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This study was based on a portion of data collected in the first half of a proposed two-part survey examining the effects of unstable airline working conditions on pilots and their families. The survey was a descriptive, exploratory investigation of two pilot groups (n = 425). Data were drawn from a random sample of those pilots (n = 205) employed by an airline with chronic unstable working conditions, and those pilots (n = 220) employed by airlines with stable conditions. Several major variables from a multi-dimensional systems model of stress were selected to evaluate differences in stress symptoms, life event strains, family resources, and perceptions of control between pilot groups and between spouse groups. A major hypothesis tested by this report was that increases in pilot stress symptomology would be related to unstable airline working conditions. When differences between pilot groups and spouse groups were analyzed on the Family Inventory of Life Events (FILE), a self report symptoms of stress scale (SOS), the Family Adaptability and Cohesion Evaluation Scales (FACES III), and the Attribution Questionnaire, pilots and spouses found to have the highest stress symptoms and total family strains were those from the unstable airline. In addition, a large subtotal of pilot families across carriers were found to be low functioning families. The results of the study document the importance of unstable airline working conditions as an explanatory variable in examining pilot stress. It is suggested that understanding the pilot stress process depends on the recognition of work/family/individual systems interdependence. Implications of findings and directions for future research were presented. / M.S.

Pilots and other aircrew members are often required to perform tasks involving a substantial amount of mediational or cognitive activity. Generally speaking, workload estimation techniques have not been tested to determine their relative sensitivity and intrusion to mediational piloting tasks. An experiment comparing the sensitivity and intrusion of eight workload estimation techniques was conducted using a mediational loading task in a three-degrees-of-freedom moving-base aircraft simulator. The primary task mediational loading required the pilots to solve a variety of navigational problems while maintaining straight-and-level flight. The presented problems were sorted prior to the experiment into low, medium, and high difficulty problems. The eight techniques included opinion measures (modified Cooper-Harper rating scale and multi-descriptor rating scale), spare mental capacity measures (time estimation and tapping regularity), primary task measures (mediational reaction time and control movements per unit time), and physiological measures (pulse rate variability and pupil dilation). A sensitive technique was defined as a technique which indicated statistical differences of scores across the three mediational load levels. An intrusive technique was defined as a technique which significantly changed the primary task measures compared to the primary task measures obtained in a control condition. One opinion measure (modified Cooper-Harper measure (time (mediational rating scale), one estimation), and one spare mental capacity primary task measure reaction time) demonstrated sensitivity. Mediational reaction time demonstrated sensitivity to all levels of load. The other two showed partial sensitivity to load. One spare mental capacity measure (time estimation) demonstrated intrusion on two primary task measures (mediational reaction time and percent error response). / Ph. D.

The focus of this creative six-hour non-fiction project has been the documentation of personal narratives (i.e., oral histories) of Huntington County pilots and aviatrixes who flew during the early to mid-twentieth century. Twenty profiles have been chronicled in alphabetical order. Types of flight experiences range from leisure, to military and private instruction, to cross-country trips, to wartime flight, and finally, to the work of an aerial photographer. From a local standpoint, regional aviation history has been documented. On a national scale, Huntington County aviation represents an era of flight occurring nationwide. By the inclusion of photographs, logbook entries, letters, journals, and poems a pictorial history reveals a depth of story that words alone can not convey. Each story in this project was read numerous times to the interviewee to ensure that names, quotes, dates, and facts were correct. Defining Flight documents a time period of aviation when men and women were adventurous, curious, daring, and willing to test the winds with kite-like machines. / Department of English

D.Litt et Phil. (Clinical Psychology) / Please refer to full text to view abstract

