ISO 1151-11:2023

Overview

ISO 1151-11:2023, "Flight dynamics - Vocabulary - Part 11: Control system", is an ISO vocabulary standard that defines terms and definitions used in flight control systems for airplanes and helicopters. Its scope is to establish consistent, authoritative terminology for science, engineering and manufacturing related to flight control systems, helping to avoid ambiguity across design, certification, operation and maintenance activities.

Key topics

This part of the ISO 1151 series organizes and defines fundamental concepts in flight control systems, including:

• Basic concepts
  • System, control system, flight control system, automatic flight control system (AFCS)
  • Control authority, control effectiveness, control sensitivity, attitude control, trim system
• Basic elements
  • Control surfaces (aileron, elevator, rudder, elevon, ruddervator, canard)
  • Secondary surfaces (flap, slat, spoiler, speed brake)
  • Actuators and actuator types: hydraulic actuator, electro-hydrostatic actuator (EHA), electromechanical actuator (EMA)
  • Inceptors (yoke, control stick, sidestick, pedals, collective), sensors, effectors
  • Rotary-wing controls: main rotor collective/cyclic, tail rotor collective
  • Specialized items: thrust vectoring, stabilator, balance/servo/anti-servo tabs
• Control system classification
  • Manual/mechanical, hydro-mechanical, electro-hydraulic, electrical, fly‑by‑wire (FBW), and fly‑by‑light systems
• Administrative notes: contains indexed terms and has no normative references

Practical applications

ISO 1151-11:2023 is designed for any organization or professional who needs precise, shared vocabulary for flight control systems:

• Aerospace engineers and systems designers standardizing specifications and interface definitions
• Avionics and control‑law developers working with AFCS, autopilot and flight director systems
• Manufacturers and suppliers producing actuators, sensors, inceptors and control surfaces
• Certification authorities, test laboratories and regulatory bodies requiring consistent terminology in reports and standards
• Technical authors, trainers and maintenance personnel drafting manuals, training curricula and maintenance procedures
• Procurement and contract teams specifying requirements and deliverables

Using consistent terminology improves interoperability, reduces miscommunication in multidisciplinary teams, and supports regulatory compliance and certification workflows.

Related standards

• ISO 1151 series (other parts of the Flight dynamics - Vocabulary family)
• Standards and guidance relevant to avionics, actuators and control‑law certification (see national standards bodies and ICAO/EASA/FAA documents for complementary regulatory detail)

Keywords: ISO 1151-11:2023, flight dynamics vocabulary, flight control system terminology, AFCS, fly-by-wire, actuators, control surfaces, inceptors, sensors.