Installation approval
Installation-approval support for equipment on an aircraft
Installation-approval support builds and checks the data needed to install an approved item of equipment on a specific aircraft and obtain the installation approval. It is used by avionics, equipment, and modification teams moving from a qualified or authorized article to an installed change on a particular type. It covers the installation interfaces, the aircraft-level environment and effects, the chosen approval path, and the substantiation that the installation does what the article approval assumed. You receive an installation data assessment, a gap list against the approval path, and a structured set tied to the target installation.
When this review is needed
- An approved or authorized item has to be installed on a specific type and the installation data does not exist yet.
- The installation environment differs from what the article was qualified to, and the difference has to be addressed.
- The team needs to choose and substantiate an approval path for the installation.
- Interfaces between the equipment and the aircraft systems need to be defined and shown to be compatible.
The problem
An approved article is not an approved installation. The authorization or qualification covers the box on its own; putting it on a particular aircraft introduces interfaces, power, cooling, structure, and an environment the article approval did not address. Teams that treat the article approval as the finish line discover the installation data is the part that was never built.
What gets reviewed
- The interfaces between the equipment and the aircraft systems and structure
- The aircraft-level environment compared to the article's qualification
- Power, cooling, mounting, and the physical installation requirements
- Aircraft-level effects the installation introduces and their assessment
- The chosen approval path and the data it requires
- Substantiation that the installation preserves what the article approval assumed
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 interface to aircraft systems and structure is defined and shown compatible
- The installation environment is within, or reconciled to, the article's qualification
- Power, cooling, and mounting provisions meet the equipment's requirements
- Aircraft-level effects of the installation are identified and assessed
- The approval path is selected and its required data is identified
- The installation does not invalidate the assumptions behind the article approval
Evidence normally required
- The article approval or authorization and its qualification basis
- The target aircraft type, configuration, and installation location
- Interface, power, and environmental data for the installation
- Existing installation drawings or wiring for the target type
- The intended approval path and any prior similar installations
Common discrepancies
- Installation environment exceeding the categories the article was qualified to
- Interfaces to aircraft systems defined on one side only
- Aircraft-level effects of the installation not assessed
- An approval path chosen without the data it requires identified
- Installation provisions that conflict with the equipment's stated requirements
What is at stake
Missing installation data stops the modification at the aircraft, where the cost is highest. Aircraft sit out of service waiting for substantiation, the chosen approval path stalls without the data behind it, and an environment mismatch found late can force re-qualification of the installed configuration.
How the work runs
Frame the installation
Define the target aircraft, location, and the interfaces the equipment introduces.
Reconcile the environment
Compare the installation environment to the article's qualification and address the gaps.
Assess the effects
Identify aircraft-level effects of the installation and select the approval path.
Build the data
Assemble the installation substantiation and a gap list against the chosen path.
What the buyer receives
- An installation data assessment for the equipment on the target aircraft
- A gap list against the chosen approval path
- A structured installation data set tied to the installation
Who uses the output
- Installation engineers building the modification data
- Certification leads pursuing the installation approval
- Modification program management sequencing the work
How the work fits into the transaction or program
The work bridges from an approved article to an approved installation on a specific aircraft. It draws the article's qualification basis forward into the installation context and feeds the ICA and submittal work that follows once the installation data is in place.
Start with a single asset
Reduce finding cycles by checking the package first.
Regulatory limits
Endeavor Elements supports the applicant's installation data. It does not issue an installation approval, perform a field approval, make compliance findings, or determine the installed aircraft is airworthy. The authority or its delegate approves the installation.
What this review does not cover
- Issuing an installation approval, STC, or field approval
- Making compliance findings or installing the equipment
- Determining airworthiness of the installed aircraft
Specific to this review
- An article approval covers the equipment in isolation; the installation introduces interfaces, environment, and aircraft-level effects the article approval never addressed.
- The installation environment is compared against the article's qualification categories, since an installed location can exceed what the box was tested to.
- Interfaces are checked from both sides, because a definition that exists only on the equipment side or only on the aircraft side hides incompatibilities.
- The approval path is treated as a data decision: choosing it without identifying the data it demands is a frequent reason installations stall at the aircraft.
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.
U.S. Government (eCFR). Maintenance recordkeeping content and approval-for-return-to-service requirements, including 43.9, 43.11, and Appendix B.
RTCA. Environmental qualification test categories and procedures referenced by TSO and equipment qualification.
Frequently asked questions
We already have a TSO authorization. Why is installation data still needed?
A TSO authorization covers the article on its own. Installing it on a specific aircraft introduces interfaces, environment, and aircraft-level effects that the authorization did not address, and those require their own installation data.
Do you choose the approval path for us?
We help evaluate the candidate paths against the installation and the available data, and identify what each path requires. The applicant decides and the authority approves the installation.
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.