{"actors":["Mechanical design engineer responsible for the enclosure and mount geometry","Test engineer responsible for thermal-vibration records and instrumentation limits","Materials and manufacturing engineers responsible for alloy, machining, and fastener conformity","Independent design-review chair who owns the explanation record","Material Review Board and product-safety authority that control hardware disposition and safety-significant changes"],"affected_objective":"Select design-investigation and redesign work that addresses the cause of coupled-load cracking while preserving traceability, reversibility, and safety authority.","arm":"COMMON_P1","authority_safety":{"authorized_first_step":"The design-review chair may authorize document review, comparison of existing sensor traces, and non-destructive inspection of two explicitly quarantined non-flight assemblies under approved handling procedures.","decision_authority":"The explanation owner may rank hypotheses and recommend reversible probes; the Material Review Board controls hardware disposition, the responsible design authority controls drawing changes, and the product-safety authority controls any change affecting a safety requirement or certified configuration.","excluded_actions":["Treating the working explanation as proof of root cause","Releasing, scrapping, disassembling, destructively testing, or returning quarantined hardware to service","Changing drawings, material specifications, fastener torque, inspection requirements, or qualification criteria on the explanation owner's authority alone","Assigning individual fault or supplier liability from the provisional explanation","Suppressing a high-impact rival because it scores lower on parsimony"],"halt_rollback":"Halt the probe if quarantine boundaries, configuration identity, calibration validity, or safe handling cannot be confirmed. Preserve the original records and hardware state, mark the explanation unresolved, and route any discovered safety-significant nonconformance to the Material Review Board and product-safety authority."},"baseline":"After a qualification anomaly, engineers discuss likely root cause in an incident meeting and open an engineering-change request around the first credible account. Evidence, interpretation, rejected rivals, confidence limits, and predictions are distributed across minutes, test plots, and individual notes rather than bound to the change request.","candidate_id":"abductive_explanation_selection__engineering_design__COMMON_P1","causal_chain":["A combined thermal-vibration qualification produces fluorescent-penetrant indications at two enclosure mounting bosses, shifted fastener witness marks, and a late-cycle strain discontinuity, while a vibration-only sister assembly has no recorded indication.","Because the physical cause is hidden and several mechanisms can produce overlapping traces, participants interpret the same records as proof of their familiar failure mode.","An early interpretation can become embedded in an engineering-change request before credible rivals and instrumentation limitations are recorded.","The explanation gate separates the fixed observation record from interpretations and bounds the explanandum to why indications appeared at those bosses during the combined test.","A cross-functional reviewer set compares preload-loss joint slip, restrained thermal expansion, machining or material defects, inspection or sensor artifact, and a configuration nonconformance against coverage, timing, mechanism, missing evidence, anomalies, and required ad hoc assumptions.","Joint slip following preload loss may be labeled the action-limited working explanation only if its witness-mark, strain-phase, and location predictions materially distinguish it from the nearest rivals; otherwise the record preserves a ranked tie.","The working explanation authorizes only a non-destructive, configuration-preserving probe and carries explicit observations that would strengthen, weaken, or overturn it.","Probe results update the explanation log before any redesign or disposition decision, allowing the proper authority to act on an auditable explanation without treating it as settled fact."],"cell_id":"abductive_explanation_selection__engineering_design","consequence":"A design change can remove material, add stiffness, alter preload, or change inspection at the wrong locus, while the actual coupled-load mechanism remains unexamined; the anomaly record also becomes difficult to revise because the chosen interpretation has been incorporated into the design rationale.","diversity_from_prior_proposals":"Not assessed against prior proposals because runtime isolation forbids inspecting them; this candidate is specifically instantiated as a pre-engineering-change explanation gate for physical cracking under coupled thermal and vibration loads.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Add a mandatory Design-Anomaly Explanation Gate before a safety-relevant engineering-change request may cite a root cause. For the coupled-load crack case, the gate creates an immutable observation section; defines the explanandum; records a bounded candidate set containing the favored account, base-rate-common accounts, an instrumentation rival, and a low-probability high-impact configuration rival; and compares them in a signed fit matrix. The initial candidate set is preload-loss joint slip with load redistribution, restrained thermal expansion, machining or alloy defect, penetrant or strain-instrument artifact, and wrong fastener material or configuration. The gate may output an action-limited working explanation or an unresolved ranked tie. Each output must identify the nearest rival, discriminating predictions, authorized actions, revision triggers, and the authority required for redesign or disposition.","mechanism_mapping":[{"counterfactual_removal":"Without the matrix, reviewers can favor different explanations using implicit criteria, and the selected account has no auditable reason for outranking its nearest rival.","mechanism_slug":"inference_to_best_explanation_matrix","role":"Compares every candidate against the same evidence-coverage, timing, mechanism-plausibility, anomaly, missing-evidence, and ad-hoc-assumption criteria."},{"counterfactual_removal":"Without the case memo, observations, interpretations, confidence, and action limits can be scattered across records and silently change during handoff.","mechanism_slug":"explanatory_case_memo","role":"Binds the explanandum, direct observations, candidate ranking, defeasibility label, explanation owner, and authority boundary to the engineering-change record."},{"counterfactual_removal":"Without a disconfirming probe, investigation can accumulate supporting detail while leaving observationally similar rivals untouched.","mechanism_slug":"disconfirming_probe_plan","role":"Derives trace-level outcomes that distinguish preload-loss joint slip from restrained thermal expansion, material defects, and measurement artifacts."},{"counterfactual_removal":"Without the log, a later ranking can overwrite the earlier rationale, hiding failed predictions and ad hoc repairs to the favored account.","mechanism_slug":"abduction_log","role":"Records each evidence-triggered change to the candidate set, ranking, confidence label, and permitted action."