Ahead, another Roscosmos lawsuit against Dauria Aerospace emerges, in which Dauria will defend the position of serviceability of its vehicles that have passed pre-flight tests and argue for force majeure circumstances - during the separation of your spacecraft, or during communication with them , or in the course of further activities, you have identified any deviations from the norm in their work. ”
we assume that “Mayak” and other failed satellites, put into orbit with an approximate apogee of 600 km, failed because of the decomposition products of hydrazine from one or several liquid thrusters (LRE MT) C5.221.00-0 used in the reactive control system of the upper stage (RB) “Fregat”.
In the conclusion of the state commission to investigate the emergency situation with the ICA-N (a copy of the document is available from Izvestia), it is noted that the possible reason for the lack of communication with the satellites is the impact on the devices of “external factors”. At the same time, as indicated in the document, “a note was made on the functioning of the engine of the launch support system” of the upper unit “Frigate”. This unit was used to remove the payload on the required orbits after separation from the third stage of the Soyuz-2.1a rocket.
Judging by the telemetry transmitted to Earth, at the time of the separation of the nanosatellites and the Russian unit Mayak from the Frigate, fuel continued to flow into one of the engines of the upper stage. This engine was in close proximity to the MCA-N. Nevertheless, the state commission did not see a causal connection between this emergency situation and the subsequent lack of communication with nanosatellites. In conclusion, it is recognized that it is impossible to determine the source of "external factors" that led to the breakdown of MCA-N.
Having considered the reporting materials and having studied the technical data, including the telemetry of the Fregat upper stage, Glavkosmos concluded that the creation of an emergency commission was not practical due to the fact that the emergency situation was not fixed.
The separation of spacecraft MKA-N No. 1 and No. 2 and a number of other satellites (including Corvus-BC) in accordance with the cyclogram took place in the period of time (9180-9590 s) until the moment when the engine failure DT7 was detected (11440 s).
With the stated speed of the separation of the MCA-N declared by Dauria Aerospace, the distance to the Fregat upper stage during this time was more than 1.5 kilometers
Glavkosmos sent a request to the insurance company Starr Aviation and the customer company Astro Digital in order to obtain explanations on what grounds the insurance payment was made for Landmapper satellites, since the launch of the Soyuz-2 launch vehicle was officially recognized as successful, a representative of the state corporation told RIA Novosti "Roscosmos".
RIA Novosti ria.ru/space/20180316/1516541481.html
In short: Roscosmos is lying. And with each new press release, new tales are added.
Glavkosmos JSC considers the statements of the creators of the spacecraft Mayak claiming that the satellite stopped working due to external influence, a representative of the company acting as a subsidiary of the Roscosmos state corporation told RIA Novosti.
RIA Novosti ria.ru/space/20180316/1516543069.html
March 19th / TASS /. Malfunction in the engine of the upper unit “Frigate” occurred even before the separation of the spacecraft MKA-N manufactured by Dauria Aerospace, and not after, as Roscosmos claims. This was announced on Monday TASS spokesman for Dauria Aerospace Vitaly Egorov.
More on TASS:
tass.ru/kosmos/5045039
21 March
“According to the report of the S. A. Lavochkin NPO, which was drawn up by specialists from the Keldysh Center, Khimmash Design Bureau and the Russian Ministry of Defense, the research made it possible to reliably exclude the possibility of influence of leakage of propellant components on the spacecraft engine engine, and after. This did not affect and could not affect the process of launching the spacecraft, ”said the Russian Space Agency.
Source: https://habr.com/ru/post/411051/
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