Electrical Wiring Interconnect System


Engine and Gear Box

E WIS components exposed to high heat can experience accelerated degradation, insulation dryness, and cracking. Direct contact with a high-heat source can quickly damage insulation. Even lower levels of engine and gearbox heat can degrade the EWIS over time. Standard-construction cable harnesses used for interconnection of FADEC equipment or in areas of Zone 5 not in direct contact with the engine may incorporate material types capable of withstanding operating temperatures up to 200°C. Aircraft manufacturers prefer stainless steel connectors and accessories, and cabling shielded with temperature-resistant metallic braid. EWIS cabling transitioning from the engine and gearbox into the adjacent nacelle and pylon zone require pressure and temperature boundary sealing. Adjacent to and interconnected with aircraft via engine pylon and the wing/body fairing

PowerLoad™ Connectors „„ High-vibe, high-temp, high-density power connector series „„ Ideally suited for backup generators in Zone 4 as well as power transmission throughout the aircraft „„ Low-resistance contact delivers lower temperature rise under load „„ Removable wire sealing grommet and wire separator for easy rear release of contacts and improved sealing of tape- wrapped wire

Zone 4 Application Guidelines

Environmental Stress Factors

Applicable RTCA/DO-160 Requirements


DO-160 Category S and H (Table 8-1) DO-160 Category D, Test Procedure 1 -65° to 200°C; DO-160 Category D3 Sea level to 50kft; DO-160 Category D3 -55° to 200°C; DO-160 category D3


Ground Survival Temperature

Pressure Differential Operating Temperature


Exposure to humidity and condensation; DO-160 Category B

Qwik Connect • April 2019


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