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A program can pass every development milestone and still stumble at production. The hardware worked when engineers built it by hand; the question now is whether a production line, a supply chain and a workforce can build it the same way every time, at rate, at cost. Transition to production is where that question is answered.
What has to be ready at the same time
A producible design. Tolerances that can be held with production processes, features that can be inspected, and a configuration stable enough that the line is not chasing changes.
Proven processes. Manufacturing and special processes demonstrated on production equipment, by production staff, with documented work instructions rather than engineering knowledge.
A supply chain qualified for rate. Suppliers who have completed first article inspection, with capacity for production quantities and lead times the schedule can absorb.
A quality system that fits the product. Inspection points, acceptance tests and nonconformance handling defined for production, not borrowed from development.
A trained workforce and facilities. People, tooling and space in place, with the learning curve planned rather than hoped for.
Measuring readiness
Defense programs commonly use manufacturing readiness levels to structure the assessment. The levels run from 1 to 10 and look at risk across areas including technology and industrial base, design, cost, materials, process capability, quality, workforce, facilities and management. Acquisition guidance generally expects a demonstrated pilot line, level 8, before low rate initial production, and level 9 before full rate. Commercial aerospace programs reach the same questions through production readiness reviews and the AS9145 APQP and PPAP process.
The value of the assessment is not the number. It is the list of specific gaps it produces, each of which can be owned, scheduled and closed before production starts to depend on it.
Where transitions go wrong
Design frozen before it was producible. Manufacturing engineering brought in after the design review has to live with decisions it would have changed.
Suppliers proven on prototypes. A supplier that delivered six good parts in development may not deliver sixty a month. Rate capacity and lead time need their own evidence.
Knowledge in people, not documents. When the build depends on two engineers who know the tricks, the program has a single point of failure the schedule does not show.
Tooling and test equipment treated as an afterthought. Production fixtures, gauges and acceptance test stations often have lead times as long as the flight hardware. When they are ordered late, the line waits for them, however ready everything else is.
No plan for the learning curve. Early production units take longer and cost more. A schedule and budget that assume steady state from unit one will slip from unit one.
Treat low rate production as a learning phase
Low rate initial production exists for a reason. It is the first time the product is built repeatedly by the people and equipment that will build it for years, and it should be run to learn as much as possible. That means capturing every nonconformance and its cause, timing real build hours against the plan, and feeding design and process fixes back before rate increases. Programs that treat the first production lots as simply late deliveries tend to carry their problems into full rate, where every defect is multiplied.
A short rate readiness check for each critical supplier
- First article complete and accepted on the current revision.
- Demonstrated capacity for the planned monthly quantity, not only a stated one.
- Lead times for raw material and special processes known and inside the schedule.
- Second sources identified for single points of failure, or a documented reason why not.
- Quality performance tracked, with a named contact for escalation.
What are the manufacturing readiness levels?
| Level | Definition in brief |
|---|---|
| 1 | Basic manufacturing implications identified |
| 2 | Manufacturing concepts identified |
| 3 | Manufacturing proof of concept developed |
| 4 | Capability to produce the technology in a laboratory environment |
| 5 | Capability to produce prototype components in a production-relevant environment |
| 6 | Capability to produce a prototype system or subsystem in a production-relevant environment |
| 7 | Capability to produce systems, subsystems or components in a production-representative environment |
| 8 | Pilot line capability demonstrated; ready to begin low rate initial production |
| 9 | Low rate production demonstrated; capability in place for full rate production |
| 10 | Full rate production demonstrated with lean practices in place |
What happens at a production readiness review?
A production readiness review examines whether the design, processes, supply chain, facilities, tooling, workforce and quality system are ready to support production at the planned rate and cost. It brings together the manufacturing readiness evidence, open risks and the plan to close them. The review is most useful when it is treated as a decision point with real criteria, not a presentation: the outcome should be a clear decision to proceed, proceed with conditions, or fix specific gaps first.
Where does design for manufacturability fit?
As early as possible, and certainly before the design is frozen. Manufacturing engineers reviewing drawings during development can flag tolerances that production processes cannot hold economically, features that cannot be inspected, assemblies that need special tooling and materials with long or fragile supply. Each of those is a small drawing change during design and an expensive engineering change once production has started. Programs that bring manufacturing into design reviews reach production readiness faster and with fewer surprises.
