Parts of turbo-jets and turbo-propellers

1. Scope and Applicability

This PCR covers gate-to-gate manufacture of new turbo-jet and turbo-propeller engine parts from a purchased near-net-shape preform through precision machining and the applicable thermal, surface, joining, cleaning, and inspection operations to one unpackaged finished conforming part at the manufacturer's factory gate. It applies to blades, vanes, discs, shafts, casings, combustor parts, and other identifiable engine parts sold separately. It excludes complete engines, auxiliary power units, non-engine aircraft parts, tooling, repair and overhaul, engine assembly or installation, use, maintenance, post-gate transport, packaging, and end-of-life. The declared part number, drawing revision, alloy grade, criticality category, manufacturing route, production site, and acceptance status are mandatory foreground descriptors.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.general-purpose-machinery.parts-of-turbo-jets-and-turbo-propellers
classification_refs	CPC 3.0: 43155, Parts of turbo-jets and turbo-propellers
covered_products	New, separately supplied finished parts designed for turbo-jet or turbo-propeller engines, including blades, vanes, discs, shafts, casings, and combustor parts
excluded_products	Complete engines; auxiliary power units; other reaction engines; non-engine aircraft parts; tooling; repaired or overhauled parts; packaging
representative_product	One unpackaged finished conforming turbine-engine part identified by part number and drawing revision
production_route	Purchased near-net-shape preform followed by precision machining, with heat treatment, joining, chemical milling, coating, cleaning, and non-destructive inspection included only when performed for the declared part
market_state	New, clean, unpackaged, accepted part at the manufacturer's factory gate, not installed in an engine

3. Reference Flow

Field	Value
What	A new turbo-jet or turbo-propeller engine part conforming to its approved design data
How much	1 kg net mass of accepted finished part
How well	Conforms to the declared part number, drawing revision, material specification, process route, and acceptance criteria
How long or cycle	One completed manufacturing and acceptance cycle; no use-life service is credited
reference_flow_link	rf_finished_engine_part

Field	Value
Reference amount	1 kg
Reference product flow	Parts of turbo-jets and turbo-propellers 4dfe38dc-4e31-4840-b627-49ca65a2accd
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	part number; drawing revision; engine model or approved applicability; alloy and material specification; criticality category; manufacturing route; production site and geography; production period; new-part state; acceptance and inspection status; net-mass measurement basis; unpackaged factory-gate state

When constructing a foreground data package, every required qualifier must be declared in dataset metadata, process notes, the reference-flow comment, or an equivalent field.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_net_mass	accepted reference product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Measure net mass after final cleaning and acceptance; exclude removable protective caps, fixtures, transport packaging, and rejected parts.
electricity_energy	purchased electricity	Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66	MJ	Record metered delivered electricity in MJ; when records are in kWh, multiply by exactly 3.6 MJ/kWh and retain the original reading.
gas_volume	gaseous natural gas	Volume 93a60a56-a3c8-22da-a746-0800200c9a66	m3	State temperature, pressure, and whether the meter reports actual or standardized volume; do not combine gas with electricity.
material_mass	preform, chemicals, scrap, wastewater, and direct CO2	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use net mass crossing the process boundary; state solution concentration for sodium hydroxide and whether wastewater is wet mass.

5. System Boundary

rule_id	Applies to	Rule	source_ids
boundary_factory_gate	foreground system	Begin when the purchased preform enters the manufacturing site and end when the unpackaged part passes final acceptance at the factory gate; include machining and every declared on-site conditional operation, utilities, direct emissions, rejects, and wastes.	us-epa-aerospace-ctg-1997; nasa-cr-159464-1979
boundary_upstream_inputs	purchased inputs	Represent production of the preform, electricity, gas, water, and chemicals with separate upstream datasets; do not reproduce their upstream production inside this foreground dataset.
boundary_exclusions	excluded stages	Exclude capital equipment, tooling production, worker travel, packaging, post-gate transport, engine assembly, installation, use, maintenance, repair, overhaul, and end-of-life unless the study explicitly expands the boundary and reports them separately.
boundary_route_disclosure	conditional operations	Include heat treatment, chemical milling, coating, joining, and their cleaning or waste treatment only when actually performed for the declared part; disclose every included and not-applicable route.	us-epa-aerospace-ctg-1997

