RAA Convention Fatigue Science Initiatives
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1 RAA Convention Fatigue Science Initiatives Capt. Kevin Hiatt Dr. Hans Van Dongen 1
2 About the Foundation Independent Mission: To pursue the continuous improvement of global aviation safety and the prevention of accidents. Established in 1947 Not-for-profit Impartial Ability to Speak Truth to Power International 2
3 Comments & Questions 3
4 Activities of the Foundation Research Education Advocacy Facilitation Publishing Corporate Aviation Support Convene Industry Forums Media Independent Voice 4
5 AeroSafety World Leading Global Aviation Safety Magazine Estimated 200,000 monthly distribution in 3 languages 5
6 Operators Guide to Human Factors in Aviation 6
7 Fatigue Science Initiatives Issues & Questions Colgan Accident - Pivotal Event Actions - Global Issue, Symposiums, Studies, Articles Emerging Questions - Multi Segment Ops/Workload Independent Study - Research/Study to Address Gaps Washington State University Dr. Hans Van Dongen 7
8 Fatigue Science Initiatives Hans Van Dongen, Ph.D. Research Professor
9 Fatigue is Determined by Sleep/Wake History (Time Awake) and Circadian Rhythm (Time of Day) Prior sleep and wakefulness + Time of day Activation Activation Alertness/ fatigue Alertness Daytime duty hours
10 Fatigue is Determined by Sleep/Wake History (Time Awake) and Circadian Rhythm (Time of Day): Nighttime Duty Prior sleep and wakefulness + Time of day Activation Activation Alertness/ fatigue Alertness Nighttime duty hours
11 Fatigue Risk Management: a Commitment to Safety Reason s Swiss Cheese Model of Accident Causation
12 Context for Fatigue Science in Operational Settings: Neurobiological and Operational Factors for Fatigue countermeasures duty hours (timing & duration) relative risk of errors, incidents and accidents modulators in the environment weather, sea state, distractions, illness, work demands, etc. (mostly transient) light instability time on task ~ sleep inertia fatigue (cognitive impairment) Neurobiological comes with the individual Operational comes with the task at hand
13 Table B to 14 CFR Part 117 Flight Duty Period: Unaugmented Operations Part 117 regulates flight duty period, and by extension time awake, as a function of time of day, in accordance with sleep science. Part 117 also regulates flight duty period as a function of number of flight segments (i.e., workload), but without scientific basis. 2010: the WSU RAA Pilot Fatigue Study set out to fill this science gap.
14 Effect of Workload on Fatigue during Sleep Deprivation Workload: high (2 nd ½) high (1 st ½) moderate Psychomotor Vigilance Task (PVT)
15 WSU RAA Fatigue Study, Phase I: Development of a Mathematical Fatigue Model That Accounts for Workload increasing fatigue equilibrium scheduled sleep pre/post-flight take-off en-route landing
16 Comparing FAA s 2010 Notice of Proposed Rule Making to Earlier ARC Recommendations FAA: 9.5 h duty Start 05:00, 6 segments ARC: 11 h duty increasing fatigue
17 RAA s Comments to Notice of Proposed Rule Making Time of Start (Home Base) 1 Flight Segment (9) 10 (9) 10 (9) 10 (9) (9) 10 (9) 10 (9) 10 (9) (9) 10 (9) (11) 12 (11) 12 (11) 12 (11) 11.5 (10) 11 (9.5) 10.5 (9) (11) (11) (11) (11) (11) (11) Important caveat: these results were preliminary in nature, by design, as the Phase I fatigue model was yet to be operationally validated. The WSU RAA Fatigue Study, Phase II sought to validate the fatigue model of Phase I for multi-segment operations.
18 WSU RAA Fatigue Study, Phase II: Simulator Study Scientific Steering Committee 2 independent scientists 3 representatives of Air Wisconsin 3 ARW MEC and ALPA representatives 1 representative of the RAA
19 Flight Simulator Study Design and Participants The simulator study involved a 4-day pairing. Days 2 and 3 were simulator days, each with a 9-hour duty period, flown like revenue flights. Day 1: following a rest day, deadhead to simulator location (CLT) and meet at crew hotel for briefing at 17:00. Day 2: fly multi-segment or single-segment simulator scenario. Day 3: fly single-segment or multi-segment simulator scenario. Day 4: deadhead back to domicile. Study volunteers were 24 active-duty pilots (12 Capt, 12 FO), randomly selected from among Air Wisconsin lineholders. Flight Experience (hours) 12,000 10,000 8,000 6,000 4,000 2,000 0 CRJ-200 Capt FO Capt FO
20 Schematic of the Two Simulator Trips Flown by Each Crew plane swap STL SPI SPI DFW DFW CRP CRP IAH IAH LIT Time of Day (hours) MIA SEA Duty Period (9 hours) Psychomotor Vigilance Task (PVT) testing reaction time (ms) reaction time (ms) h awake (13:00) time on task (s) time on task (s) time on task (s)
21 Fatiguing Effect of Multi-Segment Duty Day as Compared to Single-Segment Duty Day: Model Validation (Preliminary) 1.6 Observed Predicted Relative Fatigue F 1,8 =21.7 P=0.002 RMSE=0.24 R 2 =73.1% Time of Day (hours) Duty Period (9 hours)
22 WSU RAA Fatigue Study, Phase III: Fatigue Risk Management Systems and Model-Based Fatigue Risk Management Alertness SAFTE/FAST (% effectiveness) % efficiency LR Predicted Predicted Fatigue fatigue in in Hour hour of of arrival Arrival ULR Scheduled flight duration
23 The Future of Model-Based Fatigue Risk Management? computer optimization duty hour guidelines personnel characteristics and qualifications personnel availability resource availability schedule redundancy needed for robustness other operational constraints possible duty schedules efficiency cost fatigue other relevant outcomes model-based fatigue predictions duty schedules and rosters
24 Acknowledgments Air Wisconsin Airline Corporation Air Wisconsin Pilots, ARW MEC, and ALPA National CAE (CRJ-200 flight simulator) SSC: Dr. Lynn Caldwell (US Navy, independent scientist), Dr. Peter Demitry (ALPA, scientific consultant), Bob Frisch (Air Wisconsin, VP Flight Ops), Richard Swindell (ARC MEC, Chairman), Ryan Gibson (Air Wisconsin, Regional Chief Pilot), Matthew Hintze (ARW MEC), Paul Preidecker (Air Wisconsin, Chief Flight Instructor), Scott Foose (RAA, SrVP), and Dr. Hans Van Dongen (WSU, principal investigator) Study execution committee: Ryan Gibson, Matthew Hintze, Paul Preidecker, Sandy Pierson, and many Air Wisconsin employees working in the background Simulator instructors: Jason Weirick and Judd Brinkman WSU research assistants: Kimberly Honn and Brieann Satterfield WSU fatigue modeler: Peter McCauley Regional Airline Association
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