collectSPACE: Messages - Reply to Topic

Space News
space history and artifacts articles

Messages
space history discussion forums

Sightings
worldwide astronaut appearances

Resources
selected space history documents

Forum:	Space Shuttles - Space Station
Topic:	Commercial crew vehicle relocations at ISS

Want to register?

Who Can Post?	Any registered users may post a reply.
About Registration	You must be registered in order to post a topic or reply in this forum.
Your UserName:
Your Password:	Forget your password?
Your Reply: HTML is ON UBB Code is ON Smilies Legend	[QUOTE]Originally posted by MSS: [B]The SSRMS cannot reach into the trunk of the Cargo Dragon docked to the Forward port (PMA-2). So all Cargo Dragons must dock to Zenith (PMA-3). The first Crew-1 relocation will test all systems associated with this operation. This Crew-1 relocation is for Crew-2 to dock to PMA-2 (currently sets on April 23). That allows OFT2 (currently sets after Crew-1 returning sometime in May) and Cargo SpaceX-22 (currently sets on June 4) to dock to PMA-3. Relocation will be performed at the end of the Crew Dragon flight (similar to the Russian Soyuz). All relocation operations are planned in advance due to all operations on board the ISS and the exchange of ships with their cargoes.[/B][/QUOTE]
Options	Disable Smilies in This Post. Show Signature: include your profile signature. Only registered users may have signatures.
*If HTML and/or UBB Code are enabled, this means you can use HTML and/or UBB Code in your message.

If you have previously registered, but forgotten your password, click here.

<table border=0 cellpadding=0 cellspacing=0 width="600"><TR><td bgcolor="#000000"><TABLE BORDER=0 cellpadding=4 border=0 cellspacing=1 WIDTH="100%"><TR bgcolor="#660000"><TD COLSPAN=2><CENTER>T O P I C     R E V I E W</CENTER></TD></TR><TR bgcolor="#494949"><TD valign=top>MSS</TD><TD>There are two ports where commercial US capsules can dock with on the Harmony module at the International Space Station (ISS). So we start the list of such scheduled operations with whole crew on board of relocating capsules.The first relocation Crew-1 Resilience capsule from PMA-2/IDA-2 port (Forward) to PMA-3/IDA-3 port (Zenith) is scheduled on April 5, 2021. The main reason such operation is free docking port for future docking operation {time in GMT/UTC}: <UL TYPE=SQUARE><LI> Resilience (Crew-1)...April 5, 2021...38m30s...10:30:00-11:08:30...F to Z. <LI> Endeavour (Crew-2)...July 21, 2021...50m54s...10:44:59-11:35:53...F to Z. <LI> Endeavour (Crew-6)...May 6, 2023...38m00s...11:23:00-12:01:00...F to Z. </UL> The first post will be updated as more data will be available.</TD></TR><TR bgcolor="#333333"><TD valign=top>MSS</TD><TD>NASA video <BLOCKQUOTE>Expedition 64 inflight event with Discovery Channel on March 26, 2021, Victor Glover and Soichi Noguchi describe what is going to happen during the Crew Dragon relocation.</BLOCKQUOTE> <center><iframe width="400" height="225" src="https://www.youtube.com/embed/27S1EiS4G50?start=586" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen>

Apollo-Soyuz

Why the need for a relocation if there are two docking ports?

MSS

The SSRMS cannot reach into the trunk of the Cargo Dragon docked to the Forward port (PMA-2). So all Cargo Dragons must dock to Zenith (PMA-3).

The first Crew-1 relocation will test all systems associated with this operation.

This Crew-1 relocation is for Crew-2 to dock to PMA-2 (currently sets on April 23). That allows OFT2 (currently sets after Crew-1 returning sometime in May) and Cargo SpaceX-22 (currently sets on June 4) to dock to PMA-3.

Relocation will be performed at the end of the Crew Dragon flight (similar to the Russian Soyuz).

All relocation operations are planned in advance due to all operations on board the ISS and the exchange of ships with their cargoes.

Robsch

Is there a similar reason for relocating Soyuz and Progress?

MSS

Look at Soyuz spacecraft relocations at ISS.

In the history of the ISS, there were only four Progresses (M1-4 in 2001, M-15M in 2012, M-21M in 2014 and MS-1 in 2016) relocations to the same docking port as before the disconnection and except the last testing docking with a new craft lasted more days.

So there weren't a real relocation like Soyuz. I suspect that a reason was defferent then crewed Soyuz.

MSS

The first Crew Dragon relocation on ISS (April 5, 2021).

Before:
After:

Paul78zephyr

Could anyone explain why it was necessary for all four crew members to be aboard the Crew Dragon for the relocation considering it is a fully autonomous operation? Is this also the case when the Soyuz relocates (i.e. full crew)?

MSS

The principle of safety is the same for the Dragon as it is for the Soyuz. Safety considerations are decisive. There are currently seven people on the ISS: Soyuz has a capacity of three people and Dragon four people, so one cannot replace the other in a safe return to Earth.

Robert Pearlman

As Maciej (MSS) says, it is to protect against the scenario where the crew vehicle cannot redock with the space station.

If the Dragon (or Soyuz) cannot reconnect, then the crew members aboard would return to Earth, ensuring no one is left aboard the space station without a ride back home.

Paul78zephyr

Robert, thank you for clarifying - that makes perfect sense and I did not consider it.

MSS

The second Crew Dragon relocation on ISS (July 21, 2021).

Before:
After:

Contact Us | The Source for Space History & Artifacts