TSB fatigue-related findings, 1990–2018

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The Transportation Safety Board of Canada (TSB) has identified fatigue as a causal or contributing factor or a source of risk in 93 investigations conducted up until October 2018. These investigations have included 31 occurrences in the railway industry, 28 in the marine sector, and 34 in aviation.

 Table 1. Rail investigation reports
Report Occurrence Date Location Finding
R16W0242 Uncontrolled movement, collision and derailment, CP 2016-11-29 Saskatchewan Finding as to risk—If train crew members remain on duty after an extended period of wakefulness, there is a risk that the performance of cognitive task could be adversely affected.
R16T0162 Main-track train collision and derailment, CP 2016-08-21 Ontario Finding—Although both crew members carried a sleep debt and the train was being operated during a period of low circadian rhythm, it could not be determined whether fatigue affected the crew members' performance relating to signal recognition.
R16D0076 Crossing collision, CN 2016-08-18 Quebec Alertness during the night shift—A factor that could have increased the risk of fatigue at the time of the accident was the period of work from 0000 to 0600.
R16E0051 Main-track train collision, CN 2016-06-04 Alberta Finding as to risk—If call times for train crew schedules cannot be reliably predicted, operating crew members may not be able to achieve sufficient restorative sleep, which can lead to accumulated sleep debts, increasing the risk of fatigue.
R16H0024 Collision between train and track unit, CP 2016-03-06 Ontario Finding as to cause—At the time the decision was made to depart Kinogama Siding, the foreman's level of fatigue and its negative impact on performance had been influenced by a number of interacting factors, likely including the combined effects of 2 sleep disorders (which were each considered mild), the time of day during a circadian trough, and a demanding work schedule.
Finding as to risk—If maintenance-of-way employees who carry out safety-critical tasks are not subject to enhanced medical requirements, underlying medical conditions, including sleep disorders that affect the safety performance of employees, can go undetected, increasing the risk of accidents.
R16C0012 Non-main-track derailment, CP 2016-02-18 Alberta Finding as to cause—The locomotive engineer's working memory and vigilance were likely limited due to fatigue, contributing to the improper train handling.
Findings as to risk
  • If operating employees do not use the rest opportunities provided, there is a risk that trains may be operated by fatigued employees, increasing the risk of accidents.
  • If operating employees do not remove themselves from work when they are not adequately rested, trains may be operated by fatigues employees, increasing the risk of fatigue-related accidents.
  • If railway industry fatigue management procedures do not provide opportunities for potentially fatigued employees to remove themselves from eligibility for duty without fear of discipline, there is an increased risk that fatigues employees will report for duty.
  • If internal company investigations into situations where human performance may have played a role do not collect and analyze data related to employee sleep history, issues contributing to employee fatigue may go undetected and unmitigated, increasing the risk of fatigue-related accidents.
R15V0046 Movement exceeds limits of authority, CP 2015-03-11 British Columbia Finding as to risk—During periods of reduced alertness (such as low circadian rhythm), there is an increased risk of inadvertent errors, such as the misrepresentation of communications with other railway employees.
R15V0003 Main-track derailment, CP 2015-01-13 British Columbia Finding as to risk—If fatigue management principles and best practices are not considered or permitted by company policy, and are not used by all employees involved in operating or routing trains, including personnel at the Rail Traffic Control Centre, employees can be in a fatigued state when making critical safety decisions, increasing the risk of non-optimal decisions leading to accidents.
R14V0215 Main-track derailment, CN 2014-11-15 British Columbia Finding as to cause—The crew members were fatigued at the time of the occurrence, as they had been experiencing circadian rhythm disruptions in the days prior. This state of fatigue probably affected their ability to recognize the significance of the wheel slip alarm and the earlier than expected HBD/HWD/DED announcement.
Finding as to risk—If shift start times are highly variable, train crew members may not be able to obtain good-quality sleep on a regular basis, resulting in fatigue during duty shifts, and increasing the risk of accidents.
