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Exploration Flight Test-1 - Wikipedia Jump to content

Exploration Flight Test-1

From Wikipedia, the free encyclopedia

"OFT 1" and "EFT 1" redirect here. For other uses, see OFT (disambiguation) and EFT (disambiguation).
Exploration Flight Test-1
Launch of EFT-1 on December 5, 2014
NamesOrion Flight Test-1 (OFT-1)
Mission typeTechnology demonstration
OperatorNASA
COSPAR ID2014-077A Edit this at Wikidata
SATCAT no.40329Edit this on Wikidata
Mission duration4 hours, 24 minutes
Orbits completed2
Spacecraft properties
SpacecraftOrion CM-001
Spacecraft typeOrion
ManufacturerLockheed Martin
Start of mission
Launch dateDecember 5, 2014, 12:05 (2014-12-05UTC12:05Z) UTC (7:05 am EST)[1][2]
RocketDelta IV Heavy
Launch siteCape Canaveral, SLC-37B
ContractorUnited Launch Alliance
End of mission
Recovered byUSS Anchorage
Landing dateDecember 5, 2014, 16:29 (2014-12-05UTC16:30Z) UTC (8:29 am PST)
Landing sitePacific Ocean, 640 mi (1,030 km) SSE of San Diego (23°37′N 114°28′W / 23.61°N 114.46°W / 23.61; -114.46 (EFT-1 splashdown))
Orbital parameters
Reference systemGeocentric
Apogee altitude5,800 km (3,604 mi)

Mission insignia

Exploration Flight Test-1 or EFT-1 (previously known as Orion Flight Test 1 or OFT-1) was a technology demonstration mission and the first flight test of the crew module portion of the Orion spacecraft. Without a crew, it was launched on December 5, 2014 at 12:05 UTC (7:05 am EST, local time at the launch site) by a Delta IV Heavy rocket from Space Launch Complex 37B at the Cape Canaveral Air Force Station.[3]

The mission was a four-hour, two-orbit test of the Orion crew module featuring a high apogee on the second orbit and concluding with a high-energy reentry at around 8.9 kilometers per second (20,000 mph).[4] This mission design corresponds to the Apollo 2/3 missions of 1966, which validated the Apollo flight control system and heat shield at re-entry conditions planned for the return from lunar missions.

Objectives

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Rendering of Orion capsule and Delta IV upper-stage during EFT-1

EFT-1 tested several systems of the crew module portion of the Orion spacecraft, including separation events, avionics, heat shield performance, parachutes, and recovery operations. The uncrewed test flight served as a precursor to Orion’s first mission aboard the Space Launch System (SLS) on Artemis I. Because the European Service Module was not yet available, Orion flew with a structural representation. It also carried only a partial launch abort system, limited to the motor used to jettison the system at the end of launch, along with an Orion-to-stage adapter designed for future use with the SLS.[5]

For the mission, Orion remained attached to the dummy service module, which itself was connected to the Delta IV Heavy’s upper stage. This stage was nearly identical to the Interim Cryogenic Upper Stage planned for the Block 1 version of the SLS. Unlike future flights, Orion relied on internal batteries for power rather than photovoltaic arrays.[6]

Data returned from EFT-1 informed Orion’s design and were incorporated into its critical design review (CDR) in April 2015.[7] These results helped pave the way for the Artemis I mission, which launched on November 16, 2022,[8] more than seven years after EFT-1.

Vehicle assembly

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Orion CM-001 used on the EFT-1 mission was built by Lockheed Martin.[9] On June 22, 2012, the final welds of the EFT-1 Orion were completed at the Michoud Assembly Facility in New Orleans, Louisiana.[9] It was then transported to Kennedy Space Center's Operations and Checkout Building, where the remainder of the spacecraft was completed.[10] The Delta IV rocket was put in a vertical position on October 1, 2014, and Orion was mated with the vehicle on November 11.[11][12][13]

Flight

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Mission diagram

The four-and-a-half-hour flight took the Orion spacecraft on two orbits of Earth. Peak apogee was approximately 5,800 kilometres (3,600 mi). The distance allowed the spacecraft to reach reentry speeds of up to 8.9 km/s (20,000 mph), which exposed the heat shield to temperatures up to around 2,200 °C (4,000 °F).[4][5]

Time Event
L‑6:00:00 Orion powered on, mobile service tower retracts, fueling of Delta IV Heavy begins
0:00:00 Launch (7:05 a.m. EST, 12:05 UTC)
0:01:23 Max q
0:01:23 Vehicle is supersonic
0:03:56 Booster separation
0:05:30 First stage MECO (main engine cut-off)
0:05:33 First stage separation
0:05:49 Second stage ignition No. 1
0:06:15 Service module fairing jettison
0:06:20 Launch Abort System jettison
0:17:39 SECO No. 1 (second engine cut-off), Orion begins first orbit
1:55:26 Orion completes first orbit, second stage ignition No. 2
2:00:09 SECO No. 2
2:05:00 Enter first high radiation period
2:20:00 Leave first high radiation period
2:40:00 Reaction control system (RCS) activation
3:05:00 Reach peak apogee: 5,800 km (3,600 mi)
3:23:41 Orion separates from combined service module/second stage, second stage performs disposal burn
3:57:00 Orion positions for reentry
4:13:41 Entry interface
4:20:22 Forward bay cover jettisons, parachute deployment begins (two drogues, three mains)
4:24:46 Splashdown and recovery by the USS Anchorage crew

