{"actors":["Wind-tunnel facility engineer, who maintains the facility-condition record and reference-run procedure","Instrumentation engineer, who validates balance, pressure, temperature, and flow-measurement signals","Aerodynamic test engineer, who interprets reference-article trends and separates facility drift from setup variation","Configuration manager, who binds each observation to tunnel, reference article, mount, instrumentation, software, and environmental states","Test director, who decides whether diagnosis, recalibration, maintenance, repeated testing, or a temporary test pause is warranted","Design-analysis lead, who assesses whether previously collected evidence requires review after confirmed drift"],"affected_objective":"Preserve the stability and cross-campaign comparability of aerodynamic evidence produced by a reusable subsonic wind-tunnel measurement chain.","arm":"ORDINARY_DIVERSE_P2","authority_safety":{"authorized_first_step":"The facility engineer may perform a read-only retrospective using existing calibration records, reference or checkout runs, maintenance logs, and test data; any later shadow check run must occur within an already authorized tunnel session using an approved article and procedure.","decision_authority":"Only the test director, through existing facility safety, calibration, and test-governance procedures, may order recalibration, maintenance, repeated testing, data qualification, or a test pause; the relevant design authority decides whether prior design evidence must be reconsidered.","excluded_actions":["Automatically invalidating campaign data from a pilot warning","Changing certified calibration limits or facility operating envelopes","Stopping tunnel operation without existing test or safety authority","Inferring that an individual instrument has failed solely from an aggregate reference residual","Modifying the reference article, mounting hardware, data-reduction software, or tunnel configuration outside approved procedures","Using pilot results to evaluate individual staff performance"],"halt_rollback":"Halt the pilot if reference checks create equipment risk, consume unauthorized tunnel time, expose controlled design data, or repeatedly generate residuals that cannot be reproduced under controlled setup conditions. Remove pilot-only alerts, retain an audit copy of observations, and return interpretation and action entirely to existing calibration and test-governance procedures; no source test record is altered."},"baseline":"The target workflow calibrates individual instruments and performs campaign-specific readiness checks, while acceptance of the complete tunnel-to-result chain is primarily tied to current tolerances. Reference observations, when available, are not maintained as a configuration-linked trend with explicit warning bands and owned response triggers. Small changes in balance behavior, mount compliance, pressure-channel availability, flow uniformity, surface condition, or data reduction can therefore remain locally acceptable while the combined measurement response moves away from its established condition.","candidate_id":"deterioration_monitoring__engineering_design__ORDINARY_DIVERSE_P2","causal_chain":["Repeated installation cycles, minor contamination, mount wear, sensor creep, channel loss, maintenance substitutions, and software changes gradually alter the wind-tunnel measurement chain.","Each alteration can remain inside its component-level tolerance, so campaign readiness checks do not necessarily expose their combined influence on derived aerodynamic results.","Differences among test articles and operating points make cross-campaign result movement difficult to attribute to either real aerodynamics or facility-condition drift.","Recurring runs of a stable reference article at fixed operating points create an externally observable signature of the integrated measurement chain.","Configuration-linked history reveals the direction, rate, persistence, localization, and acceleration of deviations rather than treating each check as an isolated pass or fail.","Warning bands trigger controlled replication and component-level diagnosis while recalibration, cleaning, mount repair, or software rollback remain feasible.","Confirmed unacceptable drift enters existing test governance for maintenance, data qualification, repeated testing, or a temporary pause decided by authorized owners.","Findings from diagnosis and subsequent reference runs recalibrate indicators, thresholds, setup controls, and inspection cadence."],"cell_id":"deterioration_monitoring__engineering_design","consequence":"If integrated measurement-chain drift remains indistinguishable from test-article behavior, engineers may base geometry, control, or performance decisions on evidence whose cross-campaign comparability has deteriorated, with the ambiguity discovered only during later verification or conflicting tests.","diversity_from_prior_proposals":"This opportunity monitors the physical and computational condition of a reusable experimental evidence chain across test campaigns. Its problem, intervention, and causal path concern cumulative bias in wind-tunnel results and reference-article checks, rather than erosion of multidisciplinary design reserves across product revisions.