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased near-net-shape engine or turbine part preform received at the manufacturing-site gate
starting_condition_role	Upstream supplied intermediate and starting product for foreground finishing
product_classification_scope	Finished parts of turbo-jets and turbo-propellers; the starting preform may lie in a broader engine-and-turbine-parts class
recursive_input_rule	Record the received preform once as an input. If it is supplied by another facility and would otherwise invoke this PCR recursively, stop tracing at the declared received-preform condition and link a separate upstream preform dataset.
upstream_dataset_requirement	The upstream dataset must identify alloy grade, preform route, product state, supplier geography, delivery condition, and mass delivered.
disclosure	Disclose the preform identity, alloy specification, forming or casting route, supplier boundary, included finishing steps, and any same-category recursion cut.

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
preform_receipt	Preform receipt and preparation	required	Always; use the actual purchased preform entering the site	foreground starting condition	kg preform received per kg accepted part
precision_machining	Precision machining and mechanical finishing	required	Always; record actual machining and cleaning operations	foreground production	kg accepted machined part output
thermal_processing	Heat treatment	conditional	Include when furnaces or thermal cycles are operated for the declared part	foreground conditioning	kg thermally processed part output
surface_processing	Chemical milling, coating, and surface cleaning	conditional	Include each operation actually performed for the declared part	foreground surface conditioning	kg surface-processed part output
final_inspection	Final inspection and acceptance	required	Always	foreground quality acceptance	kg accepted finished part

Process: Preform receipt and preparation (preform_receipt)

Inputs

Product flows

Purchased near-net-shape preform (purchased_preform)

Record the actual delivered preform mass and retain its alloy grade, forming route, supplier, and delivery state.

• Selected flow: Near-net-shape engine and turbine part preforms 3789e1b9-f247-49c1-97ad-6036de9b6976
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured accepted preform mass issued to the production order
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Process: Precision machining and mechanical finishing (precision_machining)

Inputs

Product flows

Machining electricity (machining_electricity)

Record delivered electricity consumed by the machining cell for the production order.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66 / MJ 93a60a57-a3c8-11da-a746-0800200c9a66
• Amount rule: metered machining-cell electricity allocated from machine time when direct submetering is unavailable
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_records
• Sources:

Machining process water (machining_process_water)

Record process water crossing the machining boundary as make-up or cleaning water.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured make-up and cleaning water attributable to the production order
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Cutting-fluid concentrate (cutting_fluid_concentrate)

Record only fresh cutting-fluid concentrate consumed by the included machining operations.

• Selected flow: Metalworking cutting fluid concentrate
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured concentrate make-up consumed, excluding recirculated working fluid retained in the system
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Outputs

Waste flows

Nickel-based superalloy machining scrap (nickel_superalloy_scrap)

Record segregated nickel-based superalloy chips, swarf, and rejected material leaving the process as waste.

• Selected flow: Nickel-based superalloy machining scrap
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured segregated chips, swarf, and rejected material; not applicable when the part contains no nickel-based superalloy
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Titanium-alloy machining scrap (titanium_alloy_scrap)

Record segregated titanium-alloy chips, swarf, and rejected material leaving the process as waste.

• Selected flow: Titanium-alloy machining scrap
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured segregated chips, swarf, and rejected material; not applicable when the part contains no titanium alloy
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Stainless-steel machining scrap (stainless_steel_scrap)

Record segregated stainless-steel chips, swarf, and rejected material leaving the process as waste.

• Selected flow: Stainless-steel machining scrap
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured segregated chips, swarf, and rejected material; not applicable when the part contains no stainless steel
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Aluminium-alloy machining scrap (aluminium_alloy_scrap)

Record segregated aluminium-alloy chips, swarf, and rejected material leaving the process as waste.

