• Lab Report
• 21

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A density altitude of 2,500 ft MSLA density altitude of 500 ft MSLA density altitude of 0 ft MSLA higher density altitude implies your aircraft will behave as if it’s higher in thestandard atmosphere, where the air is less dense. With less dense air, the aircraftwill experience less lift and thrust leading to longer take-off rolls.0 / 4 ptsQuestion 25UnansweredUnansweredAt which location below would higher than normal summer temperatures mostlikely pose the greatest risk with regards to density altitude considerations (e.g.,longer than normal take-off roll)?Correct AnswerCorrect Answer
0 / 4 ptsQuestion 26UnansweredUnansweredIf the temperature was 25C at an airport with a station elevation of 1,500 feet,what would be the density altitude correction,i.e., how much additional heightwould need to be added to the pressure altitude to obtain the density altitude?Correct AnswerCorrect Answer
1,200 feet1,080 feetIncorrect.The standard temperature at 1,500 feet is 12.This is becausethe standard temperature at mean sea level is 15C and standardtemperature decreases 2C for every 1,000 feet.Thus the standardtemperature would decrease a total of 3C between mean sea level and1,500 feet giving standard temperature of 12C (15-3=12) .Because ofthis, the actual temperature of 25C is 13C warmer than standard at thatelevation, i.e., 25 - 12 = 13.Finally, using the rule of thumb, the necessarycorrection for density altitude would be 13 x 120 = 1,560 feet.Thus, the DAwould be 1,560 feet greater than the PA.oooooo0 / 4 ptsQuestion 27UnansweredUnansweredIf the DA calculated using a either Chart style one or two yielded a density altitudeof 3,000 feet, what would be theapproximateDA if a dew point of 13C were
included in the calculation?
3,130 feet3,260 feetCorrect AnswerCorrect Answer3,390 feetIncorrect.The humidity rule of thumb (ROT) is that the correction (in feet) isequal to the dew point (in Celsius) times 20 ("double the dew point and addzero").Since the dew point is 13C, the approximate correction would be260 feet.Thus, DA = 3000+260 = 3,260 feetoQuiz Score:0out of 100
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