Environmental qualification report
DO-160 qualification report evidence review for modifiers
A DO-160 qualification report evidence review checks that the environmental categories tested, the limits applied, and the setup assumptions in the report match the installation the equipment will fly in. It is run for aircraft modifiers before a submittal, in response to a finding on environmental qualification, or when an installation change shifts the equipment's environment. The review targets the mismatch between the qualification envelope and the installed location, and the setup assumptions that quietly narrow what the report proves. You get a gap list, an evidence map from each category to the installation requirement, and a closure order.
When this review is needed
- A submittal relies on the DO-160 report to show the equipment survives its installed environment.
- A finding questioned whether a tested category envelope covers the installation location.
- An installation change moved the equipment to a zone with a different vibration, temperature, or lightning environment.
- Qualification was inherited from a prior program and the installation on this aircraft was never re-checked against it.
The problem
DO-160 qualification proves the equipment survived a defined set of environmental categories, but certification needs it to survive this installation. The report and the installation are written by different people at different times. A unit qualified to a vibration category for one zone gets installed in another; a temperature category assumes cooling that the actual bay does not provide. The report looks complete on its own, yet its envelope and the installed environment were never reconciled.
What gets reviewed
- Each tested environmental category compared against the requirement for the installed location
- Test limits checked against the severity the installation zone actually imposes
- Setup and configuration assumptions in the report checked against how the equipment is installed
- Categories not tested confirmed as genuinely not applicable rather than overlooked
- Lightning, HIRF, and power-input results checked against the aircraft-level environment for the zone
- Any category tested to a prior installation confirmed to still bound the new one
What gets validated
- Every environmental category required by the installation appears as tested in the report
- The tested severity level meets or exceeds what the installation zone imposes
- The report's setup and cooling assumptions match the actual installation
- Categories declared not applicable are justified against the installation, not merely omitted
- Lightning and HIRF results align with the aircraft-level environment for the equipment's location
Evidence normally required
- The DO-160G qualification report with its category table and test setup
- The installation description including zone, mounting, and cooling
- The aircraft-level environmental definition for the equipment location
- The equipment specification stating its required qualification categories
- Any prior qualification the report reuses or references
Common discrepancies
- A vibration or temperature category tested for a different zone than the equipment is installed in
- A cooling assumption in the report that the actual installation bay does not meet
- A required category, such as HIRF or lightning, absent from the tested set
- Reused qualification from a prior installation that no longer bounds the current one
What is at stake
A qualification envelope that does not cover the installation leaves an equipment location that is unproven for the environment it will actually see, which an authority will find because the category-to-zone comparison is concrete and checkable. Correcting it can mean re-testing to a higher category, and if the mismatch is caught late that re-test lands squarely on the critical path.
Move from findings to resolution
Identify gaps against the means of compliance.
How the work runs
Map installation to categories
Establish the environmental categories the installed location requires from the aircraft-level definition.
Compare against the report
Check each required category, its severity, and its setup assumptions against what the report actually tested.
Screen reuse and not-applicable calls
Confirm reused qualification still bounds the installation and that omitted categories are genuinely not applicable.
Deliver coverage gaps
Return the uncovered or unjustified categories with an evidence map and a re-test-first closure order.
What the buyer receives
- A gap list of categories that do not cover the installation or lack justification
- An evidence map tying each installation environmental requirement to its qualification result
- A closure order that resolves the uncovered categories most likely to need re-test first
Who uses the output
- STC program managers judging whether qualification will hold against the installation
- Certification engineers answering a finding on environmental category coverage
- Engineering leads scheduling any re-test the coverage gaps demand
How the work fits into the transaction or program
Environmental qualification is one leg of the equipment's compliance, and it only counts if the categories tested match where the unit flies. Reconciling the report with the installation before submittal keeps the compliance matrix from crediting a qualification envelope that the installed location has quietly outgrown.
Start with a single asset
Confirm requirements trace through verification.
Jurisdiction-specific considerations
FAA and EASA both accept DO-160 as an environmental qualification standard, but the aircraft-level environment for lightning and HIRF is set by the installation's certification basis, which can differ between the two. The review compares the report against the governing basis for the zone rather than treating the DO-160 categories as self-sufficient.
Regulatory limits
This review checks the modifier's qualification evidence against the installation. It does not qualify the equipment, does not make a compliance finding, and does not determine airworthiness. Judging qualification sufficiency for approval remains with the authority.
What this review does not cover
- Performing or witnessing DO-160 testing
- Re-authoring the qualification report
- Defining the aircraft-level environmental requirement for the zone
Specific to this review
- The category table can be fully populated and still wrong, because a category tested for one zone does not automatically bound another with different vibration or temperature.
- Cooling assumptions are a frequent hidden failure: the report qualifies to a temperature the installation bay cannot actually hold.
- Lightning and HIRF are set at aircraft level for the installed location, so equipment-level DO-160 results alone can leave those categories unproven for the zone.
- Reused qualification saves time until the new installation is more severe than the old one, at which point the reuse silently undercovers the equipment.
Sources
RTCA. Environmental qualification test categories and procedures referenced by TSO and equipment qualification.
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.
Frequently asked questions
The equipment is already DO-160 qualified. Why check the report?
Qualification proves the unit survived a set of categories in a lab. Certification needs those categories to match this installation. The review reconciles the two, catching a zone, severity, or cooling mismatch before it becomes a finding.
Relevant glossary terms
Related pages
Where this fits
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