• Selected flow: Aluminium-alloy machining scrap
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured segregated chips, swarf, and rejected material; not applicable when the part contains no aluminium alloy
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_mass_balance
• Sources:

Process: Heat treatment (thermal_processing)

Inputs

Product flows

Furnace natural gas (thermal_natural_gas)

Record gaseous natural gas delivered to included fuel-fired heat-treatment equipment.

• Selected flow: natural gas in the gaseous state 4f19ca0e-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Volume 93a60a56-a3c8-22da-a746-0800200c9a66 / m3 93a60a57-a3c8-12da-a746-0800200c9a66
• Amount rule: metered gas consumed by included heat-treatment cycles; not applicable for all-electric furnaces
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_energy_records
• Sources:

Heat-treatment electricity (thermal_electricity)

Record delivered electricity consumed by included furnaces and their auxiliaries.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66 / MJ 93a60a57-a3c8-11da-a746-0800200c9a66
• Amount rule: metered electricity for included furnace cycles and auxiliaries
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_records
• Sources:

Outputs

Elementary flows

Direct fossil carbon dioxide (thermal_fossil_co2)

Record fossil carbon dioxide emitted directly from on-site fuel combustion in heat treatment.

• Selected flow: carbon dioxide (fossil) 08a91e70-3ddc-11dd-923d-0050c2490048
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured stack emission or calculated direct fossil CO2 from metered furnace fuel and documented fuel carbon content; exclude upstream electricity emissions
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_direct_emissions
• Sources:

Process: Chemical milling, coating, and surface cleaning (surface_processing)

Inputs

Product flows

Surface-process water (surface_process_water)

Record process water delivered to included chemical-milling, coating, and cleaning operations.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured make-up and rinse water for included surface operations
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_surface_records
• Sources: us-epa-aerospace-ctg-1997

Sodium hydroxide (surface_sodium_hydroxide)

Record sodium hydroxide consumed in an included surface-treatment bath as pure-chemical mass.

• Selected flow: Sodium hydroxide e0abcced-0611-4c24-9290-5a2c5a0c4169
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured solution make-up converted to sodium-hydroxide mass using recorded concentration; not applicable when sodium hydroxide is not used
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_surface_records
• Sources: us-epa-aerospace-ctg-1997

Surface-process electricity (surface_electricity)

Record electricity consumed by included baths, ventilation, coating, and cleaning equipment.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66 / MJ 93a60a57-a3c8-11da-a746-0800200c9a66
• Amount rule: metered electricity attributable to included baths, ventilation, coating, and cleaning equipment
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_records
• Sources: us-epa-aerospace-ctg-1997

Outputs

Waste flows

Metal-finishing process wastewater (metal_finishing_wastewater)

Record the specific aqueous waste stream leaving included metal-finishing operations for treatment.

• Selected flow: Metal-finishing process wastewater
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: measured wet mass discharged to on-site treatment or transferred off site; identify treatment destination and major regulated constituents
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_surface_records
• Sources: us-epa-aerospace-ctg-1997

Process: Final inspection and acceptance (final_inspection)

Inputs

Product flows

Inspection electricity (inspection_electricity)

Record electricity consumed by final dimensional, non-destructive, and acceptance inspection equipment.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66 / MJ 93a60a57-a3c8-11da-a746-0800200c9a66
• Amount rule: metered electricity for dimensional and non-destructive inspection and acceptance equipment
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_records
• Sources: faa-ac-33-8-2009

Outputs

Product flows

Accepted finished engine part (finished_engine_part)

Record the unpackaged finished conforming part that passes final acceptance and realizes the reference flow.

