Sourcing Aerospace and Defense Parts for Washington State Programs
Washington buyers sit on top of the deepest commercial aircraft supply base in the country, plus a fast growing space cluster in the Kent Valley and the Eastside. The parts are rarely the hard part. The hard part is matching each job to the right approvals, because Boeing work, space startup work and Navy or Air Force work each bring a different rulebook.
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Where Washington's aerospace and defense demand sits
Most of the state's aerospace buying happens in a band along Puget Sound, from Everett in the north to Joint Base Lewis-McChord in the south, with a second cluster east of Lake Washington. Each pocket buys different hardware under different rules.
| Area | Who is there | What tends to get bought |
|---|---|---|
| Everett | Boeing's widebody site, which Boeing describes as the largest manufacturing building in the world by volume. In 2026 Boeing opened a fourth 737 MAX final assembly line here, the North Line. | Production tooling, fixtures, machined fittings and brackets, sustaining and rework parts |
| Renton | Boeing's 737 factory, working toward 47 airplanes a month. 737 wings built there are trucked to the Everett North Line. | Line support tooling, assembly fixtures, detail parts to Boeing specifications |
| Kent and Tukwila | Blue Origin headquarters (in Kent since 2000), Stoke Space headquarters and Nova rocket production, Starfish Space in Tukwila | Engine and valve components in high temperature alloys, structures, test stand hardware, GSE, quick turn prototypes |
| Redmond and Kirkland | SpaceX's Starlink satellite factory in Redmond, L3Harris in-space propulsion in Redmond (the former Aerojet Rocketdyne thruster plant), Amazon's satellite factory in Kirkland | Precision machined spacecraft parts, thruster and propellant system components, production fixtures |
| Pierce County | Joint Base Lewis-McChord, where the 62nd Airlift Wing and the Reserve 446th Airlift Wing fly 40 C-17s | Aircraft support equipment, maintenance tooling, sustainment parts |
| Kitsap Peninsula | Puget Sound Naval Shipyard and Intermediate Maintenance Facility, with sites in Bremerton and Bangor | Naval maintenance parts, fixtures, test and handling equipment |
Decades of this production are why Washington buyers usually have shops within a short drive. They are also why a buyer has to filter hard, because a shop that is excellent for one of these rulebooks may not be qualified for another.
The Boeing rulebook: D6-82479 and D1-4426
If a part goes into a Boeing product, two Boeing documents usually control who can make it and who can process it. Both flow down to every sub-tier shop on the job.
D6-82479, the supplier quality system
Boeing defines its supplier quality management system requirements in D6-82479. Appendix A covers AS9100 for suppliers that design or produce aviation, space and defense products, Appendix C covers AS9110 for maintenance organizations, and Appendix D covers AS9120 for distributors. Which appendix applies is set by the contract. Appendix A suppliers are expected to hold a 9100 certificate from an accredited registrar listed in the IAQG OASIS database, and Boeing reserves the right to assess the supplier itself. Boeing also notes that it does not recognize AS9003 for production approvals.
D1-4426, approved process sources
Boeing purchase clause Q019 requires the seller and any subcontract process source to be, or to use, an approved processor as required by D1-4426, "Approved Process Sources." The approved list is available from the buyer's procurement agent or Boeing's supplier site, and approvals are listed by process, so a shop approved for one anodize or heat treat specification is not automatically approved for another. Each shipment needs a certificate of conformance or process certificate showing:
- Purchase contract number and part numbers
- Trace number where applicable
- Process specification number with revision
- Processing dates
- Name and address of each processor that performed a D1-4426 process
The clause also says buyer approval of a processor does not relieve the seller of its own obligations. For a buyer, the practical step is simple: name the process specification and revision on the request, and ask that the processor's D1-4426 approval for that exact process be confirmed before the part leaves the machine shop. Our special processes page covers how finishing, heat treat and NDT sources get chosen.
Have a part like this?Send it in under a minute. A person replies within 1 business day.Space programs buying from an aircraft supply base
Washington's space companies mostly buy from the same shops that grew up serving Boeing, but they write very different purchase orders. The rules come from the space company's own engineering and quality team, not from D1-4426, so the buyer has to spell them out.
