14_avionic_cert2

14_avionic_cert2 - MIT ICAT MIT ICAT Altimetry y Standard...

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Unformatted text preview: MIT ICAT 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 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 MIT ICAT 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 MIT ICAT Temperature y Static Air Temperature y Ram Rise y Total Air Temperature MIT ICAT 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) MIT ICAT MIT ICAT Heading y Magnetic Compass ¡ Variation (Magnetic Deviation ¡ Deviation (Magnetic materials) ¢ DC9 Example ¡ Compass Card (Calibrated with Radios and Equip on) y Flux Gate Compass ¡ Electronic Magnetic Compass ¢ Normally in Tail for deviation y Gyro Compass ¡ Precession ¡ Slaved Flux Gate y Turn Coordinator ¡ (Rate Gyro) MIT ICAT MIT ICAT Inertial Reference Unit y Integrate acceleration from known position and velocity ¡ Velocity ¡ Position y Need Heading ¡ Gyros ¢ Mechanical ¢ Laser y Can get Attitude ¡ Artificial Horizon (PFD. HUD)Artificial Horizon (PFD....
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This note was uploaded on 11/08/2011 for the course AERO 16.851 taught by Professor Ldavidmiller during the Fall '03 term at MIT.

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14_avionic_cert2 - MIT ICAT MIT ICAT Altimetry y Standard...

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