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1.18.7.2 Captain's Flight and Duty Times
The captain flew 127 hours in the last 30 days and 337 hours in the last 90 days. A monthly or quarterly flight time extension request for the captain could not be found in either his or TC's files. On the day of the accident, he had been on duty, first at his own company and then at Régionnair, for 16 hours. His logbook records indicate that from July 28, he flew every day for one or the other company (and sometimes for both on the same day) except for August 4, 5, and 10. His total flying hours for those 11 days were 73.5 hours, an average of 6.68 hours per day. It could not be determined how much time he spent daily performing administrative or operational tasks at his own company when he was not flying. The captain was required to report his Confortair flying times monthly to the Régionnair operations officer for tracking. His total flying times for both companies, from May 1 to July 21, were on record at Régionnair. Flying times after that date had not been reported.
1.18.7.3 First Officer's Flight and Duty Times
The first officer flew 181 hours in the last 30 days and 368 hours in the last 90 days. Like the captain, a monthly or quarterly flight time extension request for him could not be found in either his or TC's files. On the day of the accident, he had been on duty, first at Confortair and then at Régionnair, for 18 hours. The first officer's logbook indicates that he had been on duty and flew for one or the other company every day since July 14, except for August 1. His total flying times for both companies, from June 6 to July 31, were on record at Régionnair. Total flying times for August had not been reported. Neither the regulator nor Régionnair was aware that both pilots were exceeding their flight and duty time limitations.
1.18.7.4 Pilot Fatigue
Researchers at the Defence and Civil Institute of Environmental Medicine found that after 18 hours awake, people showed a 30% decrement in performance on cognitive and vigilance tasks. After 48 hours, the impairment averaged 60%. Researchers at the Centre for Sleep Research at the University of South Australia found that after 18 hours without sleep, students performed as poorly on performance tests as they had with a blood alcohol concentration of 0.05%. After 24 hours without sleep, their performance decreased to that of a person with a blood alcohol concentration of 0.096%.(5)
As a commuter operation, conducted under Section 704 of the CARs, the company had to provide either 36 consecutive hours free from duty requirements within each 7 consecutive days or 3 consecutive calendar days within each 17 consecutive days. Neither crew member was provided with this time off specified in CAR 700.12(a). Operationally, it is important that recovery periods be scheduled to provide an opportunity to acquire recovery sleep and to re-establish normal levels of performance and alertness. Frequent recovery periods are important. More frequent recovery periods reduce cumulative fatigue more effectively than less frequent ones. For example, weekly recovery periods afford a higher likelihood of relieving acute and cumulative fatigue than monthly recovery periods.(6)
Fatigue can lead to forgetting or ignoring normal checks or procedures and reversion to old habits. Fatigue can also reduce attention, causing one to overlook or misplace sequential task elements, become preoccupied with a single task, and be less vigilant. When alertness is impaired, one may focus on a minor problem (even when there is risk of a major problem), fail to anticipate danger, and display automatic behaviour syndrome. Problem solving can also be affected and may lead to inappropriate actions.
http://www.tsb.gc.ca/ENG/reports/air.../ea99q0151.htm