{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.eagle-ii","code":"thing-q1078391","url":"https://ver.cy/models/thing/q1078391/","name":"Eagle II","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"In its light-aircraft usage, Eagle II denotes the Christen Eagle II, a two-seat, single-engine aerobatic biplane designed for construction from a kit; the registry name alone does not establish this intended sense.","purpose":"Enable an agent to recognise the registered Eagle II aerobatic aircraft design, evaluate evidence about an example's configuration and condition, and identify prerequisites for its use or maintenance.","scope":{"in":["Eagle II identity, design lineage and distinction from other aircraft named Eagle","Kit configuration, construction records and departures from the documented design","Aerobatic airframe, flight controls and engine-propeller integration","Loading, operating limitations and evidence supporting performance claims","Inspection applicability, condition assessment and prerequisites for return to service"],"out":["F-15EX Eagle II and unrelated Eagle-named aircraft","Complete models of the broader aerobatic-aircraft category","Independent specifications of engines, propellers and avionics","Ownership histories and flight logs except as evidence linked from individual aircraft","Pilot licensing, aerobatic instruction and competition rules as standalone subjects"],"boundaries":[]},"distinguishingFeatures":["Resolve identity through Q1078391 and Christen/Aviat documentation before accepting the name Eagle II; name matching alone is insufficient.","Check for the tandem-seat aerobatic biplane configuration documented in an official investigation. [AAIB Eagle II report](https://assets.publishing.service.gov.uk/media/5422fbdc40f0b61342000793/Christen_Eagle_II__G-EGUL_09-09.pdf)","Require Eagle II construction or identification records to distinguish it from visually similar aerobatic biplanes and related Eagle variants.","Compare the installed powerplant with the published Lycoming AEIO-360-A1D and Hartzell constant-speed propeller baseline; treat substitutions as configuration differences. [Aviat Eagle II specifications](https://aviataircraft.com/eagle-aircraft-kit/)"],"structure":{"bundles":[{"id":"eagle-identity-and-lineage","name":"Eagle identity and lineage","description":"Resolve the registered concept and the documentation that defines its boundaries.","layers":[{"id":"registered-referent","name":"Registered referent","description":"Connect the registry identifier to the intended aircraft design.","findings":[{"id":"identifier-over-name","name":"Identifier over name","description":"Record the evidence connecting Q1078391 to the Christen/Aviat design and retain the unresolved family boundary.","questions":[{"text":"Does Q1078391 represent the whole Christen/Aviat Eagle family or specifically the Eagle II variant?","id":"identifier-over-name-q01","kind":"boundary"},{"text":"Which original registry import record establishes the intended referent?","id":"identifier-over-name-q02","kind":"provenance"}]}]},{"id":"design-documentation","name":"Design documentation","description":"Track design names, document revisions and applicable support authority.","findings":[{"id":"applicable-eagle-baseline","name":"Applicable Eagle baseline","description":"Identify the documentation governing a kit or aircraft without assuming all production periods share one baseline.","questions":[{"text":"Which kit manuals and drawing revisions define this Eagle II configuration?","id":"applicable-eagle-baseline-q01","kind":"provenance"},{"text":"Who currently controls the relevant design documentation and technical support?","id":"applicable-eagle-baseline-q02","kind":"relation"}]}]}]},{"id":"kit-build-and-airframe","name":"Kit build and airframe","description":"Capture how a completed Eagle II relates to its kit design and structural evidence.","layers":[{"id":"construction-conformity","name":"Construction conformity","description":"Link construction evidence and modifications to the completed configuration.","findings":[{"id":"build-record-continuity","name":"Build record continuity","description":"Establish which assemblies follow the documented kit configuration and which require separate substantiation.","questions":[{"text":"Which builder records establish the identity and completion of each major assembly?","id":"build-record-continuity-q01","kind":"provenance"},{"text":"Which departures affect mass, balance, structural limits or inspection requirements?","id":"build-record-continuity-q02","kind":"boundary"}]}]},{"id":"biplane-structural-condition","name":"Biplane structural condition","description":"Organise evidence about the wings, fuselage, covering and bracing.","findings":[{"id":"structural-inspection-coverage","name":"Structural inspection coverage","description":"Require inspection evidence appropriate to the Eagle II's construction and aerobatic service history.","questions":[{"text":"Which instructions govern inspection of wing structure, fuselage joints, fabric and bracing?","id":"structural-inspection-coverage-q01","kind":"provenance"},{"text":"What evidence of impact, overstress, deterioration or