.jpg) SpaceX CRS-3 Dragon spacecraft approaching ISS on 20 April 2014 | |
| Names | SpX-3 |
|---|---|
| Mission type | ISS resupply |
| Operator | SpaceX |
| COSPAR ID | 2014-022A |
| SATCATno. | 39680 |
| Mission duration | 29 days, 23 hours, 38 minutes |
| Spacecraft properties | |
| Spacecraft | Dragon 1 C105 |
| Spacecraft type | Dragon 1 |
| Manufacturer | SpaceX |
| Launch mass | 6,000 kg (13,000 lb) |
| Dimensions | Height: 8.1 m (27 ft) Diameter: 4 m (13 ft) |
| Start of mission | |
| Launch date | 18 April 2014, 19:25:21 UTC[1] |
| Rocket | Falcon 9 v1.1 (B1006) |
| Launch site | Cape Canaveral,SLC-40[2][3] |
| End of mission | |
| Disposal | Recovered |
| Landing date | 18 May 2014, 19:05 UTC |
| Landing site | Pacific Ocean |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Low Earth orbit |
| Inclination | 51.65° |
| Berthing atInternational Space Station | |
| Berthing port | Harmonynadir |
| RMS capture | 20 April 2014, 11:14 UTC |
| Berthing date | 20 April 2014, 14:06 UTC |
| Unberthing date | 18 May 2014, 11:55 UTC |
| RMS release | 18 May 2014, 13:26 UTC |
| Time berthed | 27 days, 21 hours, 49 minutes |
| Cargo | |
| Mass | 2,089 kg (4,605 lb) |
| Pressurised | 1,518 kg (3,347 lb) |
| Unpressurised | 571 kg (1,259 lb) |
 NASA SpX-3 mission patch | |
SpaceX CRS-3, also known asSpX-3,[4] was aCommercial Resupply Service mission to theInternational Space Station (ISS), contracted toNASA, which was launched on 18 April 2014. It was the fifth flight forSpaceX's uncrewedDragoncargo spacecraft and the third SpaceX operational mission contracted toNASA under aCommercial Resupply Services (CRS-1) contract.
This was the first launch of a Dragon capsule on theFalcon 9 v1.1launch vehicle, as previous launches used the smallerv1.0 configuration. It was also the first time the F9 v1.1 has flown without apayload fairing, and the first experimental flight test of anocean landing of the first stage on a NASA/Dragon mission.[5]
The Falcon 9 with CRS-3 on board launched on time at 19:25UTC on 18 April 2014,[1] and was grappled on 20 April at 11:14 UTC byExpedition 39 commanderKoichi Wakata. The spacecraft was berthed to the ISS from 14:06 UTC on that day to 11:55 UTC on 18 May 2014.[6] CRS-3 then successfully de-orbited and splashed down in thePacific Ocean off the coast ofCalifornia at 19:05 UTC on 18 May 2014.[7]
The launch was notionally scheduled by NASA, as of November 2012, to be no earlier than 30 September 2013, with berthing to the station occurring three days later on 2 October 2013.[8] By March 2013, the launch was scheduled by NASA for no earlier than 28 November 2013, with berthing to the station occurring three days later on 1 December 2013.[9] By August 2013, the launch date had been moved to no earlier than 15 January 2014,[10][11] but by October 2013 it was moved to 11 February 2014.[12] As of 23 January 2014, the launch was rescheduled again to 1 March 2014,[13] and then rescheduled to 16 March 2014 in early February 2014. The several delays — from the nominal December 2013 date that had been in place since early 2013 — have been mostly due to limited berthing windows in the ISSVisiting Vehicle schedule, and delays to bothOrbital Sciences Corporation's Cygnus and SpaceX's Dragon resulted from the December 2013 cooling issue on the ISS which required several spacewalks to mitigate.[14]
On 12 March 2014, the launch was rescheduled to 30 March or 2 April 2014, for a variety of reasons including data buffering issues, working some issues with theEastern Range, some operational issues with the new Dragon design, and some contamination of the impact shielding blanket. SpaceX ultimately decided to move forward and use the shielding blanket with the minor contamination problems, believing it would not impact the optical payloads being carried in the Dragon trunk.[15][16] On 26 March 2014, a further delay was announced related to a fire at one of the radar facilities on the Eastern Range. There is mandatory radar coverage for any launches from Cape Canaveral, and the fire forced a delay until that section of the launch trajectory could be covered, possibly by alternative means that would have telemetry communication capability to the Air Force facility responsible for launch safety.[17]
By 4 April 2014, the Eastern Range radars were repaired and back online to support launches, and the CRS-3 launch was slated for no earlier than 14 April 2014 with a backup date of 18 April 2014, contingent upon aUnited Launch Alliance (ULA)Atlas V flight scheduled for as early as 10 April 2014.[18] On 11 April 2014, the International Space Station (ISS) suffered a failure of an external computer known as aMultiplexer/Demultiplexer (MDM), which required a spacewalk on 22 April 2014 to replace in order to restore vital redundancy to the station. Despite the challenges, the CRS-3 mission – which could have been impacted by the MDM failure – was still on for 14 April 2014,[19] with ISS berthing scheduled to take place two days later on 16 April 2014.[20] However, during the launch attempt on 14 April 2014, a primary helium supply valve used in the stage separation system failed a pre-launch diagnostic test approximately one hour prior to the scheduled launch, so the SpaceX launch manager scrubbed the mission. In ground tests following the scrub, the redundant backup helium supply valve tested okay so the mission would likely have succeeded; however, it is SpaceX policy to not launch with any known anomalies.[21]
