Estimating the Impact of En route Convective Weather on General Aviation and Air Taxi Operations

2006 ◽  
Author(s):  
Dan Howell
Keyword(s):  
General Aviation ◽  
Convective Weather ◽  
The Impact

scholarly journals How Late Does Your Flight Depart? A Quantile Regression Approach for a Chinese Case Study

2020 ◽  
Vol 12 (24) ◽  
pp. 10553
Author(s):  
Zhe Zheng ◽  
Wenbin Wei ◽  
Bo Zou ◽  
Minghua Hu
Keyword(s):  
Least Square ◽  
Ordinary Least Square ◽  
Delay Propagation ◽  
Weather Information ◽  
Time Performance ◽  
Buffer Time ◽  
Aircraft Type ◽  
Main Components ◽  
Convective Weather ◽  
The Impact

Flight departure delays cost airlines and airports millions of dollars and become a systematic problem. The on-time performance at an airport is connected to and easily affected by delay propagation from previous operations of flights using the airport. In this paper, we employ both Ordinary Least Square (OLS) and quantile regressions to investigate the impact of various influencing factors on flight departure delay. By using historical flight records and weather information, the impacts of delay propagation-related and other factors are quantified to study the correlations between the explanatory and response variables. Three variables, including previous arrival delay, turnaround buffer time, and the first order of a day, are used to examine the propagation effects. We find that aircraft type, flying on a weekday, and being the first flight of a day have significant impacts on short departure delays. Ground buffer is conducive to mitigating delay propagation. For long delays, however, ground buffer cannot work in an efficient way, and the previous arrival effect is more important. Convective weather and aircraft type are the crucial factors in this situation. Interestingly, flying on a weekday suddenly becomes one of the main components under extreme delays. Meanwhile, propagated delay and airport congestion remain significantly impactful on the on-time performance.

Crashworthiness Simulation Analysis of Light Sport Aircraft Fuselage Structure

2011 ◽  
Vol 199-200 ◽  
pp. 48-53 ◽  
Author(s):  
Pu Woei Chen ◽  
Shu Han Chang ◽  
Yu Yang Hsieh ◽  
Tai Sing Sun
Keyword(s):  
Simulation Analysis ◽  
Impact Angle ◽  
General Aviation ◽  
Aviation Industry ◽  
Aircraft Fuselage ◽  
Passenger Safety ◽  
Engine Mount ◽  
Distance Travel ◽  
Impact Angles ◽  
The Impact

In recent years, light sport aircraft, which not only serve the purpose of personal recreation but also act as a means of transportation for medium and short distance travel, have rapidly gained popularity in the general aviation industry worldwide. The FAA established regulations for this new category of airplanes in 2004. However, the crashworthiness requirements for this type of airplane have not been clearly specified. This study used the finite element method to investigate the effect of the impact angle and speed of the LSA fuselage structure on passenger safety during a crash event. We used sink speed defined by NASA AGATE, ASTM and FAR as parameters. The passenger compartment reducing rate defined by MIL-STD-1290A was used for a safety boundary condition. The results show that the maximum cockpit reducing rate of the airplane impact angle is 30o. When the impact angle increases, owing to the engine mount and fire wall’s reinforced structure, this type of airplane can sustain a greater vertical drop speed. When the impact angle is about 80°~90°, the maximum impact speed the fuselage that can be sustained is 33 m/s. This work also completed a simulation of safe and unsafe ranges for light sport aircraft at various impact angles and vertical drop speeds during impact.

Tactical vs. Strategic Behavior: General Aviation Piloting in Convective Weather Scenarios

2002 ◽  
Vol 46 (1) ◽  
pp. 101-105 ◽  
Author(s):  
Kara A. Latorella ◽  
James P. Chamberlain
Keyword(s):  
Perceived Risk ◽  
Strategic Behavior ◽  
Meteorological Conditions ◽  
General Aviation ◽  
Theoretical Research ◽  
Environmental Characteristics ◽  
Experimental Conditions ◽  
Weather Information ◽  
Information Cues ◽  
Convective Weather

We commonly describe environments and behavioral responses to environmental conditions as “tactical” and “strategic.” However theoretical research defining relevant environmental characteristics is rare, as are empirical investigations that would inform such theory. This paper discusses General Aviation (GA) pilots' descriptions of tactical/strategic conditions with respect to weather flying, and evaluates their ratings along a tactical/strategic scale in response to real convective weather scenarios experienced during a flight experiment with different weather information cues. Perceived risk was significantly associated with ratings for all experimental conditions. In addition, environmental characteristics were found to be predictive of ratings for Traditional IMC (instrument meteorological conditions), i.e., aural weather information only, and Traditional VMC (visual meteorological conditions), i.e., aural information and an external view. The paper also presents subjects' comments regarding use of Graphical Weather Information Systems (GWISs) to support tactical and strategic weather flying decisions and concludes with implications for the design and use of GWISs.