repair requires specialist assessment?","id":"structural-inspection-coverage-q02","kind":"action"}]}]}]},{"id":"propulsion-and-aerobatic-systems","name":"Propulsion and aerobatic systems","description":"Represent the installed propulsion package and systems supporting aerobatic operation.","layers":[{"id":"engine-propeller-installation","name":"Engine-propeller installation","description":"Resolve the installed combination and its compatibility evidence.","findings":[{"id":"installed-package-applicability","name":"Installed package applicability","description":"Link engine, propeller and governor identities to their installation-specific restrictions.","questions":[{"text":"What engine, propeller and governor models are installed, and how do they compare with the documented Eagle II baseline?","id":"installed-package-applicability-q01","kind":"definition"},{"text":"Which documents establish compatibility and any combination-specific operating restrictions?","id":"installed-package-applicability-q02","kind":"provenance"}]}]},{"id":"fuel-and-oil-continuity","name":"Fuel and oil continuity","description":"Capture configuration and evidence for fuel delivery and lubrication during permitted attitudes.","findings":[{"id":"aerobatic-system-evidence","name":"Aerobatic system evidence","description":"Distinguish installed system capability from general claims about inverted flight.","questions":[{"text":"Which fuel and lubrication provisions are installed for aerobatic operation?","id":"aerobatic-system-evidence-q01","kind":"definition"},{"text":"What documented attitude, duration or pressure restrictions apply to that installation?","id":"aerobatic-system-evidence-q02","kind":"measurement"}]}]}]},{"id":"controls-loading-and-flight-envelope","name":"Controls, loading and flight envelope","description":"Connect cockpit configuration and loading to the aircraft's documented operating envelope.","layers":[{"id":"cockpit-and-control-integrity","name":"Cockpit and control integrity","description":"Describe installed controls, occupant provisions and inspection evidence.","findings":[{"id":"control-and-occupant-configuration","name":"Control and occupant configuration","description":"Record the relationship between seating, control access, restraint systems and canopy provisions.","questions":[{"text":"Which seats have flight and engine controls, and what occupancy restrictions apply?","id":"control-and-occupant-configuration-q01","kind":"definition"},{"text":"Which documented checks establish control continuity, restraint condition and canopy security?","id":"control-and-occupant-configuration-q02","kind":"action"}]}]},{"id":"conditional-operating-limits","name":"Conditional operating limits","description":"Separate nominal specifications from limits applicable to the actual aircraft.","findings":[{"id":"loading-dependent-envelope","name":"Loading-dependent envelope","description":"Attach loading, configuration and source conditions to every speed or manoeuvre limit.","questions":[{"text":"What mass and centre-of-gravity envelope applies to each permitted occupancy and operating category?","id":"loading-dependent-envelope-q01","kind":"measurement"},{"text":"Which document establishes applicable airspeed and load-factor limits, and distinguishes operational limits from structural test values?","id":"loading-dependent-envelope-q02","kind":"provenance"}]}]}]},{"id":"continued-airworthiness-and-use","name":"Continued airworthiness and use","description":"Determine the evidence needed for inspection, maintenance and operating eligibility.","layers":[{"id":"inspection-and-service-information","name":"Inspection and service information","description":"Map defects and service instructions to the installed Eagle II configuration.","findings":[{"id":"instruction-applicability","name":"Instruction applicability","description":"Track applicable service information by assembly identity, construction date and modification status.","questions":[{"text":"Which Eagle II service bulletins and component instructions apply to this configuration?","id":"instruction-applicability-q01","kind":"provenance"},{"text":"What inspection or authorised disposition is required after reported overstress, a hard landing or a propeller strike?","id":"instruction-applicability-q02","kind":"action"}]}]},{"id":"operating-authority","name":"Operating authority","description":"Link the aircraft to its jurisdiction-specific permissions and restrictions.","findings":[{"id":"evidence-for-proposed-use","name":"Evidence for proposed use","description":"Require current documents and applicable limitations before concluding that a proposed operation is permitted.","questions":[{"text":"Which authority-issued certificate, permit and operating limitations govern this completed Eagle II?","id":"evidence-for-proposed-use-q01","kind":"provenance"},{"text":"Does the proposed passenger carriage or aerobatic use satisfy those limitations and the documented aircraft condition?","id":"evidence-for-proposed-use-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-regional-variation-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of Eagle II this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Identify an aircraft as this kit-built aerobatic biplane from its features and registration.","Report its registration and airworthiness status from the civil aircraft register.","Describe its design and kit origins from documented sources."],"mustNot":["Operate or start an aircraft without the owner's authority and valid airworthiness.","Present a builder's modifications as standard specification.","Encourage aerobatics outside permitted airspace, altitude or pilot qualification.","Misstate its build quality or history in a sale."],"requiresHuman":["Signing off a kit-built aircraft as fit to fly.","Transferring the aircraft to another owner."]