Communication TSO
Communication equipment certification evidence for TSO authorization
This support prepares the certification evidence for a communication article so it stands up to a TSO authorization. It reads the radio performance data, the antenna and electrical-load substantiation, and the environmental qualification the way an authority reviewer will, then ties each claim to a document that exists. An engineer who has built communication packages runs it during evidence assembly, before the application goes in. You receive a product-specific evidence gap list, a trace map into the certification basis and means of compliance, and a closure sequence that clears the article for authorization.
When this review is needed
- A VHF or HF radio article is heading toward a TSO authorization and the evidence needs a read before the application is filed.
- Spurious emission or receiver selectivity data has to be reconciled with the performance the authorization claims.
- An electrical-load or power-input result changed and the affected substantiation has to be regenerated and re-checked.
- An earlier radio authorization is being extended to a new part number and the reused data has to be tested for currency.
The problem
Communication articles carry evidence that has to agree across the transmit and receive chains at once. Transmit power and spurious emissions, receiver sensitivity and selectivity, antenna matching, power-input behavior, and DO-160G environmental qualification all land as separate results. A gain claimed at the antenna, a load assumed on the bus, and an emission measured on the bench can each be defensible alone yet inconsistent when read as one package, and the supplier who owns the application often cannot see the seam.
What gets reviewed
- Transmit power, spurious emissions, and modulation claims traced to the test reports that measured them
- Receiver sensitivity, selectivity, and desensitization data checked against the performance requirements
- Antenna matching and electrical-load substantiation reconciled to the article's power-input behavior
- Radio environmental categories under DO-160G verified against the bench qualification reports on file
- The certification basis and its means of compliance confirmed so transmit and receive evidence reads as one submission
- Part-number configuration for the authorized radio reconciled to the reports that substantiate it
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 transmit and receive performance figure resolves to a measured report rather than a specification restatement
- Spurious emission results stay inside the limits the authorization and the shared-antenna environment require
- Declared electrical loads agree with the power-input testing and the article's stated draw
- Declared DO-160G categories match the environmental conditions the article is being authorized for
- The standard revision each performance limit cites is the one the bench evidence was actually measured against
Evidence normally required
- The radio's TSO authorization application draft with the certification basis it declares
- Transmit and receive performance test reports for the radio article
- Antenna matching and electrical-load substantiation with power-input data
- DO-160G bench reports covering the radio's declared environmental categories
- The radio's part-number definition and the configuration the evidence supports
Common discrepancies
- A spurious-emission claim referenced to a limit that the bench report does not actually meet with margin
- Receiver selectivity stated at a level the desensitization testing never demonstrated
- An electrical-load figure in the substantiation that disagrees with the measured power-input data
- Environmental categories claimed for the radio that reach beyond what the bench campaign tested
What is at stake
A performance claim without the report behind it draws a finding and holds the authorization until the evidence is produced or the claim withdrawn. Radio articles sit on shared antennas and shared buses, so a spurious-emission or load claim that does not hold can cascade into other equipment on the same aircraft, which is why authorities read these results against each other rather than one at a time.
How the work runs
Anchor to the radio's TSO
Fix the TSO the radio is being authorized against and the performance limits it invokes.
Trace both chains
Follow every transmit and receive claim to the report that measured it.
Reconcile load and antenna
Confirm electrical-load and antenna assumptions agree with the power-input and matching data.
Order the radio gaps
Sequence the open items by closure difficulty against the radio's filing date.
What the buyer receives
- A product-specific gap list on the radio evidence, ranked by how hard each item is to close before filing
- A trace map linking each communication claim to the certification basis, means of compliance, and its report
- A closure sequence that orders the transmit, receive, and load evidence against the authorization timeline
Who uses the output
- Certification engineers assembling the TSO authorization application for the radio article
- Engineering leads deciding which team regenerates the missing performance or load evidence
- Program managers holding the radio's authorization date against the evidence still open
How the work fits into the transaction or program
The review sits between bench testing and the authorization application, taking the transmit, receive, and environmental results and testing whether they read as one consistent package. Its gap list drives the evidence work that has to close before submittal, and its trace map becomes the reference later finding responses point back to.
Start with a single asset
Confirm requirements map to substantiating evidence.
Jurisdiction-specific considerations
Frequency plans, channel spacing, and spurious-emission limits do not map identically between the FAA and the European system, so a radio authorized under a TSO can meet a different limit set when the same evidence is presented for European acceptance. The review flags where a performance claim rests on a limit the other authority applies differently.
Regulatory limits
The review reads the evidence and shows where it is complete or thin. It does not grant a TSO authorization, approve the article, or make an airworthiness determination on the communication function or its installation.
What this review does not cover
- Generating the missing performance, load, or environmental evidence
- Preparing and filing the radio's TSO authorization application for the supplier
- Any installation approval or airworthiness determination on the radio once fitted
Specific to this review
- Radio evidence has to be read across the transmit and receive chains together, because a claim that is defensible on one chain can be inconsistent with the antenna or load assumed on the other.
- Spurious emissions are a shared-aircraft problem, so a communication article's emission report is read against the other equipment on the same antenna and bus, not just its own limit.
- Electrical-load figures are the ones most likely to disagree between the substantiation and the measured power-input data, because they are estimated early and rarely reconciled to test.
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
Our bench reports all show passes. Why do they still need mapping?
A pass on one report can still be inconsistent with another. The review reads transmit, receive, load, and environmental results as one package, so an emission limit, an antenna gain, and a bus load that were each demonstrated separately actually agree before the authority reads them together.
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.