fail - faul
- fail
- fail actively
- fail closed
- fail in service, fail in use
- fail light
- fail off chance
- fail open
- fail passively
- fail prematurely
- fail stochastically
- fail to function
- fail(ed)-dangerous
- fail-active
- fail-active design
- fail-active device
- fail-operational, fail-operative
- fail-operative configuration
- fail-operative system
- fail-passive
- fail-passive design
- fail-passive device
- fail-safe
- fail-safe analysis
- fail-safe arrangement
- fail-safe behavior
- fail-safe circuit
- fail-safe concept
- fail-safe construction
- fail-safe control
- fail-safe design
- fail-safe facility
- fail-safe feature
- fail-safe index
- fail-safe operation
- fail-safe philosophy
- fail-safe procedure
- fail-safe state
- fail-safe structure
- fail-safe system
- fail-safe test procedure
