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Lean playbook · Aerospace and defense

Lean playbook for aerospace and defense plants

Short answer

Start lean in an aerospace plant on one cell or assembly line, with losses you can count. Good ones are FOD findings, days that nonconformances wait for MRB, first pass yield and hours per unit against the learning curve. Clean-as-you-go and tool control prevent FOD. A fixed MRB rhythm clears the backlog, and standard work with job instruction brings hours per unit down. Change nothing under a frozen process, a first article or a customer approval without going through your quality system first.

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7 problems on the floor, and the lean methods for each

Each problem says what it looks like, which methods address it, the first moves to make and the number to watch. Pick the one or two that cost your plant most; you do not need all of them at once.

Where an aerospace build from detail parts to buy-off loses time and quality

  1. Detail parts: machining, sheet metal and composites

  2. Special processes: heat treat, NDT and coating

  3. Sub-assembly

  4. Final assembly and systems install

  5. Test, first article and buy-off

Across the whole line

A simplified line, not a plant layout. Select a number to jump to that problem.

  1. Foreign object debris

    Rivets, swarf, safety wire, caps and lost tools end up in assemblies, ducts and engine areas. FOD is found at inspection or, worse, in service, and the source is hard to trace once the area has moved on to the next unit.

    Lean methods

    In LeanSuite

    Build the FOD walk in Lean Creator, or let the AI draft it, and schedule it in Daily Standard Work to a person, a role or a machine, with a repeat rule.

    First moves

    1. Name the FOD-critical areas, mark their boundaries and post the rules at each entrance.
    2. Clean as you go: a sweep and a check at the end of each task and each shift, not only before inspection.
    3. Run a short FOD walk in each area every shift and photograph what is found.
    4. Trend findings by type and area, and fix the source of the top one each month.

    Number to watch: FOD findings per walk by type and area, and FOD found at inspection or by the customer.

    5S audit checklist templateShadow board plannerFloor marking color guideVisual management audit checklist

  2. First article inspection (AS9102)

    A new part number, a design change, a new source, process, location or tooling, or a long lapse in production calls for a first article inspection. Every characteristic on the drawing is ballooned and measured, and material and special process certifications are checked. The part waits while it is done, and one missed characteristic sends it back.

    Lean methods

    In LeanSuite

    Build the first article check in Lean Creator as a checklist with number limits, required photos and signatures.

    First moves

    1. Balloon the drawing first and number every characteristic, including notes, finishes and materials.
    2. Plan who measures what, and with which gauge, before the part is made, so the inspection does not wait for a gauge.
    3. Check material and special process certifications against the drawing as they arrive, not at the end.
    4. For a partial first article after a change, list the characteristics the change affects and inspect those.

    Number to watch: First article pass rate first time, and days from first part made to first article accepted.

    First article inspection (FAI) report templateGauge calibration logMSA study workbookProcess capability (Cp, Cpk) calculator

  3. Nonconformances waiting for MRB

    A nonconforming part is tagged and moved to the MRB area, where it waits for quality, engineering and sometimes the customer to agree a disposition: use as is, rework, repair or scrap. When the board meets irregularly, parts wait for days, and the same nonconformance returns on the next lot.

    Lean methods

    In LeanSuite

    Each non-conformance is captured with photos and routed to quality and engineering.

    First moves

    1. Hold a short MRB meeting at a fixed time, daily or several times a week, with quality and engineering present.
    2. Contain first: segregate, count and check work in progress and stock before looking for the cause.
    3. Record each disposition with its reason, and send repeat nonconformances to a corrective action, not just another disposition.
    4. Track every open NCR by age, and review the oldest at each meeting.

    Number to watch: MRB cycle time, from NCR raised to disposition, and repeat NCRs per part number.

    Non-conformance report (NCR) form8D report templateCAPA log templateQuality alert form

  4. Missed steps on long travelers

    A traveler can run to hundreds of operations, inspection points and stamps. Steps are missed, done out of order or stamped later from memory, and work instructions drift from the drawing after an engineering change.

    Lean methods

    In LeanSuite

    Film the job once and LeanSuite drafts the work instruction with numbered steps, photos, tools, PPE and warnings from the video.

    First moves

    1. Split long operations into short steps with a clear end point, so a stopped job restarts in the right place.
    2. Put key points, torque values and inspection holds in the instruction itself, where the mechanic reads them.
    3. Update the instruction in the same change as the drawing, and brief the people who do the work.
    4. Check a sample of open travelers each shift with a short layered audit.

    Number to watch: Traveler errors found at inspection or audit, per unit.

    Manufacturing process instruction (MPI) templateLayered process audit (LPA) checklistEngineering change request (ECR) formStandard work sheet template

  5. Tool control and shadow boards

    Every tool taken to the assembly has to come back before the job closes, and a missing one can stop work until it is found. Shadow boards, tool checks at shift start and end and calibration dates only work if the check is done every time.