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Establish a configuration-controlled Reference-Article Drift Sentinel for one subsonic wind tunnel. Preserve an approved reference body, mount specification, operating-point set, instrumentation map, and data-reduction version. At the start and end of each test campaign, after relevant maintenance or software change, and at a facility-approved interval during extended campaigns, run or reconstruct the same reference conditions. Record disaggregated signals including balance-zero return and hysteresis, reference force and moment coefficient residuals, pressure-channel dropout, flow-uniformity measurements, repeat-run dispersion, mount inspection findings, environmental corrections, and data-reduction checksums. Define healthy, acceptable, warning, and unacceptable bands from the facility's approved baseline and uncertainty treatment. A warning requires persistence, acceleration, correlated movement across signals, or a projected threshold crossing within diagnosis lead time, not one unexplained point. Warning conditions trigger an authorized replication and root-cause probe; confirmed unacceptable conditions enter existing governance for recalibration, cleaning, repair, software rollback, data qualification, repeated testing, or a temporary pause. Review false alarms, missed discrepancies, maintenance findings, and setup sensitivity to revise indicators, bands, and cadence.","mechanism_mapping":[{"counterfactual_removal":"Without a stable end-to-end reference signature, gradual combined changes remain confounded with differences among test articles and campaigns.","mechanism_slug":"observability","role":"Makes latent deterioration of the tunnel, mount, instrumentation, and reduction chain inferable from repeatable reference residuals."},{"counterfactual_removal":"Without configuration-defined states, observations taken under different mounts, instrumentation maps, software versions, or facility conditions can form a fabricated trend.","mechanism_slug":"state_and_state_transition","role":"Associates every reference observation with the complete applicable facility and processing configuration."},{"counterfactual_removal":"Without preserved history, isolated acceptable checks cannot reveal persistent movement or acceleration toward loss of comparability.","mechanism_slug":"half_life","role":"Uses recurring checks matched to plausible condition-loss and response windows instead of assuming calibration remains indefinitely transferable."},{"counterfactual_removal":"Without warning and unacceptable bands, residual movement can be acknowledged repeatedly without initiating diagnosis or maintenance.","mechanism_slug":"threshold","role":"Translates persistent or accelerating deviations into staged replication, diagnosis, and governance triggers."},{"counterfactual_removal":"Without a governed return path, reference trends become an additional report rather than a condition-control loop.","mechanism_slug":"feedback","role":"Routes confirmed drift into recalibration, cleaning, repair, software rollback, data qualification, or repeated testing."},{"counterfactual_removal":"Without reference-article custody, setup provenance, checksums, and uncertainty controls, apparent drift may be caused by an altered reference or incomparable processing.","mechanism_slug":"data_integrity","role":"Protects comparability and distinguishes measurement-chain deterioration from uncontrolled reference changes."},{"counterfactual_removal":"Without named interpreters and decision owners, cross-cutting evidence can diffuse among facility, instrumentation, test, and design teams.","mechanism_slug":"accountability","role":"Assigns signal maintenance and validation while reserving operational and design-evidence decisions for existing authorities."}],"nearest_rivals":["Component calibration: verifies individual sensors or balances against specified tolerances, but does not necessarily detect small combined changes in the complete tunnel-to-result chain.","Pretest readiness checklist: confirms that required setup tasks were completed for a campaign, but lacks longitudinal reference behavior, trend interpretation, and deterioration thresholds.","Statistical process control on production measurements: tracks repeated output variation, whereas this intervention uses a stable aerodynamic reference to assess an experimental facility whose ordinary test articles continually change.","Test repeatability study: estimates dispersion under selected conditions, but is usually bounded in time and does not create an owned degradation-and-response loop across campaigns.","Post-test discrepancy investigation: diagnoses an already observed conflict, whereas the proposed loop seeks precursor movement while controlled repair remains possible."],"negative_tests":{"intervention_falsifier":"The sentinel is undermined if blinded adjudication finds that its warning trends do not correspond to independently confirmed facility, instrumentation, mount, or processing changes; if setup variability prevents reproducible reference signatures; or if existing calibration and readiness controls identify the same conditions no later.","problem_falsifier":"The problem is unsupported if historical cross-campaign discrepancies are attributable only to test-article differences or random shocks with no observable precursor, if the reference response remains stable across independently confirmed condition changes, or if the existing workflow already trends and acts on equivalent end-to-end evidence.","risks":["Reference-article handling or mounting variation may fabricate apparent deterioration.","Excessively sensitive bands may consume tunnel capacity through unnecessary replication and diagnosis.","An aggregate coefficient residual may hide a localized instrument or pressure-channel problem.","A stable reference result may provide false reassurance at operating points or load paths it does not exercise.","Software or correction-method changes may break comparability unless parallel reduction is retained during transition.","Warnings may be mistaken for proof that campaign data are invalid before controlled replication and engineering review.","Frequent checks may interfere with test schedules or encourage staff to bypass the procedure.","Detailed facility signatures and test configurations may require controlled access."],"strongest_counterevidence":"The facility may already operate an approved reference-article program that configuration-controls the full measurement chain, trends disaggregated residuals, uses owned warning thresholds, and links crossings to maintenance and data-governance decisions; if verified, this intervention supplies no missing loop."