T his zone of the aircraft experiences high vibration, heat, frequent maintenance cycles, and susceptibility to chemical contamination. There are critical variable temperature zones within the engine cowling. Typically, the region around the fan is cooler, with temperatures in the range of 85°– 95°C. Aft of the fan, temperatures increase dramatically. Design coordination with the aircraft manufacturer is required for all EWIS technologies routed in and out of the nacelle and via the pylon. Nacelle and Pylon Immediate adjacency to engine and gear box plus wing and wheel well ZONE 3
Firewall and Pressure Boundary Feed-Thrus High-grade engineering thermoplastic or machined metal Solid and split-shell versions Ideally suited for pressure, vapor, and firewall bulkheads throughout the aircraft including Zone 3 O-ring sealed panel and box mounting interface Conductive and non- conductive finish options
Zone 3 Application Guidelines
Environmental Stress Factors
Applicable RTCA/DO-160 Requirements
Vibration
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
Shock
Ground Survival Temperature
Pressure Differential Operating Temperature
Moisture
Exposure to humidity and condensation; DO-160 Category B
Qwik Connect • April 2019
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