5 airport-geometric design-2
TRANSCRIPT
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GEOMETRIC DESIGN OF AIRPORTS(2)
CVLE 535AIRPORT ENGINEERING
Dr. Youssef Attallah
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Aircraft Manoeuvring Principles
Aircraft use tricycle landing gear configurations
Special manoeuvring requirements need to be accounted for Tricycle gears are less stable than four
wheelers Tricycle gears permit tighter manoeuvres
Always consult with the aircraft manufacturer documents for airport design
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Sample Aircraft Manoeuvring EnvelopesBoeing MODEL 777-200LR, 777F
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Steering angle= angle defined by the aircraft longitudinal axis and the nose gear (usually up to 70 degrees for some aircraft)
Few Definitions
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Turning Center= the imaginary point where the aircraft pivots while turning at a given steering angle.
Turning center
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Sample Aircraft Manoeuvring (B777-300)
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While steering angles as high as 60-70 degrees are technically possible in some aircraft, it is unwise to ask pilots to use such high steering angles in practice while on a taxiway
Very high steering angles are typically associated with apron manoeuvring (while aircraft is moving at very low speeds)
Consider the pilot visibility when designing your airport infrastructure. Aircraft have limited frontal and lateral visibilities
Consult the appropriate aircraft manuals when in doubt
Operational Issues
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Sample Aircraft Forward Visibility
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Apron design requirementsTaxiway design requirementsTaxilane design requirementsRunway exit design requirementsHolding bay design
Implications of Aircraft
Manoeuvring
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Taxiway Design Standards and Requirements
Source: FAA AC 5300-13 (Chapter 4)
Dictated by safety analysesProvide sufficient taxiway and runway-
taxiway intersection width to avoid accidents (i.e., landing gears go into the shoulder or grass)
Use simple FAA criteria to design taxiway-taxiway or taxiway-runway intersections
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Where is the Info. in FAA AC 150/5300-13 ??
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Taxiway Dimensional Standards (per FAA)
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Why Do We Need Taxiway Fillets?
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Taxiway Fillet Design Rationale
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Taxiway Fillet Design Solution
Critical DimensionsR - Radius of CLL - Length of filletF - Inner fillet radiusW - Width of taxiway
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Taxiway Fillet Design Standards (per FAA)
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According to FAA the following equivalent design procedures can be used instead of the values in the previous table
Taxiway safety area equals the aircraft wingspan
Taxiway OFA (Object Free Area) equals 1.4 times the critical aircraft wingspan + 20 ft. (6 m.)
Taxilane OFA (Object Free Area) equals 1.2 times the critical aircraft wingspan + 20 ft. (6 m.)
Taxiway Design Equivalencies
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Example: Taxiway Intersection for B777-300
Look at Boeing 777-300 airport compatibility documents
Aircraft fits design group V (< 213 ft. wingspan) – 212 ft. in wingspan
31.22 m (102 ft. and 5 inches) of wheel base
10.97 m (36 ft.) of wheel track (between center of main landing gear struts)
Goal:Design a suitable taxiway-taxiway intersection for a Boeing 777-300
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Boeing 777-300 (per Boeing data)
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From Table 4-2 in the FAA AC 150/5300-13 obtain the following parameters:
R = 150 ft. (radius of taxiway)
L = 250 ft. (lead-in fillet)
F = 85 ft. (fillet inner radius - centerline tracking)
W = 75 ft. (taxiway width)
Use FAA Criteria for Taxiway Fillet Design
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Solution Drawing
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Some minor problems are identified
The aircraft has a long wheel base and thus track-in distances are excessive
According to Boeing the distance from the pavement edge to the outer wheel is 4.0 m (14 ft.)
This is below the FAA required value of 15 ft. (4.5 m.)
See the examples in the following pages
Reality Check (with Manufacturer)
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Sample Solution for Boeing 777-300
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Sample Solution for Boeing 777-300
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Example Boeing 777-300 Taxiway-Taxiway
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Recall FAA Table 4-1 (AC 150/ 5300-13)
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Large paved areas to hold more than one aircraft at a time near a runway end
Provide the physical space for a runway departure queue
Provide operational flexibility to ATC personnel to sequence aircraft in a departure queue
Should be simple for pilots to use them adequately
Some busy airports use 5-6 holding bays
Holding Bays
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Sample Holding Bay (Boeing 777-300)
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Taxiway Fillet Design (Table 4-2)
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Use detailed add-on packages to Autocad such as Autoturn software (from Transoft Solutions)
Use FAA AD42 software (approximate techniques to study aircraft kinematics on the ground)
Detailed Aircraft Trajectory Analysis
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FAA AD42 Program Screens