The cluster is real and growing. Blue Origin opened its 232,885 square foot O'Neill Building in Kent in 2020. Stoke Space, founded in Kent in 2019, is building the fully reusable Nova launcher and refurbishing Launch Complex 14 at Cape Canaveral. In SpaceX's IPO filing, the Redmond Starlink plant averaged about 70 satellites a week from December 2025 to April 2026. L3Harris builds chemical and electric thrusters in Redmond, and has announced plans to move that business into a new Rocketdyne venture with AE Industrial, expected to close in the second half of 2026.
What changes when a space buyer uses an aircraft shop:
- Tempo. Development hardware often moves in days and through several revisions. Shops used to long Boeing production runs may need a clear signal that speed and frequent changes are expected.
- Approvals. A finisher on the Boeing list is a good sign, but it is not the same as approval to your own process specification. Say whether you accept the shop's existing approvals or need your own source qualification.
- Materials. Engine and propulsion work leans on nickel superalloys and other high temperature metals. See nickel superalloys for what those alloys do to cost and lead time.
- Cleanliness. Propellant and oxidizer system parts often need precision or oxygen cleaning that general aircraft work does not. See precision and oxygen cleaning.
Some Washington built hardware ends up at Florida launch sites, as with Stoke's work at Cape Canaveral. If your program splits between the two coasts, the Florida page covers delivery to the launch bases, and launch providers covers what pad hardware usually requires.
Defense work at Lewis-McChord and Kitsap
Defense parts for Washington bases add export control and controlled data rules on top of the quality requirements. Plan for a smaller pool of eligible shops.
McChord Field's 62nd Airlift Wing runs Air Mobility Command C-17 operations, and its maintenance group handles all maintenance on the assigned aircraft. On the Kitsap Peninsula, NAVSEA describes Puget Sound Naval Shipyard as the Pacific Northwest's largest naval shore facility, with permanent sites in Bremerton, Bangor and Everett.
When a drawing carries ITAR or EAR markings or CUI, it cannot go through a public web form or to a shop that has not been screened. Handling CUI also brings CMMC requirements for the supplier. Read how we handle controlled programs and our confidentiality and NDA process, and see defense contractors for the flow-downs primes usually require.
Marine climate and corrosion
Western Washington's long wet season and salt air are a real risk to finished parts that sit in storage, in transit or outdoors on test stands. Corrosion protection belongs on the request, not left to the shop's habits.
The National Weather Service's 1991 to 2020 normals put Seattle at 39.34 inches of precipitation a year, with about 156 days of rain, and November is the wettest month. Rain alone is not the problem. Months of high humidity, condensation in unheated buildings and air off Puget Sound are what start corrosion on bare steel, cut edges and dissimilar metal joints.
- Specify the finish and any passivation for stainless parts rather than accepting "as machined" on hardware that will wait for assembly.
- Call out packaging: sealed bags, desiccant or vapor corrosion inhibitor where the part will sit for weeks. See crating and packaging.
- Watch galvanic pairs, such as steel fasteners in aluminum structure on outdoor GSE, and say what isolation or coating you expect.
- Ask how the shop stores work in process between operations, especially when parts wait for an outside process.
For coating choices, see surface finishing.
Freight in and out of Puget Sound
Washington has strong air and ocean gateways, but most of the country's other aerospace centers are a long truck move away, so plan freight before the part is finished.
- Air. Seattle-Tacoma International Airport is the region's main gateway for small, urgent parts. The Seattle page covers its cargo volumes and handling advice.
- Ocean. The Seattle and Tacoma harbors handle container and breakbulk cargo, which suits large GSE and tooling that will not fly.
- Road. Everett, Renton, Kent and the Tacoma area are all on the I-5 corridor, so local pickups and witnessed inspections are practical, but traffic makes same day promises risky.
Oversized fixtures and stands bound for another state usually need engineered crates and a carrier who has moved flight or test hardware before. See shipping flight hardware and lead times and delivery.
Seattle area guide and related services
The Seattle aerospace CNC machining page goes deeper on the Kent Valley space companies, the Everett and Renton machining base, process approvals buyers check and what to write on the purchase order.
For the service itself, start with aerospace CNC machining. For pad, stand and handling hardware, see ground support equipment. Satellite buyers on the Eastside may want satellite manufacturers, and anyone writing a first request should use the RFQ checklist.
