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The EVS Ice Protection System is automatically activated upon selection of either the Left or Right Cowl Anti.Ice (CAI) switch. No additional pilot action is required to activate the EVSIPS, thus, when either CAI switch is selected “ON”, a ground discrete from the switch is detected and the EVSHC enters ice protection mode (IN FLIGHT ONLY). This action activates embedded heaters within the EVS heated fairing and IRW. The heater controller then monitors the cycle with the use of embedded RTD temperature sensors. The IRW heater operates in “running wet anti.ice” configuration, providing sufficient heat only to prevent impinging water from freezing on contact. This water is free to run back and freeze on the fairing. The fairing, on the other hand is cyclically de.iced. The period of the de.icing cycle is 180 seconds. However, the duty time the heaters are actually active within this time frame is varible, depending on the Total Air Temperature. The heated surfaces are each monitored by two RTDs. The fairing, being cyclically heated and not controlled to a given temperature, has two overheat detection RTDs. The IRW is controlled to a specific temperature set point, has one control and one overheat RTD. In the case of a single sensor failure, the remaining sensor will assume both functions. Status information is displayed to the pilot by means of the EICAS. The EVSHC communicates with the CAIMS, IAC and the DAU to provide failure indication and maintenance information. IRW Demisting Control The IRW is controlled by the EVSHC to a temperature sufficient to prevent condensation. The EVSHC controls the activation of the demisting based on a demist set point as calculated by the HUD based on SAT and is only active while the ISU is ON. This set point is transmitted from the HUD to the EVSHC via the DAU on the ARINC bus. When both deice and demist conditions are required, the higher window temperature is utilized to ensure both clear view and ice protection are maintained. Volume 2 Flight Crew Operating Manual Rev 7, Dec 01, 2005 ENHANCED VISION SYSTEM (EVS) (IF INSTALLED) (CONT'D) EVS Ice Protection System Architecture EVS Control Panel . .
HUD Control Knob FLIGHT INSTRUMENTS |
