Presented the final report on the failure of the Soyuz MS-10

Presented the final report on the failure of the Soyuz MS-10 https://i1.wp.com/www.eresviral.com/wp-content/uploads/2018/11/1541187866_Presentado-el-informe-final-sobre-el-fallo-de-la-Soyuz-MS-10.png?fit=260%2C140&ssl=1

Presented the final report on the failure of the Soyuz MS-10







We already know the causes of the failure of the pitcher that prevented the Soyuz MS-10 reach the orbit. The commission created for this purpose has published its conclusions on November 1 and, as expected, there are no surprises. The incident occurred because one of the four side blocks of the first stage of the Soyuz-FG did not separate as planned due to a faulty sensor that had been damaged during the assembly of the rocket in Baikonur. The block hit the central stage of the Soyuz, diverting the launcher from its trajectory. The prompt and effective activation of the SAS emergency system saved the life of the crew. On this occasion the Soyuz-FG had a camera mounted outside the second stage or central stage (Block A), so we could see directly what happened in this mission. The following image leaves no doubt:



Image of the "rocketcam" of the Soyuz-FG in which the separation of two of the four blocks of the first stage is appreciated while the block on the left (Block D) is still attached at the end to Block A (Roscosmos)



On October 11, 2018 at 08:40 UTC the Soyuz-FG rocket with the serial number U15000-062 took off without problems from the Gagarin Ramp (PU-5) of the Baikonur cosmodrome with the Soyuz MS-10. On board were cosmonauts Alexéi Ovchinin (Roscosmos) and Nick Hague (NASA). The launch went smoothly and 114.16 seconds after takeoff, the exhaust system of the SAS system came off. At 118 seconds three of the four lateral blocks of the first stage were correctly separated (Blocks B, V and G), but Block D remained joined by the upper end.



Phases of the launch of the Soyuz MS-10 and activation of the SAS (Roscosmos).



The side blocks or bokovushki they are joined in their lower part by metal fasteners that are separated by pyrotechnic mechanisms, while in the upper part they are joined to Block A by a mechanical mechanism consisting of a metallic ball that is inserted into a hole as if it were a joint. When the lower part separates from the launcher, a sensor in the ball detects the movement of the joint and activates a pyrotechnic mechanism located in the valve of the liquid oxygen tank of the lateral block. The gas that escapes through the valve helps to separate the block from the top. In this launch the sensor of the ball of Block D was damaged during the assembly of the rocket in the MIK-112 building of Baikonur and, as a result, it folded about 6.5 °. The commission is certain that the failure occurred in Baikonur and not in the facilities of RKTs Progress in Samara, where the rocket is integrated before being sent by rail to Baikonur disassembled. When the oxygen tank valve was not activated, Block D bounced and hit the central A block at the bottom, drilling the kerosene tank and causing a strong deviation in the Soyuz-FG trajectory.



Head of Block D of the Soyuz MS-10 mission where the deformation of the sensor (the "pin" at the top) can be seen. The other two cylinders are stops to make sure that the block comes off in the corresponding plane (Roscosmos).





Detail of the end of a side block of a Soyuz rocket. The red circle corresponds to the oxygen tank valve (Novosti Kosmonavtiki).





Rogozin inspects the ball at the end of a side block at the RKTs Progress factory in Samara (Roscosmos).





Detail of the end of a side block where the pin of the sensor that was damaged in the mission of the Soyuz MS-10 (Novosti Kosmonavtiki) can be seen.



In view of the incorrect separation of Block D, the computer sent the order to shut down engine RD-108A of Block A 121.57 seconds after takeoff. The SAS system proved that Block A was unable to stabilize its trajectory and the four solid fuel RDG motors of the SAS located in the cap were activated 0.05 seconds after the command to shut off the central stage motor was issued, that is, about 122 seconds after takeoff (first two RDGs were activated and, 0.24 seconds later, the other two). The capsule (SA) of the Soyuz MS-10 with the cosmonauts was separated from the cap and the orbital module (BO) 37.18 seconds after the activation of the SAS. The pod reached a peak of 93 kilometers before re-descending and landed 19 minutes and 41 seconds (1,189 seconds) after takeoff with the crew safe and sound. The landing site was 32 kilometers southeast of the Kazakh city of Zhezkazgan (47 ° 35 '08 "north latitude, 68 ° 00' 25" east longitude).



