Assignment 5: Geometric Design Standards

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CEE 4674 Homework 5 Spring 2009Hfeet = 61 - 0.094(Sfeet) - 0.003(Efeet)where S is equal to the most demanding wingspan of the airplanes using the runway and E is equal to the runway thresholdelevation above sea level. Using the airport elevation at Las vegas (LAS), for the Embraer 195 aircraft the dimension H is: H = 61- 0.094 (94.25) - 0.003 (2181) or 45.6 feet.Figure 5. Solution for OFZ Inner Transitional Surface.The solution depicted in Figure 5 illustrates the inner transitional surface.The dominant effect for the BRL is the Part 77 transitional surface. The Building is restricted to 850 feet from therunway centerline (see Figure 3).d)Research on the internet the differences between Categories 1, 2 and 3 of the instrument landing system (ILS). Findthe visibility minima allowed for landings under each type of ILS system.CategoryRunway Visual Range(feet)Decision Height (feet)Category I 2000 200Category II < 2000 and >= 1000 100Category IIIa < 1000 and >= 700 0Category IIIb < 700 and >=150 0Category IIIc < 150 and >= 0 0Problem #2a)For problem described on page 37 of the revised geometric design handout (Notes 9), design a transition curve for point B(see Figure 6). Specify the elevations (every 10 meters) as a function of the station (in meters). Refer to the formulas on page41 of the handout to create a symmetrical parabola. Do it in Excel or Matlab to simplify your work.The change in grade is 1.4% (from 1.1% to -0.3%) therefore the length of the transition curve us 1,400 feet (427 meters). Thepoint of intersection is located at station 1806 metric. Since the parabola is symmetrical the starting point of the transition curve islocated at station 5223.4 feet ((1806 - 427/2)*3.28) or metric station 1592.5.The elevation of Point B can be easily calculated to be 625.951 meters above mean sea level. The elevation of the starting pointof the transition curve is 625.951 - (427/2) * (1.1/100) = 623.6025 meters. Using the Matlab code provided in class the followingtransition curve is obtained (Figure 7). 4
CEE 4674 Homework 5 Spring 2009Figure 6. Runway longitudinal Grades for Problem 2.Figure 7. Transition Curve for Point B.b)Find the maximum permissible longitudinal grade for the first 200 feet of the runway safety area of the runwayshown in Figure 6.According to the FAA AC 150/5300-13 the maximum grade for the 200 foot runway safety area is -3%.Figure 8. FAA Maximum Permissible Runway Longitudinal Grades. 5
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Assignment 5: Geometric Design Standards

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