Which metrics show a program is ready for rate?
| Metric | What it reveals |
|---|---|
| First-pass yield by operation | Whether processes are capable, or rely on rework |
| Actual build hours versus plan, by unit | Whether the learning curve is on track |
| Open engineering changes affecting production | Whether the design is stable enough for rate |
| Supplier on-time delivery for critical parts | Whether the supply chain can support the rate |
| Open manufacturing readiness risks | What still stands between the program and the next production decision |
How do low rate and full rate production decisions work on defense programs?
They are two separate decisions, and each one needs its own evidence. Under DoD Instruction 5000.85, Milestone C is the decision to enter production and deployment, and on most major programs it authorizes low rate initial production. A full rate production decision comes later. For major defense acquisition programs, federal law generally does not allow a program to go beyond low rate production until initial operational test and evaluation is complete. Low rate quantities are meant to be the minimum needed to provide production-representative units for operational test, establish an initial production base and allow an orderly increase to full rate.
| Decision | What it commits the program to | Evidence it usually rests on |
|---|---|---|
| Milestone C, production decision | Low rate initial production and the start of the production base | A stable design, developmental test results, a demonstrated pilot line at manufacturing readiness level 8 and a production readiness review |
| Full rate production decision | Production at the planned rate and quantity | Operational test results, actual performance of the low rate lots and manufacturing readiness level 9 |
| Commercial aerospace equivalent | Series production and customer deliveries | Type design approval, an FAA production approval under 14 CFR Part 21, customer first article acceptance and, where required, AS9145 production part approval |
For a supplier or subcontractor, the prime's decision dates set your dates. Your first article, rate qualification and long-lead material need to be finished before the prime's production decision, not after it, because the low rate lots will be built from your parts.
How do you plan for the learning curve?
Put a learning curve in the schedule and the budget, set from comparable history wherever you have it, instead of assuming steady-state hours from the first unit. T. P. Wright first described the effect in 1936 using airframe data: each time cumulative quantity doubles, the labor per unit falls to a fixed percentage of what it was. The GAO Cost Estimating and Assessment Guide explains the two common forms, unit theory and cumulative average theory, and how to choose between them. The table shows unit theory on an 80 percent curve with a first unit of 1,000 hours.
| Unit number | Hours for that unit | Reduction from unit 1 |
|---|---|---|
| 1 | 1,000 | None |
| 2 | 800 | 20 percent |
| 4 | 640 | 36 percent |
| 8 | 512 | 49 percent |
| 16 | 410 | 59 percent |
| 32 | 328 | 67 percent |
Three practical points follow. First, the slope matters more than the first-unit estimate, so base it on the history of similar products and processes rather than a textbook figure. Second, track actual hours per unit against the curve from the first production unit. A curve that flattens early usually points to process instability, rework or engineering changes reaching the line, not slow learners. Third, plan for lost learning. Gaps in production, line moves and workforce turnover push hours back up the curve, and a schedule that ignores them will slip at exactly the moment rate is supposed to increase.
What should a production readiness plan contain?
A set of workstreams, each with an owner, a date and specific exit evidence, carried as real tasks in the integrated master schedule and linked to the production decision. When readiness lives in a separate checklist, a late gauge or an untrained operator is invisible until the line stops. When it lives in the schedule, it shows up as a critical path risk weeks earlier.
| Workstream | Exit evidence before rate |
|---|---|
| Design | Drawings released at the production revision, with open changes that affect production closed or formally dispositioned |
| Processes | Special processes qualified, work instructions released and capability shown on key characteristics |
| Supply chain | First articles accepted, rate capacity demonstrated and long-lead material on order |
| Tooling and test equipment | Production fixtures, gauges and acceptance test stations built, calibrated and validated |
| Quality | Inspection plans, acceptance test procedures and a working nonconformance and corrective action flow |
| Workforce | Operators trained, and certified where special processes require it, with a plan for backup coverage |
| Facilities | Floor space, utilities, capacity and any environmental or safety approvals in place |
Set Boundaries treats a development program as complete only when milestone payments have been achieved and production deliveries have started, so readiness is part of the job, not a handoff. We also support recovery of programs already in production when the problem needs significant engineering work, in effect a small development program inside production, rather than routine supply chain or obsolescence management. For moving an existing line between sites, see manufacturing transition, and for suppliers who are not ready for rate, see supplier recovery.
