C-9
Enable an agent to recognise a C-9 aircraft, distinguish its variant and configuration, assess its recorded condition, and identify the evidence needed for an intended transport role.
Bundle → Layer → Finding → Questions Filled
5 bundles · 9 layers · 14 findings · 22 questions
Designation and lineage Resolve what C-9 means and identify the applicable aircraft variant.
Registry referent
Connect the registry label to a documented aircraft concept.
Designation resolution
Treat the McDonnell Douglas interpretation as provisional until the registry source confirms it.
- Which source identifier and designation authority establish what vr.tr.c-9 denotes? provenance
- Does this entry denote the C-9 family, a particular variant, or a different use of C-9? boundary
Variant applicability
Associate a recognized C-9 variant with its design baseline and technical evidence.
Variant evidence
Keep variant designation, popular name and installed modifications separately identifiable.
- Which records establish the variant and its relationship to the underlying DC-9 design? provenance
- Which capabilities belong to that variant, and which require an additional documented modification? boundary
Transport cabin and loading Describe the approved carrying arrangement and the physical path for loading it.
Occupant and patient layout
Identify seating, patient positions and mission-equipment dependencies.
Approved cabin arrangement
Record each approved layout without merging passenger and patient maxima.
- How many seats, litter positions and attendant positions are approved in the installed arrangement? measurement
- Which oxygen, electrical, access and restraint provisions must be verified before accepting a proposed aeromedical fit? action
Cargo access and restraint
Relate payload dimensions and mass to actual door, floor and attachment provisions.
Load-path compatibility
Require configuration-specific evidence for loading and securing cargo or mission equipment.
- What door openings, loading heights and interior clearances constrain the proposed load? measurement
- Which approved floor limits and restraint arrangements apply to its mass and position? provenance
Flight envelope and systems Connect installed aircraft systems with the limits governing a proposed transport mission.
Propulsion and cabin services
Identify installed engines and the systems supporting flight and cabin use.
Installed system baseline
Tie propulsion, pressurization and cabin-service capability to applicable configuration documents.
- Which engine models and approved modifications define the aircraft's performance baseline? provenance
- Which cabin-pressure, electrical or environmental limitations constrain the intended passenger or patient mission? action
Payload, fuel and runway
Record the coupled constraints on load, fuel and airfield suitability.
Mission envelope evidence
Keep performance values attached to their flight-manual assumptions and revision.
- What mass, balance and fuel limits apply to the proposed cabin layout and load? measurement
- Which approved performance data support the required route and runway under the stated conditions? provenance
Continued use and disposition Assess whether a particular C-9 can support the intended activity using dated technical and authority records.
Airframe and equipment condition
Connect accumulated usage and recorded defects to applicable inspection and maintenance requirements.
Maintenance applicability
Identify relevant structural, engine and mission-equipment obligations without asserting undocumented defects.
- What recorded flight hours, cycles, storage history and inspection results determine the applicable C-9 maintenance tasks? measurement
- Which unresolved defects, life limits or mandatory instructions restrict the intended use? action
Authority and lifecycle state
Distinguish flight authorization from storage, preservation and display status.
Permitted-use evidence
Require current, operator-specific evidence before recommending an operational action.
- Which military or civil authority, governing documents and release records apply to this aircraft's present operation? provenance
- Does its documented disposition permit flight, ground operation, towing, cabin access or static display only? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of C-9 this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these kinds and varieties hold for the sense of C-9 this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of C-9 this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of C-9 this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of C-9 this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of C-9 this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
- Other names and narrower kinds
- McDonnell Douglas C-9B Skytrain II, C-9K, VC-9C, C-9A Nightingale
What it is Filled
C-9 is a United States military aircraft designation for adaptations of the McDonnell Douglas DC-9 twin-engine jet airliner used for aeromedical evacuation and transport.
In scope
- C-9 designation evidence, manufacturer lineage and variant identification
- Variant-specific passenger, cargo, aeromedical and special-mission configurations
- Installed propulsion, cabin systems and loading interfaces
- Configuration-dependent payload, balance and operating limitations
- Aircraft condition, maintenance evidence and authorized uses
Out of scope
- Other objects or aircraft assigned the designation C-9 under different naming systems
- The complete civil DC-9 family and its airline operations
- Individual aircraft identity, ownership and maintenance logs as independently maintained records
- Patient diagnosis, treatment and clinical transport decisions
- Airport infrastructure, air traffic control and flight-crew qualification models
Why it exists Filled
Enable an agent to recognise a C-9 aircraft, distinguish its variant and configuration, assess its recorded condition, and identify the evidence needed for an intended transport role.
