parachute
Enable an AI agent to recognise a parachute, assess its configuration and readiness, and identify permitted uses or required interventions from evidence about its deployment, aerodynamic function and load compatibility.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a parachute, assess its configuration and readiness, and identify permitted uses or required interventions from evidence about its deployment, aerodynamic function and load compatibility.
A parachute is a deployable aerodynamic decelerator whose textile canopy, once inflated, produces drag and, in ram-air designs, lift, so that a person, cargo, vehicle or returning spacecraft can be slowed, stabilized or steered through an atmosphere after release, ejection or re-entry.
It can be Identify the parachute and reconcile its installed components with a documented configuration.; Compare an intended load and deployment scenario with the applicable operating envelope.; Request or record inspection, packing and maintenance by an appropriately authorised person.; Identify missing deployment dependencies, incompatible attachments or unresolved condition evidence.; Track deployment and recovery observations for subsequent condition assessment.; Flag restrictions, quarantine or retirement when supported by applicable instructions and findings..
Distinguishing features
Determine whether its documented role is to deploy an aerodynamic surface to decelerate or control descent of an attached load, rather than merely cover, contain or protect it.
Look for an identifiable load path from the aerodynamic surface through suspension or equivalent attachments to the supported person, payload or vehicle.
Distinguish a ram-air parachute from a similar-looking paraglider by its documented deployment method and intended operating role, rather than canopy shape alone.
Distinguish a complete parachute assembly from a canopy, pilot chute or deployment bag sold or recorded as a component.
Distinguish a standalone drogue parachute from a drogue that functions only as a deployment component by checking its assigned role and system boundary.
Scope
+ Parachute identity, intended role and assembly boundaries
+ Canopy geometry, suspension arrangement and control features
+ Deployment method, opening sequence and deployment dependencies
+ Documented operating envelope and compatibility with the supported load
+ Packing, inspection, damage, maintenance and readiness evidence
- Aircraft or spacecraft design beyond parachute installation and deployment interfaces
- Jumper competence, health and licensing
- Payload design beyond attachment, mass and deployment constraints
- Weather forecasting, terrain assessment and landing-zone management
- Paragliders, kites and other aerodynamic devices whose primary function is outside the recorded parachute role
- Complete mission planning and emergency procedures owned by the operator or host system
Characteristics
- Parachute role
- Personnel main; personnel reserve; cargo descent; vehicle braking; recovery; drogue; other documented role Determines which deployment, performance and readiness questions apply.
- Canopy construction
- Recorded geometry, aerodynamic form, material and porosity specification where available Helps identify the design and interpret its inflation, drag and control behaviour.
- Canopy reference area
- m², with the manufacturer's area convention recorded Supports comparison and loading calculations without treating incompatible area conventions as equivalent.
- Attached load
- Person, payload or vehicle, including its attachment configuration Connects suitability decisions to the actual supported system.
- Total supported mass
- kg, with included equipment and assembly mass explicitly identified Allows the intended configuration to be checked against documented loading limits.
- Deployment method
- Recorded initiation and extraction method, including manual, static-line or automatic dependencies where fitted Identifies what must initiate deployment and which components must operate together.
- Documented operating envelope
- Applicable evidence for mass, deployment speed, altitude, environmental and configuration limits Bounds suitability claims and prevents extrapolation beyond the evidence.
- Steering and descent controls
- None documented; passive stabilisation; active steering or braking, with mechanism specified Determines whether directional or descent adjustments are available to an operator or controller.
- Physical and packing state
- Unpacked; packed; deploying; inflated; collapsed; damaged; unknown, with separate condition observations Distinguishes current physical configuration from permission to use.
- Serviceability determination
- Undetermined; released for a specified use; restricted; quarantined; retired, with evidence and responsible authority Prevents appearance or packing status alone from being treated as proof of readiness.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.parachute
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 30 questions.
Identity and aerodynamic role Establishes what parachute is represented and what deceleration or descent function it serves.