Examination of Convection-Allowing Configurations of the WRF Model for the Prediction of Severe Convective Weather: The SPC/NSSL Spring Program 2004

2006 ◽  
Vol 21 (2) ◽  
pp. 167-181 ◽  
Author(s):  
John S. Kain ◽  
S. J. Weiss ◽  
J. J. Levit ◽  
M. E. Baldwin ◽  
D. R. Bright
Keyword(s):  
Weather Forecasting ◽  
Wrf Model ◽  
Value Added ◽  
Severe Weather ◽  
Convective Initiation ◽  
A Value ◽  
Human Decision ◽  
Forecast Models ◽  
Convective Weather ◽  
The Impact

Abstract Convection-allowing configurations of the Weather Research and Forecast (WRF) model were evaluated during the 2004 Storm Prediction Center–National Severe Storms Laboratory Spring Program in a simulated severe weather forecasting environment. The utility of the WRF forecasts was assessed in two different ways. First, WRF output was used in the preparation of daily experimental human forecasts for severe weather. These forecasts were compared with corresponding predictions made without access to WRF data to provide a measure of the impact of the experimental data on the human decision-making process. Second, WRF output was compared directly with output from current operational forecast models. Results indicate that human forecasts showed a small, but measurable, improvement when forecasters had access to the high-resolution WRF output and, in the mean, the WRF output received higher ratings than the operational Eta Model on subjective performance measures related to convective initiation, evolution, and mode. The results suggest that convection-allowing models have the potential to provide a value-added benefit to the traditional guidance package used by severe weather forecasters.

scholarly journals A Study of Commuter Aircraft Design

1977 ◽  
Author(s):  
T. L. Galloway
Keyword(s):  
Aircraft Design ◽  
General Aviation ◽  
Performance Constraints ◽  
Excellent Growth ◽  
And Performance ◽  
The Impact ◽  
Definition Phase ◽  
Engine Type ◽  
General Aviation Aircraft

Commuter airlines have generally demonstrated excellent growth in recent years. This growth has been accomplished mainly with aircraft that have evolved from larger general aviation aircraft or specially designed utility aircraft. None reflect a configuration optimized for the current type of passenger service early in the vehicle definition phase. This paper investigates the impact of configuration considerations, mission requirements, and performance constraints on conceptual commuter aircraft designs. Emphasis is placed on direct comparisons between turbofan and turboprop powered aircraft in the 10–30 passenger class. The analysis is accomplished using a computerized aircraft synthesis model that simulates the aircraft design and mission. The resulting conceptual aircraft are similar in size and performance regardless of engine type but the turboprop offers more mission flexibility.

Performance Trends for Portland Cement Concrète General Aviation Pavements in Illinois

1996 ◽  
Vol 1524 (1) ◽  
pp. 194-202 ◽  
Author(s):  
Thomas Van Dam ◽  
James Bildilli
Keyword(s):  
Portland Cement ◽  
Element Model ◽  
General Aviation ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Actual Performance ◽  
Deterioration Rate ◽  
Performance Trends ◽  
And Performance ◽  
The Impact

The deterioration and performance of portland cement concrete general aviation (GA) airport pavements in Illinois are discussed. Two popular design procedures are reviewed, and typical GA pavement sections are structurally evaluated by using the ILLI-SLAB finite-element model. Subjected to GA pavement loading conditions, 125- and 150-mm-thick slabs would be considered structurally adequate, whereas 100-mm-thick slabs would not be expected to perform well. It was determined that slab size, as determined by the ratio of the slab length over the radius of relative stiffness (L/ l) was strongly correlated to pavement distress and performance. As the slab size was increased higher incidences of distress at higher severity levels were observed. Performance trends were identified by using a deterioration rate approach that accounts for the performance of individual sections. It is believed that this procedure reflects actual performance trends by addressing the issues of long-lived pavement sections, the impact of maintenance, and the influence of inspection variability.

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