R14W0256 Main-track derailment, CN 2014-10-07 Saskatchewan Finding as to cause—It is likely that the assistant vice-president, Safety and Emergency Response, and the senior dangerous goods officer experienced fatigue due both to prolonged wakefulness and circadian rhythm disruption, which led to decreased vigilance regarding the risks associated with the flaring of tank car PROX 126.
R12V0008 Collision between train and track unit, CN 2012-01-14 British Columbia Finding as to cause—The foreman's diminished state of alertness and his focus on the south portion of the right-of-way likely contributed to the formulation of an erroneous mental model, resulting in him taking the south track.
R11D0075 Main-track derailment, CN 2011-09-24 Quebec Finding as to risk—Crews that work variable, unpredictable schedules are exposed to an increased risk of diminished alertness associated with the desynchronization of their circadian rhythms.
R11E0063 Collision with tail-end of stationary unit on main-track, CN 2011-06-23 Alberta Finding as to cause—The cognitive processes of the experienced and qualified train crew members were likely impeded by reduced alertness, leading to the inappropriate train control.
Other finding—Despite the availability of the Work/Rest Rules, work scheduling practices for train crews continue to be a challenge for employers and employees in the railway industry.
R10T0213 Main-track derailment, CN 2010-10-01 Ontario Finding as to cause—The locomotive engineer was insufficiently rested to be engaged in safety-critical tasks. His fatigued state was compounded by the challenge of operating an unfamiliar train during an unplanned braking event in undulating territory with a number of curves.
Finding as to risk—Given that it is left to employees to determine whether they are fit to work, when faced with loss of wage and/or potential company discipline, there is an increased risk that a fatigued employee will accept work, compromising safe train operation.
R10Q0037 Main-track derailment, CN 2010-08-23 Quebec Finding as to risk—Certain factors (e.g., concurrent tasks, darkness, reduced vigilance), whether alone or in combination, can reduce the inspector's ability to perform his work.
R10E0096 Switching assignment colliding with stationary cut of cars, CN 2010-08-18 Saskatchewan Finding as to cause—A reduced level of alertness contributed to the foreman's actions, including his decision to bypass the requirement for visual point protection of the movement and his actions leading to misrouting assignment 602 into track VC-64.
R10Q0011 Main-track derailment, VIA Rail 2010-02-25 Quebec Finding as to cause—The crew's planning and reaction to more complex issues was likely degraded due to fatigue.
R09W0259 Non-main-track collision with stationary train, CP 2009-12-19 Saskatchewan Finding as to risk—Operating crews that work variable and unpredictable work schedules may be at increased risk of performance impairments due to fatigue.
R07E0129 Non-main-track collision with side of train entering siding, CN 2007-10-27 Alberta Finding as to cause—Train 417's crew was insufficiently rested to be engaged in safety-critical tasks.
Finding as to risk—From time to time, fatigued train crews will feel compelled to report for work without adequate rest, creating the risk of an accident.
Other finding—Despite previously-acquired knowledge on fatigue, the countermeasures the railway had in place were ineffective.
R07V0213 Non-main-track collision involving a Beltpack assignment and train, CN 2007-08-04 British Columbia Finding as to risk—While both regulatory and company Work/Rest Rules address fatigue in the short term, regulatory requirements give inadequate consideration to the cumulative effects of working extended hours over the longer term because there are no specific limitations placed upon any employee who exceeds 64 hours of work in seven days.
R06W0079 Main-track derailment, CP 2006-05-22 Saskatchewan Finding as to risk—The interpretation of the Work/Rest Rules for Railway Operating Employees that allows a trip, which routinely exceeds 12 hours, to be planned as two tours of duty creates a situation in which crews may routinely exceed the 12-hour maximum tour of duty and work up to 18 hours with little or no rest break. This increases the risk that crew performance will be adversely affected by fatigue.
R05C0082 Main-track derailment, CP 2005-05-27 Alberta Finding as to cause—It is possible that fatigue played a role in the train handling errors, that is, the rapid changes in throttle and dynamic brake that were made in this instance.
Finding as to risk—The regulatory and industry framework for the management of risks related to fatigue may not adequately protect against the effects of fatigue that result from the work/rest cycle of train crews.
