Assertion: space shuttle's engine | /r/HasProperty | ignited before liftoff
Facets:
value: at six seconds
type: TEMPORAL
Source sentences:
text: The three Space Shuttle main engines (SSMEs) were ignited roughly 6.6 seconds before liftoff, and computers monitored their performance as they increased thrust.
text: The shuttle’s main engines are ignited at six seconds before lift-off.