Aspects of Improvement in Exploitation Process of Passenger Means of Transport

Table 4

Failure mode severity.

Severity	Criteria	Ranking
None	No discernible effect.	1
Very minor	The defect is irrelevant and the user will hardly feel its effects (perceived by less than 25% of users).	2
Minor	The defect is irrelevant and the user will hardly feel its effects (perceived by 50% of users).	3
Very low	A defect of medium importance, causing user dissatisfaction. Seen by the majority of users (about 75%).	4
Low	A defect of medium importance, causing user dissatisfaction. The user feels its effects and is a bit dissatisfied.	5
Moderate	A defect of medium importance, causing user dissatisfaction. The user feels its effects and is dissatisfied.	6
High	A defect of great importance, resulting in reduced system performance. User very dissatisfied.	7
Very high	Inoperative system (loss of the primary function).	8
Hazardous with warning	A defect of very high importance, affecting the safety of use and/or entails failure to comply with government regulations, with warning.	9
Hazardous without warning	A defect of very high importance, affecting the safety of use and/or entails failure to comply with government regulations, without warning.	10