R03W0169 Main-track derailment, CP 2003-10-19 Ontario Findings as to risk
  • The Work/Rest Rules for Rail Operating Employees permit consecutive hours of wakefulness in excess of 18 hours with no scheduled rest, which increases the risk of fatigue-related errors and accidents.
  • The nature of rail operations requires crew members to work variable, unpredictable schedules, often for their entire working lives. Unpredictable schedules increase the probability that train crews will be working in a chronically fatigued state, which can lead to errors associated with fatigue.
R99E0023 Runaway, collision and derailment, CN 1999-01-31 Alberta Finding as to risk—The rest/work cycle and sleep pattern of the crew, especially the conductor, were conducive to fatigue and a consequent risk of performance impairment.
R98V0183 Main-track collision, CN 1998-10-01 British Columbia Findings as to cause
  • It is quite possible that both crew members of train 792 experienced a microsleep as they approached and passed the CTC signal at Mile 59.2 governing the entrance to Basque.
  • The crew fatigue issue is even more pronounced on the second subdivision of extended runs as the distance travelled and time working during one tour of duty is typically doubled.
  • The current regulatory requirements respecting mandatory time off-duty and maximum hours of service can result in train crews being in compliance with regulatory requirements but not being sufficiently rested.
  • Loss of income from missing a trip will motivate an employee to report for duty with insufficient rest.
R97C0147 Runaway and derailment, CP 1997-12-02 British Columbia Finding—The performance of the locomotive engineer may have been affected by fatigue which would have impaired his ability to make critical operating decisions.
R96W0171 Collision with head-end of stationary train and derailment, CN 1996-07-02 Saskatchewan Findings
  • While fatigue is not considered to have played a direct role in the switch being left in the reverse position or the operation of train 358 in a more cautious manner, the crew's tour of duty made them vulnerable to sleep need performance degradation.
  • Mandatory rest requirements do not account for time awake before duty nor short turn-around scheduling schemes.

Safety concern—The Board believes that implementation of initiatives such as CANALERT, coupled with a comprehensive hours of service rule, is necessary to alleviate the problem of fatigue in the railway operating environment. The Board is concerned that, although certain elements of CANALERT have been implemented, there has not been widespread application of the CANALERT concepts.

R96Q0050 Collision with rear of stationary train, Quebec North Shore and Labrador Railway 1996-07-14 Quebec Finding—The possibility that fatigue may have contributed to the locomotive engineer's decision not to comply with the governing signal indication cannot be ignored.
R95V0218 Collision between 2 trains, CP 1995-10-01 British Columbia Finding—Both crew members of train 819 were impaired by fatigue as they approached the Stop Signal at Greely and operated their train past the signal and into train 996.
R95S0021 Collision with rear of stationary train, CN 1995-02-16 Ontario Finding—It is probable that the locomotive engineer of train 272 succumbed to fatigue and experienced a sleep episode as his train was approaching Signal 44.
R94T0334 Collision with rear of stationary train, CN 1994-10-28 Ontario Finding—Reduced alertness from disruption of the normal sleep cycle probably was a contributing factor in the inappropriately high speed just before the collision.
 Table 2. Marine investigation reports
Report Occurrence Date Location Finding
M16P0378 Grounding and sinking of articulated tug-barge Nathan E. Stewart and tank barge DBL 55 2016-10-13 British Columbia Finding as to cause—The second mate, who was working alone on the bridge, was fatigued and fell asleep. As a result, he did not make the planned course alteration, and the articulated tug-barge struck and grounded on a reef.
Finding as to risk—If a 6-on, 6-off shift schedule is used without fatigue-mitigating measures, there is a risk that crew members will carry out their duties while impaired by fatigue.
M15C0006 Grounding of self-discharging bulk carrier Atlantic Erie 2015-01-11 Quebec Finding as to risk—If mariners, including the master, exceeded the regulated hours of work and are not properly rested, there is a risk of fatigue-related accidents.
M14C0219 Bottom contact of tanker Nanny 2014-10-14 Nunavut Findings as to cause
  • At the time of the occurrence, both the master and the helmsman had been subject to significant fatigue risk factors and exhibited performance decrements consistent with fatigue.
