Development assurance
DO-356A security methods for threat conditions, security measures, and effectiveness evidence
For avionics suppliers, OEMs, Engineering teams, this review is used when Airworthiness security planning. EE checks threat-condition and attack-path identification, security risk assessment and level, selected security measures and architecture against the approval basis, the configuration baseline, and the available security analyses. The output gives security engineers and systems engineers an evidence map, discrepancy register, request list, and closure plan for the records that need applicant, supplier, or authority disposition.
What gets reviewed
- Challenge threat-condition and attack-path identification against the claim it supports.
- Reconcile security risk assessment and level against the claim it supports.
- Confirm selected security measures and architecture against the claim it supports.
- Index effectiveness-evidence (analysis/test) tying measures to threats against the claim it supports.
- Compare approval basis against the claim it supports.
- Trace configuration definition against the claim it supports.
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
- Source control: threat-condition and attack-path identification fails review if the cited record cannot be tied to the current baseline.
- Closure owner: security risk assessment and level fails review if the cited record cannot be tied to the current baseline.
- Configuration match: selected security measures and architecture fails review if the cited record cannot be tied to the current baseline.
- The review notes that evidence link: effectiveness-evidence (analysis/test) tying measures to threats fails review if the cited record cannot be tied to the current baseline.
- Limit carryover: approval basis fails review if the cited record cannot be tied to the current baseline.
Evidence normally required
- Manual source: threat-condition and attack-path identification
- Configuration item: security risk assessment and level
- Closure evidence: selected security measures and architecture
- Baseline record: effectiveness-evidence (analysis/test) tying measures to threats
- Test file: approval basis
- Analysis note: configuration definition
Common discrepancies
How the work runs
Frame 356a Airworthiness
Confirm the exact event, affected file set, buyer role, and decision standard before any threat-condition and attack-path identification is treated as sufficient.
Trace Methods Support
Walk the named evidence from index entry to source artifact and mark where the trail supports, conflicts with, or fails to answer the page-specific question.
Sort Review Threat
Group exceptions by closure route: document retrieval, data correction, engineering disposition, authority response, or contractual decision.
Package Measures Effectiveness
Deliver the exception list, evidence map, and owner sequence in a form that can move directly into remediation, submittal cleanup, or transaction negotiation.
What the buyer receives
- The review notes that evidence map for DO-356A Airworthiness Security Methods
- Discrepancy register for DO-356A Airworthiness Security Methods
- Applicability and approval basis summary
- Source record request list
Who uses the output
- security engineers use the map to brief the decision.
- systems engineers use the register to assign closure.
- certification liaisons use the request list to collect source records.
How the work fits into the transaction or program
How a system shows airworthiness-security effectiveness under DO-356A once DO-326A has framed the process, because DO-356A is the methods layer: identifying threat conditions, assessing the security risk, selecting security measures, and evidencing their effectiveness against the identified attacks. The evidence set centers on the threat-condition and attack-path identification, the security risk assessment and level, the selected security measures and architecture, and the effectiveness-evidence (analysis/test). The likely weak points are threats enumerated but effectiveness never demonstrated, security measures that do not cover an identified attack path, and a risk assessment disconnected from the safety assessment; Distinct from round-1's process-level security pages: this is the methods/effectiveness layer. The output gives the security engineer a cleanup register for DO-356A security methods for threat conditions, security measures, and effectiveness evidence before airworthiness security planning.
Start with a single asset
Reduce finding cycles by checking the package first.
Regulatory limits
EE does not grant certification credit, approve data, or sign return-to-service records. The package documents what was checked and what remains open for the responsible certification parties.
Specific to this review
- how a system shows airworthiness-security effectiveness under DO-356A once DO-326A has framed the process, because DO-356A is the methods layer: identifying threat conditions, assessing the security risk, selecting security measures, and evidencing their effectiveness against the identified attacks.
- Threat-condition and attack-path identification often controls whether later summaries can be trusted.
- Threats enumerated but effectiveness never demonstrated is treated as a record gap until an owner closes it.
- FAA and EASA evidence should stay distinguishable from commercial claims and installer notes.
- The scope uses the 356a Airworthiness Security Methods question as the control point, so the review stays tied to Airworthiness security planning and the buyer decision behind it.
- The evidence starts with Threat-condition and attack-path identification and follows Support Evidence Review Threat references until every exception has a source location and a reason code.
- The finding logic separates missing paperwork, conflicting status, stale revision data, and unsupported disposition because each class closes through a different owner.
- The timing matters for security engineer: the output is useful only if the unresolved items are visible before acceptance, submittal, handback, or negotiation pressure fixes the sequence.
- The boundary control keeps Conditions Measures Effectiveness Development questions in the records or certification lane and sends technical acceptance issues to the authorized people who own them.
- The handoff value comes from Evidence map for DO-356A Airworthiness Security Methods; it gives the next reviewer a precise map instead of another broad request for a better file.
Sources
RTCA. Airworthiness security process objectives for aircraft systems exposed to intentional unauthorized electronic interaction.
SAE International. Safety assessment methods (FHA, PSSA, SSA, FTA, FMEA) supporting development assurance level assignment.
Frequently asked questions
What makes this standards review different from a general file audit?
The scope is tied to 356a airworthiness security methods and to the decision named in the request. A general audit can list weak records; this pass ranks the gaps by whether they block airworthiness security planning or can be closed later without changing the decision.
What evidence has to be available before this work starts?
The starting point is threat-condition and attack-path identification, the current status source, and any index or matrix that tells reviewers where the supporting artifact should live. Missing inputs are logged as findings rather than filled with assumptions.
Who decides whether an open item is acceptable?
The review explains what the evidence supports and gives security engineer a closure path. Acceptance remains with the buyer, operator, authority, delegated engineer, or authorized person responsible for the underlying airworthiness or certification decision.
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.