• Selected flow: Parts of turbo-jets and turbo-propellers 4dfe38dc-4e31-4840-b627-49ca65a2accd
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg 93a60a57-a4c8-11da-a746-0800200c9a66
• Amount rule: exactly 1 kg net accepted part output by reference-flow definition
• Value mode: Fixed value (fixed_value)
• Specificity: Generic (generic)
• Normalization basis: 1 kg reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Identity reference (identity_reference)
• Sources: un-cpc-3-0-structure-2025; faa-ac-33-8-2009

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_subdivide	shared manufacturing equipment	Prefer submetering or subdivision by production order, machine time, furnace load, bath throughput, or inspection time before allocation.
allocation_shared_resources	residual shared utilities	Allocate residual shared utilities using a physical driver causally linked to consumption; report the driver and sensitivity when shared burdens are material.
allocation_scrap	segregated metal scrap	Treat machining scrap as a waste output at the factory gate. Do not subtract recycling credit from the reference product unless an explicitly declared consequential scenario is reported separately.
allocation_rejects	rejected parts	Include the burdens of rejected parts produced during the reporting period in accepted output; disclose rejection mass and any rework loop.	faa-ac-33-8-2009

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_material_mass_balance	preform_receipt; precision_machining	preform, water, cutting fluid, and segregated scrap	receiving record; issue ticket; scale record; waste manifest	part number; lot; alloy; gross and tare mass; quantity issued; quantity returned; scrap stream	calibrated scales and reconciled production-order records	kg	each lot and production order	representative continuous 12 months or full campaign	all included production lines	sum inputs and outputs, subtract returns, divide by accepted net product mass	calibration, lot traceability, mass-balance reconciliation
cp_energy_records	precision_machining; thermal_processing; surface_processing; final_inspection	electricity and natural gas	submeter; utility meter; equipment runtime log	meter start/end; fuel volume; reference conditions; equipment runtime; load; production order	direct submetering preferred; otherwise allocate metered area energy using equipment runtime and load	MJ; m3	each batch or monthly with order-level driver	representative continuous 12 months or full campaign	all included equipment and shared services	subtract non-production loads, allocate by documented physical driver, normalize to accepted kg	meter calibration, invoice reconciliation, allocation check
cp_surface_records	surface_processing	water, sodium hydroxide, and wastewater	bath make-up log; concentration test; water meter; discharge record	solution mass; NaOH concentration; make-up and rinse water; wastewater wet mass; treatment destination	calibrated meter or scale plus laboratory concentration record	kg	each bath make-up and discharge event	representative continuous 12 months or full campaign	every included surface line	calculate pure NaOH mass; sum water and wastewater; normalize to accepted kg	concentration certificate, meter calibration, discharge manifest
cp_direct_emissions	thermal_processing	direct fossil CO2	stack measurement or fuel-carbon calculation record	fuel volume; reference conditions; carbon content; oxidation basis; measured CO2	validated stack method or documented carbon-balance calculation	kg	each test campaign or reporting period	same period as fuel records	all included fuel-fired equipment	subtract biogenic carbon, prevent overlap with upstream datasets, normalize to accepted kg	method record, fuel certificate, calculation review

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_normalize_mass	all inventory rows	amount per reference flow = attributable amount / accepted finished-part net mass	attributable amount; accepted net mass	amount per 1 kg accepted part
calc_electricity	electricity rows	MJ = recorded kWh × 3.6; allocate only when direct order-level metering is unavailable	kWh; runtime/load driver; accepted mass	attributable electricity in MJ/kg
calc_naoh_mass	sodium hydroxide	pure NaOH mass = solution mass × measured mass fraction	solution mass; concentration	kg NaOH/kg accepted part	us-epa-aerospace-ctg-1997
calc_direct_co2	direct fossil CO2	use validated measured CO2 or fuel carbon balance; count on-site combustion only once	gas consumption; carbon content; oxidation basis or measured stack result	kg fossil CO2/kg accepted part

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_identity	reference product and preform	Preserve part number, drawing revision, engine applicability, alloy specification, lot, route, supplier state, and acceptance disposition.	approved design/production records and lot traceability; faa-ac-33-8-2009
dq_measurement	meters, scales, and tests	Use calibrated instruments and retain raw readings, conversion factors, allocation drivers, and uncertainty or detection-limit treatment.	calibration and inspection records
dq_temporal	foreground dataset	Cover a representative continuous 12-month period or the full production campaign; disclose shutdowns, low-volume prototypes, and atypical batches.	dated production and utility records
dq_completeness	included operations	Reconcile preform, accepted output, rejects, segregated scrap, water, fuel, electricity, chemicals, wastewater, and direct emissions for every applicable process.	mass/energy reconciliation and route checklist
dq_route	conditional processes	State which heat-treatment, surface, coating, joining, cleaning, and inspection operations were performed and which were not applicable.	traveler, router, or batch record; us-epa-aerospace-ctg-1997