},"ethics":{"considerations":["Amateur-built aircraft depend on the care of their builders; honesty about build quality saves lives.","Aerobatic flying puts people on the ground at risk if done in the wrong place."],"affectedParties":["Pilots and passengers","People on the ground","Buyers of used aircraft"]},"owners":{"steward":"The registered owner; the civil aviation authority holds the register and airworthiness records.","roles":[],"masterSystems":["National civil aircraft registers"]},"relations":[{"target":"Q2312440","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.eagle-ii","Wikidata: Q1078391 (https://www.wikidata.org/wiki/Q1078391)"]},"properties":{"applicability":"required","items":["Design identity and documentation lineage: Registry identifier, manufacturer designation, kit documentation and revision","Construction conformity: Documented baseline; documented modification; undocumented departure; unresolved","Seating and control configuration: Seat count, seating arrangement and controls installed at each position","Installed propulsion configuration: Engine, propeller, governor and aerobatic fuel/oil system models","Airframe dimensions: Wingspan, length and height in m","Mass and balance envelope: Mass in kg; centre of gravity in mm from a stated datum; applicable loading category","Fuel availability: Total and usable capacity in L; approved fuel specification","Speed and manoeuvre limits: Airspeed in kt with IAS/CAS/TAS basis; load factor in g; loading and configuration conditions","Inspection and operating eligibility: Documented current; restricted; inspection due; unserviceable; unknown"]},"recognition":{"applicability":"required","items":["Small two-seat biplane with tandem seats under a bubble canopy.","Short, strong wings for aerobatics and a radial-style cowling on many examples.","The registration marks settle the individual aircraft."]},"capabilities":{"applicability":"required","items":["Match an aircraft or kit record to Eagle II documentation and flag conflicting identities.","Compare a completed aircraft's configuration with its documented design baseline.","Identify missing loading, limitation or inspection evidence before assessing a proposed use.","Route an observed defect to the applicable airframe, engine or propeller instructions.","Check whether a service bulletin applies to a particular component or construction revision.","Prepare an evidence-backed maintenance or airworthiness review for an authorised person."]},"hazards":{"applicability":"required","items":["Structural overload during aerobatics beyond design limits.","Build errors in a kit-built aircraft.","Loss of control at low height during display flying."]},"interfaces":{"applicability":"required","items":["Convention on International Civil Aviation (Chicago Convention), International Civil Aviation Organization."]},"context":{"applicability":"required","items":["This two-seat aerobatic biplane is encountered in recreational aviation, aerobatic training, competitions and air displays.","Its kit-built construction makes the records, equipment and condition of each individual aircraft important when assessing suitability for flight or maintenance.","The second seat permits an instructor or passenger to accompany the pilot when the aircraft configuration and operating limitations allow."]}},"sources":[{"title":"Wikidata item Q1078391: Eagle II","url":"https://www.wikidata.org/wiki/Q1078391","note":"identity and sense of the item"},{"title":"Wikipedia: Aviat Eagle","url":"https://en.wikipedia.org/wiki/Aviat_Eagle","note":"general description of the item"}],"openQuestions":["Does the registry intend the two-seat Eagle II specifically, or the broader Christen/Aviat Eagle family represented by Q1078391?","Which organisation currently holds the design rights and supplies authoritative manuals, parts and service information?","Which primary documents reconcile published structural and operational load-factor figures and their loading conditions?","Which kit revisions and common modifications materially change inspection requirements or the operating envelope?","Which approval categories and authority-issued limitations apply to completed examples in the jurisdictions the catalogue must support?"],"resources":{"spec":"/models/things/publications/thing-q1078391/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1078391/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:23:44Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:25+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}