space news from around the webin association with SpaceNews

Engine problem blamed for Ariane 5 failure
Posted: Wed, Aug 8, 2001, 10:33 AM ET (1433 GMT)
Ariane 5 liftoff on Flight 142 A combustion problem with an upper stage engine has been identified as the cause of a failed Ariane 5 launch last month according to a report released Tuesday. An inquiry board found that a "combustion instability" in the Aestus engine that powers the booster's upper stage degraded the engine's performance, lowering its thrust and causing it to use more of one propellant than planned. The engine ran out of that propellant and shut down earlier than planned, stranding its payload of two communications spacecraft in a lower than planned orbit. The combustion instability was traced to a dynamic hydraulic coupling between the propellant feed system and combustion chamber circuits. The inquiry board recommended a number of changes to the engine and upper stage that will keep the Ariane 5 grounded until late November. However, the problem with the Ariane 5 does not also affect the Ariane 4; its next launch is scheduled for late this month. One of the two spacecraft launched on that July 12 flight, ESA's Artemis communications technology satellite, is in the process of being gradually moved into geosynchronous orbit using the spacecraft's onboard ion thrusters. However, the other, the Japanese BSAT-2b direct TV spacecraft, likely cannot be salvaged.
<<previous article   next article>>
news in brief

"Monster" planet puzzles astronomers
Posted: Sun, Nov 5 10:14 AM ET (1514 GMT)

Chairman of House Science Committee to retire
Posted: Sun, Nov 5 10:13 AM ET (1513 GMT)

news links
Thursday, November 23
Cover Story: The ultimate frontier market
The Edge Daily (Malaysia) — 1:58 am ET (0658 GMT)
Next-generation weather satellite in orbit, gets new name
Huntsville Times — 1:56 am ET (0656 GMT)
Successful First International Moon Village Workshop at ISU
International Space University — 1:53 am ET (0653 GMT)
The Short Life and Death of a Space Tourism Company
Air & Space — 1:51 am ET (0651 GMT)
Building for a Future in Space
University College Dublin Observer — 1:47 am ET (0647 GMT)

about   ·   ·   mailing list