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Are there any plans for handling people floating away during an EVA?

Has there been any program to develop tiny pod-like vehicles with manipulator arms for extra-vehicular activities?Were there any spacecraft not configured for a spacewalk?Are there any rocket engines in current or former use that aren’t normally restarted in flight, but have the capability for an emergency restart?

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15

$begingroup$

An EVA carries the risk that objects and people may become detached from the ship/structure and drift away from it. In the case of objects they might become a hazard or their loss might be a problem, but in the case of people it could be fatal.

I'm aware of NASA's EMU. For the purposes of this question it would have to be broken or out of propellant. Emergency devices that are not used in the normal course of an EVA are relevant though.

Has any space agency made plans for dealing with such an event?

eva emergency

share|improve this question

edited 2 days ago

a CVn

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useruser

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$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  There's always the space harpoon...
  $endgroup$
  – JCRM
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  8
  

  
  
  
  
  
  

  
  $begingroup$
  Re For the purposes of this question it would have to be broken or out of propellant. That's at least four failures deep. An astronaut becoming detached during an EVA in and of itself is at least two failures deep. And now you have an additional two failures on top of that. NASA doesn't and can not plan for that many bad things happening in a row.
  $endgroup$
  – David Hammen
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The proedure is to sing a song from Frozen
  $endgroup$
  – Strawberry
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I thought the standard procedure is to use a fire extinguisher ;-).
  $endgroup$
  – Peter A. Schneider
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  As a desperate last resort, the astronaut could throw away everything not immediately essential to life support, in the opposite direction of the ship/structure, as hard as they can. These objects would push them back as per Newton's Third Law. Accuracy is very hard even if the force is strong enough. It's not impossible to work.
  $endgroup$
  – Emilio M Bumachar
  yesterday
  

  
  
  
  

add a comment | 

15

$begingroup$

An EVA carries the risk that objects and people may become detached from the ship/structure and drift away from it. In the case of objects they might become a hazard or their loss might be a problem, but in the case of people it could be fatal.

I'm aware of NASA's EMU. For the purposes of this question it would have to be broken or out of propellant. Emergency devices that are not used in the normal course of an EVA are relevant though.

Has any space agency made plans for dealing with such an event?

eva emergency

share|improve this question

edited 2 days ago

a CVn

4,94822 gold badges3232 silver badges7272 bronze badges

asked 2 days ago

useruser

67611 gold badge22 silver badges1313 bronze badges

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  There's always the space harpoon...
  $endgroup$
  – JCRM
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  8
  

  
  
  
  
  
  

  
  $begingroup$
  Re For the purposes of this question it would have to be broken or out of propellant. That's at least four failures deep. An astronaut becoming detached during an EVA in and of itself is at least two failures deep. And now you have an additional two failures on top of that. NASA doesn't and can not plan for that many bad things happening in a row.
  $endgroup$
  – David Hammen
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The proedure is to sing a song from Frozen
  $endgroup$
  – Strawberry
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I thought the standard procedure is to use a fire extinguisher ;-).
  $endgroup$
  – Peter A. Schneider
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  As a desperate last resort, the astronaut could throw away everything not immediately essential to life support, in the opposite direction of the ship/structure, as hard as they can. These objects would push them back as per Newton's Third Law. Accuracy is very hard even if the force is strong enough. It's not impossible to work.
  $endgroup$
  – Emilio M Bumachar
  yesterday
  

  
  
  
  

add a comment | 

$begingroup$

An EVA carries the risk that objects and people may become detached from the ship/structure and drift away from it. In the case of objects they might become a hazard or their loss might be a problem, but in the case of people it could be fatal.

I'm aware of NASA's EMU. For the purposes of this question it would have to be broken or out of propellant. Emergency devices that are not used in the normal course of an EVA are relevant though.

Has any space agency made plans for dealing with such an event?

eva emergency

share|improve this question

edited 2 days ago

a CVn

4,94822 gold badges3232 silver badges7272 bronze badges

asked 2 days ago

useruser

67611 gold badge22 silver badges1313 bronze badges

$endgroup$

share|improve this question

edited 2 days ago

a CVn

4,94822 gold badges3232 silver badges7272 bronze badges

asked 2 days ago

useruser

67611 gold badge22 silver badges1313 bronze badges

share|improve this question

edited 2 days ago

a CVn

4,94822 gold badges3232 silver badges7272 bronze badges

asked 2 days ago

useruser

67611 gold badge22 silver badges1313 bronze badges

edited 2 days ago

a CVn

4,94822 gold badges3232 silver badges7272 bronze badges

edited 2 days ago

a CVn

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asked 2 days ago

useruser

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asked 2 days ago

useruser

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1 Answer
1

active

oldest

votes

28

$begingroup$

A nitrogen cold jet thruster system called SAFER (Simplified Aid For EVA Rescue) is part of the US EVA suit ensemble. If a crewperson gets loose they can fly back using SAFER.

(Image source)

SAFER is not used in the normal course of an EVA. There is no other propulsive system on a US EVA suit.

SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson.

This photograph shows SAFER being tested for the first time on shuttle mission STS-64.

(Image source)

The system is flown by the use of a single hand controller instead of the usual one translational / one rotational hand controller scheme. The user selects between rotational and translational modes via a switch on the hand controller module. However, the controller has four degrees of freedom in either mode, with pitch commands being available in translational mode, and X translation being available in rotational mode. An attitude hold mode is available to automatically stop undesired rotations.

(Image source)

Procedures for the use of SAFER are found in the ISS EVA Checklist.