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validate_identity	reference flow	Fail when CPC identity, part number, drawing revision, engine applicability, alloy, route, new-part state, acceptance status, or unpackaged factory-gate state is missing.	un-cpc-3-0-structure-2025; faa-ac-33-8-2009
validate_reference_mass	reference output	Require exactly 1 kg net accepted output and exclude rejects, fixtures, protective caps, and packaging from that mass.
validate_route_inventory	process inventory	Require every performed operation in the route record to have corresponding inputs, outputs, utilities, wastes, and direct emissions; require conditional rows to be explicitly not applicable when absent.	us-epa-aerospace-ctg-1997; nasa-cr-159464-1979
validate_no_double_count	emissions and upstream datasets	Fail when upstream electricity or fuel-supply emissions are repeated as direct foreground emissions, or when recirculated cutting fluid is counted again as fresh concentrate.
validate_mass_balance	material flows	Investigate unreconciled preform-to-product-plus-scrap mass differences and disclose retained work in progress, evaporation, sampling, or measurement uncertainty.

10. Published Dataset Profile

Field	Value
dataset_role	Foreground product-manufacturing dataset for an unpackaged accepted turbine-engine part at factory gate
downstream_use	secondary_dataset; background_dataset
allowed_use	Product-footprint, aircraft-engine supply-chain, procurement, process-improvement, and comparative studies when product identity, route, geography, period, and allocation are compatible
excluded_use	Complete-engine manufacture or operation; generic aircraft parts; repair or overhaul; unqualified substitution across alloys, part criticality, routes, or acceptance states
required_metadata	PCR id and version; part number; drawing revision; engine applicability; alloy and material specification; criticality category; preform identity; route; site and geography; period; accepted mass; rejection rate; included operations; meter and allocation methods; upstream datasets
required_quality_disclosure	data coverage; calibration; supplier-data quality; mass and energy reconciliation; route applicability; allocation; unresolved UUIDs; missing range evidence; uncertainty and limitations
update_trigger	Change in part design, alloy, preform route, heat treatment, surface process, supplier, site, energy supply, acceptance criteria, allocation method, or a material shift in rejection or resource intensity

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	official_guidance	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025, https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-05)	Official CPC 43155 product identity and classification title
us-epa-aerospace-ctg-1997	official_guidance	U.S. EPA, Control of Volatile Organic Compound Emissions from Coating Operations at Aerospace Manufacturing and Rework Operations, EPA-453/R-97-004, December 1997, https://www3.epa.gov/airquality/ctg_act/199712_voc_epa453_r-97-004_aerospace_rework.pdf (retrieved 2026-09-05)	Aerospace component process decomposition; conditional coating, chemical milling, heat treating, cleaning, finishing, and testing; surface-process records
faa-ac-33-8-2009	official_guidance	U.S. Federal Aviation Administration, Guidance for Parts Manufacturer Approval of Turbine Engine and Auxiliary Power Unit Parts under Test and Computation, AC 33-8, 19 August 2009, https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_33-8.pdf (retrieved 2026-09-05)	Turbine-engine part identity, criticality, design substantiation, testing, acceptance, and traceability requirements
nasa-cr-159464-1979	literature	L. W. Sink, G. S. Hoppin III, and M. Fujii, Materials for Advanced Turbine Engines, Project Completion Report, Project 1—Low-Cost Directionally-Solidified Turbine Blades, Volume I, NASA CR-159464, January 1979, https://ntrs.nasa.gov/api/citations/19790015950/downloads/19790015950.pdf (retrieved 2026-09-05)	Turbine-blade route evidence for casting followed by heat treatment, machining, coating, and inspection/testing