  • Ineffective fatigue management on board the vessel contributed to the master and helmsman being fatigued while on duty.

Finding as to risk—If marine regulations do not require companies to develop comprehensive fatigue management plans, performance decrements may occur in those who occupy safety-critical positions, increasing the risk of incidents and accidents.

M12L0147 Grounding of bulk carrier Tundra 2012-11-28 Quebec Finding as to cause—Fatigue was a likely factor in the pilot's diminished situational awareness at a critical time when a course change was required.
Finding as to risk—Without training in fatigue awareness, there is a risk pilots may not be able to identify symptoms or signs related to sleep disorders, which are not detectable through a regular medical exam.
M12F0011 Collision between fishing vessels Viking Storm and Maverick 2012-09-28 United States Finding as to cause—It is highly likely that the cognitive abilities of the mate on the Viking Storm were reduced due to fatigue resulting from a combination of acute sleep loss, continuous wakefulness, and circadian rhythm timing.
Findings as to risk
  • If fishermen equate resting with sleeping in terms of its restorative capacity, there is a risk that they may underestimate the continuous hours of sleep necessary to restore their cognitive functions.
  • Minimum safe manning requirements that do not consider the various aspects of fishing operations may result in crew members not being provided opportunities to achieve the required hours of rest.
  • Without a fatigue management plan that considers fishing operations and the need to ensure uninterrupted sleep, crew members may not be sufficiently rested to safely perform their duties.
M12N0017 Striking of wharf by Passenger vessel Beaumont Hamel 2012-05-30 Newfoundland and Labrador Finding as to risk—Fatigue-management plans that do not provide sufficient opportunity for restorative sleep increase the risk of reduced crew performance on a routine basis.
M11W0091 Striking of bridge by tug F.W. Wright and barge Empire 40 2011-06-28 British Columbia Findings as to cause
  • The master had been awake for approximately 22 hours and was likely experiencing feelings of fatigue when he handed over the control to the mate prior to a critical stage in the passage.
  • The master did not take advantage of the opportunity to rest and sleep after the mate joined the tug and fell asleep at a critical stage in the passage.
M09W0064 Collision between fishing research vessel Velero IV and fishing vessel Silver Challenger II 2009-04-08 British Columbia Finding as to risk—Work/rest schedules that do not provide for sufficient restorative sleep are likely to lead to fatigue, performance degradation, and errors due to lack of attention, alertness, and vigilance.
M08C0024 Grounding of bulk carrier Algomarine 2008-05-28 Ontario Finding as to cause—Lack of sleep contributed to the master's fatigue, which in turn likely affected his performance. Sleep disturbance could have been exacerbated by the negative side effects of quitting smoking and the use of a prescription drug.
M07L0158 Striking of passenger vessel Nordik Express 2007-08-16 Quebec Finding as to risk—In the absence of a fatigue management plan, the probability of fatigue-induced errors increases, thereby increasing the risk to vessels, crew, passengers, and the environment.
M06F0024 Crew member of sail training vessel Picton Castle lost overboard 2006-12-08 Nova Scotia Finding as to cause—The deckhand was likely affected by fatigue and a loss of alertness at the time of the occurrence.
M06N0014 Fire in cargo oil tank of shuttle tanker Kometik 2006-04-08 Newfoundland and Labrador Finding as to cause—A crew member with a high workload of safety-sensitive duties worked while in a fatigued state, leading to insufficient oversight of the welding activities.
Finding as to risk—The vessel's shipboard safety manual did not identify fatigue or workload as risk factors and did not incorporate procedures to mitigate them.
M06W0052 Striking and sinking of passenger and vehicle ferry Queen of the North 2006-03-22 British Columbia Finding—The change from sleeping during the night to sleeping during the day, together with the restless sleep, likely increased the risk of QM1 being fatigued.
M05C0063 Grounding of bulk carrier Michipicoten 2005-10-28 Ontario Finding as to cause—The master's work/rest schedule at the time of the occurrence did not adhere to well established regulatory requirements.
