FTTI Explorer

The Fault Tolerant Time Interval (ISO 26262 Part 1) is the time a system can tolerate a fault before a hazardous event occurs. It is the budget every safety mechanism must fit inside: detect the fault, react, and reach a safe state — before physics catches up with you. FTTI drives safety-mechanism design more than almost any other number in a safety concept: it decides your monitoring cycle times, your watchdog windows, and whether your actuator is fast enough at all. Move the sliders and watch the fault-handling timeline race the hazard boundary.

Illustrative model only — constant-deceleration kinematics with instantaneous phase transitions. It is not certification math: a real FTTI determination models tyre dynamics, load transfer, actuator ramp-up, degraded modes, and the specific hazard scenario from the HARA. That's exactly the kind of tool I build for clients.