Changes and additions:
- June 2: Posting initial release
- June 15: Launch date moved to June 17
- June 30: Updating for July 11 launch
- July 11: Updating for July 12 launch
- July 12: Updating for July 13 launch
- July 14: Updating for July 15 launch

Editor's Note: The launch window is roughly 10 minutes long. To maximize ascent performance, NASA targets the middle of the window. A final hold in the countdown at the T-minus nine-minute mark will be extended as required to hit the desired launch time.

EDT...........EVENT

Wednesday, July 15

08:38 AM......Resume countdown (T-minus 6 hours)
08:38 AM......LO2, LH2 transfer line chilldown
08:48 AM......Main propulsion system chill down
08:48 AM......LH2 slow fill
09:18 AM......LO2 slow fill
09:23 AM......Hydrogen ECO sensors go wet
09:28 AM......LO2 fast fill
09:31 AM......Crew medical checks
09:38 AM......LH2 fast fill
11:38 AM......LH2 replenish
11:38 AM......LO2 replenish

11:38 AM......Begin 2-hour 30-minute built-in hold (T-minus 3 hours)
11:38 AM......Closeout crew to white room
11:38 AM......External tank in stable replenish mode
11:53 AM......Astronaut support personnel comm checks
12:18 PM......Crew photo op (recorded)
12:23 PM......Pre-ingress switch reconfig
12:54 PM......NASA TV coverage begins
01:41 PM......Final crew weather briefing
01:51 PM......Crew suit up begins
02:08 PM......Resume countdown (T-minus 3 hours)

02:13 PM......Crew departs O&C building
02:43 PM......Crew ingress
03:33 PM......Astronaut comm checks
03:58 PM......Hatch closure
04:28 PM......White room closeout

04:48 PM......Begin 10-minute built-in hold (T-minus 20m)
04:58 PM......NASA test director countdown briefing
04:58 PM......Resume countdown (T-minus 20m)

04:59 PM......Backup flight computer to OPS 1
05:03 PM......KSC area clear to launch

05:09 PM......Begin final built-in hold (T-minus 9m)
05:39 PM......NTD launch status verification
05:54:10 PM...Resume countdown (T-minus 9m)

05:55:40 PM...Orbiter access arm retraction
05:58:10 PM...Launch window opens
05:58:10 PM...Hydraulic power system (APU) start
05:58:15 PM...Terminate LO2 replenish
05:59:10 PM...Purge sequence 4 hydraulic test
05:59:10 PM...IMUs to inertial
05:59:15 PM...Aerosurface steering profile
05:59:40 PM...Main engine steering test
06:00:15 PM...LO2 tank pressurization
06:00:20 PM...GOX vent arm retraction
06:00:35 PM...Fuel cells to internal reactants
06:00:40 PM...Clear caution-and-warning memory
06:01:10 PM...Crew closes visors
06:01:13 PM...LH2 tank pressurization
06:02:20 PM...Orbiter to internal power
06:02:39 PM...Shuttle computers take control of countdown
06:02:49 PM...SRB steering test
06:03:03 PM...Main engine start (T-6.6 seconds)
06:03:10 PM...SRB ignition (LAUNCH)