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Boeing 737 Assembly, the building of this popular City Jet.

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Boeing 737 Assembly

The first 271 Boeing 737 aircraft were manufactured next to Boeing Field which is now officially known as King County International Airport. The Renton factory at this time was still in full-on

Boeing 737 fuselages in the Witchita assembly plant.

production of the Boeing 707 and Boeing 727 aircraft. Production of the Boeing 737 was moved to Renton in late 1970.

Spirit Aerosystems of Wichita, Kansas, who bought some of Boeings’ Witchita assets, manufacture a significant part of the fuselage today.

The completed fuselages are transported by train to Renton.

At the Renton plant the wings, fuselage and landing gear are married together, as well as avionics and interiors being installed as it moves down the assembly line.

The aircraft is jacked up so that the deployment and retraction of the landing gear can be tested. Also, a test called the “high blow” is performed where the interior of the fuselage is pumped full of air to the equivalent pressure differential of 93,000 feet of altitude. This enables the testing for leaks.

In December 2005 a second assembly line was added to increase the production output. This enabled the production of 31 aircraft per month. The current time to assemble an aircraft is eleven days with a future target of just six days. A third production line is being proposed to address the waiting time of three years for a new Boeing 737, a backlog in excess of 1,600 aircraft.

Boeing 737-800 fuselages being transported from Witchita to the final assembly plant.

The completed aircraft is then tested fully before undertaking its maiden flight. The culmination of the maiden flight is at Boeing Field where the aircraft is painted in the customer livery, as well as other customised fit-out requirements. Depending on the customer livery, it takes around 200 litres of paint to cover a 737, some 130 Kilograms in weight. Full tests and fine-tuning take place before the aircraft is ready for delivery to the customer.

As is the case with many modern aircraft, the manufacturing of the various components, some 367,000 for a 737NG, are outsourced to companies all around the world. Some of the main components are supplied as follows:

Boeing 737 Parts Manufacturers

Component Manufacturer
Fuselage, engine nacelles and pylon Spirit AeroSystems, Witchita (previously Boeing)
Slats and flaps Spirit AeroSystems, Tulsa (previously Boeing)
Wings Boeing, Renton, Washington
Doors Vought, Stuart, Florida
Spoilers Goodrich, Charlotte, North Carolina
Tail Fin Xi’an Aircraft Industry, China
Horizontal Stabiliser Korea Aerospace Industries, South Korea
Ailerons Asian Composites Manufacturing, Malaysia
Rudder Bombardier, Belfast, Northern Ireland
Tail Section Alcoa / Shanghai Aircraft Manufacturing, China
Main Landing Gear Doors Aerospace Industrial Development Corp, Taiwan
Inboard Flaps Mitsubishi, Japan
Elevator Fuji, Japan
Winglets Kawasaki, Japan
Forward Entry Door Chengdu Aircraft, China
Over-wing Exits Chengdu Aircraft, China
Wing To Body Fairings BHA Aero Composite Parts Co. Ltd, China
Tail Cone BHA Aero Composite Parts Co. Ltd, China

The Boeing 737 assembly line at Renton.

A Turkish Airlines Boeing 737 is fitted out and ready to receive its seats.

If there is more you want to learn about this airliner, please visit: Boeing 737 HomeBoeing 737 Specs, Boeing 737 Interior, Boeing 737 Order Book, Boeing 737 History,  and Boeing 737 Max.

We welcome your comments below, is there more we could be showing or are there topics you would like to see? Thank you.

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6 thoughts on “Boeing 737 Assembly, the building of this popular City Jet.”

  1. Pingback: How Long It Takes To Assemble A Boeing Plane? – AdamsAirMed

  2. Hi,
    many thanks for all the very interesting informations and data.
    I was wondering whether you have an idea where I can find info regarding used polymers and composites in B737 (nature, location in aircraft, weight…)?

  3. Wow lots of parts made in China. That lousy country cheats on material quality a lot. Doesnt inspire any confidence in me at all to ever want to fly in a junky old 737. Will avoid in future.

    1. Hi John,

      I understand what you’re saying. It reminds me of Back to the Future when Doc Brown says, “Made in Japan? Any wonder it doesn’t work.” To which Marty says, “what do you mean, all the best stuff is made in Japan.” Things change.
      Yes, China turns out a lot of junk, but they are also good at leading-edge stuff as well now. Boeing will have oversight and quality control over work done there. Especially now after what has happened over the MAX. Airbus also manufactures A320s there.
      Cheers Peter

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