Similar canopies and deployment components can represent different things with different permitted uses.
Assembly identity
Identifies the represented unit and separates it from its components and host system.
Traceable assembly boundary
Record identifying marks and the components included in this parachute instance.
- Which manufacturer, model, serial number and configuration identifiers establish this parachute's identity? provenance
- Does this instance include the canopy alone, or also suspension, risers, deployment equipment, container and harness? boundary
Intended function
Separates the parachute's assigned role from resemblance to neighbouring aerodynamic devices.
Documented parachute role
Record the intended deceleration or descent function and whether the unit acts independently or within another parachute system.
- Is this parachute intended for personnel descent, cargo delivery, braking, recovery, drogue service or another specified function? definition
- What documentation distinguishes its role from a paraglider, kite or auxiliary deployment component? boundary
Canopy, suspension and control Describes the aerodynamic surface and how its forces reach and influence the attached load.
Parachute recognition and condition assessment depend on canopy form, suspension continuity and the specific means of control.
Aerodynamic surface
Records canopy construction and the geometry against which its condition can be assessed.
Canopy configuration
Capture the design-specific arrangement of panels, cells, vents or slots and its reference dimensions.
- Which canopy form, materials and inflation or airflow features define this design? definition
- What are its documented area and principal dimensions, and which measurement conventions apply? measurement
Force transmission and controls
Records suspension routing, attachment interfaces and any steering or braking mechanism.
Load path and control continuity
Establish the intended connections from canopy to load and the configuration of any control lines or actuators.
- How are canopy forces transmitted through lines, connectors and risers or equivalent parts to the attached load? definition
- Which inspection evidence establishes correct suspension routing, attachment security and control configuration? provenance
Deployment and inflation Models the transition from stowed assembly to a functioning aerodynamic surface.
A parachute can be intact yet unusable because its initiation, extraction or inflation dependencies are absent or incorrectly configured.
Initiation and extraction
Identifies the trigger and components responsible for releasing and extracting the canopy.
Deployment dependency chain
Record the specified initiating event and the linked release, extraction and sequencing components.
- What initiates deployment, and which fitted components must act between initiation and canopy extraction? definition
- What configuration checks and authorisations are required before those deployment components may be armed or used? action
Opening sequence
Records the design-specific progression toward inflation and evidence of abnormal opening.
Inflation progression
Represent expected deployment stages and observed deviations without assuming that canopy extraction establishes successful opening.
- Which stages, including any reefing or staged inflation, define the documented opening sequence? definition
- What observations establish completed inflation, and what evidence records incomplete, delayed or asymmetric opening? measurement
Load and operating envelope Connects the intended load and deployment conditions to configuration-specific performance evidence.
A parachute's suitability depends on the supported mass, attachments and deployment conditions together.
Supported load compatibility
Establishes the actual load and its mechanical compatibility with the parachute.
Mass and attachment fit
Record supported mass, attachment arrangement and evidence that the combination is permitted.
- What total mass will be supported, and which person, equipment, payload and parachute components are included in that value? measurement
- Which documentation supports compatibility of this parachute with the proposed harness, payload fittings or vehicle attachment? provenance
Performance and use limits
Separates demonstrated or authorised operating conditions from unsupported expectations.
Configuration-specific envelope
Record applicable operating limits and performance evidence with their test conditions and uncertainties.
- What source establishes the permitted deployment conditions and loading limits for this exact configuration? provenance
- What descent, opening-load, drag or glide measurements are available, and under what mass and environmental conditions were they obtained? measurement
- Does the intended use satisfy every applicable limit, or must suitability remain undetermined? action
Condition, packing and release Connects material condition, packing history and service records to a bounded readiness determination.
Packed appearance cannot establish parachute serviceability, and different roles can impose different inspection and release requirements.
Material condition and history
Records damage, exposure, repairs and use events relevant to the canopy and deployment assembly.
Condition evidence
Track observed defects and relevant history against design-specific inspection and retirement criteria.
