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The fatigue region extended up to 0.483 inches (12.27 mm) deep through the thickness of the dovetail and was 2.232 inches (5.669 cm) long at the convex surface. Six crack arrest lines (not including the fatigue boundary) were observed within the fatigue region and striations consistent with low-cycle fatigue crack growth were observed.
On September 8, 2023, the NTSB published their final report on the accident. The report revealed that the fatigue failure in the right engine was due to inadequate inspections and insufficient frequency of inspections to catch low-level crack indications. The low-level cracks continued to propagate until their ultimate failure.
It has been estimated that 4-7% of civil aviation incidents and accidents can be attributed to fatigued pilots. [3] "In the last 16 years, fatigue has been associated with 250 fatalities in air carrier accidents." Robert Sumwalt, NTSB vice chairman, said at an FAA symposium in July 2016. [4]
AIA Flight 808 was the first aviation accident where pilot fatigue was cited as a probable cause. [4] The NTSB issued a recommendation to the Federal Aviation Administration to review and update regulations on crew scheduling and duty time limits to incorporate the latest research into the effects of fatigue. [1]
The Federal Aviation Administration sent an inspector to Yuma. The National Transportation Safety Board opened an investigation into the incident. [24] [12] Inspection of the 5 feet (1.5 m) long tear revealed evidence of pre-existing fatigue. The tear was along a lap joint.
The aircraft experienced a loss of control due to a malfunction of the left engine propeller control unit, which was attributed to a design flaw. March 3, 1991 25 1 0 United Airlines Flight 585: Colorado Springs: Colorado: Boeing 737-200: The aircraft experienced a loss of control during approach due to a rudder hardover caused by a design flaw.
When this accident occurred the number of fatalities made it Australia's third worst civil aviation accident, a status it retains to this day. [6] Two civil aviation accidents caused 29 fatalities each – the 1950 Australian National Airways Douglas DC-4 crash and the 1960 Trans Australia Airlines Flight 538 .
The cause of the crash was determined to be loss of control during go around due to lack of coordination between the pilots in a case of engine torque asymmetry, pilot fatigue and poor overisght by the operator. 6 fatalities.