    Lean methods

    In LeanSuite

    Schedule tool checks at the start and end of every shift as checklists with pictures and videos for each step.

    First moves

    1. Give each tool a place on a shadow board or a foam tray, with an ID on the tool.
    2. Check the board at the start and end of each shift and each job, and sign it off.
    3. Treat a missing tool as a stop: search before the area is closed up or the unit moves.
    4. Keep calibration due dates on the tool and on one list, and pull overdue tools from use.

    Number to watch: Tool checks done on time, and missing-tool events per month.

    Shadow board plannerGauge calibration log5S audit checklist template

  6. Hours per unit above the learning curve

    Each unit takes hundreds of labor hours and only a few are built each month, so people rarely repeat a job often enough to settle the best method. Hours per unit fall more slowly than the bid assumed, and no one can see which steps lose the time.

    Lean methods

    In LeanSuite

    Film the process on a phone and LeanSuite times every element, splits value-added from waste and links each figure to its video frame.

    First moves

    1. Plot actual hours per unit against the learning curve used in the bid, unit by unit.
    2. Time study the steps with the biggest gap, ideally from video, so the method can be watched again.
    3. Write the best method down as standard work and train it with job instruction before the next unit.
    4. Rebalance the work between stations or shifts when the build rate changes.

    Number to watch: Hours per unit against the learning curve, by unit number.

    Learning curve and ramp-up workbookTime study sheetStandard work combination tableTWI job breakdown sheetTime study sample size calculatorLine balancing calculator

  7. Work held by a few certified people

    Special processes, NDT, wiring, sealing and torque-critical tasks are limited to people with current certifications or stamps. When a certified mechanic or inspector is out, the job waits, and certificates that have lapsed are found at audit.

    Lean methods

    In LeanSuite

    Competency Management keeps a live skills matrix whose levels update as people complete training and on-the-job sign-offs.

    First moves

    1. List the tasks that need a certification or stamp and who holds each one, with expiry dates, by shift.
    2. Mark the tasks with fewer than two current holders per shift and plan training for those first.
    3. Pair trainees with certified people on real units and sign them off on the job.
    4. Put renewals on a calendar a few months before each certificate expires.

    Number to watch: Tasks with at least two people holding a current certification on every shift.

    Skills matrix templateTraining matrix template with expiry datesCross-training plan templateCompetency assessment form

More small fixes in the production, quality and safety sections of the kaizen idea bank.

A 90-day starting plan

One line or product family, two problems, measured before and after. The point of the first 90 days is a result the plant believes and a method it can repeat, not a plant-wide program.

The 90 days, with the gate that ends each stage

  1. Days 1 to 30See the losses on one cell or lineDone when: You have baseline numbers on the board and two problems with an owner each.
  2. Days 31 to 60Fix the top two lossesDone when: Each fix has a written standard and a before-and-after number.
  3. Days 61 to 90Make it stick, then spread itDone when: The gains have held for a month and the next cell or line has its baseline.
Move to the next stage only when the gate is met, even if a stage runs past its 30 days. The cards below say what to do inside each stage.

  1. Days 1 to 30

    See the losses on one cell or line

    Pick one cell or assembly line and get a true baseline before changing anything.

    • Choose one cell or assembly line, and name a lead and a sponsor.
    • Measure for two weeks: FOD findings, open NCRs and their age, first pass yield, traveler errors and hours per unit against the learning curve.
    • Start a 15-minute meeting at the area board at the start of each shift.
    • Check the skills matrix: which certified tasks have fewer than two people per shift.
    • Choose the two biggest losses to work on first.

  2. Days 31 to 60

    Fix the top two losses

    Run focused improvements on the two problems and check them against the baseline.

    • Start the shift FOD walk and the tool checks, and photograph every finding.
    • Set a fixed MRB rhythm and work the oldest NCRs first.
    • Time study the steps with the biggest gap to the learning curve and write the best method down as standard work.
    • Bring quality into each change, so nothing under a frozen process or a first article changes without approval.

  3. Days 61 to 90

    Make it stick, then spread it

    Check the new standards hold on every shift, then copy them to the next cell or line.

    • Audit the new standards on every shift with short layered audits.
    • Train and sign off mechanics on the changes, and close the certification gaps found in days 1 to 30.
    • Compare the area's numbers with the baseline and share the result with the plant.
    • Pick the next cell or line, copy what worked and start again at day one.

The KPIs to track

Track them per line and shift, on a board the team sees every day. Set targets from your own baseline, not from someone else's plant.

