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Expedition 15 briefing
In advance of launching the Expedition 15 mission to the International Space Station, NASA officials preview the flight's objectives and challenges in this news briefing held March 27 at Johnson Space Center.

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Expedition 14 recap
As the International Space Station's Expedition 14 winds down, officials managing the flight from Mission Control in Houston hold this retrospective briefing to talk about the mission.

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STS-47: Spacelab Japan
The 50th flight of the space shuttle took place in September 1992. Endeavour's mission featured the Spacelab-J research module for Japan, as well as the first black female astronaut and the first married couple to fly together in space. The crew narrates the highlights in their post-flight film.

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STS-46: Unreeling the tethered satellite
Shuttle Atlantis' summer 1992 flight provided the chance to test a revolutionary payload -- the Tethered Satellite System. A snag in the tether prevented a small satellite from reeling miles away from the shuttle as planned, the partial deployment showed power generation using the shoelace-size tether could work. The STS-46 mission also released the European Retrievable Carrier spacecraft to begin a year-long stay in orbit. The astronauts narrate highlights from the flight in this movie.

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Anomalous behaviour affects Vega firing test
EUROPEAN SPACE AGENCY NEWS RELEASE
Posted: March 29, 2007

 

On Wednesday 28 March, at around 15:00, the second firing test of the solid rocket motor 'Zefiro 9' - the motor that will power the third stage of ESA's future small launcher Vega - took place at the Salto Di Quirra Inter-force Test Range in Sardinia, Italy.

The first results of the test indicate that the behaviour of the motor and the actuation of the nozzle were in accordance with predictions up until 35 seconds after ignition, when a sudden drop in the motor's internal pressure was detected. The pressure stabilised at a value lower than the nominal, leading to a longer combustion time than the expected 105 seconds.

More than 400 sensors fitted to the motor monitored its behaviour during and after the firing test. The first visual investigation conducted on site after the firing showed that the nozzle of the motor was damaged, but no further damage was observed on the motor case or on the test bench.

ESA and Industry teams have already started a thorough analysis and assessment of the data collected during the test. The causes of the anomaly have not been identified yet and an investigation board is being set up for this purpose. The board shall recommend preventative and other appropriate actions to preclude the recurrence of similar anomalies for the finalisation of the motor qualification.

This was the second firing test of the Zefiro 9 motor. The first test took place successfully in December 2005. The first firing tests of the other Vega solid rocket motors - Zefiro 23 (second stage) and P80 (first stage) held on 26 June 2006 at Salto di Quirra and on 30 November 2006 in Kourou respectively, also went well. Three more firing tests, in the years 1999-2000, were conducted successfully for the Zefiro 16 motor, the forerunner of the Zefiro family of solid rocket motors.

The Zefiro 9 motor is developed by AVIO SpA and is based on advanced technologies in the field of solid rocket propulsion. It has an overall height of 3.17 m and a diameter of 1.92 m, contains approximately 10 tonnes of propellant and provides a maximum thrust of 305 kilonewton in vacuum.

Vega is a single body launcher composed of three solid propellant stages and a liquid propellant upper module. It is approximately 30 metres high and weighs a total of 137 tonnes at lift-off. Vega will be able to launch satellites of up to 1500 kg into a 700 km-altitude polar orbit, and it will also be useable in a wide range of scientific and Earth observation missions. The maiden flight for ESA's small launcher remains scheduled to take place in 2008.

The Vega launcher is being developed with the support of seven ESA Member States (Italy, France, Belgium, Switzerland, Spain, the Netherlands and Sweden). ESA has contracted the development activities of the launcher to ELV SpA, a joint venture between Avio SpA and the Italian Space Agency (ASI).