After splashdown in the Pacific Ocean, crews from the USS Anchorage recovered the EFT-1 Orion crew vehicle. Plans were later made to outfit the capsule for an ascent abort test in 2017.[15]

Launch attempts

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Attempt Planned Result Turnaround Reason Decision point Weather go (%) Notes
1 4 Dec 2014, 7:05:00 am Scrubbed — Weather 4 Dec 2014, 9:44 am ​(T−00:03:09) A boat entered the launch range, wind gusts in excess of speed limit (21 kn or 24 mph or 39 km/h), and a fuel fill and drain valve did not close. 24-hour recycle.
2 5 Dec 2014, 7:05:00 am Success 1 day 0 hours 0 minutes

Public outreach

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NASA heavily promoted the mission, collaborating with Sesame Street and its characters to educate children about the flight test and the Orion spacecraft.[16]

The Orion capsule used for EFT-1 is now on display at the Kennedy Space Center Visitor Complex, in the "NASA Now" exhibit.[17]

[edit]
  • First weld on the EFT-1 Orion structure, September 2011
    First weld on the EFT-1 Orion structure, September 2011
  • Orion structure after final weld, June 2012, at the Michoud Assembly Facility
    Orion structure after final weld, June 2012, at the Michoud Assembly Facility
  • Orion's Service Module prior to encapsulation, December 2013, in the Operations and Checkout Building (O&C)
    Orion's Service Module prior to encapsulation, December 2013, in the Operations and Checkout Building (O&C)
  • EFT-1 Orion Weight and Center of Gravity Test, June 2014
    EFT-1 Orion Weight and Center of Gravity Test, June 2014
  • EFT-1 Orion back shell tile installation, September 2014
    EFT-1 Orion back shell tile installation, September 2014
  • Completed EFT-1 Orion, September 2014
    Completed EFT-1 Orion, September 2014
  • EFT-1 Orion in fairing and with LES, October 2014
    EFT-1 Orion in fairing and with LES, October 2014
  • EFT-1 Orion on its Delta IV Heavy
    EFT-1 Orion on its Delta IV Heavy
  • EFT-1 Orion on its Delta IV Heavy
    EFT-1 Orion on its Delta IV Heavy
  • Earth seen from the EFT-1 Orion spacecraft
    Earth seen from the EFT-1 Orion spacecraft
  • The EFT-1 Orion before splashdown, 5 December 2014
    The EFT-1 Orion before splashdown, 5 December 2014
  • Recovery of the EFT-1 Orion by the USS Anchorage, 5 December 2014
    Recovery of the EFT-1 Orion by the USS Anchorage, 5 December 2014
  • Recovery of Orion capsule
    Recovery of Orion capsule
  • Recovery of Orion capsule
    Recovery of Orion capsule

References

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  1. ^ Rhian, Jason (March 14, 2014). "NASA's EFT-1 Mission Slips to December". SpaceFlight Insider. Archived from the original on May 13, 2016. Retrieved December 7, 2014.
  2. ^ Siceloff, Steven (December 5, 2014). "LIFTOFF! Orion Begins New Era in Space Exploration!". Orion. NASA. Retrieved December 7, 2014.
  3. ^ Foust, Jeff (December 5, 2014). "Delta 4 Heavy Launches Orion on Second Attempt". SpaceNews. Retrieved February 24, 2023.
  4. ^ a b Bergin, Chris (November 14, 2011). "EFT-1 Orion Receives Hatch Door—Denver Orion Ready for Modal Testing". NASASpaceflight.com. Retrieved November 16, 2011.
  5. ^ a b "Orion First Flight Test – NASA Facts" (PDF). NASA. Retrieved October 10, 2014.
  6. ^ "OFT-1: NASA gearing up for Orion's 2013 debut via Delta IV Heavy". August 8, 2011. Archived from the original on June 15, 2013. Retrieved November 16, 2011.
  7. ^ "EFT-1 September, 2014 launch date "paced" by the Delta IV-H". nasaspaceflight.com. November 7, 2012.
  8. ^ "NASA: Artemis I". NASA. Retrieved September 2, 2022.
  9. ^ a b Clark, Stephen (June 26, 2012). "Space-bound Orion capsule to arrive in Florida next week". SpaceFlightNow. Retrieved June 28, 2012.
  10. ^ "NASA Unveils Orion During Ceremony". NASA. July 2, 2012. Retrieved July 3, 2012.
  11. ^ "NASA’s Orion Spacecraft, Rocket Move Closer to First Flight" NASA. Retrieved: October 5, 2014.
  12. ^ "Orion Spacecraft Complete" Archived October 31, 2014, at the Wayback Machine NASA. Retrieved: October 30, 2014.
  13. ^ "Orion Arrives at Launch Pad" Archived November 12, 2020, at the Wayback Machine NASA. Retrieved: November 12, 2014.
  14. ^ NASA. "Orion Exploration Flight Test-1" (PDF). Retrieved December 15, 2014.
  15. ^ Stephen Clark (November 23, 2011). "Cracks discovered in Orion capsule's pressure shell". Spaceflightnow.com. Retrieved November 23, 2011.
  16. ^ NASA (November 24, 2014). "Sesame Street Characters 'On Board' as NASA Counts Down to Orion's Test Flight". NASA.gov. Retrieved December 6, 2014.
  17. ^ "Orion EFT-1 flown spacecraft joins display in 'NASA Now' exhibit | collectSPACE". collectSPACE.com. Retrieved September 21, 2020.
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