Acronymology

• EV ExtraVehicular


• GCA Ground Controlled Approach


• HCM Hand Controller Module


• IV IntraVehicular


• WVS Wireless Vision System

Additional detailed information about the SAFER system is available here.

share|improve this answer

edited 2 days ago

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  If no gas flow / BRN TRSRS
  $endgroup$
  – Richard
  2 days ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  "SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson." - so I guess the standard procedure in the "normal" situation is to chase them down with a soyuz? Is it even capable of being used for that?
  $endgroup$
  – Nathan Cooper
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @NathanCooper what? The standard procedure is self rescue with SAFER.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @Cris that's a troubleshooting step. If gas is not flowing, check that the supply valve is open.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @PeterSchneider before the ISS era the shuttle would fly after a loose crewperson. I haven't the foggiest idea about the Russian's plans.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  

 | 
show 4 more comments

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28

$begingroup$

A nitrogen cold jet thruster system called SAFER (Simplified Aid For EVA Rescue) is part of the US EVA suit ensemble. If a crewperson gets loose they can fly back using SAFER.

(Image source)

SAFER is not used in the normal course of an EVA. There is no other propulsive system on a US EVA suit.

SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson.

This photograph shows SAFER being tested for the first time on shuttle mission STS-64.

(Image source)

The system is flown by the use of a single hand controller instead of the usual one translational / one rotational hand controller scheme. The user selects between rotational and translational modes via a switch on the hand controller module. However, the controller has four degrees of freedom in either mode, with pitch commands being available in translational mode, and X translation being available in rotational mode. An attitude hold mode is available to automatically stop undesired rotations.

(Image source)

Procedures for the use of SAFER are found in the ISS EVA Checklist.

Acronymology

• EV ExtraVehicular


• GCA Ground Controlled Approach


• HCM Hand Controller Module


• IV IntraVehicular


• WVS Wireless Vision System

Additional detailed information about the SAFER system is available here.

share|improve this answer

edited 2 days ago

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  If no gas flow / BRN TRSRS
  $endgroup$
  – Richard
  2 days ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  "SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson." - so I guess the standard procedure in the "normal" situation is to chase them down with a soyuz? Is it even capable of being used for that?
  $endgroup$
  – Nathan Cooper
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @NathanCooper what? The standard procedure is self rescue with SAFER.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @Cris that's a troubleshooting step. If gas is not flowing, check that the supply valve is open.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @PeterSchneider before the ISS era the shuttle would fly after a loose crewperson. I haven't the foggiest idea about the Russian's plans.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  

 | 
show 4 more comments

28

$begingroup$

A nitrogen cold jet thruster system called SAFER (Simplified Aid For EVA Rescue) is part of the US EVA suit ensemble. If a crewperson gets loose they can fly back using SAFER.

(Image source)

SAFER is not used in the normal course of an EVA. There is no other propulsive system on a US EVA suit.

SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson.

This photograph shows SAFER being tested for the first time on shuttle mission STS-64.

(Image source)

The system is flown by the use of a single hand controller instead of the usual one translational / one rotational hand controller scheme. The user selects between rotational and translational modes via a switch on the hand controller module. However, the controller has four degrees of freedom in either mode, with pitch commands being available in translational mode, and X translation being available in rotational mode. An attitude hold mode is available to automatically stop undesired rotations.

(Image source)

Procedures for the use of SAFER are found in the ISS EVA Checklist.

Acronymology

• EV ExtraVehicular


• GCA Ground Controlled Approach


• HCM Hand Controller Module


• IV IntraVehicular


• WVS Wireless Vision System

Additional detailed information about the SAFER system is available here.

share|improve this answer

edited 2 days ago

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  If no gas flow / BRN TRSRS
  $endgroup$
  – Richard
  2 days ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  "SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson." - so I guess the standard procedure in the "normal" situation is to chase them down with a soyuz? Is it even capable of being used for that?
  $endgroup$
  – Nathan Cooper
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @NathanCooper what? The standard procedure is self rescue with SAFER.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @Cris that's a troubleshooting step. If gas is not flowing, check that the supply valve is open.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @PeterSchneider before the ISS era the shuttle would fly after a loose crewperson. I haven't the foggiest idea about the Russian's plans.
  $endgroup$
  – Organic Marble
  yesterday
  

  
  
  
  

 | 
show 4 more comments

$begingroup$

A nitrogen cold jet thruster system called SAFER (Simplified Aid For EVA Rescue) is part of the US EVA suit ensemble. If a crewperson gets loose they can fly back using SAFER.

(Image source)

SAFER is not used in the normal course of an EVA. There is no other propulsive system on a US EVA suit.

SAFER was deemed necessary for the ISS era because either the Shuttle would not be present at the ISS during the EVA, or even if present, would take considerable time to undock and prepare to chase down the free-floating crewperson.

This photograph shows SAFER being tested for the first time on shuttle mission STS-64.

(Image source)

The system is flown by the use of a single hand controller instead of the usual one translational / one rotational hand controller scheme. The user selects between rotational and translational modes via a switch on the hand controller module. However, the controller has four degrees of freedom in either mode, with pitch commands being available in translational mode, and X translation being available in rotational mode. An attitude hold mode is available to automatically stop undesired rotations.

(Image source)

Procedures for the use of SAFER are found in the ISS EVA Checklist.

Acronymology

• EV ExtraVehicular


• GCA Ground Controlled Approach


• HCM Hand Controller Module


• IV IntraVehicular


• WVS Wireless Vision System

Additional detailed information about the SAFER system is available here.

share|improve this answer

edited 2 days ago

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges

$endgroup$

share|improve this answer

edited 2 days ago

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges

answered 2 days ago

Organic MarbleOrganic Marble

76k44 gold badges229229 silver badges328328 bronze badges