Machining, Fabrication and Inspection of Empennage Final Assembly Jig

(Click on thumbnail to enlarge)Machining, Fabrication and Inspection of Empennage Final Assembly Jig

West Cobb Engineering And Tool Inc. is at the forefront of aerospace tool design, and one of our specialties is fabricating large aircraft assembly fixtures, such as the one pictured here. Used for securing the major components and modules for accurate, true, and square assembly of the fuselage of a large transport plane, precision quality construction was critical to achieving the unforgivingly tight tolerance requirement of the aircraft assembly operation.

Using multidisciplinary engineering software gave us a full spectrum of tools for designing an ergonomic and productivity-enhancing solution for this complex assembly structure. Featuring overall dimensions of 28.5′ in length, 6.5′ in width, and 14.0′ in height, we constructed it from steel and aluminum tubing and applied MIG welding techniques to produce deeply penetrating defect-free joints. We utilized a laser tracking system to measure the spatial geometry with pinpoint precision and resolution to verify the dimensional positional accuracy of ± 0.005″.

Our engineers and programmers have been involved with many aircraft projects, and our integrated approach to this design and build project enabled us to meet our commitment to the customer in terms of cost, schedule, and technical performance.If you are interested in learning more, Contact us today.

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Empennage Final Assembly Jig Project Highlights

Product Name

Aft Fuselage Assembly Jig

Capabilities Applied/Processes

CNC 5-Axis Machining
Laser Tracker
Jig and Fixture


Equipment Used to Manufacture Part

SNK 250 CNC Machine, MIG Welder, Leica Laser Tracker

Overall Part Dimensions

Length: 28.5 ft.
Width: 6.5 ft.

Height: 14 ft.
Estimated Part Weight: 5000lbs

Tightest Tolerances

± 0.005″

Material Used

10″x 10″ and 8″x8-¼” Steel Tubing and Aluminum

Material Finish

Epoxy Painted

In process testing/inspection performed

Dimensional Inspection, Visual Inspection and use of Leica Laser tracker for setting details on jig.

Industry for Use

Aerospace – Large Transport Aircraft

Delivery/Turnaround Time

20 weeks

Standards Met

Customer Specifications, 2D CAD Drawing, CATIA Electronic Model
AS9100 REV D
ISO 9001:2015