KPIs for aerospace and defense plants: what each tells you and how to measure it
KPIWhat it tells youHow to measure itFree help
First pass yieldThe share of units or operations accepted at inspection the first time.Units accepted first time divided by units inspected, per operation or per unit.First pass yield (FPY) calculator
EscapesDefects that got past your inspection and were found by the customer or in service.Nonconformances reported by the customer each month, against the units delivered that month.8D report template
FOD incidentsWhether FOD prevention works where it matters, not just on the walks.FOD found at inspection, test or by the customer each month, shown beside the walk findings.Visual management audit checklist
MRB cycle timeHow long nonconforming parts wait for a decision.Days from NCR raised to disposition, as an average and as the age of the oldest open NCR.Non-conformance report (NCR) form
Hours per unit against the learning curveWhether labor hours fall as fast as the plan assumed.Actual hours for each unit divided by the hours the learning curve gives for that unit number.Learning curve and ramp-up workbook
On-time deliveryWhether the losses above reach the customer as late units.Units or orders delivered by the contract date divided by those due, per month.-
Certified coverageWhether every certified task can be staffed on every shift.Tasks with at least two people holding a current certification per shift, from the skills matrix.Skills matrix template

By the numbers

Public figures for this industry or for the wider sector it belongs to, each linked to the report or government table it comes from and checked against it on October 3, 2026. More in our lean manufacturing statistics and benchmark charts.

Injury and illness rate by industry, 2024

  1. Motor vehicles5.6
  2. Beverage and tobacco3.7
  3. Furniture3.5
  4. Food3.3
  5. Primary metals3.3
  6. Nonmetallic mineral products, incl. glass3.3
  7. Fabricated metal products3.2
  8. Transportation equipment3.2This industry
  9. Motor vehicle parts2.9
  10. Plastics and rubber products2.8
  11. HVAC and refrigeration2.4
  12. Paper2.4
  13. Machinery2.3
  14. All private industry2.3
  15. Electrical equipment and appliances2.0
  16. Printing1.6
  17. Chemicals1.6

Total recordable cases per 100 full-time workers, 2024: Motor vehicles 5.6, Beverage and tobacco 3.7, Furniture 3.5, Food 3.3, Primary metals 3.3, Nonmetallic mineral products, incl. glass 3.3, Fabricated metal products 3.2, Transportation equipment 3.2, Motor vehicle parts 2.9, Plastics and rubber products 2.8, All manufacturing 2.7, HVAC and refrigeration 2.4, Paper 2.4, Machinery 2.3, All private industry 2.3, Electrical equipment and appliances 2, Printing 1.6, Chemicals 1.6.

Total recordable cases per 100 full-time workers, U.S., 2024 data, from the BLS Survey of Occupational Injuries and Illnesses. This industry's rows are in yellow; the dark mark on each bar is all manufacturing, at 2.7.

Free templates, calculators and buyer's guides

Templates (23)

Calculators (4)

Buyer's guides

LeanSuite pages for these problems

How LeanSuite handles each of these is on the page for aerospace and defense plants.

Whirlpool tackled project visibility and continuous improvement across 14 manufacturing plants with LeanSuite. Read the Whirlpool case study.

FAQ

Lean in aerospace and defense plants: common questions

  1. On one cell or assembly line, with a loss you can count: FOD findings, NCRs waiting for MRB, first pass yield or hours per unit against the learning curve. Measure it for two weeks, fix the biggest cause with the people doing the work, write the method down and only then move on.

  2. A full, documented check that the production process makes a part to every requirement on the drawing and the purchase order. AS9102 sets out the record in three forms: part number accountability; product accountability for materials, special processes and functional tests; and characteristic accountability, where every ballooned characteristic is listed with its result. A partial first article covers only what a change affects. If a characteristic fails, the first article stays open until the cause is fixed and that characteristic is checked again.

  3. Illustrative example: on an 80% curve, the hours for a unit fall to 80% each time the number of units built doubles. If unit 1 took 1,000 hours, the plan is 800 hours for unit 2, 640 for unit 4 and 512 for unit 8 (1,000 times 0.8 times 0.8 times 0.8). If unit 8 actually took 600 hours, it is 88 hours, or about 17%, above the curve, because 88 divided by 512 is 0.172. That gap is where to time study the job: the steps that did not get faster are the ones to standardize and train.

  4. 5S, shadow boards and clean-as-you-go for FOD and tool control, standard work and job instruction for long manual builds, time study against the learning curve, a skills matrix for certified tasks, and root cause analysis with 8D for nonconformances and escapes. AS9145 brings APQP and PPAP to new parts, and lean work should feed into it, not run beside it.

  5. It should not, but many aerospace processes are frozen by a first article, a special process approval or a customer requirement. Any change to those goes through your quality system and, where needed, customer approval before it is made. Lean removes waiting, searching and rework around the controlled steps; it does not skip them.

See LeanSuite on your FOD walks and nonconformances

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