Power supply qualification
Power supply equipment qualification certification support
This review checks whether power supply equipment's qualification evidence actually covers the requirements it is cited against. A certification specialist reads the electrical load, power quality, thermal, and DO-160G data alongside the test article definition, then confirms each result was produced on the right hardware, under the defined conditions, to close the right requirement. It is used when a supplier is compiling qualification evidence and wants an independent read before it feeds a TSO or an installation STC. You receive a coverage assessment, a list of requirements not yet backed by valid evidence, and a defined route to close them.
When this review is needed
- A power supply qualification campaign has finished and the supplier wants the electrical, thermal, and environmental data reviewed before it anchors a claim.
- A component change forced a partial requalification and it is unclear which prior thermal or power quality results still apply.
- Power quality and thermal data came from different setups whose conditions and criteria may not agree.
- The team is choosing between defending an existing thermal margin and rerunning it, and needs an honest coverage picture first.
The problem
Power supply qualification spans electrical, thermal, and environmental domains that are usually tested on different rigs and often at different points in the design's life. The shipping unit may carry a component change made after the earliest thermal survey, and the power quality captures may have used conditions that do not match the standard's defined cases. Collected into a package, the data can look complete while the mismatch between what was tested and what the design now needs sits unexamined.
What gets reviewed
- Electrical load and output characterization checked against the parameters the design must claim
- Power quality behavior across the standard's defined input cases
- Thermal survey coverage and derating against the intended operating envelope
- DO-160G environmental categories mapped to the equipment's operating envelope
- Test article configuration compared across the electrical, thermal, and environmental campaigns
- A trace from each power supply requirement to a report run on the component standard that ships
Scope this review
Tell us the asset, the event, and the evidence in scope, and we will outline a focused first engagement.
Identify what is missing against the means of compliance.
What gets validated
- The article tested for thermal performance matches the standard tested for power quality and environmental effects
- Power quality results exercise the standard's abnormal-input cases, not only nominal input
- Thermal derating results cover the design's full operating and ambient envelope
- Results predating a component change are either still valid or explicitly superseded
- No requirement is marked qualified on a test that examined a different parameter
Evidence normally required
- The equipment requirement set and intended electrical, thermal, and environmental envelope
- Load and output characterization results for the power supply
- Power quality captures taken across undervoltage, overvoltage, and transient input
- The thermal survey with its derating substantiation
- Component-standard and change records for the units used in each campaign
Common discrepancies
- A thermal survey and a power quality capture run on units at different component standards
- Power quality exercised only at nominal input, leaving the standard's abnormal cases untested
- Thermal derating that does not cover the top of the design's ambient envelope
- House-default pass criteria in a report that do not match the equipment's actual requirement
What is at stake
A qualification gap that reaches a certification package surfaces when a thermal or power quality finding is traced back and the article or the condition does not hold. Recovery means rebuilding a thermal or electrical setup and rerunning conditions, which slips the program by a test cycle rather than the review cycle it would have taken to find the gap while the evidence was still being assembled.
How the work runs
Define the envelope
Write down the electrical, thermal, and environmental envelope the equipment must meet so coverage can be judged concretely.
Reconcile the articles
Confirm the units tested across the electrical, thermal, and environmental campaigns share one component standard.
Check cases and derating
Match power quality captures to the standard's abnormal cases and thermal results to the full ambient envelope.
Route the closures
Separate the gaps that need a retest from those needing re-analysis or a documentation fix.
What the buyer receives
- A coverage assessment mapping each electrical, power quality, thermal, and DO-160G requirement to a valid report
- A schedule of power supply requirements the qualification evidence leaves open, each with its reason
- A closure route grouping the open items into retest, re-analysis, and record correction
Who uses the output
- Supplier certification engineers assembling the qualification basis
- Thermal and electrical test engineers deciding what still needs to run
- Program managers deciding whether a retest earns its schedule hit before the data is used
How the work fits into the transaction or program
The review follows the test campaigns and precedes reliance on their results. It gives the supplier one read across electrical, thermal, and environmental data so that when this qualification feeds a TSO or an installation STC, every finding resting on it is already known to hold, and no cross-domain gap surfaces after the package is filed.
Start with a single asset
Confirm requirements map to substantiating evidence.
Jurisdiction-specific considerations
The FAA and EASA both accept DO-160G, but they can differ on how test credit survives a component change and on how thermal derating must be substantiated. The review flags the credit and derating claims most likely to be read differently between the two authorities.
Regulatory limits
This work assesses whether qualification evidence supports the claims made against it. It does not certify the equipment, make an airworthiness finding, or grant any approval, and it does not substitute for the applicant's own compliance demonstration.
What this review does not cover
- Conducting or witnessing the electrical, thermal, or environmental tests
- Selecting test conditions or writing the qualification test plans
- Issuing the formal compliance finding, which stays with the applicant and the authority
Specific to this review
- Power supply qualification crosses electrical, thermal, and environmental rigs, so the classic gap is two tests run on units at different component standards.
- Thermal derating is only as good as the top of the ambient envelope it covers, and campaigns often stop short of the design's real maximum.
- Power quality requirements live in the abnormal-input cases, so a capture at nominal input leaves the demanding requirements open.
- A single component change late in a program can invalidate a thermal survey while leaving power quality and environmental results intact.
Sources
U.S. Government (eCFR). Type certificates, STCs (Subpart E), TSO authorizations (Subpart O), PMA (Subpart K), and export airworthiness approvals (Subpart L).
European Union / EASA. EASA design and production certification, STCs, ETSO authorizations, and EASA Form 1 release.
RTCA. Environmental qualification test categories and procedures referenced by TSO and equipment qualification.
SAE International. Development assurance process at aircraft and system level, including requirements capture and validation.
Frequently asked questions
All our qualification tests passed. How could the evidence still fall short?
Passing closes a requirement only if the right condition was run on hardware that matches the shipping unit, against the criterion the requirement sets. In power supply qualification the frequent misses are a thermal survey that stopped below the design's maximum ambient, power quality captured only at nominal input, or a component change that quietly outdated an earlier thermal result. The review reads the electrical, thermal, and environmental data together to find those seams before the data has to defend a claim.
Relevant glossary terms
Related pages
Where this fits
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