Expedition 41 US EVA 27 Spacewalk

On Oct 7, 2014 NASA astronaut Reid Wiseman and European Space Agency Alexander Gerst from Germany, successfully completed a 6 hour maintenance spacewalk originally planned for a repair last December.
The main task involved removing a failed ammonia Pump Module from the MBS POA and placing it on the ESP-2 pallet.
Other tasks involved replacing the broken TV camera light #13 on the exterior of Destiny Lab module and the installation of a backup payload power system on the Mobile Transporter.

This pump module failed last December of 2013 and was replaced during 2 spacewalks later that month. But the repair crew did not have time to move the failed pump back to ESP-2.
For the US EVA 27, Astronaut Wiseman was EV-1 (red stripes) and Gerst was EV-2 (no stripes).

For this blog presentation, I have included for the first time, astronaut paper models in 1:100 scale to match the ISS model. The size of these astronaut models is compared to a man’s height of 1.81 mt (5 ft 11 in) tall.
Source was obtained from Spaceflight101.com and Spaceflightnow.com
This post is not intended to cover in detail the entire spacewalk, but it’s only a brief narrative of the important events.

The EVA started when both astronauts exited the Quest Airlock and started heading to their working areas. EV-1 headed to the ESP-2 and prepared the MLI cover for the failed Pump Module, while Gerst (EV-2) headed accross the station’s truss towards the Port CETA cart where he retrieved an Articulating Portable Foot Restraint.

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Alexander Gerst installed the foot restraint to the Space Station Robotic Arm System (Canadarm 2) and traveled towards the failed Pump Module located on the Mobile Transporter.

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The following photos show in detail the Mobile Transporter with the POA holding the failed Pump Module via the adjustable grapple fixture.

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Gerst is shown here riding the SSRMS and approaching the failed Pump Module.

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Once the pump module was grabbed, then Gerst was moved to the ESP-2 location where Astronaut Wiseman was waiting to assist him with the Pump Module installation.
Here is shown how the Pump Module is being tucked inside its thermal blanket. Half way in, the astronauts removed the Adjustable grapple fixture and putting it back to the ESP-2.

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This is after the Pump Module was finally installed inside its thermal blanket. This is the current configuration for ESP-2.

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Moving on, Gerst picked up a bag containing the spare CP13 light for the next task and headed to the starboard side of Destiny module to replace the failed camera light.

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For the next task, Wiseman translated to the zenith side of the Mobile Transporter to get started with the installation of the MTRA. This is the Mobile Transporter Relay Assembly, essentially a power box that has 4 cables to deliver backup power to the Mobile Transporter system should it get stranded in between work sites.

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The small white box shown here is the MTRA finally installed.

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Close up views of the MTRA on the Mobile Transporter.

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All the main tasks are completed.

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The Astronaut models:
I decided making simple 2D astronaut figures in different positions relevant to this EVA. Although not shown on the previous photos, but the final product of the astronaut models will have the respective American flag and German flag as well. Alexander Gerst became the first German to perform a spacewalk, and this model is a tribute to his accomplishment.
There is also an astronaut figure standing on a foot restraint. This piece is inserted via a small cylinder into one end of the SSRMS. Scotch tape was used to fix the astronaut models to the ISS model.

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The US EVA-27 kit is now available for free at this blogsite. The astronauts models will enhance your ISS model. Get it now!

Expedition 41 US EVA-27 kit

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