Who should lead the transition to production?
One person with authority across engineering, manufacturing, supply chain and quality, usually for a defined period spanning the last development milestones and the first production lots. Without that owner, each function prepares its own part of production readiness and the gaps between them are discovered on the shop floor. A transition lead runs the readiness plan like any other critical path: owners, dates, weekly review, and a clear decision at the production readiness review.
Related guides
- First article inspection under AS9102
- AS9145 APQP and PPAP
- Configuration management through closeout
- Aerospace and defense project closeout
How Set Boundaries helps
Set Boundaries treats transition to production as a program in its own right: assessing readiness across design, processes, suppliers, quality and workforce, turning the gaps into a schedule with owners, driving supplier first articles and rate qualification, and preparing for the production readiness review. It follows naturally from closing out development, and on additive manufacturing programs it is often where most of the risk sits.
If a program is heading into production and the readiness picture is unclear, schedule a call.
References
- US Department of Defense, DoD Instruction 5000.85, Major Capability Acquisition.
- US Department of Defense, Manufacturing Readiness Level (MRL) Deskbook.
- US Government Accountability Office, Cost Estimating and Assessment Guide, GAO-20-195G.
- T. P. Wright, "Factors Affecting the Cost of Airplanes," Journal of the Aeronautical Sciences, 1936.
- 14 CFR Part 21, Certification Procedures for Products and Articles.
- SAE International, AS9145, Requirements for Advanced Product Quality Planning and Production Part Approval Process, and AS9102, Aerospace First Article Inspection Requirement.
Questions
Common questions
What does transition to production mean?
It is the move from building a product in development, often by engineers in small numbers, to building it repeatedly at rate in a production environment. It covers the design, the manufacturing processes, the supply chain, the workforce and the quality system, all of which have to be ready at the same time.
How do you know a program is ready for production?
Many defense programs use manufacturing readiness levels, which assess risk across areas such as design maturity, materials, processes, quality, workforce, facilities and supply chain. A production readiness review brings that evidence together before the commitment to rate production is made.
What is a manufacturing readiness level?
A manufacturing readiness level, or MRL, is a measure from 1 to 10 of how mature the manufacturing capability for a product is. Defense acquisition guidance generally looks for level 8, a pilot line demonstrated, before low rate initial production, and level 9 before full rate production.
Why do transitions to production fail?
Usually because the design was finished before it was producible, suppliers were qualified on prototype quantities rather than rate, or the knowledge needed to build the product lived with a few engineers rather than in documented processes. Each of these is visible early if someone looks for it.
What is low rate initial production?
Low rate initial production, often called LRIP, is the first phase of production on many defense programs, building a limited quantity to prove the manufacturing process, provide units for operational testing and establish an initial production base before committing to full rate. It is best run as a learning phase, capturing every nonconformance and real build hour to improve the process before rate increases.
What is a production readiness review?
A production readiness review assesses whether a program is ready to produce at the planned rate and cost, covering design stability, manufacturing processes, supply chain, facilities, tooling, workforce and quality. It combines manufacturing readiness evidence with open risks and plans to close them, and should end in a clear decision: proceed, proceed with conditions, or resolve specific gaps first.
How do you go from prototype to production?
Going from prototype to production means proving that a design built by engineers can be built the same way every time by a production line. The usual steps are to stabilize the design for producibility, prove manufacturing and special processes on production equipment, qualify suppliers for rate, complete first article inspection, write work instructions and train the workforce, then run a low rate phase before full rate. Readiness reviews check each step. Set Boundaries helps aerospace and defense programs plan this transition early, rather than discovering gaps once production starts.
What is aerospace production?
Aerospace production is the repeatable manufacture of aircraft, spacecraft, missiles and their components under controlled, certified processes, as opposed to one-off development builds. It depends on a stable configuration, qualified suppliers, special processes such as heat treatment and nondestructive testing, first article inspection, and a quality system typically certified to AS9100. Production rates are usually lower and traceability demands higher than in many other industries. Set Boundaries helps programs move from development into production so the line, suppliers and paperwork are ready together.
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