Since human errors are one of the major causes of flight accidents, the design and operation of the modern aircraft system deals with them seriously. Particularly, the pilot workload on aviation causes human errors. Whenever new procedures are introduced and operated, the aircraft capabilities have been checked in every aspect. However, there has been little study on the impact of the new procedures such as LDLP, SCDA, SATS, and Steep Angle approach on the pilot performance, workload, and stress. In this study, different methods have been tried to understand the relationship between new procedures and the pilots in terms of performance, workload, and stress. The flight factors (e.g. flight experience, gliding angle, and approach area) were examined by the pilot performance, workload, and stress at the "Final Approach to L/D" phase using the single engine Cessna 172R type flight simulator. Five students and five instructor pilots from Embry-Riddle Aeronautical University in Dayton Beach, Florida, participated and they flew under four different simulation tasks of gliding angle and approach area. Their Heart Rate Variability (HRV) and NASA-Task Load Index (TLX) were measured to determine their stress level and subjective workload, respectively. In addition, Landing Performance (LP) data (e.g. landing distance, landing speed) and Above Glide Path Tracking Performance (AGPTP) data were also collected to evaluate pilot performance. As a result, the type of approach area showed a significant effect on pilot performance, workload, and stress determined by ANOVA (HRV, TLX, LP, AGPTP: all are p < .05). Flying over "Populated" area (e.g. a large city) resulted in lower pilot performance and higher pilot workload and stress than that over "Non-Populated" area (e.g. a grass field). Similarly, the levels of a gliding angle showed the statistical difference on the performance, workload, and stress (HRV, TLX, and LP: all are p < .05). During the flight with 4.5 degree, the pilots showed lower performance with higher workload and stress. However, the levels of the flight experience did not have any influence on the performance, workload, and stress levels (AGPTP, LP, TLX, HRV: all are p > .05). In conclusion, flying in Populated area and flying with a 4.5 degree gliding angle increases the workload and stress level of the pilots. In addition, when the pilots were flying over Populated area at Final Approach to L/D phase, they showed lower performance on tracking the glide path. Based on the results, stresses and workload can have a significant impact on flight performance. Therefore, in order to reduce the workload and stress that can cause human errors, it is highly recommended to carefully examine the impact of new flight procedures on pilot workload and stress before they are implemented.

Submitted in partial compliance with the requirements for the Master’s Degree in Technology: Chiropractic, Durban University of Technology, 2014. / Background Occupational low back pain (LBP) has been described as a significant burden to society. Although there is uncertainty and conflicting studies on the exact causes and combination of causes of LBP, it has been found that occupations which require prolonged sitting periods and have exposure to physical factors such as whole body vibration (WBV) and / or awkward posture, results in increased likelihood for LBP. Pilots are not sheltered from the development of LBP, with the lifetime prevalence of LBP varying from 31.5% to a significant 82%. Additionally, point prevalence varies significantly between 5.1% and 68%, which illustrates that individual pilot and / or occupational factors may contribute to specific pilot subgroups. This could apply to commercial pilots, who use seats that were found to be ineffective in terms of their depth and inclination, therefore limiting the height and impact of the lumbar support. There is a paucity of studies performed on LBP relating to commercial pilots, specifically, on their unique occupational setting. Research is therefore warranted to illustrate the possible risk factors to which they are exposed to, as impeded performance may lead to catastrophic consequences if a pilot’s ability to complete actions critical to flight becomes hindered. Aim To determine the prevalence of low back pain (LBP) in commercial pilots and identify possible risk factors that pilots are exposed to. Study designs The study transpired as a cross sectional questionnaire survey. Participants Study comprised of 100 commercial pilots registered with the South African Civil Aviation Authority (SACAA) and affiliated with the various participating companies utilizing O.R. Tambo International Airport. Methodology All commercial pilots registered with the SACAA and who make use of the O.R.Tambo International Airport (operate through or from) and affiliated with the participating companies during the research study, was approached for participation. Pilots were required to sign and agree to the letter of information and informed consent, as well as the confidentiality agreement. Questionnaires were distributed and all documents were collected, following completion thereof. Pilots were not allocated to more than one group during the data collection (recording) phase of the study. Subgroup analysis was however not excluded in the analysis. IBM SPSS version 21 was used for analysis. A p value <0.05 was considered as statistically significant. Demographics of the pilots were described in the same manner as in the case of categorical variables, and using summary statistics such as mean, standard deviation and range for quantitative variables. Prevalence and characteristics of the low back pain is described using relative frequency and percentages, with 95% confidence intervals. Associations between risk factors and low back pain was identified with log linear regression analysis and tested using Pearson’s chi square test in the case of categorical variables and t-tests in the case of continuous variables. Results The lifetime prevalence of LBP amongst commercial pilots was 80.8%, with the annual prevalence reaching 68.7%. Majority of commercial pilots were white, married males, with nearly the entire population having reached similar educational levels. Considering the male predominance of this population, gender was significantly associated with LBP. Although the female population was much smaller than the male population, it was also found that females were six times more at risk of developing LBP; however the risk was not statistically significant. Awkward posture such as twisting and being stressed at work were found to be significantly related to LBP. Having a history as an ex-smoker or non-smoker was found to be a risk for LBP development. BMI was also significantly related to LBP; however, an inverse relationship is indicated. Having a subjective rating of good health versus excellent health was also an indicator of risk for LBP. Conclusion: Commercial pilots have a significant risk for LBP development. It was found that subjective ratings of own health was a good indicator of LBP whereby good health versus excellent health, was a significant risk factor. Although greater portions of the populace are white males, normally less at risk, a significant lifetime and annual prevalence of LBP was found. Furthermore, the small female population had potentially considerable contribution to the prevalence of LBP through their significant odds ratio. Being a current smoker carried less risk in comparison to a history of an ex-smoker or non-smoker, which further complicates the so often debated contribution of this proposed risk factor. Interesting results were found through the inverse proportional relationship that exists between BMI and LBP, whereby every unit increase in BMI results in a relative decreased risk for LBP development. Majority of the proposed risk factors of LBP was not found to be significant, except stress and twisting, which were found to be common risk factors amongst commercial pilots.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND AERONAUTICS. / Bibliography: leaves 129-132. / by Albert Thomas Stephens. / M.S.

Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. / Includes bibliographical references. / by Arye R. Ephrath. / Ph.D.

The focus of this thesis is fatigue in aviation. It presents a detailed analysis of subjective fatigue and sleep patterns in short-haul operations. This operation was chosen because short-haul rosters encompass a range of scheduling factors that have been identified in the shiftwork literature as having a negative impact on alertness and performance. It is contended that studies examining these factors in the commercial aviation industry are scarce, and of those available, limited to investigations conducted outside of Australia. In addition, this thesis addresses a methodological limitation that has, to date, restricted the ability to measure fatigue during flight. It is contended that the scarcity of in-flight studies stems from the lack of a suitable performance test for measuring fatigue in time-constrained operating environments, such as aviation. The studies presented in this thesis are divided into two sections. The first section comprises three aviation studies conducted in Qantas airlines. The first two aviation studies examined the effects of scheduling factors on the subjective fatigue of flight crew employed by Qantas airlines. Two different populations were examined: B767 and B737 flight crew. Participants rated their fatigue and recorded information about their flying patterns for a minimum of 15 days. The results indicated that flight crew experienced mild to moderate fatigue in relation to their work. Importantly, different scheduling factors contributed to fatigue, including length of the flight duty period, number of flying hours, and duty start times. The third aviation study examined the sleep of B737 flight crew across a 3-day schedule. Sleep quantity and quality were determined from a sleep diary and wrist actigraphy data. The results indicated that sleep offset time, sleep duration, and sleep quality significantly varied across the schedule. In addition, early morning start times and late evening end times were key factors contributing to reduced sleep. The second section of this thesis comprises two laboratory studies that assessed the sensitivity of a brief (i.e. less than 10 minutes) psychomotor vigilance task (PVT) to the effects of sleep loss. A preliminary study compared performance during the 10-minute PVT with performance during the first half of the PVT during a night of wakefulness (23:00 ? 07:00 hours). A subsequent study compared performance during a 10-minute PVT with performance during a 90-second PVT and a 5-minute PVT during 28 hours of sustained wakefulness. The findings of the latter study indicated that performance during the 5-minute PVT and the 90-second PVT deteriorated in a manner similar to that observed during the standard 10-minute PVT. However, in line with the findings reported in the preliminary study, the shorter the task sampling time, the less sensitive the test to response slowing and performance variability. Based on these findings, it was surmised that a 5-minute PVT is likely to provide a more accurate measure of performance impairment than a test of shorter duration. Moreover, it was proposed that a 5-minute PVT may provide researchers with a reliable test for assessing changes in performance. In summary, the results of the aviation studies indicate that a number of scheduling factors contribute to fatigue and disturbed sleep in Australian domestic operations. The findings of this thesis are of particular concern, given that current aviation regulations do not fully consider the extent to which scheduling demands affect flight crew. It is apparent that flight crew would benefit from the incorporation of such findings into duty and rest limitations and scheduling procedures. Evidence demonstrating that (1) fatigue accumulates across the flight duty period, and (2) flight crew are at particular risk of higher fatigue when they are rostered to work an early morning duty suggests that the length of the flight duty period, the number of sectors worked and the timing of the duty period warrant particular attention. Finally, the results of the laboratory studies hold particular promise for future research, since they suggest that the 5-minute PVT may provide researchers with an alternative tool for investigating fatigue in the flying environment. / thesis (PhD)--University of South Australia, 2004.