To balloon an engineering drawing, first confirm the drawing revision and inspection scope. Then choose a consistent review order, identify the requirements in scope, assign unique characteristic IDs, create matching report rows, and reconcile the drawing against the report before release. Customer and quality management system (QMS) requirements determine the required scope and format.

1. Confirm the part, drawing revision, sheets, and governing requirements.
2. Define what the inspection or first article inspection (FAI) must account for.
3. Choose and document a reading order and ID scheme.
4. Review dimensions, controls, notes, and other requirements by sheet or zone.
5. Assign each characteristic an unambiguous ID and leader target.
6. Build the corresponding report entry while you balloon.
7. Review global notes and title-block requirements separately.
8. Run a two-way drawing-to-report check and validate the revision.

Before you start: lock down the source

Record the part number, drawing number, revision, issue date if applicable, sheet count, units, customer, job or purchase order, and inspection type. Confirm that the PDF matches the controlled source. An old PDF in a shared folder can look perfectly usable and still invalidate the work.

Read the purchase order, customer quality clauses, supplier-quality manual, internal procedure, or other governing instructions that apply. Decide whether you are preparing a first article, a dimensional report, source inspection evidence, or another record. These processes may have different scope and fields.

Step 1: Choose a consistent reading order

A repeatable route makes review easier. Teams commonly work sheet by sheet, then zone by zone or view by view. Some use a top-left-to-bottom-right sweep; others follow a documented feature sequence. No one path should be treated as universal. Choose a method that fits the drawing and procedure, then record sheet or zone information so another person can find each callout.

Step 2: Identify requirements, not every visible number

Review explicit dimensions and tolerances, hole and thread callouts, geometric dimensioning and tolerancing (GD&T) feature-control frames, local finish symbols, requirement-bearing notes, and special characteristics identified by the customer. Separate acceptance requirements from reference information, view labels, scales, and document-control fields. A general tolerance note may govern many dimensions; it is not automatically a separate measured item for every feature.

Step 3: Assign an ID and place the balloon clearly

Choose a method such as continuous numbering or a sheet-aware ID format under your procedure. The ID must be unique in the relevant record set and clear enough to reconcile. Do not assume that numbers must be gap-free, start at 1, follow a clockwise path, or restart on each sheet unless a governing instruction says so.

Keep balloons near their callouts without covering text, dimensions, symbols, or other leaders. Point the leader to the intended requirement rather than to an ambiguous empty region. Add a sheet or zone reference when the report row could otherwise be hard to locate.

Step 4: Build the report row at the same time

For every ID, capture enough information to preserve traceability. Depending on the record, that may include the original callout, normalized requirement, nominal value, upper and lower tolerance, units, sheet or zone, verification method, actual result, status, and note or evidence reference. Preserve the drawing wording where it matters; normalization should not silently replace the source text.

Step 5: Treat compound callouts as linked requirements

One printed callout can contain several distinct pieces of information. For example, “4X Ø8.0 ±0.1 THRU” includes a quantity, feature size, tolerance, and depth condition. A positional feature-control frame may add geometric control and datum context. Whether the team records one characteristic with multiple results or several linked characteristics depends on the accountability procedure, measurement plan, and customer format.

Do not let a text extractor turn a compound callout into a bare number. Preserve the quantity, symbols, tolerance, and relationship to the feature. For threads, retain the size, pitch, class, depth, and quantity when shown and relevant.

Step 6: Review notes and global requirements separately

Read the title block and every note, including notes on additional sheets and referenced specifications. Decide which notes establish acceptance criteria, which govern other characteristics, and where evidence belongs. Material, heat treatment, plating, or special-process records may be controlled in certificates or other quality records rather than in the numeric dimensional table.

Step 7: Reconcile both directions

• Drawing to report: each in-scope characteristic has a matching report entry or documented evidence destination.
• Report to drawing: every row points to the correct source location, requirement, and revision.

Also check duplicate IDs, duplicate rows, missing sheets or zones, stale IDs after revision changes, unreadable balloons, ambiguous leaders, unresolved tolerance sources, and rows that have no source requirement. Resolve every uncertainty before release.

Printable-style review checklist

• ☐ Correct part, drawing revision, sheet count, and units recorded.
• ☐ Customer, contract, and internal inspection scope confirmed.
• ☐ Reading order and numbering scheme defined.
• ☐ Dimensions, patterns, threads, GD&T, local symbols, and notes reviewed.
• ☐ General tolerances traced to the characteristics they govern.
• ☐ Every ID is unique and every leader is unambiguous.
• ☐ Each intended characteristic has a corresponding record/evidence route.
• ☐ No report row points to a missing or superseded requirement.
• ☐ A second reviewer checks completeness and drawing/report consistency.

Manual vs. assisted ballooning

A manual process gives the reviewer direct control but includes marking, data entry, and reconciliation. An assisted process can propose candidate requirements and report fields, but it still needs evidence review and a manual recovery path. For example, BalloonForge lets a reviewer accept, reject, correct, merge, split, add, or rescan candidates, then edit balloon placement and validate exports. It does not prove that every in-scope characteristic was found.

Frequently asked questions

Where should balloon numbering start?

Use the customer or internal convention. Starting at 1 is common, but the important properties are unique, clear traceability and synchronized records.

Should repeated holes have separate IDs?

Quantity, size, and geometric control may be recorded together or split into linked records. Follow the accountability scheme and measurement plan; preserve the number of physical features and the evidence for each.

What happens when the drawing changes?

Compare revisions, identify new, changed, and deleted requirements, decide whether established IDs remain stable, and update the drawing and report as one controlled set.

Further reading

• What a ballooned drawing does
• IAQG 9102 FAI resources