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Temperature Error Correction TEC = 4' x (10,000' / 1,000') x -10? TEC = 4' x 10 x -10 TEC = 40 x -10 TEC = -400' True Altitude = Indicated Altitude +/- TEC 10,000' = Indicated Altitude - 400' Indicated Altitude = 10,000' + 400' Indicated Altitude = 10,400' Question 582: Given: An aircraft is flying at FL100, OAT = ISA - 15ºC. The QNH, given by a meteorological station with an elevation of 100 ft below MSL is 1032 hPa. 1 hPa = 27 ft Calculate the approximate True Altitude of this aircraft. A 9900 ft B 11200 ft C 10600 ft D 9400 ft Explanation: Start with calculating the pressure error followed by the temperature error. Pressure error = (actual pressure –altimeter setting) x pressure correction (30 ft/hPa unless otherwise specified) Pressure error = (1032 hPa –1013 hPa) x 27 ft/hPa = 513 ft The actual pressure is higher than the altimeter setting so the pressure error is added. True altitude before temperature correction = 10 000 ft + 513 ft = 10 513 ft The temperature error apply for the distance (height) above where the pressure reference was obtained from. Here the meteorological station is 100 ft below MSL, so the height above the station (before temperature correction) is: Height = pressure corrected altitude –elevation Height = 10 513 ft - (-100 ft) = 10 613 ft The formula for temperature error is: Temperature error = 4 ft x (heigh ÷ 1000 ft) x ºC ISA dev Temperature error = 4 ft x (10 613 ft ÷ 1000 ft) x -15ºC = -637 ft True altitude = pressure corrected altitude + temperature error True altitude = 10 513 ft + (-637 ft) = 9876 ft Question 583: With an increase in magnetic latitude there will be a decrease in the A directive force.
B angle of dip. C total magnetic force of the Earth's magnetic field. D vertical component of the Earth's magnetic field. Explanation: With the directive force being the horizontal component of the Earth's magnetic field, this will be strongest by the magnetic equator and weakest by the magnetic poles. This means the directive force is inversely proportional to latitude, i.e. as latitude increase the directive force will decrease. Question 584: Which statement about the duration of daylight is true? A Close to the equinoxes the influence of latitude on the duration of daylight is at its smallest. B In summer the length of the period of daylight decreases with increasing latitude. C On September 10th the duration of daylight is longer on the Southern Hemisphere than on the Northern Hemisphere. D Close to the solstices the influence of latitude on the duration of daylight is at its smallest. Explanation: Close to the equinoxes day and night will have roughly the same length all over the world although the days will be marginally shorter closer to the poles. Therefore it can be said that the influence of latitude on the duration of daylight will be the smallest. Question 585: Which figure in the Appendix represents the geocentric latitude of position P, which is situated above the surface of the ellipsoid?