- What inspection findings document canopy fabric, seams, suspension lines, connectors and fitted deployment components? measurement
- What records exist for deployments, unusual opening loads, contamination, moisture exposure, repairs and component replacements? provenance
- Which applicable criteria require further inspection, repair, quarantine or retirement? action
Packing and serviceability
Records how the assembly was prepared and who established its current permitted-use status.
Bounded readiness determination
Link packing and release evidence to a particular configuration and use, retaining unresolved prerequisites.
- Who packed and inspected the parachute, when, under which instructions, and with what recorded configuration or seal evidence where applicable? provenance
- What applicable checks, service intervals and unresolved discrepancies determine whether this assembly may be released for its intended use? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Round personnel parachute (flat, conical, tri-conical or cruciform troop and emergency canopies)
- Ram-air (square) personnel parachute
- Reserve parachute (second canopy in a dual assembly)
- Emergency/bailout parachute (aircrew, single-harness emergency assembly)
- Cargo/aerial-delivery parachute (including GPS-guided ram-air airdrop systems)
- Extraction parachute (pulls a load from an aircraft)
- Drogue parachute (towed stabilizer/speed regulator)
- Deceleration/drag parachute (aircraft or vehicle braking after landing or high-speed run)
- Which of these kinds and varieties hold for the sense of parachute this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- NATO NSN / U.S. Federal Supply Class - 1670-xx-xxx-xxxx (FSC 1670: parachutes; aerial pickup, delivery and recovery systems) - Example from current U.S. Army secondary-item lists: 1670-01-063-3715 (15 ft extraction parachute).
- FAA TSO marking - TSO-C23b | TSO-C23c | TSO-C23d | TSO-C23f - Personnel parachute assemblies and components sold as civil appliances carry the applicable TSO-C23 series mark; military types may instead be drawing-controlled.
- U.S. Army type designation - T-11 | MC-6 | RA-1 (personnel); G-11 | G-12 | G-14 | G-15 | G-16 (cargo) - In-service nomenclature in ATP 4-48 and the TM 10-1670 series, not a civil product code.
- PIA TS-100 ram-air part names - Standardized component names (cells, ribs, lines, slider, risers, etc.) rather than a single item code - The rigger-community vocabulary for ram-air canopies; does not by itself identify a particular assembly.
- Which of these identifiers and schemes hold for the sense of parachute this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- FAA TSO-C23 (C23b via NAS-804; C23c/d via SAE AS8015; later C23f) - Personnel Parachute Assemblies and Components (Federal Aviation Administration)
- SAE AS8015 / AS8015B - Minimum Performance Standards for Parachute Assemblies and Components, Personnel (SAE International)
- NAS-804 - Specification-Parachutes, the TSO-C23b performance standard used 1949-1984 (National Aerospace Standards Committee)
- PIA TS-100 - Standardized Nomenclature for Ram-Air Inflated Gliding Parachutes (Parachute Industry Association)
- PIA TS-135 - Performance Standards for Personnel Parachute Assemblies and Components (Parachute Industry Association)
- PIA TS-136 - test standards for military personnel parachute assemblies and components (Parachute Industry Association)
- U.S. Army TM 10-1670 series and ATP 4-48 Aerial Delivery - packing, inspection and employment of in-service personnel, cargo, extraction and pilot parachutes (Department of the Army)
- Which of these standards and regulation hold for the sense of parachute this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Worn as a backpack or chair-type assembly by a skydiver: a ram-air main is deployed in freefall and a TSO'd reserve remains packed for malfunction.
- Issued to paratroopers for static-line exit from transport aircraft (U.S. T-11 and MC-6) or for military freefall/HALO-HAHO (RA-1 / MC-4 class ram-air systems).
- Worn by aircrew as an emergency/bailout parachute, packed to TSO-C23 limits and used only if the aircraft is abandoned.
