How to Cut Aerospace Lead Times: A Buyer's Playbook

Updated October 13, 2026

The short answer: attack the waits you control

You cut an aerospace lead time by removing waits, not by asking the machine shop to run faster. The waits that usually set the date are material, the special process chain, first article and source inspection, and paperwork holds, and a buyer controls more of them than the supplier does.

The lead times and delivery reference explains each stage of a typical job. This page is the buyer's side: what you can decide, release or approve before and after the PO so those stages overlap or disappear.

The rest of this page takes each lever in order, then covers expedites, DPAS ratings and how to read a quoted lead time. To plan backwards from a need date, use the need date planner.

Map the special process chain before you place the order

Ask every supplier for its planned routing, because special processes run one after another and each one adds a trip out, a queue and a cert.

A heat treated and anodized aluminum part is a good example. A common route is rough machine, solution heat treat and age, finish machine, penetrant inspection, anodize, then final inspection. That is at least three outside steps if the shop does not do them in house, and none of them can start until the step before it is complete and certified. A stainless part might go machine, passivate, then precision clean, where the cleaning has to be last because anything after it would contaminate the part.

Once you see the routing, you can do three things:

• Approve processors up front. If your quality clauses require approved or Nadcap accredited processors, confirm the supplier's chosen processors are acceptable at quote time. Discovering an unapproved anodizer after the parts are machined costs a requalification or a new source.
• Batch steps that can share a trip. Two of your part numbers going to the same plater on the same spec can travel together if the PO dates allow it.
• Challenge steps that are not on the drawing. Some routings include stress relief or extra cleaning out of habit. Ask whether each step is required by the drawing, the spec or the shop's own practice.

Processes and their specs are covered in heat treatment, surface finishing and nondestructive testing.

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Pre-buy material and approve substitutions in writing

If material is the long pole, take it off the critical path yourself: either buy it ahead of the part order or approve acceptable alternates before the supplier has to ask.

Pre-buying

Pre-buying works best on alloys, tempers and forms you use repeatedly, or on a program where the part design is stable but the release is late. You have three ways to do it:

• Buyer-furnished material. You buy certified stock and ship it to the supplier. You carry the inventory and must hand over the mill certs and traceability with it, and the supplier must control it as customer property.
• Material-only purchase order to the part supplier. The supplier buys and holds stock against your PO before the part order is released. Agree in writing who owns it and what happens if the part order never comes.
• Long-lead release on the part order. Covered below.

Approving substitutions

Substitution is a design authority decision, not a buyer decision. A supplier must not change material, form or specification without written approval, and many purchase order quality clauses say so explicitly. What you can do is get the approvals early. Before the RFQ goes out, ask engineering which of these are acceptable:

• A larger standard bar or plate size, or bar instead of plate, where grain direction allows.
• An equivalent material specification for the same alloy and temper.
• A different product form, such as a forging versus machined plate, which may change properties and is often not acceptable on structural parts.

Put the approved alternates on the RFQ so every supplier quotes the same options. If DFARS specialty metals rules apply, an alternate source must still comply; see DFARS specialty metals and material certs and traceability.

Clear drawing questions before the PO, not after

Every open question after award is a stopped clock, so run a short clarification round during quoting and put the answers on the PO.

The questions that most often stop jobs are predictable: a missing or conflicting revision between the model and the drawing, a finish note with no type or class, a tolerance that cannot be measured as dimensioned, a material called out by a cancelled spec, an unclear key characteristic, and marking instructions with no method or location. Ask suppliers to send their questions with the quote, answer them in one document, and reference that document by number and date on the PO. Name one person on your side who answers technical questions and commit to a turnaround. A supplier waiting two weeks for an answer has not started your lead time, whatever the PO date says.

The RFQ checklist lists what a complete package contains, and the RFQ builder helps you assemble one.

Release long-lead items early

When a few items drive the date, release them separately and ahead of the main order instead of waiting for the full package to be ready.

Typical long-lead items are uncommon material, forgings and castings that need tooling, purchased components with long factory lead times, and fixtures or tooling for a new part. A limited release lets the supplier start those while the rest of the design or contract is still closing. Make the release explicit:

• State exactly what is authorized: material only, tooling only, or work up to a named operation.
• State a not-to-exceed value and what you pay if the main order is cancelled or changed.
• State the drawing revision the release is based on and how a later revision will be handled.
• Flow down the same quality requirements as the final order, so material bought early is certified and traceable to the same spec.

Obsolete or allocation-constrained components are the extreme case. Start the search as soon as the bill of materials is stable; obsolete parts sourcing and counterfeit parts avoidance explain why those buys cannot be rushed at the end.

Run work in parallel and split quantities

Overlap the steps that do not depend on each other, and split the quantity when you need a few parts before you need all of them.

• Split by operation across suppliers. On an assembly, detail parts, purchased hardware and harnesses can be made in parallel by different shops and kitted at the end, which is the logic behind kitting.
• Pilot lot first. Order a small first lot that goes through first article, then release the balance once the FAI is accepted. You get parts sooner and you avoid scrapping a full lot if the first article finds a problem.
• Split shipments. Ask for a partial delivery from the same lot. Each shipment needs its own paperwork, and some customers want a separate cert for each.
• Second source. Splitting a quantity between two suppliers halves each queue but doubles first article work and introduces two process histories for the same part.

Splits cost money in setups, inspection and documents. Use them when the date matters more than unit cost, and decide before the PO so suppliers can quote it.

Schedule first article and source inspection at the start

Finished parts often wait for an inspector or a reviewer, so book both when the job is released, not when it is ready to ship.

For first article, agree the report format, who on your side reviews it and how fast. AS9102 governs the content; the triggers and partial FAI rules are explained on the first article inspection page. A supplier can send the FAI as soon as the first part is inspected, while the rest of the lot finishes.

