Professionals Dedicated to the Safety of Systems, Products, and Services
© Organized 1962 Incorporated 1973
The WDC Chapter Training Symposium will be held at the beautiful LaPlata Campus of the College of Southern Maryland in Charles County
Taxi-Into-Position-and-Hold Safety Risk Assessment
Instructor: Mr. Gregory Y. Won
Track 4 - System Safety & Engineering Design Systems Relationships
Tuesday, 8:00 AM - 9:45 AM
Course Abstract:
This course provides a step-by-step description of the methodology used to evaluate the risks associated with an air traffic control procedure called "Taxi-Into-Position-and-Hold" (TIPH). TIPH is a procedure in which an aircraft is positioned on the runway for imminent departure. Under the alternative, the aircraft is required to hold short of the runway, until the air traffic controller determines that the runway would be clear of conflicting traffic by the time the aircraft, upon departure clearance, enters the runway and initiates takeoff. Students will find this a useful case study in that it has elements common to many government and industry projects: compressed timeframe, lack of an accident history, paucity of operational data, and potentially significant economic consequences that depend on the results of the safety analysis.
The course has five parts: (1) description of the TIPH procedure and discussion of its safety and capacity impacts, (2) development of a model representation of the procedure that identifies possible accident scenarios, (3) development of estimates of the conditional probabilities of alternative accident scenarios based on an analysis of accident/incident data and simulation modeling, (4) sensitivity analysis, (5) discussion of the advantages and limitations of the methodology.
Topic Learning Objectives:
1. Students will gain a basic understanding of the Safety Risk Management Process
a. Definitions
b. Hazard Identification
c. Analyzing and Assessing Risk
d. Controlling and Monitoring Risk
e. Risk Communication
2. Students will gain a basic understanding of Event and Fault Tree development
a. Inductive and Deductive Reasoning
b. Introduction to Event Trees
3.Students will gain a basic understanding of the process of estimating accident scenario probabilities
a. Principle of Decomposition
b. Lack of operations data
c. Absence of an accident history
d. Sensitivity analysis
4. Students will gain a basic understanding of the limitations of the methodology described in this course
Student Requirements:
· Students are required to actively participate in class discussions
· Students are required to have a calculator and the proper tools necessary to take notes
Instructor Bio:
Gregory Y. Won manages the Policy and Standards Staff of the Air Traffic Safety Oversight Service, Federal Aviation Administration, and is responsible for supervising research and analyses to establish national and international safety standards for the provision of air traffic services. In addition to the subject of this course, he has led studies on numerous aviation-related safety topics including: Terrain Awareness and Warning Systems, aircraft structural fatigue damage, rejected takeoff and landing distances, and turbine engine rotorburst. Previously, he was a senior economist at the Centers for Medicare and Medicaid Services where he developed 75-year computable general equilibrium projection models of the U.S. economy and medical care system. Mr. Won has a B.A. in mathematics and economics from Johns Hopkins University, and an M.A. in economics from the University of Michigan.
