Editing Apollo abort modes (section)

== Saturn V specific abort modes ==
During orbital abort phases (S-IVB to COI, S-IVB to orbit and Mode IV), modes II and III were available as backup modes in the event of further problems.

The EDS was enabled for the pad abort (beginning 5 minutes prior to launch) through abort mode IB phases. Beginning in mode IC, the EDS was switched off and aborts would have had to be commanded manually.

=== S-IVB to COI ===
("Saturn IV-B (NASA's designation for the Saturn V's third stage burn) To Contingency Orbit Insertion") In case of a failure of the [[S-II]] second stage, the stage would be jettisoned, and the rocket is high and fast enough that the [[S-IVB]] third stage, followed by the [[Apollo Command/Service Module|Service Module]] (SM) engine, has enough propellant to place the spacecraft in Earth orbit. There would not be enough propellant to perform [[trans-lunar injection]], so only an Earth-orbit mission would be performed.

=== S-IVB to Orbit ===
The failing S-II would again be jettisoned, but Earth orbit insertion is now possible by the S-IVB alone. Other than not using the SM engine, this is identical to an S-IVB to COI abort.