2105 Flashcards
the state in which the possibility of harm to persons or of the property damage is reduced to, and
maintained at or below, an acceptable level through a continuing process of hazard identification and safety risk
management
safety
dynamic characteristic of the aviation system, whereby safety risks must be continuously mitigated
safety
years of the technical era
from the early 1900s until the late 1960s
Aviation emerged as a form of mass transportation in which identified safety deficiencies were initially related to technical factors and technological failures.
technical era
technological improvements led to a gradual decline in the frequency of accidents, and safety processes were broadened to encompass regulatory compliance and oversight.
technical era
years of the human factors era
from the early 1970s until the mid-1990s
the frequency of
aviation accidents was significantly reduced due to major technological advances and enhancements to safety
regulations.
human factors era
years of the organizational era
from the mid-1990s to the present day
from the mid-1990s to the present day
organizational era
Who developed the Swiss-Cheese Model
Professor James Reason
illustrates that accidents involve successive
breaches of multiple system defenses
Swiss-Cheese Model
contends that complex systems such as aviation are extremely well defended by layers of defences, single-point failures are rarely consequential in such systems.
Swiss-Cheese Model
can be a delayed consequence of decisions made at the highest levels of the system, which may remain dormant until their effects or damaging potential are activated by specific operational circumstances
breaches in safety defenses
are actions or inactions, including errors and violations, which have an immediate adverse effect.
active failures
are those that exist in the aviation system well before a damaging outcome is experienced.
latent conditions
have all the potential to breach aviation system defenses
latent conditions
defences in aviation can
be grouped under three large headings:
technology, training, regulations
are largely intuitive in that all those with operational experience have experienced them to varying degrees, and include workforce stability, qualifications and experience, morale, management credibility, and traditional ergonomics factors such as lighting, heating and cooling.
workplace conditions
A simple yet visually powerful conceptual tool for the analysis of the components, the features of operational
contexts and the possible interactions with people is the
SHEL(L) Model
can be used to help visualize the interrelationships among the various components and features of the aviation system
SHEL(L) Model
4 components of SHEL(L) Model
Software, Hardware, Environment, Liveware
procedures, training, support
Software
machine and equipment
Hardware
the working environment in which the rest of the L-H-S system must function
Environment