Cause findings

Not a complete record. A partial collection of documented occurrences: counts, not rates, and no measure of aviation risk. Coverage

7,593 of 183,329 records match these filters, leaving out 1,380 unreviewed and minor records. Include them

4,262 occurrences have findings that the NTSB designated as a cause. These are the most common areas of those findings; an occurrence can have causes in several areas. Share is of occurrences with cause findings.

Cause areas
Cause area	Occurrences	Share	Fatal occurrences	Fatalities
Miscellaneous acts, conditions › Material failure	Miscellaneous acts, conditions › Material failure: 210 occurrences, 4.9% of occurrences with cause findings. 13 were fatal. The bar is scaled to the largest row.	4.9%	13	135
Environmental issues › Conditions/weather/phenomena	Environmental issues › Conditions/weather/phenomena: 196 occurrences, 4.6% of occurrences with cause findings. 1 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	4.6%	1	1
Personnel issues › Action/decision	Personnel issues › Action/decision: 189 occurrences, 4.4% of occurrences with cause findings. 3 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	4.4%	3	11
Miscellaneous acts, conditions › Fatigue fracture	Miscellaneous acts, conditions › Fatigue fracture: 132 occurrences, 3.1% of occurrences with cause findings. 15 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	3.1%	15	128
Personnel issues › Task performance	Personnel issues › Task performance: 126 occurrences, 3.0% of occurrences with cause findings. 4 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	3.0%	4	17
Weather › Turbulence, associated w/clouds and/or thunderstorms	Weather › Turbulence, associated w/clouds and/or thunderstorms: 121 occurrences, 2.8% of occurrences with cause findings. 7 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	2.8%	7	238
Pilot in command › Failed to follow approved procedures, directives, etc.	Pilot in command › Failed to follow approved procedures, directives, etc.: 119 occurrences, 2.8% of occurrences with cause findings. 31 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	2.8%	31	1,240
Personnel › Inadequate maintenance and inspection	Personnel › Inadequate maintenance and inspection: 105 occurrences, 2.5% of occurrences with cause findings. 6 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	2.5%	6	37
Aircraft › Aircraft systems	Aircraft › Aircraft systems: 90 occurrences, 2.1% of occurrences with cause findings. 2 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	2.1%	2	4
Personnel › Passenger	Personnel › Passenger: 88 occurrences, 2.1% of occurrences with cause findings. 5 were fatal. The bar is scaled to the largest row (Miscellaneous acts, conditions › Material failure, 210).	2.1%	5	48

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