The launch was immediately rescheduled for no earlier than the backup date, 18 April 2014.[22] That date was confirmed two days later, following replacement of the defective valve, but also noted that weather constraints may prevent the launch on 18 April 2014 from occurring at the instantaneous launch window of 19:25 UTC. If that launch had been scrubbed, the next launch window would have been 19 April 2014 at 19:02 UTC.[21]
On 18 April 2014 at 19:25:21 UTC, the vehicle was successfully launched.[1] Hours prior to the launch, aliquid oxygen leak in theground support equipment was detected; SpaceX engineers applied water from thefire suppression system, which froze on contact with the liquid oxygen and plugged the leak. Excess water pooled in theflame trench and dramatically surged upwards as the engines ignited, covering the rocket with grime and soot. Despite the unusual event, the rocket was unlikely to have been in any danger.[23]
NASA has contracted for the CRS-3 mission from SpaceX and therefore determines the primary payload, date/time of launch, andorbital parameters for the Dragonspace capsule.
Among other NASA cargo, including repair parts for the ISS, the SpaceX CRS-3 mission carried a large number of experiments to the space station, including:[5]
The 1,600 kg (3,500 lb) ofdownmass cargo[29] from the mission was returned to thePort of Long Beach viamarine vessel on 20 May 2014, two days aftersplashdown. Time-sensitive cargo are unloaded inCalifornia and flown to NASA receiving locations. The remainder of the cargo will be unloaded and transferred to NASA at theSpaceX McGregor test facility inTexas, where the Dragon capsule will be fully decommissioned and defueled.[30] Water was found inside the Dragon capsule but preliminary checks indicated that no scientific equipment had been damaged. The source of the water has not been confirmed and will be investigated during the decommissioning of the capsule.[29]
In addition to theprimary payload, a Dragon cargo capsule resupply space transport mission to the ISS for NASA, SpaceX deployed fivesecondary payloadCubeSats on the CRS-3 Falcon 9 mission.[31] The CubeSats are part of theELaNa-V mission partially funded under NASA "Educational Launch of Nanosatellites" program. These spacecraft were released from fourPoly Picosatellite Orbital Deployers (PPODs) attached to the second stage of the Falcon 9 following the separation of the Dragon from the second stage:[5]
.jpg)
The CRS-3 mission was the fourth launch of the v1.1 version of the Falcon 9, and the second on which the first-stage booster was used after the mission for abooster descent and landingflight test.
In an arrangement unusual for launch vehicles, thefirst-stage of theSpaceXFalcon 9 launch vehicle conducted a propulsive-return over-watertest after the second stage with the Dragon CRS-3 payloadseparated from the booster. This was the second high-altitude post-mission test of this type, after the first test onFalcon 9 Flight 6 in September 2013.[41]
During the 18 April 2014 test, the CRS-3 booster became the first successful controlled ocean soft touchdown of aliquid-rocket-engine orbital booster.[42] The booster included landing legs for the first time which were extended for the simulated "landing", and the test utilized more powerful gaseous nitrogencontrol thrusters than had been used in theprevious test to better control aerodynamic-induced rotation. The booster stage successfully approached the water surface with no spin and at zero vertical velocity, as designed. The SpaceX team was able to receive video from cameras placed on the first-stage booster during soft landing test, as well as vehicle telemetry recorded by aircraft, but swells of 4.6–6.1 m (15–20 ft) were reported in the anticipated recovery area. The first stage successfully hovered over the ocean surface, but heavy waves destroyed the stage before boats were able to retrieve it.[43][44][45]
This article incorporates text from this source, which is in thepublic domain.Today's launch has been scrubbed due to a Helium leak on Falcon 9's first stage. A fix will be implemented by the next launch opportunity on Friday April 18, though weather on that date isn't ideal. Check back here for updates.
This article incorporates text from this source, which is in thepublic domain. This article incorporates text from this source, which is in thepublic domain. This article incorporates text from this source, which is in thepublic domain.
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