- Attached to cargo platforms, CDS bundles or JPADS guided ram-air canopies to deliver supplies; G-12E/G-15 class canopies for loads up to about 2,200 lb, G-11/G-16 class singly from about 2,250 lb or clustered toward tens of thousands of pounds.
- Used as an extraction parachute to pull a load from the aircraft, including extracted CDS above about 150 KIAS.
- Streamed as a drogue behind a jumper, store, aircraft or capsule to set speed and attitude before the main canopy or landing.
- Deployed as a drag chute to shorten the landing roll of high-performance aircraft, or as a rocket-deployed whole-aircraft canopy (e.g. Cirrus CAPS) to bring airframe and occupants down together.
- Used in spacecraft recovery to slow capsules through Earth's atmosphere after re-entry.
- Which of these real-world use hold for the sense of parachute this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Rate of descent under a fully open personnel canopy - about 4.3-7.3 (14-24 ft/s); whole-aircraft recovery listed below about 8.5 (28 ft/s) - m/s
- Forward speed (ram-air personnel) - 0 for round/cruciform troop canopies; about 15-25 military ram-air; sport solo often below about 10-16; tandem about 15-20 - mph
- Packed assembly mass - about 7 sport solo; 12-17 military personnel (T-10/T-11 class 29-38 lb); about 14 tandem; whole-aircraft system on the order of 90 - kg
- Intended deployment / opening height AGL - static-line troop typically a few hundred to about 1,250; sport/tandem opening commonly above about 2,000; military freefall envelopes 2,000-30,000 - ft
- TSO qualification envelope (personnel) - Category B example 254 lb at 150 KIAS; older/higher categories up to 300 lb and 175-230 knots depending on the AS8015/TSO edition - lb and KIAS
- Cargo canopy diameter (common U.S. types) - about 34 (G-14); 64 (G-12E); 100 (G-11B); extraction canopies about 15-28 - ft
- Cargo load (single canopy or cluster) - G-12E/G-15 up to about 2,200 lb each; G-11 family from about 2,250 lb singly, clustered toward about 42,000 - lb
- Which of these typical measurements hold for the sense of parachute this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Hard opening / opening shock: rapid inflation produces peak loads that can injure the jumper or break lines, especially at high indicated airspeed.
- Pilot-chute in tow, bag lock or streamer: the canopy never inflates, so descent remains at freefall or near-freefall speed.
- Line-over, inversion or spinning malfunction of a ram-air canopy, requiring cutaway and reserve if altitude allows.
- Main and reserve both out (two-out), which can produce a downplane or entanglement.
- Horseshoe malfunction: part of the canopy or deployment bag remains snagged on the jumper or aircraft.
- Shroud-line entanglement with a spinning or damaged aircraft, a historically documented cause of failed bailout.
- Extraction-parachute hang-up: the load fails to leave the aircraft and can endanger the airframe.
- Landing injury from high descent rate, oscillation of a round canopy, or downwind/high-wind landing under a ram-air wing.
- Insufficient altitude to inflate (low jump, late pull, or static-line failure).
- Packing error, missed reserve repack interval, UV/moisture/fabric degradation, or failed automatic activation device.
- Which of these failure modes and hazards hold for the sense of parachute this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- United States civil gear is TSO-C23 marked and maintained by FAA-certified parachute riggers using PIA ram-air nomenclature; U.S. military personnel and cargo parachutes are drawing-controlled (T-11, MC-6, RA-1, G-series) under TM 10-1670 rather than TSO.
- Sport communities universally call ram-air canopies 'square' and treat a packed reserve as mandatory; military mass-exit still uses non-gliding round or cruciform troop canopies opened by static line at much lower altitude.
- Military versus civilian jump profiles differ sharply: static-line troop exits on the order of 500-1,250 ft AGL versus typical civilian freefall exits around 12,000-15,000 ft.
- Other civil authorities (for example Romanian RACR material) reproduce the FAA TSO-C23 series and PIA TS-100 rather than writing a separate canopy standard, so U.S. TSO language travels internationally even where the regulator is not the FAA.
