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Safetycritical

Safety-critical describes systems or components whose failure could result in loss of life, serious injury, or significant environmental or public harm. The term signals that safety considerations are central to the design, implementation, operation, and maintenance of the system. Safety-critical engineering requires explicit safety requirements, hazard analysis, and risk management integrated throughout the system life cycle.

Common domains include aviation (flight control and navigation), rail signaling and control, automotive safety systems (airbags,

Practice in safety-critical engineering typically involves hazard analysis and risk assessment, development of a safety case,

Standards and frameworks provide structured approaches to achieve acceptable risk levels. IEC 61508 is a generic

Maintaining safety-critical systems also involves ongoing monitoring, updates, and governance to address new hazards, software changes,

braking,
stability
control),
medical
devices
(life-supporting
equipment
and
implants),
nuclear
power
plant
instrumentation,
and
critical
industrial
automation.
In
these
areas,
designers
use
redundancy,
fail-safe
modes,
monitoring,
and
fault
tolerance
to
reduce
risk
and
ensure
safe
operation
even
when
components
fail.
and
rigorous
verification
and
validation.
It
emphasizes
safety-by-design,
traceability
of
requirements,
independent
assessment,
and
robust
configuration
management.
Software
for
safety-critical
systems
often
undergoes
heightened
scrutiny,
including
formal
methods,
exhaustive
testing,
code
reviews,
and
documentation
of
safety-related
behavior.
safety
standard;
sector-specific
variants
include
ISO
26262
for
road
vehicles,
EN
50126/50128/50129
for
rail,
DO-178C
for
avionics
software,
IEC
62304
for
medical
device
software,
and
IEC
61511
for
process
industries.
Safety
integrity
levels
(SIL)
or
Automotive
Safety
Integrity
Levels
(ASIL)
quantify
the
required
reliability
and
fail-safety
measures.
and
evolving
threats,
balancing
safety,
cost,
and
performance.