Flight 188 - uppsagd

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Data relating to Flight 188Compared with the ARIANE 5 “generic” version of the booster stage, the main changes includethe elimination of one GAT cylinder, overloading of segment S1 to increase thrust on lift-off, andthe use of a reduced mass nozzle (This reduces the mass of the structure by about 1.8tonnes.). This launch will use welded segment MPS solid rocket motors for the seventh time,following L534/flight 174, L536/flight 176, L537/flight 177, L538/flight 179 and L540/V183 andL545/V187.Type-A cryogenic upper stage:The ESC-A 3 rd stage has been developed for the ARIANE 5 ECA version of the ARIANE 5 Pluslauncher, and is based on the HM7B engine previously used for the 3 rd stage of the Ariane 4launcher.The ESC-A stage comprises:• two tanks containing 14.7 tons propellant (LH 2 and LOX),• HM7B engine delivering 6.5 tons thrust in vacuum for a burn time of about 925s. TheHM7B nozzle is swivel-mounted (two axes) for attitude control.To meet the needs of the mission, the ESC-A stage has a single helium sphere to cover thestage tank pressurisation and solenoid valve control requirements.The ESC-A and the SCAR systemThe ESC-A delivers the additional energy required to place the payloads into target orbit. Thisstage also provides a roll control function for the upper composite during the powered flightphase, and orients the payloads ready for separation during the ballistic phase using the SCAR(attitude and roll control system).6
Data relating to Flight 188ESC-A thrust frame© EADS STAriane 5 ECA launcher in transit to launch pad ZL3 for thelaunch sequence rehearsal (RSL)© Ds23230ESA/ARIANESPACE/Service optique CSGType C vehicle equipment bay:The vehicle equipment bay (VEB) is a cylindrical carbon structure mounted on the ESC-Astage. The VEB contains part of the electrical equipment required for the mission (two OBCs,two new definition inertial guidance units, sequencing electronics, electrical power supplies,telemetry equipment, etc.).The upper composite (ESC-A stage + VEB + 3936 cone) for launcher L546 was assembledfor the eighth time at the Astrium ST site in Bremen, in order to meet needs resulting from theincrease in production rates for the coming years.Assembly of the upper composite at the Bremen site© EADS Astrium7
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Flight 188 - uppsagd

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