Name: ISO 22181:2021 — Aerospace fluid systems and components — Variable displacement hydraulic motors — General specifications
SKU: ISO 22181:2021
Price: 25 EUR
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Overview

ISO 22181:2021 - Aerospace fluid systems and components - Variable displacement hydraulic motors - General specifications - defines the general requirements for variable displacement uni-directional and bi-directional hydraulic motors intended for aircraft hydraulic systems at pressures up to 35 000 kPa (5 000 psi). The standard covers design and test requirements for primary and secondary function motors but explicitly excludes actuators with internal rotation angle limits and low-speed motors. ISO 22181:2021 is intended to be used together with a project-specific detail specification for each application.

Key topics and technical requirements

ISO 22181:2021 organizes comprehensive technical requirements, including:

Functional requirements
- Hydraulic fluid compatibility and rated operating pressures (supply, differential, case drain, return)
- Flow specifications (rated consumption, case drain flow, leakage limits)
- Speed, direction of rotation and dynamic characteristics (braking, reversals)
- Torque definitions (rated, break-out, stalling, torque pulsations)
- Efficiency, response time, stability and passive operation limits
- Temperature and acoustic noise constraints
Design and construction
- Dimensionally critical components, maintainability and lubrication
- Seals, balance, safety-wire provisions, electro-conductive bonding
- Marking and nameplate information, fluid identification and port labelling
Strength and durability
- Proof and ultimate pressures for motor case and ports
- Pressure impulse (fatigue) requirements and port strength
- Rated endurance, environmental and corrosion protection expectations
Installation, maintenance and quality
- Dimensional, mass, mounting, orientation and drive-shaft interface requirements
- Service life limitations, storage, reliability requirements and quality assurance provisions
- Requirement to meet applicable airworthiness regulations and qualification procedures

Practical applications and who uses it

ISO 22181:2021 is essential for:

Aerospace OEMs specifying variable displacement hydraulic motors for flight control, landing gear, flight actuation and utility systems.
Hydraulic motor manufacturers and suppliers designing, testing and certifying motors for aircraft use.
Systems and mechanical engineers integrating motors into aircraft hydraulic systems to ensure compatibility and airworthiness.
Test laboratories and certification bodies conducting prototype qualification, endurance and environmental testing.
Maintenance and procurement teams using the standard for acceptance, overhaul criteria and supplier evaluation.

Using ISO 22181 helps ensure consistent safety, performance and interoperability of hydraulic motors across the aerospace supply chain.

Related standards

ISO 22181:2021 is intended to be used alongside project-specific detail specifications and other aerospace fluid systems and airworthiness standards (system-level, material and testing standards and relevant regulatory guidance). These complementary documents establish application-specific tests, certification and integration requirements.

ISO 22181:2021 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and who uses it

Related standards

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