ESI-500Pilot’s Guide2-15Operation1. When required the pilot may need to do the following:• Set the barometric pressure• Re-align attitude and headingIn-Flight InstructionsIn-air alignment should only be performed duringstraight and level flight without acceleration.2. It is recommended that the SynVis mode be disabled using thePilot menu for QNE operations above transition altitudes (18,000 ftin the United States). This is where the barometric altimeter settingis set to the standard setting of 29.92 inches of mercury, or 1013hPa or mb. Transition levels may differ from country to country.NOTEThe Synthetic Vision System and alerting functions use QNH(Barometric Pressure for Local altimeter Setting) operations.For QFE (Altitude Above Ground) operation the Synthetic VisionSystem must be disabled using the menu.3. Set the Navigation Mode (VOR/ILS or GPS) as needed, and setthe course setting as needed.4. During loss of aircraft power the ESI-500 will continue to displayattitude, altitude, airspeed, and heading (MAG-500 installationsonly) for approximately 1 hour. External sensor inputs such asGPS, VHF NAV functions, and ARINC 429 Heading will not beavailable unless an independent standby power source is providedto the sensors.CAUTION