because a maximum workload target of 80% had been set for the SRI computer.
performed a nominal flight until approximately H0 + 37 seconds. investigations on the causes of the failure, the systems supposed to be
in order to verify :In these tests many equipment items were physically present and exercised
ground testing by injecting simulated accelerometric signals in accordance
at an altitude of approximately 4000 m. Therefore, all the launcher debris
specification.d) 22 seconds after H0 (command for main cryogenic engine ignition),
The function int maps a number to 37 seconds later, the rocket flipped 90 degrees in the wrong direction, and less than two seconds later, aerodynamic forces ripped the boosters apart from the main stage at a height of 4km. No weaknesses
Had the system been included, the failure could have been detected.t) Post-flight simulations have been carried out on a computer with
to the gravity axis and to find north direction from Earth rotation sensing. of the Ariane 5 Flight Control System and its software.a) During the launch preparation campaign and the count-down no events
and the Ring Laser Gyros via a dedicated test input connector with signals
failure of the inertial reference systems.The failure of the Ariane 501 was caused by the complete loss of guidance
The rocket exploded shortly after take-off and the subsequent enquiry showed that this was due to a fault in the software in the inertial navigation system. behave correctly when being subjected to the count-down and flight time
of the floating point number to be converted must lie within a restricted these were just electrical integration tests and "low-level "
Error when converting the horizontal bias variable BH, and the lack of
contractual levels.There is no evidence that any trajectory data were used to analyse the
The only uncertainty concerned fulfilment
in which the Board's findings are documented in greater technical detail. However, no test was performed to verify that the SRI would
These
reasons for the failure and to make a contribution towards the improvement
possible or it is not possible to exercise them completely or in a representative
the launch site was negligible. additional anomalies which are being investigated but are not considered
after that time, it suddenly veered off its flight path, broke up, and
Engineers from the Ariane 5 project teams of CNES The Furthermore software is flexible
to the destruction of the vehicle and the failure of the mission. integers from -32768 to +32767 inclusive and assuming only that the function data in the SRI requirements and specification.Although the source of the Operand Error has been identified, this in
but since the purpose of a system simulation test is not only to verify
were found which were related to the failure, but in spite of the short
der Ariane 5", for Ariane 4. involves complex mathematical filter functions to properly align the x-axis
exposed.The main explanation for the absence of this test has already been mentioned
0000001475 00000 n
From
The Explosion of the Ariane 5 On June 4, 1996 an unmanned Ariane 5 rocket launched by the European Space Agency exploded just forty seconds after its lift-off from Kourou, French Guiana. Also the events are initiated in the launcher which take several hours to reset. tests it is clearly better to compromise on accuracy but achieve all other
In both cases a large part of the electronics and the
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