Finding as to risk—The regulatory requirements to help ensure masters and officers have enough rest were not incorporated in the company's written procedures.
Other finding—The master's schedule may have predisposed him to fatigue-related performance issues.
M04L0099 Collision between pleasure craft Mondisy and container ship Canada Senator 2004-08-11 Quebec Finding as to cause—It is likely that the unstructured watchkeeping system aboard the Mondisy led to a sleep debt that caused the co-worker to fall asleep while on duty at the helm.
M04L0092 Grounding of container ship Horizon 2004-07-24 Quebec Finding as to cause—Fatigue may have been a factor in the pilot's decreased vigilance at a critical time.
Finding as to risk—Despite fatigue awareness training and contractual arrangements that set out adequate rest for pilots, fatigue continues to be a factor in occurrences.
M04L0092 Container ship Horizon 2004-07-24 Quebec Finding as to cause—Fatigue may have been a factor in the pilot's decreased vigilance at a critical time.
Finding as to risk—Despite fatigue awareness training and contractual arrangements that set out adequate rest for pilots, fatigue continues to be a factor in occurrences.
M02L0061 Bulk carrier Kent 2002-07-16 Quebec Finding as to risk—In the 24 hours preceding the accident, the bosun only had four hours off duty, and his judgment, reaction time, and alertness would have been adversely affected by fatigue.
M02C0011 Tug-barge unit Progress/Pitts Carillon 2002-04-21 Ontario Finding as to cause—The adopted work-rest schedule for the crew was not conducive to acquiring proper rest, and the crew's performance was likely affected by fatigue at the time of the occurrence.
M97W0197 Grounding of bulk carrier Raven Arrow 1997-09-24 British Columbia Finding as to cause—The pilot did not fully appreciate the negative effects that an irregular work schedule and sleep debt can have on performance. The pilot was probably fatigued and there was no formalized education/training program in place regarding conditions conducive to fatigue and the impact of scheduling on fatigue.
M96C0032 Dangerous Occurrence
Passenger ferry Wolfe Islander III
1996-05-29 Ontario Finding—It is likely that master was suffering from fatigue, which may have adversely affected his judgement and performance.
M94W0066 Collision Fishing vessels Narvik and Island Joy 1994-08-21 British Columbia Finding—The skipper/owner of the Island Joy fell asleep while alone on watch.
M94W0057 Fall overboard Bulk carrier Pacific Brilliance 1994-07-27 British Columbia Finding—The shipyard personnel, including the victim, had been working for over 17 hours and they used an unsafe gangway to disembark from the vessel.
M94M0036 Collision Fishing vessel Lady Olive Marie, racing sailboat Coyote 1994-08-24 Nova Scotia Finding—Due to fatigue, a proper lookout onboard the Coyote was not being maintained as required by the International Regulations for Preventing Collisions at Sea.
M93M0008 Small lobster vessel Stump Jumper 1993-11-30 Nova Scotia Finding—The operator's performance was probably impaired by the cumulative effects of his diabetic condition and work-induced fatigue.
M93L0001 Bulk carrier Canadian Explorer 1993-04-16 Quebec
  • Findings
  • The pilot had had over two days of rest period since his last assignment, but was tired at the start of this assignment.
  • The pilot's behaviour pattern and sleep discipline during rest periods were not conducive to maximizing his performance.
  • The pilot had had the conduct of the vessel for some three and a half hours and was asleep at the time of bottom contact.
M93COOO3 Striking Bulk carrier Nirja and tanker Hamilton Energy 1993-12-11 Ontario Finding—The pilot had been on duty for some 22 hours without restorative sleep and this probably adversely affected his performance.
Board concerns
  • Pilotage assignment practices permitted extended duty days, which could lead to significant performance degradation.
  • The Great Lakes Pilotage Authority and the pilots themselves apparently did not fully appreciate the negative effects of fatigue on performance and the strategies for mitigating those effects.
M92W1066 Collision Bulk carrier Nand Anant and fishing vessel Carmanah No. 1 1992-08-29 British Columbia Findings
  • There are no regulations governing hours of work/rest on board fishing vessels.
