Jan C. Vorbrüggen wrote in
:

Slight clarification - before 360 there's insufficient energy for a
*single-engine* TAL. That was clear from context in Joe's original
post, but with people replying to it I fear the context will be lost.

So after a single SSME failure

Sorry, I see my "clarification" was nothing of the sort: "Single-engine
TAL" means a TAL with one engine remaining, two engines failed.

and negative return (which is when?),

Varies, always after T+3:40.

you have a "black hole" in the abort tree until 360s - at least before
the post- 51L changes which made bailout possible? Duh.

No. For a single engine failure, all the abort boundaries overlap so that
there is always an intact abort available. First TAL overlaps Negative
Return, last TAL overlaps Press to ATO.

There are black zones for two- and three-engine-out scenarios, though.


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