Business-aircraft installation
Business-aircraft installation evidence for STC installation approval
This review prepares the certification evidence a modifier needs to install equipment on business aircraft under an STC and secure installation approval. An engineer works through the cabin configuration assumptions, the electrical load evidence, the environmental qualification, and the continued-airworthiness tasks, then reconciles each against the STC certification basis and the agreed means of compliance. It runs once the installation design is set. You receive an installation-specific gap list, a trace map from requirement to evidence, and a closure sequence shaped by the owner-driven cabin and electrical variation these aircraft carry.
When this review is needed
- A business-aircraft STC installation is heading for approval and its electrical and cabin evidence has to answer the basis.
- The installation is being adapted from one cabin layout to a range the fleet actually flies.
- Prior owner modifications changed the electrical baseline the STC installation connects into.
- The STC's continued-airworthiness tasks have to be reconciled with the qualified limits before submission.
The problem
A business-aircraft STC ties the installation to a specific cabin and electrical baseline, but that baseline shifts as owners reconfigure interiors and add equipment. The electrical interface the STC assumes may already be loaded by modifications the installation team did not account for, and the environmental qualification is scoped to one layout. When the cabin configuration data, the load evidence, and the continued-airworthiness tasks are assembled for approval, the baseline they assume rarely matches the aircraft in front of the modifier.
What gets reviewed
- Cabin configuration assumptions reconciled against the STC installation's fielded layouts
- Electrical load evidence checked against the aircraft's current, modified baseline
- DO-160G environmental qualification matched to the installation environment
- Owner-modification history considered where it affects the STC interface
- Continued-airworthiness tasks reconciled with the qualified limits
- The evidence configuration confirmed against the current STC installation design
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 electrical load case reflects the modified baseline the STC installation actually connects to
- Environmental qualification covers the cabin environment the installation presents
- Cabin configuration assumptions bound the layouts the STC will be installed into
- Continued-airworthiness tasks trace to the qualified limits, not a carried-over template
- No requirement relies on evidence written for a cabin or electrical baseline since superseded
Evidence normally required
- The STC certification basis and the applicant's compliance checklist
- DO-160G environmental qualification results
- The aircraft's current electrical load analysis and modification list
- Cabin configuration and installation drawings
- Draft continued-airworthiness tasks for the STC
Common discrepancies
- A load case built on the original electrical baseline rather than the modified one
- Environmental qualification scoped to a layout the target aircraft no longer has
- Cabin configuration assumptions that miss a fielded interior variant
- Continued-airworthiness tasks inherited from a template unchanged
What is at stake
An STC installation submitted against an outdated electrical baseline draws findings at the interface, because the authority can see the assumed load does not reflect the modifications already on the aircraft. Reworking the load case or the environmental scope late is slow, and a continued-airworthiness task that does not match the installation forces a revision the operator will flag. Both push approval into another cycle the modifier funds.
How the work runs
Fix the baseline
Establish the current cabin and electrical baseline the STC installation connects into.
Reconcile the load
Check the electrical case against modifications already present on the aircraft.
Cover the layouts
Confirm environmental and configuration assumptions bound the fielded interiors.
Order the closure
Resolve the electrical and cabin evidence first, then the supporting data.
What the buyer receives
- An installation-specific evidence gap list keyed to the STC requirements
- A requirement-to-evidence trace map across electrical, environmental, and airworthiness data
- A closure sequence resolving the electrical baseline and cabin evidence first
Who uses the output
- Certification leads presenting the STC installation to the authority
- Electrical and systems engineers who own the load and interface artifacts
- Program managers weighing rework against the approval date
How the work fits into the transaction or program
The review sits between equipment qualification and the STC installation submission for business aircraft. It confirms the electrical, environmental, and continued-airworthiness evidence answers the STC basis against the modified baseline the aircraft carries, so mismatches surface internally rather than in the authority's findings. The trace map anchors the compliance submission.
Start with a single asset
Confirm requirements map to substantiating evidence.
Jurisdiction-specific considerations
An STC installation pursued for both FAA and EASA acceptance meets two bases that can differ in how they treat electrical load substantiation and continued-airworthiness content for a business-aircraft cabin. The review flags where one authority will require a baseline-specific load case the other accepts by read-across.
Regulatory limits
The review confirms the installation evidence is complete and consistent with the STC basis. It does not grant the STC, approve the installation, or determine airworthiness of the modified aircraft.
What this review does not cover
- Performing the electrical load analysis or environmental qualification
- Authoring the continued-airworthiness tasks
- Any approval or airworthiness decision on the STC
Specific to this review
- The electrical baseline an STC assumes is often already changed by owner modifications, so the load case has to be checked against the modified aircraft rather than the type baseline.
- A cabin layout captured in the installation drawings may not match the specific aircraft, because interiors are reconfigured between the design and the install.
- Continued-airworthiness tasks copied from a template are a recurring STC finding, since the qualified limits on this installation rarely match the template's.
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
How is this different from the business-aircraft TSO installation review?
The evidence overlaps, but the approval path differs. This review assembles installation evidence for an STC installation approval, where the certification basis is set by the STC. The TSO review targets a TSO authorization. The cabin and electrical reconciliation is common to both.
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.