Example 2 Hourly Capacity of the Runway Component Determine VFR and IFR hourly

Example 2 hourly capacity of the runway component

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Example 2 - Hourly Capacity of the Runway Component Determine VFR and IFR hourly capacities of the airport depicted below. In the typical busy hour, it has 13 single-engine, 10 light multi-engine, 25 transport type ( 300,000 lbs.) and two wide-body operations (> 300,000 lbs.). During VFR conditions, arrivals constitute 45 percent of the operations and there are three touch and gas. During IFR conditions, the busy hour count of small aircraft operations drops to two single- engine and five light twin-engine aircraft and arrivals constitute 55 percent of the operations. There are no touch and go operations during IFR conditions. The airport typically operates with arrivals on one runway and departure on the other.
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5-13 Solution (1) Demand. Enter the forecast demand applicable to the capacity determination in column 1 of the worksheet shown below. (VFR = 13+10+25+2 = 50, IFR = 2+5+25+2 = 34) DEMAND RUNWAY-USE CAPACITY FIGURE NO. AIRCRAFT MIX MIX INDEX %(C+3D) ARRIVALS % TOUCH AND GO % RUNWAY EXITS HOURLY CAPACITY BASE C* T & G FACTOR T EXIT FACTOR E HOURLY CAPACITY C* T E DIAGRAM NO. VFR IFR %A %B %C %D LOCATION NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 50 43 3-27 26 20 50 4 62 45 12 45 60 2 89 1.06 .94 89 34 43 3- 59 6 15 73 6 91 55 0 60 1 53 1.00 .97 51 (2) Runway-use. From Figure 2-4 , the runway-use configuration diagram is No. 43. Enter this diagram number in column 3, and a line sketch of the configuration in column 2. (3) Capacity Figure(s). From Figure 2-4, diagram No. 43 the appropriate FAA figures for determining capacity are No. 3-27 for VFR conditions and No. 3-59 for IFR conditions. These VFR and IFR references are entered on the line in column 4 based on the weather conditions. (4) Mix Index. This is calculated using data provided in the example statement, as shown below.
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5-14 Aircraft Class VFR IFR Number of Operations Percent of Operations Number of Operations Percent of Operations A 13 26 2 6 B 10 20 5 15 C 25 50 25 73 C 2 4 2 6 Total 50 100 34 100 The percent of operations by each aircraft class is recorded in columns 5 through 8. The mix indices are calculated and entered in column 10. VFR= 50+ 3(4) = 62 IFR=73 +3(6) = 91 (5) Percent Arrivals. The percent arrivals are given as 45 for VFR conditions, and 55 for IFR conditions. Enter in column 11. (6) Hourly Capacity Base (C*). Obtain C* from Figure 2·5 for VFR and Figure 2-6 for IFR, and enter in column 15. (7) Touch and Go Factor (T). The statement specified 3 touch and go operations during VFR and none in IFR. Since a touch and go is a landing and a takeoff (2 operations), the percent of touch and go operations in VFR conditions is 6/50 or 12 percent. Obtain the touch and go factor T from Figure 2-5 for VFR and 2-6 for IFR and enter in column 16. (8) Exit Factor E. A landing aircraft might exit at any one of the four right-angled exits located 3000, 4500, 6000 and 8000 feet from the threshold. For dual runway operation, do not consider the runway intersection as a potential exit. From figures 2-5 for VFR and 2-6 for IFR, determine the exit range and the exit factor E.
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  • Spring '14
  • UlreenO.Jones
  • ........., Instrument flight rules, Visual flight rules

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