Landing Gear An unpressurized, harsh environment zone ZONE 6
C ommercial airplanes use a nose landing gear and two main landing gears. The nose gear has the steering function, and typically a junction box located midway down the landing gear itself. The main landing gear has an extensive amount of wiring that interfaces with wheel speed sensors, antilock braking equipment, and electric brake systems. The area is exposed to severe external environmental conditions in addition to vibration and chemical contamination. EWIS harnesses interconnecting the landing gear are hardened against impact from rocks, ice, and mud, and may be housed within special metal-core or polymer core conduit.
Turnkey Wire Protection Assemblies for Wheel Sensor and Braking Systems FAA qualified flexible polymer and metal-core conduit materials Ideally suited for rugged aircraft zones including Zone 2 Impact-resistant and immune to chemical contamination Integrated overbraiding for added strength and EMI/RFI immunity
Zone 6 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 150°C; DO-160 Category D3 Sea level to 50kft; DO-160 Category D3 -55° to 150°C; DO-160 category D3
Shock
Ground Survival Temperature
Pressure Differential Operating Temperature
Moisture Exposure to humidity and condensation; driving rain, de-icer, hydraulic fluids, fuel; EIA-364-10 with the fluids defined in DO-160 Table 11-1 *note: landing gear environment must be coordinated with airplane manufacturer for specific dynamic environment definition
Qwik Connect • April 2019
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