Apollo TLI Tutorial

[@heplegf]

Curious about the impact of NOT making the TB6p correction, we are talking about something on the order of micro-secs, correct?

[@nuclearandspaceeducation3201]

The S4B will always fly itself, so nothing the astronaut will do except for a manual takeover of attitude or safing the booster will affect TLI. If the TB6 never happened inside the LVDC then the TLI would not happen. TB6 is a timer which runs the special TLI sequence. The entire booster has these time bases which only happen at the completion of the previous time base because if the entire sequence were loaded based on MET it is possible for the sequence to get off by possible false event detection by faulty equipment leading to catastrophic damage to the vehicle. So it is not a time correction, it is actually the loading of a new sequencer to ensure vehicle safety by not doing something like lighting the S2 just moments after launch.