ISS - Międzynarodowa Stacja Kosmiczna (2017)

[astropl]

A czy coś wiadomo kiedy najbliższy spacer kosmiczny?

Wiadomo - w piątek

[mss]

Więcej w wątku z zestawieniem spacerów kosmicznych EMU/ISS.

Będzie to 200. spacer związany z budową i obsługą MSK. Kolejny, tym razem rosyjski spacer dopiero w połowie sierpnia 2017. Amerykański spacer nr 202 jest planowany na przełomie października i listopada tego roku.
Więcej o planach też w wątku o podanej wyżej nazwie.

[mss]

ISS Spacewalker Duo to Install External Avionics Package & HD Camera

Two astronauts aboard the International Space Station are gearing up for the 200th spacewalk in support of ISS Assembly and Maintenance set for Friday to install a new payload controller on the Station’s truss, diagnose degrading thermal control on the Station’s flagship astrophysics instrument, put in place an external HD camera and install a series of wireless communication antennas.

The Space Station’s first 199 spacewalks amassed a cumulative EVA time of 1,245 hours and spacewalkers Peggy Whitson and Jack Fischer plan to add another six and a half hours on Friday as part of U.S. EVA-42. Their primary task will be the installation of a payload controller on an external logistics carrier to prepare for the arrival of a new Earth-science instrument bench on the upcoming SpaceX Dragon mission, but the EVA also includes a series of smaller tasks to continue enhancing the Station’s external systems.

ISS spacewalks began in December 1998 when Jerry Ross and James Newman ventured out on three EVAs as part of the STS-88 mission that delivered the first U.S. building block of ISS to orbit – the Unity Module with two Pressurized Mating Adapters on either end. Their EVAs were dedicated to building the electrical/data bridge between the U.S. and Russian sides of the station.

Over the years, ISS EVAs became more complex, accomplishing major assembly steps such as the integration of the 109-meter long truss segment and dealing with urgent maintenance tasks like the replacement of failed components outside the safety of the pressurized modules. To date, the majority of ISS spacewalks were carried out by visiting Space Shuttle crews as the fast-paced nature of STS missions allowed crews to work a more challenging schedule for a few days, including back-to-back EVAs.

Since the Shuttle’s retirement, spacewalking operations transitioned to a more general training approach for ISS crews including rehearsals of EVAs dealing with major equipment failures. But different from the days of Shuttle, crews no longer train entire choreographed EVAs and often complete procedures without specific ground training at all. Friday’s EVA is slightly different from that as both spacewalkers were able to rehearse the central task of the EVA in the Neutral Buoyancy Laboratory prior to departing for ISS.

Friday’s spacewalk was originally planned to occur as part of a series of EVAs in late March and early April, but the delay of the Cygnus OA-7 cargo mission forced EVA-42 to be pushed from Expedition 50 to Expedition 51 because two critical parts for the spacewalk were launching on Cygnus, specifically the Express Carrier Avionics and the AMS-2 1553 Feedback Terminator.

Per the original plan, EVA-42 was to be performed by Peggy Whitson and ESA Astronaut Thomas Pesquet, however, with the slip into Expedition 51 it was decided to substitute Pesquet with NASA Astronaut Jack Fischer who arrived at ISS aboard Soyuz MS-04.

It is NASA’s desire to give as many astronauts as possible a hands-on EVA experience in orbit and Pesquet has already participated in a pair of EVAs earlier this year. Another factor in the decision was Fischer has more recent ground-based training experience for this specific EVA.

It will be the first excursion for Fischer, joined by EVA veteran Peggy Whitson who conducted her first ISS EVA back in 2002 and since accumulated eight career EVAs for a total of 53.5 hours. If Friday’s EVA runs the scheduled duration of 6.5 hours, Whitson will move up to third on the all-time list for career EVA time.

Preparations for EVA-42 began in late April with reconfigurations of Extravehicular Mobility Units #3006 and #3008 and preparations of tools. Whitson & Fischer – along with Pesquet who will handle robotic operations – went through a series of procedure reviews over the past several days and, on Tuesday, the spacewalkers conducted pressurized fit checks in their suits, also giving Fischer a chance to exercise his translation inside ISS before venturing outside.

Friday will begin bright and early for the crew, ingressing their space suits for checkouts and  two hours of pre-breathing and light exercise to remove nitrogen from their blood. They will then move into the Quest crew lock for a methodical depressurization ahead of opening the external hatch and the transition of their suits to battery power – marking the formal start of the EVA, currently planned for 12:00 UTC.