Zone of fall of the different elements of the rocket and the ship Soyuz MS-10 (Roscosmos).





Sequence of action of the rescue teams. In the photo Ovchinin and Hague are seen outside the capsule thanking the SAS for being alive (Roscosmos).



The rescue team mobilized immediately as soon as the emergency was declared. At 08:42:17 UTC the signal "avaria" (fault) was activated on the crew panel and at 08:50 UTC an Antonov An-12 plane took off from the Zhezkazgan airport with paratroopers. The two cosmonauts activated the emergency beacon of the COSPAS-SARSAT system at 09:02 UTC. At 09:08 UTC the crew of the An-12 was able to communicate by radio with the cosmonauts and three minutes later visually located the capsule. The paratroopers jumped from An-12 at 09:15 UTC to attend to the crew. The cosmonauts were evacuated from the capsule between 09:35 and 09:40. At 08:48 UTC two Mil Mi-8 helicopters took off from the Krainy airport in Baikonur with specialists and medical personnel who arrived at the landing site at 10:38 UTC. After a preliminary medical examination, the two crewmen mounted the Thousand Mi-8 at 10:58 UTC and set off for the Zhezkazgan airport, where they arrived at 11:08 UTC. The head of Roscosmos Dmitri Rogozin awaited them there. Later, the two cosmonauts left by plane for the Krainy airport to meet again with their relatives and the staff of Roscosmos and NASA, including the administrator of the US space agency, Jim Bridenstine.



Means of rescue used in the launch of the Soyuz MS-10 (Roscosmos).



The capsule was collected by two PEM amphibious vehicles at 14:00 UTC and would be transferred to Moscow the next day aboard an Antonov An-12 that departed from Zhezkazgan. As part of the normal rescue device during a launch, twelve airplanes were mobilized (of the types An-12, An-2, An-30, An-26 and Tu-142), fourteen thousand Mi-8 helicopters and one ship (the Alatau) in the sea of ​​Japan. The commission has used in its investigation the remains of the rocket found in the Kazakh steppe (Block D appeared further north than the rest). On October 25, a Soyuz-1.1b rocket took off from Plesetsk with the Kosmos 2528 military satellite and everything went perfectly. In the next few days another Soyuz-2.1b will take off from Plesetsk with a GLONASS and on November 18 the Progress MS-10 cargo ship will depart from Baikonur using a Soyuz-FG. If all these launches go smoothly, on December 3 Soyuz MS-11 will take off with another Soyuz-FG with Oleg Kononenko, David Saint-Jacques and Anne McClain. Next August the Soyuz MS-14 will be the first manned Soyuz to take off using a Soyuz-2.1a, vector that must replace the Soyuz-FG. Ovchinin and Hague will return to active service, but they have not yet decided on which mission they will travel.



Takeoff of a Soyuz-2.1b from Plesetsk on October 25 (Roscosmos).



Although evidently we are facing a quality control problem, Roscosmos concludes that the accident was the result of a single failure and that there is no possibility of repeating now that additional checks have been introduced in the assembly of the Soyuz in Samara and in Baikonur. It is true that both NASA and Roscosmos want to shelve the issue as soon as possible and continue with the manned missions to the ISS, because nobody wants to leave the station without a crew (although technically possible, it is not desirable). Watching the video of the launch - by the way, it is the first time that we can contemplate a takeoff from the mythical Gagarin's Ramp - it is evident the seriousness of the incident and how quickly everything happened. Surely after seeing the images Ovchinin and Hague are even more grateful to the SAS if possible.

[youtube https://www.youtube.com/watch?v=CrzlMTRVt_I?feature=oembed&w=500&h=281]

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