Flight-deck equipment STC
Flight-deck equipment certification evidence for STC installation
This support prepares the certification evidence a modifier needs to gain STC approval for installing flight-deck equipment on a specific aircraft. It serves suppliers and modifiers fitting a control panel, display, or crew interface device who must show the installation meets the aircraft's certification basis. The work examines the human interface, display behavior, environmental qualification, and installation assumptions, then connects them to the certification basis, the means of compliance, and the aircraft's current configuration. You receive an installation-specific evidence gap list, a trace map from requirement to substantiation, and a sequence for closing the open items ahead of the STC application.
When this review is needed
- A flight-deck control or display is being installed under an STC and the evidence has not been anchored to the aircraft's certification basis.
- A TSO article is going into a specific aircraft and the installation case still has to be built.
- The installation changes crew workload or panel layout and the human factors effect needs substantiation.
- The target aircraft's configuration differs from the baseline the equipment was qualified against.
The problem
STC installation is where article-level qualification meets a specific airframe, and the two rarely line up on their own. A display that met its standard on the bench still has to be shown safe in this cockpit, wired into this electrical system, at this position error and workload. Modifiers often hold strong article data and a thin installation case, and the certification basis for the aircraft is what the installation has to satisfy, not the standard the box was qualified to.
What gets reviewed
- The aircraft's certification basis for the installation identified and turned into a compliance position
- Human interface and workload effects of the installed equipment substantiated for this flight deck
- Display behavior and integration with existing cockpit systems reconciled with the installation
- Environmental and electrical integration into the target aircraft confirmed against its systems
- Configuration effectivity established so the installation applies to the intended aircraft serial numbers
- Article-level qualification carried into the installation case where it remains valid
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 certification basis requirement for the installation maps to installation substantiation, not just article data
- Human factors and workload effects are evaluated for this cockpit rather than assumed from the article
- Electrical integration fits within the target aircraft's load budget and wiring provisions
- Configuration effectivity names the serial numbers and prior modifications the installation depends on
- Article qualification carried forward is valid for the installed environment, not just the bench
Evidence normally required
- The target aircraft's certification basis and type design data relevant to the installation
- The article's TSO or qualification data being installed
- Installation drawings covering panel layout, wiring, and structural attachment
- The human factors and workload assessment for the modified flight deck
- The aircraft's current configuration and modification status
Common discrepancies
- An installation resting on article qualification with no case for the airframe-specific effects
- Human factors substantiation assumed from the article rather than evaluated for this cockpit
- Electrical integration that exceeds the target aircraft's available load or wiring provisions
- Configuration effectivity that does not account for a prior modification on the target serial numbers
What is at stake
An STC package that leans on article qualification without an installation case draws findings on the parts that are installation-specific: workload, layout, electrical integration, and configuration effectivity. Those findings can require flight or ground evaluation on the aircraft, and discovering them after submittal delays the approval and the installation slots the operator has booked.
How the work runs
Anchor to the aircraft basis
Identify the certification basis for the installation on the target aircraft and set the compliance position.
Build the installation case
Substantiate workload, integration, and airframe effects that article data does not cover.
Carry forward valid qualification
Reuse article qualification where it holds for the installed environment and flag where it does not.
Sequence the closure
Order the airframe-specific gaps ahead of the STC application.
What the buyer receives
- An installation-specific evidence gap list against the aircraft's certification basis
- A trace map linking each installation requirement to its substantiation
- A closure sequence for the open items ahead of the STC application
Who uses the output
- Certification engineers building the STC installation case
- Modifiers deciding what installation analysis or evaluation still has to be run
- Program leads sequencing closure against the installation and approval schedule
How the work fits into the transaction or program
The support sits between the article's qualification and the STC application, building the installation case that article data does not by itself provide. It carries valid qualification forward and identifies the airframe-specific work that remains, so the STC package reaches the authority as a mapped installation position rather than a box's data with an installation attached.
Start with a single asset
Confirm requirements map to substantiating evidence.
Jurisdiction-specific considerations
An STC approved under the FAA does not automatically carry to an EASA-registered aircraft, and the validation route between the two adds its own substantiation and configuration checks. The mapping notes where an installation finding accepted by one authority needs separate work for the other so a bilateral validation does not assume the original case transfers whole.
Regulatory limits
The support prepares and maps the installation evidence for an STC application. It does not grant the STC, approve the installation, or make an airworthiness determination. Those decisions rest with the authority and its designees.
What this review does not cover
- Performing the installation, ground, or flight evaluation
- Designing the installation or developing the modification data
- Issuing the STC or any installation approval
Specific to this review
- An STC installation has to satisfy the aircraft's certification basis, which is often not the same standard the article was qualified to, so article data alone never completes the case.
- Workload and panel layout effects are installation-specific and cannot be inherited from the article, which is why a strong TSO package can still fail on human factors in the cockpit.
- Configuration effectivity is where an STC quietly breaks: a prior modification on the target serial numbers can invalidate an installation that was drawn against a clean baseline.
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.
RTCA. Objectives and lifecycle data for airborne software assurance, by design assurance level (DAL A-E).
Frequently asked questions
If the equipment already has a TSO, why is more evidence needed for the STC?
A TSO shows the article meets its performance standard. The STC has to show the installation meets the aircraft's certification basis, which covers workload, electrical integration, and configuration effects the article data does not address. The support builds that installation case on top of the article qualification.
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.