Egressing the Quest airlock, the crew will set up shop with the typical checks of their suits and tethers, and also move equipment needed for the EVA outside – wireless antenna assemblies will be temp-stowed at the airlock while Whitson will take control of the large ELC avionics box and Fischer carries a large ORU bag.

Peggy Whitson will make her way starboard to Express Logistics Carrier 4 (ELC-4) that is installed on the nadir-face of the S3 truss and will be the first worksite for Friday’s EVA.

The Space Station has four Express Logistics Carriers, delivered in 2009 and 2011 by three Shuttle missions and loaded with various spare parts, known as Orbital Replacement Units that were pre-positioned on ISS for use in the second half of the Station’s life after the Shuttle’s retirement.

Each 4.3 by 4.9 meters in size, the ELCs also provide accommodations for external payloads like Earth Science instruments and technology demonstration payloads. The main focus of Friday’s EVA will be on the ELC-4 ExPRESS carrier avionics (ExPCA) – a central component of the ELC that delivers electrical power and data connectivity to the experiments and spares installed on the ELC.

The ExPCA on ELC-4 is considered partially failed and needs to be replaced prior to the arrival of the Multi-User Earth System on the next Dragon mission that will host up to four Earth-pointed instruments in the future and requires a high-speed data link with ISS. The ExPCA hosts MIL-1553 command interfaces to control the various ELC payloads, hosts a fiber optical data bus to transmit high-rate science data to ISS, provides a LAN interface with the various experiments, and facilitates analog input and command channels.

The ExPCA is a relatively balky piece of hardware, residing on the forward-facing side of the ELC, in between a pair of scuff plates. A large number of blind-mate connectors forming the electrical / data interface reside on the back of the ExPCA, making its removal and replacement fairly straightforward without the need for extensive cabling work.

Setting up shop at the ELC-4 worksite, Whitson will prepare the ExPCA by installing a pair of scoops and breaking torque on a pair of structural bolts holding unit in place. She will also set up a Multi-Use Ball-Stack Tether (MUT) on the ELC-4 to act as temp-stow location for the ExPCA once removed. In the meantime, Fischer will prepare the robotic arm by installing a foot restraint and ingress the restraint to allow Thomas Pesquet to move him over to ELC-4 to assist with the ExPCA replacement using both of his hands.
ExPCA Installation (MBL Exercise) – Photo: NASA TV

When the old ExPCA is removed, it will be secured in its temp-stow location and the two spacewalkers will move zenith to S3 where Whitson will have secured the spare earlier in the EVA.

Whitson will release the spare and Fischer will take control of it via a pair of scoops or handles and guide Pesquet to move the arm back into a position on ELC-4 for installation of the ExPCA. Peggy Whitson will position herself to guide Fischer into position via a pair of pins on the receptacle on ELC-4. When the ExPCA is in position, Fischer will use the Pistol Grip Tool to secure the structural bolts to mark the completion of EVA’s first and most critical task.

The old ExPCA will be removed from the MUT and placed on S3 so that Whitson can retrieve it on her trip inboard to the airlock later in the EVA.

Afterwards, the two crew members will part ways – Whitson will be headed zenith to AMS-2 while Fischer remains on the arm for the HD Camera installation task. At this point, a task may be inserted for either crew member to photograph the 3B solar array wing where a tear was recently found in one of the array hinges, spanning around 15 centimeters in length. Assessments by Mission Control have been ongoing since early May and additional footage is desired to assess whether the tear could become a concern in the future.

Heading up and around the S3 truss segment, Whitson will reach the Alpha Magnetic Spectrometer 2, the Space Station’s prime astrophysics payload tasked with exploring the high-energy universe. At one of the AMS connector panels, Whitson will install a 1553 Feedback Terminator Cap which will essentially act as a line tester – allowing Mission Control to assess whether this particular 1553 line is still functional and would be available for providing commands/data to a future addition to AMS-2.

więcej: http://spaceflight101.com/expedition-51/us-eva-42-preview/

[kanarkusmaximus]

Czy trwa spacer kosmiczny? Przepraszam, dziś cały dzień miałem spotkanie (będzie o tym na kosmonaucie!) i nie mogłem obserwować poczynań na Stacji.

[mss]

Evka 42 została skrócona i trwała tylko 4 godziny i 13 minut!

[JSz]

Bo tak dobrze im poszło, czy tak źle?