  • Ineffective planning of the work/rest hours resulted in less vigilant, tired personnel being on watch.
 Table 3. Aviation investigation reports
Report Occurrence Date Location Finding
A17Q0050 Collision with wires, Exact Air 2017-04-30 Quebec Finding as to cause—Sensation seeking, mental fatigue, and an altered risk perception very likely contributed to the fact that, immediately after completing the magnetometric survey work, the pilot flying descended to an altitude varying between 100 and 40 feet above ground level and maintained this altitude until the aircraft collided with the wires.
A16P0180 Loss of control and collision with terrain, privately operated Beaver aircraft 2016-10-10 British Columbia Finding as to risk—If pilots do not obtain quality sleep during the rest period prior to flying, there is a risk that they will operate an aircraft while fatigued, which could degrade pilot performance.
A16O0016 Runway incursion and risk of collision, Air Canada 2016-01-30 Ontario Finding as to risk—If required commuting flights are not included as part of the pilot's duty day, there is an increased risk of pilots operating while fatigued due to prolonged periods of wakefulness.
A16A0084 Collision with wires, privately operated helicopter 2016-09-04 New Brunswick Finding as to risk—If pilots do not take advantage of opportunities to sleep between duty periods, there
is an increased risk of degraded performance due to fatigue.
A15O0031 In-flight breakup, privately operated Piper aircraft 2015-03-17 Ontario Finding as to cause—Given the pilot's expired qualifications, lack of recent experience, and levels of chronic stress and fatigue, he was neither qualified nor fit to undertake the flight on the day of the occurrence.
A15H0002 Collision with terrain, Air Canada 2015-03-29 Nova Scotia Finding as to risk—If Transport Canada does not consistently follow its protocol for the assessment of aeromedical risk and ongoing surveillance in applicants who suffer from obstructive sleep apnea, some of the safety benefit of medical examinations will be lost, increasing the risk that pilots will fly with a medical condition that poses a risk to safety.
Other finding—Given that the captain rarely used continuous positive airway pressure therapy, he would have been at risk of experiencing fatigue related to chronic sleep disruption caused by obstructive sleep apnea. However, there was no indication that fatigue played a causal or contributory role in this occurrence.
A13H0001 Controlled flight into terrain, Ornge medevac helicopter 2013-05-31 Ontario Finding as to risk—If pilots engage in other work-related activities before the commencement of scheduled flight duty time, there is a risk that regulatory flight duty time limitations will be exceeded, which may degrade performance due to fatigue.
A13C0105 Loss of control – collision with water, Transwest Air Limited Partnership 2013-08-22 Northwest Territories Finding as to cause—Cumulative unmanaged stressors disrupted the pilot's processing of safety-critical information, and likely contributed to an unsafe decision to depart with a damaged, uninspected aircraft. Specifically, the pilot's fatigue, in combination with illness, anger, heavy workload, time pressure, and the tree strike, reduced the resources available to gather and systematically process safety-critical information, resulting in a decision to depart with a damaged, uninspected aircraft.
A12W0004 Runway overrun, Enerjet 2012-01-09 British Columbia Findings as to cause
  • The captain did not attain appreciable sleep in the 24 hours preceding the flight and was fatigued, likely resulting in attention decrements.
  • The captain continued the approach when the aircraft was not in a stabilized configuration, consistent with fatigue-induced reduction in forward planning and a focus of attention towards salvaging the flight.
  • On short final the captain pitched the aircraft nose down in an attempt to capture the glideslope which was below their flight path. The nose down attitude increased the airspeed resulting in a longer flare and a touchdown beyond the recommended 1000 feet mark, thus reducing the amount of available runway for stopping.
  • The autothrottle system was not disengaged below 50 feet, which resulted in the A/T system increasing thrust in order to maintain the selected airspeed. This increase in thrust delayed the deployment of the speed brakes and thrust reversers, which left insufficient runway in which to stop.

Findings as to risk

  • If flight crews are not given training on fatigue and fatigue countermeasures, they risk not having the tools they need to deal with fatigue.
