a2_sol_cee4674_09

# a2_sol_cee4674_09 - Dr Antonio A Trani Associate Professor...

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NEXTOR/Virginia Tech - Air Transportation Systems Lab 1 Dr. Antonio A. Trani Associate Professor of Civil Engineering Virginia Polytechnic Institute and State University February 10, 2009 Blacksburg, Virginia

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NEXTOR/Virginia Tech - Air Transportation Systems Lab 2
NEXTOR/Virginia Tech - Air Transportation Systems Lab Problem # 1 a) Estimate the percentage of aircraft below 12,500 lb. that can be operated from Virginia Tech airport (BCB) on a routine basis. b) BCB wants to expand its current runway to serve 75% of the aircraft with weights below 60,000 lb. using the 90% useful load curves. Find the runway extension needed. c) What is the main drawback of the curves shown in FAA AC 5325-4b for aircraft below 60,000 lb.? Comment. 3

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NEXTOR/Virginia Tech - Air Transportation Systems Lab Solution to Part (a) 4 Airport: BCB (Blacksburg) – Airport elevation = 2,132 feet – Mean daily maximum temperature of the hottest month of the year = 83 o F – 0.4% grade up – Existing runway = 4539 feet 4,400 feet
NEXTOR/Virginia Tech - Air Transportation Systems Lab Solution to Part (a) To serve 100% of the population below 12,500 lb the airport needs ~4,400 feet of runway (uncorrected) Correct for grade at 10 feet for every foot of difference in runway elevation Delta Elevation = 4539 *0.4%/100% = 18.2 feet Correction = 182 feet Total runway length needed = 4,400 + 182 = 4,582 feet Therefore BCB is prepared (within 50 feet) to serve 100% of the aircraft population whose MTOW < 12,500 lb. 5

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NEXTOR/Virginia Tech - Air Transportation Systems Lab Solution to Part (a) Small Aircraft with 10 or More Passenger Seats 6 Airport: BCB (Blacksburg) – Airport elevation = 2,132 feet – Mean daily maximum temperature of the hottest month of the year = 83 o F – 0.4% grade up – Existing runway = 4539 feet 4,400 feet
NEXTOR/Virginia Tech - Air Transportation Systems Lab Solution to Part (a) Aircraft with 10 Passenger Seats or More To serve 100% of the population below 12,500 lb the airport needs ~4,400 feet of runway (uncorrected) Correct for grade at 10 feet for every foot of difference in runway elevation Delta Elevation = 4539 *0.4%/100% = 18.2 feet Correction = 182 feet Total runway length needed = 4,400 + 182 = 4,582 feet Therefore BCB is prepared (within 50 feet) to serve 100% of small aircraft with 10 seats or more. 7

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NEXTOR/Virginia Tech - Air Transportation Systems Lab Use Figure 3-1 and 75% of fleet with 90% useful load Runway length = 6,700 feet (without correction) 8 Part (b) Runway Length Calculation Mean daily maximum temperature o F
NEXTOR/Virginia Tech - Air Transportation Systems Lab 9 Runway Length Estimation (BCB) Corrections Effective gradient correction ( takeoff case ) – Increase runway length by 10 feet (3.05 meters) for every foot (0.305 meters) of runway elevation difference (low-high) – 0.4% grade implies a delta elevation of around 18 feet Increase Runway Length by 180 feet (or 6880 feet)

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## This note was uploaded on 01/07/2012 for the course CEE 4674 taught by Professor Staff during the Fall '11 term at Virginia Tech.

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a2_sol_cee4674_09 - Dr Antonio A Trani Associate Professor...

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