Distinguishing features Filled
- Require designation or manufacturer records establishing the military C-9 relationship to the DC-9; a similar appearance or a name containing '9' is insufficient. [NASA C-9B](https://espo.nasa.gov/aircraft/C-9B)
- Use twin jet engines, swept wings and a T-tail as supporting recognition features, then require documentary identification because the civil DC-9 shares the family appearance. [US Air Force C-9 description](https://www.af.mil/News/Article-Display/Article/133275/historic-c-9-heads-to-andrews-for-retirement/)
- Distinguish the C-9A aeromedical role from other C-9 configurations using the variant designation and installed patient-handling equipment. [Air Force Medical Service C-9A history](https://www.airforcemedicine.af.mil/News/Display/Article/1459865/the-cadillac-of-medevac-the-c9as-lasting-mark-on-the-aeromedical-evacuation-sys/)
- Recognise Skytrain II as the Navy's C-9B variant name; do not use that name as proof that every C-9 has the same cabin equipment or mission. [NAVAIR C-9 history](https://www.navair.navy.mil/node/21446)
What robots and AI may and may not do Filled
Must not
- Recommend flight, loading or patient transport without current airworthiness and configuration records.
- Make clinical decisions about patients transported on board.
- Confuse the C-9 designation with unrelated uses of the same code.
- Share operational details of military flights beyond public records.
Only with a human decision
- Approving the aircraft for an aeromedical mission or a conversion.
- Any decision about moving a patient by air.
May
- Identify a C-9 aircraft and its variant from serial number and documentation.
- Report its configuration and status from official records.
Moral aspects Filled
- Aeromedical evacuation carries sick and wounded people whose lives depend on safe operation.
- Military flight details can put crews and passengers at risk if disclosed.
Who is affected
- Patients and medical crews
- Aircrew
- Service members
Owners Filled
Steward
The military operator; the national military aircraft register holds its record.
Master systems
- Military aircraft serial registers
Links to other meta-models Filled
parent
- Q15628497 - registry parent class
- Q75135839 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.c-9
- Wikidata: Q3686766 (https://www.wikidata.org/wiki/Q3686766)
Direct properties required Filled
- Designation and identification confidence: Recorded designation, naming authority and era; confirmed, provisional or conflicting
- Variant and parent design: Documented C-9 variant linked to its applicable DC-9 design baseline
- Installed cabin configuration: Passenger, cargo, aeromedical, mixed or documented special configuration
- Approved occupant and patient capacity: Number of crew positions, passenger seats, litter positions and ambulatory-patient positions, per approved layout
- Mass and centre-of-gravity limits: kg or lb; centre of gravity in percent mean aerodynamic chord or the manual's specified datum
- Loading geometry and restraint limits: Door clearances in mm or in; floor loading in kPa or lb/ft²; restraint ratings in the approved document's units
- Installed engine configuration: Engine model, installation approval and applicable operating-limit document
- Mission performance basis: Range in nmi or km; runway requirement in m or ft, with payload, fuel, weather and runway assumptions
- Technical and operational disposition: Unknown, serviceable, restricted, maintenance, stored, retired or static display; dated authority evidence recorded separately
Recognition required Filled
- A twin-jet airliner shape with engines mounted on the rear fuselage and a T-tail.
- Military markings and serial numbers, and on aeromedical versions red cross markings.
- A large forward cargo door on some variants.
Capabilities and actions required Filled
- Classify a candidate aircraft against documented C-9 identity and variant evidence.
- Compare an installed cabin layout with a proposed passenger, cargo or aeromedical requirement.
- Screen proposed loads against documented access, restraint, weight and balance constraints.
- Identify configuration-specific technical manuals and unresolved maintenance dependencies.
- Flag missing evidence that prevents recommending flight, loading, conversion or ground handling.
- Separate historical mission capability from the aircraft's currently documented permitted uses.
Hazards and failure modes required Filled
- Ageing airframes need strict maintenance to stay airworthy.
- Improperly secured medical equipment or litters can endanger patients.
Standards and interfaces required Filled
- The United States Department of Defense Mission Design Series designation system classifies C-9 aircraft within the cargo and transport mission category.
Context of use required Filled
- The C-9 family served military aeromedical evacuation and passenger or logistical transport roles.
- Historical records, preserved aircraft and maintenance documentation distinguish medical evacuation configurations from other transport variants.
Sources Filled
- Wikidata item Q3686766: C-9 - identity and sense of the item
- Wikipedia: McDonnell Douglas C-9 - general description of the item
Open questions
- Does the registry's original source identify the McDonnell Douglas C-9, and what is that source's persistent identifier?
- Does an existing Vercy world model already own this aircraft concept, requiring a link instead of a second model?
- Which variants, including any VC-prefixed derivatives, belong within this registry entry's authoritative boundary?
- Which authoritative manuals establish variant-specific dimensions, capacities, engine installations, performance limits and approved cabin arrangements?
- Which operator-specific maintenance programs, mandatory instructions and operating authorities govern any individual aircraft being assessed?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q3686766/spec.json