  • If flight crew are required to assess their own level of fatigue and the effects it will have on their performance, they may not identify unacceptable levels of fatigue.
A12Q0216 Low-energy rejected landing and collision with terrain, Perimeter Aviation 2012-12-22 Nunavut Finding as to cause—Frustration, fatigue, and an increase in workload and stress during the instrument approaches resulted in crew attentional narrowing and a shift away from well-learned, highly practised procedures.
A11F0012 Pitch excursion, Air Canada 2011-01-14 North Atlantic Ocean Findings as to cause
  • The interrupted sleep obtained by the first officer prior to the flight increased the likelihood that rest would be needed during the overnight eastbound flight.
  • The first officer slept for approximately 75 minutes which likely placed the first officer into slow-wave sleep and induced longer and more severe sleep inertia.
  • The first officer was experiencing a circadian low due to the time of day and fatigue due to interrupted sleep which increased the propensity for sleep and subsequently worsened the sleep inertia.
  • By identifying the oncoming aircraft, the captain engaged the first officer (FO) before the effects of sleep inertia had worn off.
  • Under the effects of sleep inertia, the first officer perceived the oncoming aircraft to be on a collision course and pushed forward on the control column.
  • The frequency of training and depth of the training material on fatigue risk management to which the flight crew were exposed were such that the risks associated with fatigue were not adequately understood and procedures for conducting controlled rest were not followed by the flight crew.

Finding as to risk—North American-based pilots flying eastbound at night towards Europe are at increased risk of fatigue-related performance decrements.

A10H0004 Runway overrun, Trans States Airlines LLC 2010-06-16 Ontario Finding as to risk—Fatigue creates a risk of performance decrements in aircraft operations, and work-rest rules did not necessarily prevent flight crews from being fatigued.
A09Q0003 Controlled flight into trees, privately operated Piper Cherokee 2009-01-06 Quebec Finding as to risk—The pilot undertook an extended night flight at the end of the day, with a planned return flight the same day. As a result, the pilot ran the risk of fatigue that may have led to degradation of performance.
A08O0233 Uncontrolled descent into terrain, privately operated Cessna 2008-09-01 Ontario Findings as to cause
  • Due to fatigue, the pilot involuntarily fell asleep resulting in the aeroplane continuing to fly in its trimmed condition until it struck the ground.
  • The two passengers, both with flying experience, were asleep and did not identify the developing situation and, therefore, could not alert the pilot.

Finding as to risk—Reliance on a pilot's own judgment to prevent fatigue-related accidents is an ineffective defence mechanism.

A08C0164 Airspeed decay – Uncommanded descent, Air Canada Jazz 2008-08-01 Manitoba Finding as to risk—Although it is unlikely that the crew were fatigued at the time of the occurrence, the captain's work schedule resulted in irregular sleep patterns that had the potential to increase the risk of fatigue and fatigue-related performance decrements.
A07O0305 Runway incursion, R & M Aviation Inc. 2007-11-15 Ontario Finding as to risk—A crew's alertness may be reduced by operational pressures and fatigue associated with a long duty day and multi-leg scheduling.
A07O0273 Collision with trees on approach, Ukrainian Cargo Airways 2007-10-04 Ontario Finding as to risk—On several occasions prior to the occurrence flight, the crew did not receive the 42-hour rest period required by Ukrainian Cargo Airways' procedures after completing trans-meridian flights, potentially increasing the risk of operating while fatigued.
A05W0109 Inadvertent stick shaker at high altitude, Air Canada Jazz 2005-06-10 Alberta Finding as to cause—The captain was not well rested before the flight. The effects of fatigue likely resulted in a degradation of his concentration and prolonged diversion of attention from monitoring of airspeed after power reduction. The airspeed was therefore allowed to fall below the targeted value.
A04W0032 Landing beside the runway, Bradley Air Services Ltd. (First Air) 2004-02-25 Alberta Finding as to risk—Neither the Canadian Aviation Regulations nor the First Air Operations Manual provides sufficient defences concerning the scheduling of crew duty periods so that extended periods of wakefulness, lack of restorative sleep and rapid changes in crew shift times do not unduly affect crew performance.
