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  Discarding Apollo PLSS backpacks post-EVA

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Author Topic:   Discarding Apollo PLSS backpacks post-EVA
KurtM
New Member

Posts: 3
From: League City, Texas USA
Registered: Sep 2019

posted 09-27-2024 08:31 AM     Click Here to See the Profile for KurtM   Click Here to Email KurtM     Edit/Delete Message   Reply w/Quote
I've been less than perfectly clear on the process of getting the Apollo PLSS (Portable Life Support System) backpacks discarded and left behind on the lunar surface, and assume it must've gone something like this:
  1. Astronauts ingress LM after final EVA, pressurize, have a rest period;

  2. Connect LM life support hoses to repress pressure suits before depressing the LM and kicking or shoving PLSS units and whatever else they wished to leave behind out the opened hatch;

  3. Close hatch, repress LM, and bon voyage
Also assume Lunar Module (LM)-Command and Service Module (CSM) rendezvous was performed with both LM cabin and pressure suits pressurized?

How'd I do? Thanks.

Mschul
New Member

Posts: 2
From: Orlando, FL, USA
Registered: Nov 2024

posted 11-17-2024 09:09 PM     Click Here to See the Profile for Mschul   Click Here to Email Mschul     Edit/Delete Message   Reply w/Quote
I'd say you've got it exactly right, Kurt.

You probably know that they kept the OPS's (oxygen purge system), the top part of each backpack. If for some reason the LM couldn't get a "hard dock" with the CSM, the OPS is what would supply oxygen during a spacewalk from the LM to the CSM.

The equipment jettison is on page 207 of the Apollo 11 Flight Plan.

The equipment jettison actually happened two hours early on Apollo 11 (114:05), I assume because the crew managed to convince Mission Control to start the EVA early.

onesmallstep
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Posts: 1488
From: Staten Island, New York USA
Registered: Nov 2007

posted 11-18-2024 08:39 AM     Click Here to See the Profile for onesmallstep   Click Here to Email onesmallstep     Edit/Delete Message   Reply w/Quote
The OPS and helmet LEVA from the commander (w/red stripes) were used by the CMPs on Apollos 15 through 17 for their EVAs to retrieve film from the service module SIM bays on the return to Earth.

All times are CT (US)

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