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Figure 2-8: Runway Elevation Data Entry (example) Automatic Operations of Runway Elevation: The automatic operation for runway elevation data entry is: ? If the ENTER pushbutton is not pushed after a new runway elevation is entered, the new number is not accepted. If the STBY, RWY, G/S, or ACT pushbutton is pushed before the ENTER pushbutton is pushed, the runway elevation goes back to the number and status that were set when data entry started. ? After a power interruption or HC reset in flight, the runway elevation goes back to the last number and status set. ? After a power interruption or HC reset on the ground, the runway elevation becomes invalid (RWY line shows a “?”). ? When the aircraft lands and the airspeed is less than 20 knots, the runway elevation becomes invalid (RWY line shows a “?”). HGS? Pilot Guide for the Bombardier CRJ 700 Model 4200 2-14 November 2002 9701-1153 Rev A Reference Glideslope Angle Data Entry Set the reference glideslope angle to use the HGS for approach and landing. The reference glideslope angle data entry limits are 0.00 to –9.99°. Follow these steps to set a new reference glideslope angle number. Figure 2-9 shows an example. 1. Push and release the G/S pushbutton. The G/S line shows a solid arrow that points to the right, a minus sign (“–”), and the last accepted reference glideslope angle. The G/S pushbutton light comes on. 2. Use the keypad to put in the reference glideslope angle. When the keypad is pushed, the last accepted reference glideslope angle is removed and replaced with the new number, a space, and a flashing cursor (“_”). If three digits are put in, the cursor is removed and any other keypad entries are ignored. If an error is made, push the CLR pushbutton as a backspace and erase the last number. Push the G/S pushbutton to erase the entire entry. 3. After the correct numbers show on the G/S line, push the ENTER pushbutton to accept the new reference glideslope angle. This step adds “°” for degrees after the number. The G/S pushbutton light goes off. Figure 2-9: Glideslope Data Entry (example) HGS? Pilot Guide for the Bombardier CRJ 700 Model 4200 9701-1153 Rev A November 2002 2-15 Automatic Operations of Reference Glideslope Angle: The automatic operation for reference glideslope angle data entry is: ? If the ENTER pushbutton is not pushed after a new reference glideslope angle is entered, the new number is not accepted. If the STBY, RWY, G/S, or ACT pushbutton is pushed before the ENTER pushbutton is pushed, the reference glideslope angle goes back to the number and status that were set when data entry started. ? After a power interruption or HC reset in flight, the reference glideslope angle goes back to the last number and status set. ? After a power interruption or HC reset on the ground, reference glideslope angle becomes invalid (G/S line shows a “?”). ? When the aircraft lands and the airspeed is less than 20 knots, the reference glideslope angle becomes invalid (G/S line shows a “?”). HCP Display Brightness Use the HCP BRT+ and DIM- pushbuttons and the DSPL cockpit brightness control to set the intensity of the HCP to the intensity of the Radio Tuning Unit (RTU) and the FMS CDU displays: 1. Set the DSPL control at a point where the RTU and the FMS CDU first go off. 2. Push and hold the HCP BRT+ or DIM- pushbuttons to a point where the HCP display first goes off. 3. Use the cockpit DSPL control to adjust the intensity of the HCP, RTU and FMS CDU displays to a satisfactory level. The backlighting of the HCP is set with the INTEG cockpit brightness control so that the backlighting of the HCP is the same as other cockpit panels. HGS? Pilot Guide for the Bombardier CRJ 700 Model 4200 2-16 November 2002 9701-1153 Rev A HGS Computer (HC) The Head-Up Guidance Computer (HC) (Figure 2-10) receives input signals from aircraft sensors and equipment and converts the data to symbology. The HC also evaluates system performance using extensive Approach Monitor, Built-in Test, and input validation processing. The HC is installed in the avionics bay below the cabin floor. Figure 2-10: HGS Computer HGS? Pilot Guide for the Bombardier CRJ 700 Model 4200 9701-1153 Rev A November 2002 2-17 HGS Overhead Unit (OHU) The Overhead Unit (OHU) is located above the left pilot’s head (Figure 2-11) and positioned relative to the Combiner so that symbols such as the Glideslope Reference Line overlay the corresponding features of the www.aero.cn 航空翻譯 www.aviation.cn 本文鏈接地址：龐巴迪挑戰者手冊8