A04H0004 Reduced power at take-off and collision with terrain
MK Airlines Limited
2004-10-14 Nova Scotia Findings as to cause
  • Crew fatigue likely increased the probability of error during calculation of the take off performance data, and degraded the flight crew's ability to detect this error.
  • Crew fatigue, combined with the dark take-off environment, likely contributed to a loss of situational awareness during the take-off roll. Consequently, the crew did not recognize the inadequate take-off performance until the aircraft was beyond the point where the take-off could be safely conducted or safely abandoned.
A04H0001 Loss of control, Georgian Express Ltd. 2004-01-17 Ontario Finding as to cause—On this flight, the pilot's lack of appreciation for the known hazards associated with the overweight condition of the aircraft, ice contamination, and the weather conditions was inconsistent with his previous practices. His decision to take off was likely adversely affected by some combination of stress and fatigue.     
A01O0210 Controlled flight into terrain, privately operated Cessna 2001-08-03 Ontario Finding as to cause—It is likely that fatigue affected the pilot's performance, and may have contributed to the accident.
A00W0217 Collision with terrain, Summit Air Charters Ltd. 2000-10-08 Northwest Territories Finding as to risk—Given the pilot's flying time during the 30 days before the accident, the pilot's performance might have been affected by fatigue.
A99W0043 Wing strike on landing, Delta Air Lines 1999-03-10 Alberta Finding as to risk—The captain and the second officer were subjected to a long work day because, in addition to the duty day required to operate the flights, they had commuted to their base of operation by air early on the morning of the flight. Long work days may contribute to fatigue.
A99Q0151 Controlled flight into terrain, Régionnair Inc. 1999-08-12 Quebec Findings as to risk
  • Both crew members had surpassed their maximum monthly and quarterly flight times and maximum daily flight duty times. They were thus at increased risk of fatigue, which leads to judgement and performance errors.
  • The first officer likely suffered from chronic fatigue, having worked an average of 14 hours a day for the last 30 days, with only 1 day of rest.
A97Q0183 Wire strike on take-off, privately operated Piper Aztec 1997-08-22 Quebec Finding as to cause—The pilot was fatigued, because he did not take enough rest in preparation for the flight.
A97P0207 Collision with terrain, Northern Mountain Helicopters Inc. 1997-07-30 British Columbia Findings as to risk
  • The pilot's work/rest schedule increased the probability of him making fatigue-related errors in both aircraft handling and judgement.
  • According to the company records, the pilot had, on several occasions, exceeded the legislated flight- and duty-time limitations of the CARs.
A95W0093 Weather-related event, Continental Helicopters 1995-06-13 Yukon Territory Finding as to cause—The pilot's flying activities in the period prior to the accident were conducive to fatigue.
A95Q0210 Controlled flight into terrain, privately operated Cessna 1995-10-22 Newfoundland and Labrador Finding as to risk—The pilot had been on duty for a long period, which possibly affected his performance.
A95P0007 Collision with water, privately operated Piper 1995-01-12 British Columbia Finding as to cause—The pilot reportedly had little sleep in the previous 24 hours and may have been fatigued.
A94C0119 Collision with terrain, privately operated Cessna 1994-06-29 Saskatchewan Finding as to cause—The pilot's flying and non-flying duties resulted in long hours of work. As a result, he may have been suffering from fatigue.
A94C0088 Controlled flight into obstacle and terrain, Keewatin Air Limited 1994-06-01 Manitoba Finding as to cause—Pilot fatigue and personal stress likely adversely affected the performance of the pilot flying.
A93W0204 Marine power loss/loss of control, Arctic Wings and Rotors 1993-12-03 Northwest Territories Finding as to risk—While it cannot be determined that fatigue contributed to this accident, the pilot's recent work schedule was conducive to fatigue.
A91H0004 Collision with terrain, Government of Quebec 1991-06-19 Quebec Findings as to risk
  • The crew had been subjected to fatigue-inducing elements during the three days prior to the accident.
  • The Service aérien du Québec does not consider stand-by time held at the airport by water bomber crews as duty time.
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