You are listening to a command center before the liftoff of a rocket. You hear the following: "T minus 10 seconds... go for
main engine start... T minus 9...8...7...6...5...4...3...2...1... we have liftoff."
Rocket clears
launchpad tower
6 seconds after liftoff
Launch
verification
16 seconds before
liftoff
Main engine start
3 seconds before
liftoff
Rocket topping
sequence complete
Launch control
system enabled
Boosters ignite
110 seconds before
liftoff
90 seconds before
liftoff
Liftoff
Name an event that could occur at -150 seconds. Describe when the event occurs in the order of events shown.
B
U
T² T₂
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