《空中交通运输系统》（英文版）chapter 14 avionic cert2

MIT ICAT Altimetry Standard Atmosphere Referenced 日29.92 inches of Hg 口3014mb Pressure Altitude O Altitude of Pressure in Std Atmosphere a Used above reference Flight Level (FL180 in US) Density Altitude a Altitude of density in Std Atmosphere Used for performance(TO) Barometric altitude a Estimated altitude corrected for surface pressure D MSL Altitude above Mean Sea Level (QNH) Q AGL Altitude above Ground Level(QFE) Radar Altitude(Cat I and Il Approaches u 5 cm radar- normally only below 3000ft (Terrain Noise Cabin Altitude(Pressurization)

MIT ICAT Altimetry y Standard Atmosphere Referenced † 29.92 inches of Hg † 3014 mb y Pressure Altitude † Altitude of Pressure in Std Atmosphere † Used above reference Flight Level (FL180 in US) y Density Altitude † Altitude of density in Std Atmosphere † Used for performance (TO) y Barometric Altitude † Estimated altitude corrected for surface pressure † MSL Altitude above Mean Sea Level (QNH) † AGL Altitude above Ground Level (QFE) y Radar Altitude (Cat II and III Approaches) † 5 cm radar - normally only below 3000ft (Terrain Noise) y Cabin Altitude (Pressurization)

MIT ICAT Airspeed Pneumatic Measurement based on Dynamic Pressure 口 Pitot and static Indicated Airspeed a Indicated on Instrument a Measurement of pressure on Aircraft(ie Load) O Used for structural operating limits Calibrated Airspeed a Pitot-Static Errors calibrated out a Used for Flight test and performance Groundspeed a Achieved speed over ground Mach number a Requires Static Air Temperature

MIT ICAT Airspeed y Pneumatic Measurement based on Dynamic Pressure † Pitot and Static y Indicated Airspeed † Indicated on Instrument † Measurement of pressure on Aircraft (ie Load) † Used for structural operating limits y Calibrated Airspeed † Pitot-Static Errors Calibrated out † Used for Flight Test and Performance y Groundspeed † Achieved speed over ground y Mach Number † Requires Static Air Temperature

② MIT ICAT Air Data Sensors · Pitot tube □ Heated for de-Ice Static Port 口 Location sensitive a Typically 1/3 Back on Fuselage on Conventional aircraft a Bilateral with crosstie to avoid Side Slip errors 口 Water drain Alpha vane □ Heated for De-|ce TAT Probe a Inertial Separator for Water □ Heated for De-|ce

MIT ICAT Air Data Sensors y Pitot Tube † Heated for De-Ice y Static Port † Location Sensitive † Typically 1/3 Back on Fuselage on Conventional aircraft † Bilateral with crosstie to avoid Side Slip Errors † Water Drain y Alpha Vane † Heated for De-Ice y TAT Probe † Inertial Separator for Water † Heated for De-Ice

MIT ICAT Temperature Static Air Temperature Ram rise Total Air Temperature

MIT ICAT Temperature y Static Air Temperature y Ram Rise y Total Air Temperature

MIT ICAT Integrated Air Data Systems Air Data Computer a Compensates out Static System Errors 口 Citation Example Air Data Heading and Reference Systems(ADHARS)

MIT ICAT Integrated Air Data Systems y Air Data Computer † Compensates out Static System Errors † Citation Example y Air Data Heading and Reference Systems (ADHARS)