Send a Washington parts request
Aerospace Sourcing serves buyers anywhere in the United States. We take your request, match it to qualified suppliers, flow down your quality system, D1-4426 or other process source requirements and inspection needs, check the paperwork, and return one quote, one lead time and one point of contact, even when several shops are involved. A person replies within one business day, and every order ships with a certificate of conformance plus any other certs your request calls for.
If you have a Boeing detail part, a Kent Valley engine component or a fixture for a Washington base, start a machining request and name the process specifications and delivery point so the approvals and freight are planned from the first day.
Local pages in Washington
Send the job. A person replies within 1 business day.
Part, quantity and date are enough to start. Drawings and the mutual NDA follow by reply, and controlled programs never send technical data through this site.
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Questions
What is Boeing D1-4426 and does it apply to my part?
D1-4426, "Approved Process Sources," is Boeing's list of processors approved to perform specific special processes such as finishing, heat treat and NDT. Boeing clause Q019 requires the seller and its process subcontractors to be or use approved processors where D1-4426 applies, and to ship a certificate listing the process specification, revision, dates and each processor's name and address. If your part goes into a Boeing product and your contract invokes Q019, it applies. If it is for a space startup or a defense program, your own specifications usually govern instead.
What does D6-82479 require from a supplier?
D6-82479 is Boeing's quality management system standard for suppliers. Its appendices map to the industry standards: AS9100 for design and production suppliers, AS9110 for maintenance organizations and AS9120 for distributors, with the contract deciding which applies. Production suppliers are expected to hold a 9100 certificate from an accredited registrar listed in the IAQG OASIS database, and Boeing can also assess the supplier directly. Always check the current revision on Boeing's supplier site.
Can a shop that makes Boeing parts make parts for a space startup?
Often yes, and many Washington space companies buy from shops that built their skills on aircraft work. The difference is in the paperwork and pace. A space buyer has to state its own requirements, including material specs, process approvals, cleanliness and inspection, because Boeing's lists do not cover them. Make clear whether existing Boeing process approvals are acceptable or whether your own source qualification is needed.
How should parts be protected from corrosion in western Washington?
Treat it as a requirement on the request. Specify finishes and passivation instead of accepting bare as-machined surfaces on parts that will wait for assembly, call out sealed packaging with desiccant or corrosion inhibitor for storage, and address dissimilar metals on outdoor equipment. Seattle's normals show about 39 inches of precipitation a year over roughly 156 rainy days, and humidity and salt air near Puget Sound add to the risk.
Can you handle ITAR or CUI drawings for a Washington defense program?
Yes, but not through the website. Send the non-controlled details first, such as material, size, quantity, finish and need date. Every supplier signs a flow-down NDA before seeing customer files, controlled data moves only by secure transfer to US persons, and suppliers do not learn the end customer unless you approve it. Our controlled programs and confidentiality pages explain the steps.
Do I need a supplier located in Washington?
Not always. A nearby shop helps when you want to witness a first article, return a part for fast rework or avoid crating oversized fixtures. A special process approval, a large forging or a high volume price can point elsewhere. Many jobs are split, with machining in one place and a process or inspection in another. We coordinate those steps under one purchase order and one point of contact.
Related
Sources
- Boeing: D6-82479 Rev K, Quality Management System Requirements for Suppliers
- Boeing clause Q019: D1-4426 Approved Process Source, Deliverable (10/08/2024)
- Boeing: Everett production facility
- Boeing: New 737 North Line opens (2026)
- The Herald: Boeing will stop production of the Everett-built 767 in 2027
- Blue Origin: Blue Origin opens new headquarters in Kent, Washington
- Kent Reporter: Kent-based Stoke Space raises $510 million (2025)
- GeekWire: SpaceX building about 70 Starlink satellites a week in Redmond (2026)
- Cosmic Log: Redmond rocket factory in for a Rocketdyne rebrand (2026)
- McChord Field: 62nd Airlift Wing fact sheet
- NAVSEA: Puget Sound Naval Shipyard and Intermediate Maintenance Facility
- FOX 13 Seattle: Seattle's new climate normals, warmer and wetter
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