ISO 18170:2017

Overview

ISO 18170:2017 - "Aerospace series - AC induction electric motor driven, variable delivery, hydraulic pumps - General requirements" establishes the general requirements for AC induction electric motor driven, variable delivery hydraulic pumps intended for use in aircraft hydraulic systems. The standard covers units powered from alternating current (AC) supplies that may be constant frequency (CF) or variable frequency (VF) and is intended to be used together with application-specific detail specifications. ISO 18170:2017 addresses design, functional, environmental, strength, installation, maintenance and testing aspects needed to ensure airworthiness and reliable operation.

Key Topics

ISO 18170:2017 organizes requirements across electrical, hydraulic, mechanical and quality disciplines. Key technical topics include:

• Electrical requirements

  • AC power characteristics (CF or VF supply)
  • Electromagnetic interference (EMI) and electrical bonding
  • Protection and motor cooling methods

• Hydraulic requirements

  • Hydraulic fluid compatibility and inlet/case drain pressures
  • Pump flows, rated speed, efficiency and heat rejection
  • Variable-delivery control behavior and dry-running considerations

• Functional & integrated assembly

  • Acoustic noise, endurance and operational qualification
  • Environmental performance and airworthiness requirements

• Detailed design & construction

  • Dimensionally critical components, seals, lubrication, balance
  • Materials selection, corrosion protection and casting practices
  • Marking, port identification and direction of rotation

• Strength, installation & testing

  • Pressure loads, proof and ultimate pressure, fatigue (pressure impulse)
  • Installation parameters: mass, center of mass, mounting, orientation, ports and electrical connections
  • Quality assurance, test-stand requirements and acceptance tests (electrical and hydraulic checks, break-in runs)

Applications and Who Uses It

ISO 18170:2017 is essential for stakeholders involved in aircraft hydraulic power systems and electro-mechanical pump (EMP) units:

• Aerospace OEMs and systems integrators specifying or qualifying EMP units for new aircraft designs
• Hydraulic pump manufacturers and suppliers developing AC induction motor-driven, variable-delivery pumps
• Certification authorities and test laboratories conducting qualification and acceptance testing
• Maintenance engineers and MRO providers applying installation, servicing and reliability criteria
• Procurement teams ensuring purchased EMPs meet airworthiness and interoperability requirements

Practical uses include design validation, procurement specifications, qualification testing, installation guidance, and maintenance planning to ensure safe, efficient aircraft hydraulic power solutions.

Related Standards

ISO 18170:2017 is a general requirements document intended to be used in conjunction with application-specific detail specifications and other aerospace electrical and hydraulic standards and regulations that govern airworthiness, electromagnetic compatibility, and materials.