The Endeavour astronauts donned their bright orange spacesuits and went to the launch pad Friday to board the space shuttle for a countdown dress rehearsal and emergency evacuation training.

Commander Mark Kelly, pilot Greg Johnson, flight engineer Roberto Vittori and spacewalkers Drew Feustel, Mike Fincke and Greg Chamitoff conducted the simulation in preparation for the April 19 launch to the International Space Station.

The Astrovan delivered the astronauts to the seaside pad around 10:45 a.m. EDT to begin entering the orbiter and taking their assigned seats just like the actual countdown.

Clocks ticked down to T-minus 4 seconds before ending with a mock abort at about 2:05 p.m.

The Terminal Countdown Demonstration Test concluded with the astronauts exiting the shuttle to practice evacuation procedures and jumping in the escape baskets hanging on the launch tower.

Here's a collection of NASA-KSC photos from the day's activities:

Photo credit: NASA

Commander Mark Kelly   Mission specialist Greg Chamitoff   Mission specialist Mike Fincke   Astronauts depart crew quarters   Astronauts depart crew quarters   Astronauts depart crew quarters   Commander Mark Kelly prepares to board Endeavour   Roberto Vittori and Mike Fincke at the pad   Flight engineer Roberto Vittori from Italy   Commander Mark Kelly in his seat   Pilot Greg Johnson in his seat   Mission specialist No. 1 Mike Fincke   Flight engineer Roberto Vittori from Italy   Drew Feustel on the middeck   Greg Chamitoff on the middeck   The middeck crew practices emergency exit   Roberto Vittori and Mike Fincke egress from flight deck   Inside the escape basket   Crew after the countdown   Roberto Vittori   Astronauts briefed on emergency procedures   Astronauts briefed on emergency procedures   Photos by NASA