Electrical Wiring Interconnect System - EWIS
Code of Federal Regulations [14 CFR § 25.1701 (a)]
EWIS safety Electrical Wiring Interconnect Systems
Electrical Wiring Interconnect System (EWIS) means any wire, wiring device, or combination of these, including termination devices, installed in any area of the airplane for the purpose of transmitting electrical energy, including data and signals, between two or more intended termination points. This includes:
(1) Wires and cables.
(2) Bus bars.
(3) The termination point on electrical devices, including those on relays, interrupters, switches, contactors, terminal blocks and circuit breakers, and other circuit protection devices.
(4) Connectors, including feed-through connectors.
(5) Connector accessories.
(6) Electrical grounding and bonding devices and their associated connections.
(7) Electrical splices.
(8) Materials used to provide additional protection for wires, including wire insulation, wire sleeving, and conduits that have electrical termination for the purpose of bonding.
(9) Shields or braids.
(10) Clamps and other devices used to route and support the wire bundle.
(11) Cable tie devices.
(12) Labels or other means of identification.
(13) Pressure seals.
(14) EWIS components inside shelves, panels, racks, junction boxes, distribution panels, and back-planes of equipment racks, including, but not limited to, circuit board back-planes, wire integration units, and external wiring of equipment.
FAA – AC 25.1701-1 – Certification of Electrical Wiring Interconnection Systems on Transport Category Airplanes
“a. The guidance provided in this document is applicable to transport category airplane
manufacturers, modifiers, foreign civil aviation authorities, Federal Aviation Administration
(FAA) transport airplane type certification engineers, designees, and FAA Flight Standards
b. This guidance can be used to meet the regulatory requirements for development of
EWIS maintenance and inspection procedures as required by 14 CFR sections 25.1729 and
26.11. These maintenance and inspection procedures are required to be part of the
instructions for continued airworthiness (ICA) specified by 14 CFR part 25, section
- Target Group 1: Qualified staff performing EWIS maintenance.
- Target Group 2: Qualified staff performing maintenance inspections on EWIS.
- Target Group 3: Qualified staff performing electrical/avionic engineering on in-service aeroplane.
- Target Group 4: Qualified staff performing general maintenance/inspections not involving wire maintenance (LRU change is not considered wire maintenance)
- Target Group 5: Qualified staff performing other engineering or planning work on in-service aeroplane
- Target Group 6: Other service staff with duties in proximity to electrical wiring interconnection systems
- Target Group 7: Flight Deck Crew
- Target Group 8: Cabin Crew
Easa Ref AMC 20-22 Appendix A & B.
Training available in English (contact us if you need training in another language).