},"next_evidence_step":"Perform a bounded, read-only retrospective on one tunnel using no more than 12 existing campaigns that include calibration, checkout, or repeat-condition records. Before viewing maintenance and discrepancy outcomes, have the facility and instrumentation engineers reconstruct a prespecified set of reference residuals with configuration provenance. Compare candidate warnings against independently adjudicated maintenance findings, unexplained repeat-test conflicts, and the timing of existing controls. If an approved reference article and operating procedure already exist, run the sentinel nonbinding during three scheduled sessions without adding operating points or altering test decisions. Record analyst time, setup sensitivity, false alerts, missing provenance, and proposed responses, then stop for test-director review.","observable_state":"For each approved reference operating point and facility configuration, a time-stamped record shows reference force and moment residuals with uncertainty, balance-zero return and hysteresis, pressure-channel availability, flow-uniformity results, repeat-run dispersion, environmental corrections, mount and reference-article inspection state, calibration age, instrumentation map, reduction-software checksum, trend direction, rate, persistence and acceleration, current condition band, assigned owner, diagnostic actions, and disposition.","prior_art_status":"UNSEARCHED","problem":"A reusable wind-tunnel facility can gradually lose end-to-end measurement fidelity as balances creep, pressure channels degrade, mounts wear, surfaces foul, instrumentation is replaced, and data-reduction code changes. Individual elements may continue satisfying their tolerances, yet their combined response can shift enough to reduce comparability between campaigns. Because each campaign tests a different article and operating envelope, the shift can be mistaken for real aerodynamic behavior until repeated or downstream verification results conflict.","proposal_index":2,"remaining_contrastive_claim":"The testable contrast is that a configuration-controlled, recurring end-to-end reference signature can reveal actionable deterioration in aerodynamic evidence fidelity that component calibration, campaign checklists, isolated repeatability studies, and post-discrepancy investigations do not reveal as early. The contrast fails if existing controls detect and act on the same condition at the same or earlier session.","revision_record":{"claim_changes":[],"conceptual_changes":[],"evidence_changes":[],"operational_changes":[],"parent_version":null,"progress_targets_addressed":[]},"schema_version":1,"structural_mapping":[{"archetype_element":"Condition to preserve","domain_realization":"Stable, traceable response of the complete subsonic wind-tunnel measurement chain so aerodynamic results remain comparable across campaigns."},{"archetype_element":"Baseline and condition bands","domain_realization":"An approved reference article, setup, operating-point set, uncertainty treatment, and reduction version establish healthy, acceptable, warning, and unacceptable residual bands."},{"archetype_element":"Leading and lagging deterioration indicators","domain_realization":"Leading signals include balance-zero creep, hysteresis, correlated coefficient residuals, pressure-channel dropout, flow-profile movement, and mount-condition changes; lagging signals include irreproducible campaign results and downstream verification conflicts."},{"archetype_element":"Recurring inspection cadence","domain_realization":"Reference conditions are checked at campaign boundaries, after relevant maintenance or processing changes, and at an approved interval during extended campaigns."},{"archetype_element":"Trend interpretation","domain_realization":"Facility and test engineers examine direction, rate, persistence, acceleration, correlation, and configuration localization instead of reacting to a single residual."},{"archetype_element":"Thresholds and escalation","domain_realization":"Warning bands require replication and diagnosis; confirmed unacceptable drift enters existing test governance for an authorized disposition."},{"archetype_element":"Response pathway","domain_realization":"Governed responses include cleaning, component recalibration, mount repair, instrumentation replacement, software rollback, data qualification, repeated testing, or a temporary test pause."},{"archetype_element":"Recalibration","domain_realization":"False alerts, missed discrepancies, confirmed maintenance findings, reference setup sensitivity, and evolving facility configurations are used to revise signals, thresholds, and cadence."}],"title":"Reference-Article Drift Sentinel for Wind-Tunnel Evidence Fidelity","version":0}