}],"nearest_rivals":["Conventional root-cause analysis that names one cause and corrective action after an incident review","Fault-tree analysis that starts from a defined top event and decomposes combinations of known failure paths","Design of experiments that varies selected factors after testable factor hypotheses have already been chosen","Failure Modes and Effects Analysis that prospectively catalogs component failure modes rather than explaining one anomalous trace set"],"negative_tests":{"intervention_falsifier":"The gate is falsified as the operative intervention if independent reviewers using its completed records cannot identify the fixed observation, nearest rival, selection rationale, confidence label, permitted action, and an observation that would overturn the leader; it is also falsified if the first probe cannot distinguish the leader from any recorded rival.","problem_falsifier":"The stated problem is falsified if existing qualification and change-control records already keep observations separate, compare credible rivals with explicit criteria, preserve unresolved ties, bind action to confidence, and record revision triggers before a cause-dependent change is authorized.","risks":["Fit scores may create false precision or launder a preferred narrative.","The candidate set may omit a compound mechanism, allowing a tidy but incomplete winner.","Reviewers may anchor on the initial leader even when the label says provisional.","The gate may delay urgent containment if containment and causal redesign authority are not kept separate.","Supplier or operator attribution may escape the action-confidence boundary through informal communication.","Instrumentation limitations may make all candidates observationally equivalent, producing procedural work without a defensible selection."],"strongest_counterevidence":"Pre-test inspection records showing the same boss indications, with no witness-mark movement and no load-correlated strain discontinuity after correction for sensor drift, would undermine the proposed joint-slip account and suggest that the observed traces do not share its predicted event sequence."},"next_evidence_step":"On one quarantined anomalous non-flight assembly and one configuration-matched unaffected sister assembly, conduct a single document-and-NDI comparison: blind-review pre-test and post-test penetrant images, torque-witness photographs, configuration records, calibration records, and synchronized temperature, acceleration, and strain traces. Before review, register three discriminators: joint slip predicts a step or phase change coincident with witness-mark movement; restrained thermal expansion predicts strain tracking temperature before vibration amplitude changes; a pre-existing defect or inspection artifact predicts indications not tied to either event pattern. Do not retest, disassemble, alter torque, or change a drawing. End after the signed comparison memo and either update the ranking or declare the tie unresolved.","observable_state":"A gate record attached to the anomaly contains timestamped raw observations and provenance; a separately labeled interpretation section; the exact explanandum; a candidate-by-criterion matrix; the nearest-rival comparison; the output label \"action-limited working explanation\" or \"unresolved tie\"; predicted and surprising traces for each live candidate; named explanation owner; permitted-action boundary; revision triggers; and links to each subsequent evidence update.","prior_art_status":"UNSEARCHED","problem":"A physical enclosure develops localized mounting-boss indications during combined thermal-vibration qualification. The team must decide what to inspect or redesign before the hidden mechanism is established, but current change-control artifacts allow the first plausible story—such as insufficient boss strength—to merge with the observation record and displace joint-slip, thermal-restraint, manufacturing-defect, instrumentation, or configuration explanations.","proposal_index":1,"remaining_contrastive_claim":"Unlike root-cause reporting, fault-tree decomposition, prospective failure-mode cataloging, or a factor experiment, the proposed gate operates before a cause-dependent design change by requiring one anomalous trace set to support an explicit best-so-far explanation over a named rival—or remain a tie—and by limiting that explanation to reversible inquiry until its discriminating prediction is observed.","revision_record":{"claim_changes":[],"conceptual_changes":[],"evidence_changes":[],"operational_changes":[],"parent_version":null,"progress_targets_addressed":["Concrete engineering explanandum with observation separated from interpretation","Bounded candidate set including common, high-impact, and action-changing rivals","Explicit explanatory-fit comparison and tie rule","Defeasibility label, revision triggers, and action-confidence boundary","Bounded non-destructive first evidence step"]},"schema_version":1,"structural_mapping":[{"archetype_element":"Surprising Observation Record","domain_realization":"Penetrant indications at two mounting bosses, shifted fastener witness marks, and a late-cycle strain discontinuity after combined thermal-vibration testing, recorded separately from causal language."},{"archetype_element":"Explanandum Boundary","domain_realization":"Explain why the indications emerged at those bosses during the combined test, without expanding the claim to all enclosure durability or assuming a shared cause for every trace."},{"archetype_element":"Candidate Explanation Set","domain_realization":"Preload-loss joint slip, restrained thermal expansion, machining or alloy defect, inspection or sensor artifact, and fastener configuration nonconformance."},{"archetype_element":"Explanatory Fit Criteria","domain_realization":"Coverage of indication location, witness-mark movement, trace timing, thermal phase, vibration response, known load paths, missing pre-test evidence, instrumentation limits, and required ad hoc assumptions."},{"archetype_element":"Best-So-Far Explanation or Tie","domain_realization":"Joint slip after preload loss is an action-limited working explanation only if it distinguishes itself on the registered traces; otherwise multiple candidates remain ranked and live."},{"archetype_element":"Defeasibility Status Label","domain_realization":"The design record displays \"action-limited working explanation\" and prohibits cause-dependent redesign authority from being inferred from that label."},{"archetype_element":"Discriminating Evidence Plan","domain_realization":"A blind comparison of existing images, witness marks, configuration records, calibration evidence, and synchronized load traces tests mutually distinguishing event patterns without changing the hardware."},{"archetype_element":"Revision Trigger","domain_realization":"Reopen or replace the explanation if witness marks are stable, corrected strain lacks the predicted discontinuity, indications predate the test, thermal phase favors restraint, configuration differs, or a compound mechanism fits without the leader's exceptions."}],"title":"Design-Anomaly Explanation Gate for Coupled-Load Mount Cracking","version":0}