The APQP quality loop: four interconnected tools
In the APQP (Advanced Product Quality Planning) framework, four quality tools are tightly linked to the technical drawing and its ballooned characteristics:
- PFMEA (Process Failure Mode & Effects Analysis) — identify non-conformance risks
- MSA (Measurement System Analysis) — validate measurement reliability
- SPC (Statistical Process Control) — monitor process stability
- Control Plan — orchestrate production controls
The ballooned drawing is the connecting thread: each balloon number is a characteristic traced from FMEA to the inspection station. For full APQP context, see ppap-fai.approche-qualite.fr.
1. PFMEA and the ballooned drawing
Each ballooned characteristic is a potential "affected product characteristic" in the PFMEA. Critical (CC) and significant (SC) characteristics identified in the PFMEA are flagged on the drawing with special symbols and ballooned as a priority. The balloon number allows immediate cross-referencing between the PFMEA and the control characteristic.
2. MSA — Measurement System Analysis
Each measurement device used to measure a balloon must have an MSA study (Gauge R&R). Form 3 records the measurement device per balloon — directly verifiable against MSA records. AIAG MSA 4th edition criteria: R&R < 10% = acceptable; 10–30% = marginal; ≥ 30% = not capable, corrective action required.
3. SPC — Statistical Process Control
CC/SC balloons from PFMEA are prioritised for SPC. The balloon's tolerance (from Form 3) defines LSL/USL specification limits, from which LCL/UCL control limits are derived. Cpk ≥ 1.33 (PPAP) or Ppk ≥ 1.67 (Run@Rate) is required for special characteristics.
4. Control Plan
The Control Plan references each characteristic by balloon number, with its specification and tolerance from Form 3, measurement method (MSA-validated), inspection frequency, and reaction plan. The balloon number is the join key between drawing, Form 3, PFMEA, and Control Plan.
BullePlan: the starting point of the entire quality loop
A complete ballooned drawing and structured Form 3 from BullePlan provide the documentary foundation for PFMEA (exhaustive characteristic list), MSA (measurement devices per balloon), SPC (specification limits), and Control Plan (characteristics, tolerances, devices). Export your Form 3 from BullePlan → feed it into your Control Plan → your APQP loop is complete and traceable from drawing to inspection station.