[mss]

Były początkowo problemy z skafandrami i ich oprzyrządowaniem, więc rozpoczął się spacer z opóźnieniem i zakres prac został ograniczony, jednak postęp prac był bardzo sprawny i wykonano wszystko za wyjątkiem 2 zadań: instalacja kamery HDTV i anten sieci komunikacynej zostały przełożone na przyszłe spacery.

[mss]

200 spacerów od 7.12.1998 do dzisiaj trwało łącznie 1247 godzin i 55 minut (bez 5 minut 52 dni).

Był to 5 spacer w tym roku. Uczestnicy w załączniku.

[Slavin]

200 spacer na MSK 

[Orionid]

Dwusetny spacer kosmiczny na ISS
BY KRZYSZTOF KANAWKA ON 14 MAJA 2017

(...) Był to dwusetny spacer kosmiczny związany z ISS. Numeracja EVA-42 może tu być nieco myląca, jednak warto zauważyć, że większość amerykańskich spacerów wykonano podczas misji promów kosmicznych i te spacery otrzymały inną numerację. Ponadto, rosyjskie spacery mają także inną numerację: rosyjska EVA-42 odbyła się w lutym 2016 roku.

http://kosmonauta.net/2017/05/dwusetny-spacer-kosmiczny-na-iss/

[kanarkusmaximus]

No to zadam pytania dwa:
- co nie tak z jednym ze skafandrów? Będzie go można bezpiecznie ponownie użyć?
- kiedy kolejny spacer?

Niestety, to był pierwszy spacer od dawna, którego w ogóle nie widziałem. Skandal!

[mss]

z http://www.americaspace.com/2017/05/12/whitsonpesquet-stand-on-shoulders-of-titans-for-historic-200th-iss-spacewalk/

However, it was at this juncture that U.S. EVA-42’s first major issue arose. Ordinarily, the astronauts’ suits receive electricity, cooling and communications via Service and Cooling Umbilicals (SCUs) during the pre-breathing period. Unfortunately, the SCU connected to Fischer’s suit experienced a small water leak, requiring the pair to share the other SCU. NASA stressed that the leak was in the SCU, and not in Fischer’s suit, but the sharing process caused an additional draw in battery power on the EMUs. This limited the battery power available for use during the spacewalk itself and U.S. EVA-42 was accordingly reduced in duration from 6.5 hours to around four hours.

z http://www.cbsnews.com/news/station-spacewalk-shortened-after-airlock-problems/

The astronauts originally planned to spend six-and-a-half hours outside the station, but the crew ran into problems when a small water leak was found where an airlock power-and-cooling umbilical attached to Fischer's spacesuit.

The airlock is equipped with two such umbilicals to provide cooling water, power and data while the astronauts are inside the station, preserving the suits' batteries for the actual EVA.

With one umbilical out of action, Whitson and Fischer had to share the remaining power and cooling line, swapping it back and forth periodically. But that meant each astronaut, in turn, had to rely on suit battery power when the umbilical was not attached.

Playing it safe, flight controllers at the Johnson Space Center decided to shorten the spacewalk to four hours and to eliminate all tasks other than the highest priority item, replacement of a 200-pound avionics box on an external logistics platform.

Intl. Space Station @Space_Station
@AstroPeggy is the fifth place all-time record holder in cumulative spacewalk time after completing her ninth spacewalk on Friday.

Kolejny, 201. tym razem rosyjski spacer dopiero w połowie sierpnia 2017. Amerykański spacer nr 202 jest planowany na przełomie października i listopada tego roku.

[mss]

Pojawiło się doniesienie, że rosyjski spacer (ВКД-43) jest obecnie zaplanowany na 17.08.2017.

[mss]

Pojawiły się także dane co do godzin startów i lądowań rosyjskich statków do końca 2017:

Oto one (czasy w UTC):
Progress МS-06 14.06.2017 09:20
Sojuz MS-05 28.07.2017 15:41
Sojuz МS-06 12.09.2017 21:17
Progress МS-07 12.10.2017 09:35
Sojuz МS-07 27.12.2017 03:22

Lądowania statków:
Sojuz МS-03 02.06.2017 14:09
Sojuz МS-04 03.09.2017 01:25
Sojuz МS-05 14.12.2017 08:36

[mss]

Aktualne zestawienie spacerów kosmicznych związanych z MSK/ISS 200:
151 w amerykańskich skafandrach EMU i 49 w rosyjskich skafandrach Orłan: