Pressure altitude readingsQNH – is the mean-sea-level (MSL) pressure resulting from the barometric measured at the station by computing the weight of an unreal air column covering from the station to the sea levelVFR – are a set of regulations that a pilot guide a pilot in operating an aircraft. QNE – can be described as the altitude readings on the altimeter when the aircraft touches down and the altimeter sub-scale set at 1013. Alternatively, in other terms, it is the accepted ISA standard pressure set at 1013.2 hPa. Operation of a basic electronic flight instrument system, including the air data computer, and the EFIS system The EFIS is a flight deck display system, which uses electronic technology rather than electromechanical (Clancy, 1975, p.
147). A distinctive EFIS system consists of an Electronic Horizontal Situation Indicator (EHSI) and Electronic Attitude Direction Indicator (EADI); however, some designs integrate these two components. The EADI is attached directly to the autopilot with its display serving as a monitor that the pilot uses to observe the flight progress. The EADI additionally provides the necessary steering information that the pilot can follow.
The EHSI is a single instrument that replaces several instruments that are preferably found on conventional aircraft. The EHSI performs distinct functions including an aeronautical map, weather information, heading flown, distance, time to go, and ground speed. The main difference between lifeless and electrical pitot-static instruments systemThe mechanical system uses manual individual instruments to calculate and compare each component of data such as calculating the rate of climb, Mach number, and airspeed. The electrical system air data computer (ADC) to do all the calculation and comparison and finally display the final data on a central monitor. State main differences in maintenance techniques between maintaining mechanical and electrical pitot-static instruments Maintenance of mechanical system are difficult and complex as compared to an electrical system.
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