Envergure glossary

Everyday vocabulary in aviation maintenance, airworthiness and supply chain as used in Envergure.

Maintenance and airworthiness

Aircraft maintenance programme (PEA): Top-level reference grouping every maintenance programme applicable to an aircraft or a fleet. Approved by the authority.

Maintenance programme (PRE): Definition of the maintenance cycle for a module or component: limits, intervals, operations. A PEA aggregates several PREs.

Applied configuration (CA): Actual state of the modules installed on an aircraft at a given point in time. Differs from the theoretical configuration (AEP) when waivers, modifications or evolutions apply.

Product evolution architecture (AEP): Reference structure of an aircraft type or engine family. Defines theoretical employment points and the variants allowed.

Work Package (WP / OT): Batch of maintenance operations to be executed, usually triggered by a due limit or a user request. A WP groups several tasks.

Work dossier (DT (French: Dossier de travail)): Operational dossier that materialises a maintenance intervention: order, expected operations, removed/installed parts, captured technical data, signatures. In practice the full content of a WP/OT viewed as a “documentary stack”.

Technical data: Measurements, counters, observations, photos or notes attached to a component, an aircraft or a WP. Captured on the field via the Technical data drawer in the UI. Journaled and audited. ⚠ Not to be confused with “DT” — in French jargon “DT” stands for Dossier de travail (work dossier), not technical data.

Certificate of Release to Service (CRS / APRS): Formal technical document certifying that an aircraft or component may be returned to service after maintenance. Must be signed by a licensed signatory (AME).

Aircraft Maintenance Engineer (AME): Certifying staff: an individual holding a licence and the necessary delegations to sign a CRS for a given scope.

EASA Part-145: European regulation defining the approval of maintenance organisations. Applies to workshops performing tasks affecting airworthiness.

CAMO: Continuing Airworthiness Management Organisation: entity responsible for keeping an aircraft airworthy throughout its operational life.

EMAR / FR: European Military Airworthiness Requirements, transposed into French national rules. Defence-side equivalent of EASA for military aircraft.

Identified service load (CSI): Identified, planned and traced work on an aircraft. A specific kind of WP linked to an operational event or a modification programme.

Cycle / landing counters (CSN / ISN): Fatigue counters: Cycle Since New, Cycle Since Installed, Cycle Since Overhaul. Track real component usage to trigger scheduled visits.

Part Number (PN): Unique manufacturer identifier for a part type or module. A single PN may have multiple physical instances (Serial Numbers).

Serial Number (SN): Serial number, unique for each physical instance of a serialised component (turbines, computers, etc.).

Amendment: Definition index of a part reference (A, B, C…). A given reference may exist in several amendments, carried on the serial number (an instance is built to a given index). Distinct from the modification level (modLevel): the amendment is the build index, while modLevel tracks the embodied MODs. Ordered (a higher index is a compatible replacement), optional on the instance. May drive configuration applicability and maintenance limits.

NATO Commercial and Government Entity (NCAGE): Five-character code identifying a manufacturer or a supplier in the NATO nomenclature. Envergure displays part numbers as PN:NCAGE.

ATA chapter (ATA): Air Transport Association: standardised classification of an aircraft’s systems (ATA-21 air conditioning, ATA-32 landing gear, etc.). Used for tasks and documents.

S1000D: Modular technical documentation standard (Data Modules). Used to produce interactive illustrated manuals.

S2000M: Logistics data exchange standard for aviation materiel provisioning. Covers the M-processes.

S3000L: Integrated logistics support standard (LSAR). Defines support analysis based on supplier specifications.

S4000P: Standard defining preventive maintenance programmes. Reference adopted by Envergure to model PREs.

S5000F: Operational feedback standard from operator to industrial. Closes the reliability loop with the product design office.

S6000T: Training and training-need analysis standard derived from technical data. Still rarely implemented.

Minimum Equipment List (MEL / CDL): Minimum equipment list: equipment whose inoperability is tolerated for take-off under operational constraints.

Stock Item

Physical instance of a part or module present in the stock. Identified by PN + SN (if serialised)

Storage Type: Logical location type of a stock item: general warehouse, quarantine area, test bench, installed on aircraft. Drives permitted transitions.

Technical reception: Workflow that brings a component into stock after technical control: documentary conformity (EASA Form 1), physical inspection, capture of initial counters.

Container vs Employment Point: Container: a module that hosts sub-modules (turbine, computer). Employment Point: a functional slot on the aircraft (pilot station, avionics bay).

Air-gapped deployment: Deployment without any outbound Internet connectivity. Each remote instance runs autonomously and resynchronises when connectivity is restored.

Instance (Tenant): Isolated data perimeter for a customer or site. Each instance carries its own aircraft, stocks, programmes and actors. Identified by a ULID in the X-Instance-Id header.

ULID: Universally Unique Lexicographically Sortable Identifier: 26-character Crockford base32, sortable by creation order. Used as the primary key in every Envergure entity.