STC certification
DO-160 environmental qualification report support for STC
This review readies the DO-160G environmental qualification report supporting an STC, so the categories the equipment was tested to match the environment it will actually see once installed. It is run for an aircraft modifier or equipment supplier as the qualification evidence is assembled. The work checks the environmental categories claimed, the test limits applied, and the installation assumptions the report rests on, and it flags where the qualified categories do not cover the installation location. You receive a gap assessment against the installation environment, an evidence map from each category to its test result, and a closure plan for the categories that do not yet cover the installation.
When this review is needed
- Equipment qualified for one installation is being installed in a location with a harsher environment.
- The qualification report claims categories the installation zone does not actually justify.
- A new installation position changes the vibration, temperature, or lightning environment the equipment must survive.
- The submittal will be examined for whether the qualified categories cover the real installation conditions.
The problem
A qualification report describes an equipment's environmental capability, but an STC is about a specific installation, and the two are matched only if someone checks. Equipment qualified for a benign avionics bay gets installed in a wing or a zone near the engines, and the categories that were fine in the original location no longer cover the vibration or temperature it now sees. The report reads as complete environmental proof while its categories were set for a different installation than the one the STC covers.
What gets reviewed
- Environmental categories claimed in the report checked against the installation location's real environment
- Test limits applied confirmed to meet or exceed what the installation zone demands
- Installation assumptions in the report reconciled to the actual STC installation
- Vibration, temperature, and other zone-driven categories matched to the installation position
- Categories that do not cover the installation flagged for additional qualification
- The environmental gaps collected into a closure plan
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
- Each claimed environmental category meets or exceeds what the installation location requires
- Test limits in the report cover the conditions the installation zone actually imposes
- The installation assumptions the report rests on match the STC's actual installation
- Zone-driven categories such as vibration and temperature suit the installation position
- No category is claimed for the installation that the qualification testing does not support
Evidence normally required
- The DO-160G qualification report with its categories and test results
- The installation definition, including the zone and position on the aircraft
- The environmental conditions defined for the installation location
- The equipment specification and its original qualification basis
- The certification basis identifying the applicable environmental requirements
Common discrepancies
- A vibration category qualified for a benign bay that the installation zone exceeds
- A temperature limit in the report below what the installation position reaches
- An installation assumption in the report that does not match the STC installation
- A category claimed for the installation with no test result behind it at that level
What is at stake
If a qualified category does not cover the installation environment, the equipment is unproven for where it will actually operate, and the authority treats the environmental compliance as open. Closing that gap can mean additional testing to a higher category, which is bench time and schedule the program did not plan. In service, an under-qualified installation is a reliability and safety exposure that the paperwork was supposed to have caught.
How the work runs
Define the installation environment
Establish the vibration, temperature, and other conditions the installation zone imposes.
Compare to the qualified categories
Check each claimed category and test limit against what the installation actually requires.
Reconcile the assumptions
Confirm the report's installation assumptions match the STC installation.
Plan the additional testing
Flag the categories that fall short and plan the qualification needed to close them.
What the buyer receives
- A gap assessment of the qualified categories against the installation environment
- An evidence map from each environmental category to its test result
- A closure plan for the categories that do not yet cover the installation
Who uses the output
- Certification engineers assembling the environmental evidence for the submittal
- Installation engineers who define the zone conditions the equipment must survive
- Program managers tracking which environmental categories still need additional testing
How the work fits into the transaction or program
The DO-160G report is one evidence stream feeding the compliance argument, and it is the one most tied to the specific installation rather than the equipment alone. This review runs as qualification evidence is assembled and matched to the installation, so a category shortfall is found while additional testing can still be scheduled, before the compliance matrix cites the report as closing an environmental requirement it does not.
Start with a single asset
Reduce finding cycles by checking the package first.
Jurisdiction-specific considerations
FAA and EASA both accept DO-160G as an environmental qualification standard, so the categories carry across bases, but each authority examines whether the qualified categories match the installation the STC actually covers. The review checks that match against whichever installation the examining authority will hold on file.
Regulatory limits
The review checks that the qualified categories cover the installation environment. It does not perform environmental testing, qualify the equipment, or grant the STC.
What this review does not cover
Specific to this review
- A qualification report proves equipment capability, but an STC is about a specific installation, so the categories only count once they are matched to where the equipment is actually mounted.
- Vibration and temperature are the categories that most often fall short, because the installation zone can be far harsher than the bay the equipment was originally qualified for.
- Closing an environmental gap usually means additional testing to a higher category, so finding it before the schedule is fixed is what keeps it from becoming late bench time.
Sources
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.
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.
Frequently asked questions
The equipment is already qualified. Why check DO-160 again for the STC?
Qualification proves the equipment survives a defined set of environmental categories, but those categories were chosen for some original installation. An STC puts the equipment in a specific location that may impose a harsher vibration, temperature, or lightning environment. The review confirms the qualified categories actually cover where this STC mounts the equipment, and flags any that do not.
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.
Talk through the aircraft, records, evidence, deadline, and next useful step.