The document discusses periodical inspection of aircraft jigs. It provides background on what aircraft jigs are and their purpose in manufacturing aircraft parts accurately and interchangeably. The document then describes the methodology used for high accuracy installation and inspection of aircraft jigs, which is important in the aeronautical industry to minimize costs from variations. Optical tooling is discussed as a method used to precisely measure and check the alignment of aircraft jigs.

1. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
Periodical inspection Of the Aircraft JIG’S
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬

2. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬
An aircraft is conceived as a complete structure, but for manufacturing purposes
must be divided into
– Sections, or main components ==> split into
Sub-assemblies of decreasing size,
resolved into Individual detail parts.
To build every single part, special tools or jig are Required
Aircraft manufacturing and MRO

3. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬

4. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬
What is a Jig?
A Jig is a type of Fixture with means for positively guiding and supporting tools.
For both Jigs & Fixtures:
– Origin: traced back to Swiss watch and clock industry
– Objective: to provide interchangeability, reduction of cost,
and accuracy of the manufactured Individual detail Parts, Sub-assemblies,
Sections, or main components, and finally the complete structure
Jigs & Fixtures’ Advantages
• Ensure the interchangeability and accuracy of parts manufactured,
• Minimize the possibility of human error,
• Permit the use of medium-skilled labor,
• Reduce the manufacturing time,
• Allow the production of repeat orders without retooling

5. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬
Jig & Fixture: different types
• Assembly Fixtures,
• Machining Jigs & Fixtures,
• Drilling Jigs, boring Jigs, etc.
• Welding Fixtures,
• Trim Jigs,
• Control or Master Jig,
• Apply Jig; attaching to a larger jig or an assembly of parts, etc. ...
For every part of structure,
• A mockup is first designed and is made from material such as wood, plaster, etc.,…
• The mockup is used to design and to build the fixtures ensuring the contours and
the external form of the structure,
• The Master Jig is then designed in order to complete the fixture
providing the important reference points, Jig and pin points, and to provide
a Reference for the regular checks of the fixture,
• Thermal expansion of fixtures is important

6. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬
Methodology for High Accuracy Installation of Sustainable Jigs and Fixtures
The accurately measure the parts and of jigs during their installation and periodical
inspection determines the state of their precision, especially for large size products
and applications.
In the aeronautical industry, It is necessary for the installation and periodical
inspection of the jigs and fixtures to be highly accurate in order to minimize the use
of tolerance cost due to variations in jigs and fixture positioning.

7. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬

8. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬
A Use of optical tooling for making precise measurements
- for automotive, aeronautical ,machining and lofting work; alignment telescopes
employed to form basic reference line, and jig transits or optical transit squares to set
up planes perpendicular to base line; accessory tools, such as micrometer, for still
greater accuracy, measurements made in all three-dimensional planes by adding
precision levels to two-dimension system.
One great advantage claimed for optical methods to check alignment of engineering
assemblies is that greater accuracy can be achieved over larger distances, more easily
and quickly ;
optical tooling devices are used to check alignment, levelness and squareness of
components of aircraft jigs
"square" may be established by pair of jig transits, one of which has precision-mounted
mirror on its axle to reflect line of sight
back on itself.

9. June 2018
Periodical inspection
Of the Aircraft JIG’S - 1
‫الطائرات‬ ‫تجميع‬ ‫لجيكات‬ ‫الدورى‬ ‫التفتيش‬