- The word itself is a French coinage (para- + chute, 1785); English 'parachute', French 'parachute' and similar European forms name the same device, while practitioners still split 'round' versus 'square' in everyday speech.
- Which of these regional variation hold for the sense of parachute this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- paraglider - A paraglider is foot- or tow-launched and flown as a soaring aircraft from the start of the flight; a parachute is packed and deployed to decelerate or recover a load already falling or flying. Shared ram-air construction does not make a paraglider a personnel parachute.
- pilot chute - A pilot chute is a small deployment aid that extracts the main or reserve canopy from its container; it is not the load-bearing decelerator. PIA treats it as a deployment-initiation device, not as the parachute assembly.
- drogue parachute versus extraction parachute - A drogue is towed to regulate speed and attitude of a falling body; an extraction parachute is sized and rigged to pull cargo out of an aircraft. Same family of small canopies, different job and load path.
- foil kite / traction kite - A kite remains tethered to the ground, a board or a vessel and is not a certified personnel decelerator; a parachute's load is the falling person or store itself, not a ground anchor.
- whole-aircraft ballistic recovery system - Still a parachute, but rocket-extracted and attached to the airframe so the aircraft and occupants descend together (Cirrus CAPS class); a personnel parachute is worn by the occupant who has left the aircraft.
- hang glider - A hang glider is a rigid or flex-wing aircraft launched into sustained flight; it has no packed canopy inflation sequence and is not used as an emergency decelerator.
- wingsuit - A wingsuit is a fabric lifting garment worn in freefall; it does not replace the parachute, which the jumper still deploys to land.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of parachute this model covers, and on what evidence? provenance
Sources
- Parachute - Working definition (drag and lift), historical origin of the term, personnel/cargo/spacecraft/vehicle uses, and the distinction of the drogue as a braking/stabilizing parachute.
- TS-136: Test Standards for Military Personnel Parachute Assemblies and Components - Industry classification of single-harness main-and-reserve, multi-harness, and single-harness emergency assemblies; definition of a drogue as a towed aerodynamic decelerator; assembly makeup (canopy, harness, deployment bag, pilot chute/static line).
- Parachute Rigger Handbook, Change 1 (Appendix A: TSO-C23, SAE AS8015, PIA TS-100/TS-135) - Civil certification path TSO-C23b/c/d/f against NAS-804 then SAE AS8015; PIA TS-100 as the official ram-air parts nomenclature; persistence of round emergency canopies alongside square gliding canopies; military drawing-system certification versus TSO.
- ATP 4-48 Aerial Delivery - In-service U.S. personnel types T-11, MC-6 and RA-1; cargo types G-12E/G-15 and G-11/G-16 with cluster loads; extraction and pilot parachutes; airdrop velocity classes; JPADS as a steerable ram-air cargo system.
- How To Select An Emergency Parachute - Emergency parachutes and skydiving reserves as FAA appliances under TSO-C23; Category A/B/C weight and airspeed limits; round canopy shape families (flat, conical, tri-conical) used in emergency systems.
- Handbook of Aviation and Space Medicine - Practitioner split of round, square, cruciform, pilot and drogue canopies; tabulated packed mass, forward speed, descent rate and opening altitudes for military static-line, military freefall, sport, tandem and whole-aircraft recovery systems.
What the second pass must settle
- Does the registry intend parachute to include standalone braking and drogue parachutes, and where should an auxiliary deployment parachute become a separate related instance?
- Should the default instance boundary be the canopy and suspension assembly or the complete installed system, and how should interchangeable components retain their identities?
- Which authoritative sources establish inspection, packing, service-life and permitted-use requirements for each parachute role and jurisdiction?
- Which area, supported-mass and performance conventions allow meaningful comparison across different canopy families?
- What evidence is sufficient for an agent to record serviceability, and which determinations must remain with a manufacturer, qualified inspector or operating authority?