How do you calculate an aerospace supplier risk score?

Multiply the three 1-10 ratings: severity, likelihood, and detection difficulty. The score then expresses relative priority — higher means escalate sooner. The example inputs of 9, 6, and 7 produce a normalized risk score of 7.45.

What is a good supplier risk score?

Lower is better. There's no universal cutoff, but you should rank all suppliers and focus mitigation on the top tier. A supplier scoring 7.45 with severity at 9 belongs in active mitigation, not passive monitoring.

Why use multiplication instead of an average?

Multiplication mirrors classic FMEA RPN logic: a high score in any one dimension — say severity 9 — keeps the overall risk elevated even if the other factors are moderate, which an average would wash out.

What does detection or recovery difficulty mean here?

It captures how hard it is to see a supplier problem coming and how hard it is to recover — through second sources, buffer stock, or re-qualification. A 7 means limited visibility and few quick recovery options.

How is this different from a financial supplier rating?

A financial rating looks at the supplier's solvency; this score looks at program impact. A financially healthy supplier can still score high if they're single-source on a flight-critical, long-lead part with low detectability.

How often should I rescore suppliers?

At every program risk review and whenever something changes — a quality escape, a financial signal, a capacity shift. Severity rarely changes, but likelihood and detection difficulty move as conditions evolve.

Aerospace & Defense Manufacturing calculator

Aerospace Supplier Risk Score Calculator

Aerospace Supplier Risk Score is a Risk Priority Number adapted for supply-chain risk on aerospace, defense, and space programs. It multiplies how badly a supplier failure would hurt the program, how likely that disruption is, and how hard it would be to detect or recover from — the same severity-occurrence-detection logic as an FMEA. Supply-chain and program-risk managers use it to rank suppliers objectively so attention and mitigation dollars flow to the threats that can actually ground a build or slip a milestone. It matters because aerospace programs live or die on single-source, long-lead, flight-critical hardware where one supplier stumble cascades for months.

What this calculator does

Score aerospace supplier risk using program impact, disruption likelihood, and difficulty detecting supplier issues early.
a supplier quality or procurement lead needs to rank supplier risk for flight hardware, materials, or special processes
It computes a multiplicative risk priority score from program impact severity, supplier disruption likelihood, and detection or recovery difficulty.

Formula used

Aerospace supplier risk score = severity score × likelihood score × detection difficulty score
Higher scores identify aerospace, defense, or space manufacturing risks that should be escalated before release, shipment, or program commitment.

Inputs explained

Program impact severity:
Supplier disruption likelihood:
Detection or recovery difficulty:

How to use the result

Use it during supplier qualification, source selection, or periodic program risk reviews to rank which suppliers warrant escalation.
It is a relative prioritization tool, not an absolute probability — a high score flags attention but doesn't quantify dollar exposure or schedule slip on its own.

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 an aerospace supplier risk score? Multiply the three 1-10 ratings: severity, likelihood, and detection difficulty. The score then expresses relative priority — higher means escalate sooner. The example inputs of 9, 6, and 7 produce a normalized risk score of 7.45.
What is a good supplier risk score? Lower is better. There's no universal cutoff, but you should rank all suppliers and focus mitigation on the top tier. A supplier scoring 7.45 with severity at 9 belongs in active mitigation, not passive monitoring.
Why use multiplication instead of an average? Multiplication mirrors classic FMEA RPN logic: a high score in any one dimension — say severity 9 — keeps the overall risk elevated even if the other factors are moderate, which an average would wash out.
What does detection or recovery difficulty mean here? It captures how hard it is to see a supplier problem coming and how hard it is to recover — through second sources, buffer stock, or re-qualification. A 7 means limited visibility and few quick recovery options.
How is this different from a financial supplier rating? A financial rating looks at the supplier's solvency; this score looks at program impact. A financially healthy supplier can still score high if they're single-source on a flight-critical, long-lead part with low detectability.

Last reviewed 2026-05-12.