vocabulary: 1.0.0
info:
  provider: TransDigm Group
  description: Vocabulary for the TransDigm Group aerospace components business covering proprietary aerospace products, systems, and the aerospace and defense supply chain.
  created: '2026-05-03'
  modified: '2026-05-03'
domain:
  terms:
    - term: Proprietary Content
      definition: Aerospace components for which TransDigm holds the design and is the sole or primary manufacturer, providing pricing power in the aftermarket.
    - term: Sole-Source
      definition: A supplier position where TransDigm is the only qualified manufacturer of a specific part, common in aerospace for safety-critical components.
    - term: Aftermarket
      definition: The market for replacement parts, maintenance, and repair of aircraft after initial OEM production, TransDigm's highest-margin segment.
    - term: OEM
      definition: Original Equipment Manufacturer — aircraft or engine manufacturers that purchase TransDigm components during production (e.g., Boeing, Airbus, GE, Pratt & Whitney).
    - term: MRO
      definition: Maintenance, Repair, and Overhaul — services and parts used to maintain aircraft in service, a key aftermarket channel.
    - term: Actuation System
      definition: Electromechanical or hydraulic system that moves flight control surfaces, landing gear, doors, and other aircraft structures.
    - term: Ignition System
      definition: Aircraft engine starting and continuous ignition system using high-energy spark igniters and exciter units.
    - term: ETD
      definition: Engineered to Drawing — custom aerospace components manufactured to customer-supplied design specifications.
    - term: Operating Unit
      definition: One of TransDigm's approximately 49 largely autonomous business units, each focused on specific product lines and customer relationships.
    - term: Defense OEM
      definition: Military aircraft and systems manufacturers purchasing TransDigm components for defense programs.
    - term: Flight Control
      definition: Mechanical and electrical systems controlling aircraft attitude and trajectory via control surfaces.
    - term: Airframe Component
      definition: Structural or mechanical parts of the aircraft fuselage, wings, and tail assembly.
    - term: PMA Part
      definition: Parts Manufacturer Approval — FAA approval allowing production of aircraft parts as alternatives to OEM parts.
    - term: FAA
      definition: Federal Aviation Administration — US regulatory authority overseeing airworthiness certification of aircraft components.
    - term: EASA
      definition: European Union Aviation Safety Agency — European regulatory authority for aircraft component certification.
    - term: AS9100
      definition: Quality management system standard for the aerospace industry, similar to ISO 9001 with additional aviation-specific requirements.
  tags:
    - Aerospace
    - Actuation Systems
    - Aviation
    - Defense
    - Fuel Systems
    - Ignition Systems
    - Manufacturing
    - MRO
    - Passenger Safety
    - Proprietary Components
    - Sole-Source