Power-supply equipment
Power-supply equipment certification data support
Power-supply equipment certification covers the data an airborne power converter, inverter, or supply unit depends on to show it behaves correctly across the aircraft power environment. It is used by equipment and avionics teams preparing or recovering a power-supply program. The data centers on DO-160 power-input and power-quality behavior across normal, abnormal, spike, and interrupt conditions, conducted and radiated emissions in the installed configuration, and any DO-254 hardware lifecycle data for the complex parts inside. You receive a gap read against the applicable standards and a structured evidence set ready for review.
When this review is needed
- A new power-supply unit is heading toward authorization and the power-input and emissions data has to be assembled against the aircraft power architecture.
- A unit qualified for one power architecture is being applied to another and the power-quality categories no longer match the source.
- A program has stalled on emissions findings and the conducted and radiated evidence needs reconciling against the standard.
- A supplier wants an independent read of the power-quality and hardware data before authority submittal.
The problem
A supply unit is judged by how it behaves when the aircraft bus misbehaves, not only at steady state. DO-160 separates power input into normal, abnormal, spike, and interrupt cases, and a clean steady-state pass leaves most of those open. Emissions data captured on a bench with a clean source and a short load rarely represents the installed harness. The package often reads as complete while the conditions that actually drive findings are untested.
What gets reviewed
- The applicable certification basis and the standards referenced for the supply unit
- DO-160 power-input behavior across normal operation, abnormal voltage, voltage spikes, and power interrupts
- Power-quality behavior the downstream loads depend on, including ripple, regulation, and inrush
- DO-160 conducted and radiated emissions and susceptibility for the unit and its installed harness
- DO-254 hardware lifecycle data for any complex programmable parts in the design
- Requirements traceability from the supply specification through verification
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
- DO-160 power-input categories tested match the aircraft power source the unit will draw from
- Abnormal-voltage, voltage-spike, and interrupt behavior is substantiated rather than inferred from steady-state results
- Power-quality limits the downstream loads rely on are verified at the unit output
- Conducted and radiated emissions cover the configuration, load, and harness the installation will use
- Any complex programmable hardware carries DO-254 lifecycle data consistent with its design assurance level
- Each supply requirement maps to a means of compliance and to evidence that currently supports it
Evidence normally required
- The draft or current certification basis and qualification plan for the supply unit
- Power-input, power-quality, and emissions test reports assembled so far
- Hardware lifecycle data for the programmable parts in the design
- The aircraft power architecture and the harness and load definition for the installation
- Open findings or prior authority correspondence if the program is in progress
Common discrepancies
- Power-input categories tested against a cleaner source than the aircraft architecture actually supplies
- Abnormal-voltage and voltage-spike behavior left unsubstantiated behind a steady-state pass
- Emissions data taken in a configuration that does not match the installed harness or load
- Complex programmable parts treated as simple, leaving the DO-254 lifecycle data thin
- Inrush and ripple limits asserted from the specification without measured verification
What is at stake
An unqualified abnormal-voltage or interrupt case, or emissions taken in the wrong configuration, turns a single review into several rounds of retest. Each round consumes lab time, harness builds, and the engineering hours the program had reserved for closing real design gaps.
How the work runs
Anchor the source
Confirm the aircraft power architecture and the DO-160 power-input categories the source quality demands.
Probe the abnormal cases
Check abnormal-voltage, spike, and interrupt behavior against measured evidence rather than steady-state inference.
Match the configuration
Verify conducted and radiated emissions were captured in the installed load and harness configuration.
Reconcile the hardware
Confirm complex programmable parts carry DO-254 data at the right assurance level and package the gaps.
What the buyer receives
- A gap read against the applicable power-supply and environmental standards
- A reconciled view of power-input, power-quality, emissions, and hardware evidence
- A prioritized list of the data needed to close the package
Who uses the output
- Certification leads preparing the power-supply submittal
- Power-electronics and EMC engineers closing the test gaps
- Hardware design-assurance leads reconciling the DO-254 data
How the work fits into the transaction or program
The work supports the supplier's own power-supply certification program. It separates the power-input, emissions, and hardware stories into checkable claims so the missing conditions surface before submittal and review runs shorter.
Start with a single asset
Confirm requirements map to substantiating evidence.
Regulatory limits
Endeavor Elements supports the applicant's power-supply certification data. It does not issue an authorization, make compliance findings on the authority's behalf, or guarantee acceptance of the unit. The applicant and the authority retain their roles.
What this review does not cover
- Performing the power-input, emissions, or environmental testing itself
- Issuing any approval or design approval
- Acting as the authority or making official compliance findings
Specific to this review
- DO-160 separates power-input behavior into normal, abnormal, voltage-spike, and interrupt conditions, so a steady-state pass alone leaves several required cases open.
- A supply unit qualified for one aircraft power category can fail in another because the source quality and interrupt profile differ between architectures.
- Programmable parts that look simple often meet the complexity threshold for DO-254 lifecycle data, which is a frequent gap in supply-unit packages.
- Emissions behavior depends on the load and harness present at test, so bench results with a token load seldom represent the installed condition.
Sources
RTCA. Environmental qualification test categories and procedures referenced by TSO and equipment qualification.
RTCA. Design assurance objectives and lifecycle data for airborne electronic hardware (FPGA/ASIC/PLD).
U.S. Government (eCFR). Type certificates, STCs (Subpart E), TSO authorizations (Subpart O), PMA (Subpart K), and export airworthiness approvals (Subpart L).
Federal Aviation Administration. STC application process, certification basis, and continued airworthiness obligations of an STC holder.
Frequently asked questions
Why is a steady-state pass not enough for power input?
DO-160 power input is defined across normal, abnormal, spike, and interrupt conditions. Steady-state behavior is only one of them, so a pass there still leaves the abnormal cases to substantiate.
Relevant glossary terms
Related pages
Where this fits
Talk to an engineer who has done this work
We will walk through your current state, the records or evidence involved, and a scoped first engagement.
Walk through your situation with an engineer who has done this work.