How do you calculate aerospace inspection burden?

Divide characteristics by your verification pace to get base measurement time, then multiply by (1 + allowance). For 320 characteristics at 4.8 per minute with a 30% allowance, that is 66.67 hr base, scaled to 86.67 inspection hr.

What counts as an inspection characteristic?

Every ballooned dimension, GD&T callout, note, and material or finish requirement on the released drawing that must be verified and recorded, typically on the AS9102 Form 3.

Why add a documentation allowance?

AS9100 requires recording results, setup, fixturing, and re-verification. The 30% allowance in the example adds 20 hours of documentation and setup on top of the 66.67 hours of pure measurement.

What is a typical inspection verification pace?

It varies from under 1 characteristic per minute for complex CMM true-position work to several per minute for simple gauge checks. The 4.8 per minute default reflects a mix skewed toward quick hand-gauge dimensions.

How is this different from machining cycle time?

Cycle time measures the spindle; inspection burden measures metrology labor. On heavily ballooned aerospace parts the inspection hours can rival or exceed machining hours, which is why they are planned separately.

How can I reduce inspection burden?

Reduce the characteristic count through drawing simplification, automate with CMM and vision systems to raise the pace, and use sampling plans where the contract allows instead of 100% verification on every lot.

Aerospace & Defense Manufacturing calculator

Aerospace Inspection Burden Calculator

Aerospace inspection burden is the total labor time to verify all the inspection characteristics on a part, including the documentation and setup overhead that AS9100 and first-article (AS9102) work demand. Quality managers and capacity planners use it to staff the inspection cell, quote inspection cost, and avoid the bottleneck that bunched-up FAIRs create. A drawing with hundreds of ballooned characteristics can quietly consume more clock time in metrology than the part spent on the machine. Modeling it up front keeps CMM queues and inspector workload realistic.

What this calculator does

Estimate inspection hours for aerospace parts from inspection characteristics, inspection pace, and added AS9100 review allowance.
a quality engineer needs to estimate inspection labor for precision machined aerospace components or flight assemblies
It converts a characteristic count and a verification pace into base measurement hours, then adds a percentage allowance for documentation and setup.

Formula used

Base measurement time = inspection characteristics ÷ inspection verification pace
Total inspection burden = base measurement time × (1 + documentation and setup allowance)

Inputs explained

Inspection characteristics to verify:
Inspection verification pace:
AS9100 documentation review allowance:

How to use the result

Use it when planning first-article inspection, quoting inspection labor, or sizing the metrology cell for a new aerospace program.
It assumes a steady average pace across all characteristics; in reality GD&T callouts, true-position checks, and CMM program runs vary widely, so use weighted paces for mixed-difficulty parts.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate aerospace inspection burden? Divide characteristics by your verification pace to get base measurement time, then multiply by (1 + allowance). For 320 characteristics at 4.8 per minute with a 30% allowance, that is 66.67 hr base, scaled to 86.67 inspection hr.
What counts as an inspection characteristic? Every ballooned dimension, GD&T callout, note, and material or finish requirement on the released drawing that must be verified and recorded, typically on the AS9102 Form 3.
Why add a documentation allowance? AS9100 requires recording results, setup, fixturing, and re-verification. The 30% allowance in the example adds 20 hours of documentation and setup on top of the 66.67 hours of pure measurement.
What is a typical inspection verification pace? It varies from under 1 characteristic per minute for complex CMM true-position work to several per minute for simple gauge checks. The 4.8 per minute default reflects a mix skewed toward quick hand-gauge dimensions.
How is this different from machining cycle time? Cycle time measures the spindle; inspection burden measures metrology labor. On heavily ballooned aerospace parts the inspection hours can rival or exceed machining hours, which is why they are planned separately.

Last reviewed 2026-05-12.