Source inspection needs the same planning. On government contracts, FAR 46.402 directs agencies to perform quality assurance at source in specific cases, such as when inspection elsewhere would require uneconomical disassembly or destructive testing, or when special instruments or facilities exist only at the source. Under FAR 46.405, government quality assurance at a subcontractor is performed only when required in the government's interest, and the prime may be asked to arrange timely access to the subcontractor's facility. If your contract or your customer requires source inspection, put it on the PO, tell the supplier when the inspector will need to see the parts, and give the inspector advance notice. The same applies to customer source inspection by a prime's own quality representative.

Remove paperwork holds before they happen

A part with a missing or wrong document is not shippable and not acceptable at receiving, so list every required document on the PO and review certs as they arrive.

The common holds are predictable: a material cert to the wrong spec or revision, a process cert that does not name the spec, class or the parts it covers, a certificate of conformance with no reference to the PO line or revision, no record of the processor's approval, and a missing DPAS statement on a rated order. Ask suppliers to send material and process certs as each step completes so problems surface while there is still time to fix them. Your receiving team works from the same list; see receiving inspection and certificates of conformance.

Expedite fees versus schedule recovery

An expedite fee buys capacity, not physics: it can shorten machining and freight, but it cannot shorten a mill run, another company's heat treat queue or a review that has not happened.

Before paying an expedite, ask the supplier which step the fee changes and by how many days, and get the revised date in writing.

DPAS rated orders, only where they legitimately apply

A DPAS rating changes a supplier's legal obligations only on orders that genuinely support an authorized defense or other approved program, and it does not make a supplier work faster when the date can already be met.

Three points from 15 CFR Part 700 matter for schedule planning:

• Preference applies only when the date is at risk. Under 700.14(a), modifying production or delivery schedules is necessary only when required delivery dates for rated orders cannot otherwise be met.
• Ratings cover services and packaging, not only parts. Under 700.17(a), rated orders must be used to obtain items incorporated into the product, containers and packaging, and services needed to fill the rated order. A heat treat or plating step for a rated part is placed as a rated order too.
• Mixed orders are allowed, with limits. Under 700.17(d), rated and unrated quantities may share one PO only if the rated quantities are separately identified, and preferential treatment applies only to the rated quantities. Under 700.17(f), a rating is not required on an order below $125,000 or one half of the simplified acquisition threshold, whichever is greater, if delivery can be obtained in time without it.

Never place a rating on commercial or unrated work to jump a queue. 15 CFR 700.74 makes willful violations of the regulation a crime. The full rules, including how to read a rating and the acceptance windows, are on DPAS rated orders.

How to read a supplier's lead time quote

Read a quoted lead time as a set of assumptions, and ask the supplier to state them, because two quotes of the same number can mean very different delivery dates.

• When the clock starts, and in what units. "8 weeks ARO" means eight weeks after receipt of order. Ask whether it is calendar or working time, and whether the clock starts at the PO, at release of the final drawing, at answers to questions, or at receipt of furnished material.
• What is assumed in stock. A short quote may assume material is on a distributor's shelf today. Ask whether material is in hand, reserved or still to be bought.
• Which outside processes are included and whether the quoted processors are on your approved list.
• Inspection and documents. Whether FAI preparation, your review time and any source inspection are inside the number or outside it.
• Ship or deliver. Dock date at the supplier or at your receiving dock.
• The long pole. Ask which step sets the date and what would shorten it.

The most useful answer is a milestone schedule: material in, machining complete, each outside process back, FAI submitted, ship. It lets you compare quotes on the same basis and spot a slip at the first milestone instead of at the ship date. Feed those milestones into the need date planner to work backwards from the date your assembly line or launch campaign needs the part.

What to put on the PO or RFQ

1. Required delivery date at your dock, and whether partial shipments are allowed.
2. Drawing and model revision, plus the clarification document number and date that resolved supplier questions.
3. Material specification and the approved alternates by size, form or spec, with the approving authority.
4. Any buyer-furnished material, with its certs and the custody requirements.
5. Limited release terms for long-lead material or tooling: scope, not-to-exceed value and cancellation terms.
6. Special processes by spec, and whether processors must be approved or Nadcap accredited.
7. FAI requirement, report format and your review commitment; any customer or government source inspection.
8. Required documents: certificate of conformance, material certs, process certs, FAI, test reports.
9. DPAS rating, program symbol and the regulatory statement, only if the order is genuinely rated.
10. A request for a milestone schedule with the order acknowledgment.

Get a lead time you can plan around

If a date matters, send the drawing, specs and required date with any approved alternates and long-lead items marked. We match the job to qualified suppliers, ask for the routing and milestones up front, flow down your requirements including any DPAS rating, track each step, and check the certificate package before the parts ship. A person replies within one business day, and rush requests are prioritized. We sign a mutual NDA before files, and export-controlled drawings follow the process on controlled programs.

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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

Related

• What Drives Aerospace Lead Time and How to Shorten It
• Receiving Inspection: What Buyers Check and Why Parts Get Held
• Material Certs, Specialty Metals and Lot Traceability
• How Primes Score Supplier Delivery and Quality

Sources

• 15 CFR 700.14, Preferential scheduling (Cornell LII)
• 15 CFR 700.17, Use of rated orders (Cornell LII)
• 15 CFR 700.74, Violations, penalties, and remedies (Cornell LII)
• FAR 46.402, Government contract quality assurance at source (acquisition.gov)
• FAR 46.405, Subcontracts (acquisition.gov)
• SAE AS9102, Aerospace First Article Inspection Requirement
• Net-Inspect, AS9102 Rev B vs Rev C first article inspection changes