacement part through InfoFlo.
(5) Stress relief
Stress relief is necessary to remove any residual stress built up in
the parts during its operations on the plane. That is to prevent the
part from stress concentration after every process that may
introduce the stress (e.g. machining). The parts will be sent to the
oven for stress relief. This baking process is also known as
annealing where a metal (in this case steel) is heated to a suitable
temperature and the temperature is held constant for a period of
time before being slowly cooled. It is necessary that the parts are
cooled slowly to prevent the build up of thermal stress which
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 22
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
may occur when a large temperature gradient is induced in the
parts due to rapid cooling.
A second objective for this baking process is to soften the parts
when 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 of
material. Normally, the high strength steel is often baked in 4h at
375°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 to
inspect the defect on or near the surface of part. There are some
kinds of defect: crack (open or close), heat damage.
There are some NDT methods used to detect the respective
defect:
 Magnetic Particle Inspection (MPI) is to inspect

iii. Here, the delivery report is also generated for each
component and send to customer. That is to ensure proper
maintenance of vital component information after
overhaul and AD or SB modifications were carried out.
(8) Rework (this will be in detail in the part of report on repair
process)
Nguyễn Đăng Tuyền – Lớp Cơ Khí Hàng Không – KSCLC K51 24
Đồ án tốt nghiệp – Thực tập tại công ty MSA Singapore
In this step, the defect found will be repaired per respective
repair scheme, and the part will be returned to the design
condition or accepted as specified in other cases.
(9) Bushing installation
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. Bushing is
renewal part in overhaul process. This process can be a part of
assembly, and is called pre-assembly. The bushings, some kinds
of them are fabricated at machine shop of MSA, others are
ordered from outside, that depends on the availability of
material.
(10) Painting
This step will apply the relevant top coats for each position as
specified in CMM, the top coats may be: primer, enamel,
corrosion preventive compound.
(11) Kitting
All parts of component are accumulated in a place where they
are kept in some condition while waiting for assembly.
(12) Assembly
The assembly is carried out in accordance with CMM, this
procedure is much more complicated than disassembly, utilizing