"On launch day, we're hoping for it NOT to be exciting.  We are purposely failing a launch vehicle to make sure our abort system works." Kathy Lueders,

NOT an instantaneous window.  Could go at any point in the 4hr window.  "You all might be waiting a while as we find the perfect time to do this test." -Kathy

Today, practiced day-of-launch crew suit-up, transport to pad, and ingress.  

Benji Reed, SpaceX: "This allows us to test the entire crew system.

Abort will trigger 84-seconds into flight.

Benji connecting back to #SoyuzMS10 in flight abort in reality and how that hit home of the importance of #IFA.

Over 700 tests of the SuperDracos (the abort engines) have been conducting.

Looking at extending launch window to be MORE THAN 4 hrs to achieve test.

eather considerations INCLUDE landing location weather and sea states.

This booster was the first Block 5 Falcon 9, and the Starlink following 3 days later is the same booster that launches Demo-1 in 2019.

4km downrange, 19km altitude are new distance targets for when the abort triggers.

Splashdown 30-35km offshore depending on winds.

Waves offshore should get better the further into the day we go.  Waves for recovery and that weather are NOT including in launch weather forecast.

Trying to find a time when launch weather and recovery weather align.  Recovery weather "will gradually get better as we move through the day." -Mike (weather guy).

Sat: Launch weather good; recovery weather better toward end of window.
Sun: launch weather bad; recovery weather good.
Mon: Launch weather better into window, recovery weather worse into window.

This is a full Crew Dragon.  Only difference is it doesn't have the equipment not needed for docking, etc, 'cause it's not going to orbit.

Two dummies are on board to monitor conditions.
4Gs of force in abort expected.

Falcon 9 engine shutdown and abort trigger is programmed, not manually triggered.

uperDraco burn will be 10secs.  Dragon will hit mach 2.5 speed.

AFTS will be armed for tomorrow's test but "likely" won't activate in the abort.

Per the AFTS, because the engines are shutting down (thrust termination), the AFTS is not expected to blow the F9.  And Benji believes that would be true of a regular F9 if it encountered an engine shutdown failure in flight.  

After this test, this Dragon capsule's future "will be assessed" after SpaceX evaluates how it held up in the test.

After this test, what's next before crew?  
-IFA data and test flight reviews
-Some more parachute system-levels test ('has been operating very well')
-Joint paperwork and team reviews from SpX and NASA.

Falcon 9 will be going a little faster than Mach 1.8 at abort trigger.

This is the most difficult time for an abort to occur, so doing the abort at that time gives confidence it will work at less-stressful points in flight.

New T-0 of 10:00 a.m. EST to optimize for decreasing winds in the recovery area