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| Post mortem for CRS-3 Antares notes turbopump failure |
| 2014-11-05 |
| Post mortem for CRS-3 Antares notes turbopump failure. Engineers are methodically working through stacks of data related to last week's failure of the CRS-3/OrB-3 Antares launch vehicle. Orbital managers have noted that early data points to the failure of a turbopump on one of Antares' AJ-26 engines as the leading reason the rocket failed just seconds after launch. The company are now working towards "upgrading" the propulsion system with a new engine, ready for 2016. Antares Failure: Antares – along with her Cygnus spacecraft bound for the International Space Station (ISS) – were lost seconds after launch during Thursday's mission from Pad 0A at the Mid-Atlantic Regional Spaceport on Wallops Island, Virginia. The rocket made a nominal ascent off the pad, as Antares conducted her designed "Baumgartner Maneuver" – a subtle sideways step to ease the vehicle away from the close proximity of the Transporter/Erector/Launcher (TEL) – and ascended into the night sky. Once clear of the pad, the first sign of trouble was a distinct change to the appearance of the plume generated by her AJ-26 engines at T+14 seconds – suggesting oxidizer starvation in at least one engine – prior to the aft of the vehicle exploding a second later. Additional videos of varying quality showed a "ghost image" or visual artifact on the footage, which may provide extra insight into what transpired. The next event was sadly obvious, as propulsion was lost and the vehicle fell in flames, exploding near the pad from where she had just departed. The Flight Termination System (FTS) was activated just moments prior to the vehicle impacting the ground. It is understood the FTS command was successfully sent via the Range Safety system that employs fully steerable antennas, which track the rocket, as well as omni antennas which radiate in all directions. This ensures the rocket receives the command. This command results in the puncturing of the tank domes on the first stage and the motor dome on the second stage, causing the depressurization on each stage and rendering the vehicle non-propulsive. The root cause is being worked by the Antares launch failure Accident Investigation Board (AIB), which is being led by Orbital under the oversight of the Federal Aviation Administration (FAA). The board includes former Space Shuttle Program manager Wayne Hale and other industry experts. Photos and further analysis at the link |
| Posted by:3dc |
| #2 Obits? Cute, 3dc. |
| Posted by: trailing wife 2014-11-05 14:47 |
| #1 Orbital Announces Go-Forward Plan for NASA’s Commercial Resupply Services Program and the Company’s Antares Launch Vehicle -- Revised Approach Will Maintain Required ISS Cargo Deliveries in 2015 and 2016 -- -- Accelerated Propulsion System Upgrade of Antares to be Implemented at Wallops -- DULLES, Va.--(BUSINESS WIRE)--Nov. 5, 2014-- Orbital Sciences Corporation (NYSE: ORB), one of the world’s leading space technology companies, today announced comprehensive plans to fulfill its contract commitments under NASA’s Commercial Resupply Services (CRS) program as well as to accelerate an upgrade of the Antares medium-class launcher’s main propulsion system. Under the new approach and in line with Orbital’s existing CRS contract, all remaining cargo will be delivered to the International Space Station (ISS) by the end of 2016. There will be no cost increase to NASA and only minor adjustments will be needed to the cargo manifest in the near term. Orbital’s Antares launch failure Accident Investigation Board (AIB) is making good progress in determining the primary cause of last week’s failure. A preliminary review of telemetry and video data has been conducted and substantial debris from the Antares rocket and its Cygnus payload has been collected and examined. While the work of the AIB continues, preliminary evidence and analysis conducted to date points to a probable turbopump-related failure in one of the two Aerojet Rocketdyne AJ26 stage one main engines. As a result, the use of these engines for the Antares vehicle likely will be discontinued. To maintain the CRS program’s critical ISS supply line, Orbital plans an early introduction of its previously selected Antares propulsion system upgrade in 2016. This will be preceded by one or two non-Antares launches of the company’s Cygnus cargo spacecraft to the ISS in 2015-2016, employing the spacecraft’s compatibility with various launch vehicles and its flexibility to accommodate heavier cargo loads as launcher capacity permits. In addition, the company expects repairs to the Mid-Atlantic Regional Spaceport (MARS) launch complex at NASA’s Wallops Flight Facility to be undertaken quickly, allowing launch operations to continue at Wallops Island with the upgraded Antares beginning in 2016. “Orbital is taking decisive action to fulfill our commitments to NASA in support of safe and productive operations of the Space Station. While last week’s Antares failure was very disappointing to all of us, the company is already implementing a contingency plan to overcome this setback. We intend to move forward safely but also expeditiously to put our CRS cargo program back on track and to accelerate the introduction of our upgraded Antares rocket,” said Mr. David W. Thompson, Orbital’s Chairman and Chief Executive Officer. “Exact financial impacts to Orbital will depend on which of several specific options for near-term launches is selected, but they are not expected to be material on an annual basis in 2015. In all cases, no significant adverse effects are projected in 2016 or future years, in part because the cost of the Antares propulsion system upgrade was already part of our internal investment plan during that time,” he added. “We very much appreciate the tremendous support Orbital has received from NASA and Virginia’s MARS commercial spaceport team over the last seven years on our Antares rocket and CRS cargo programs. We look forward to working closely with them to quickly recover from last week’s setback,” Thompson concluded. |
| Posted by: 3dc 2014-11-05 13:56 |