Editing Extravehicular Mobility Unit (section)

==Suit components==
[[File:Emu spacesuit control module.jpg|right|thumb|200px| The E.M.U Display and Control Module (DCM).]]
The EMU, like the [[Apollo/Skylab A7L]] spacesuit, was the result of 21 years of research and development.<ref group=Note name=Note01/> It consists of a Space Suit Assembly (SSA) assembly which includes the [[Hard Upper Torso]] (HUT), arm sections, gloves, an Apollo-style "bubble" helmet, the Extravehicular Visor Assembly (EVVA), and a soft Lower Torso Assembly (LTA), incorporating the Body Seal Closure (BSC), waist bearing, brief, legs, and boots, and a Life Support System (LSS) which incorporates the [[Primary Life Support System]] (PLSS), electrical systems, and a Secondary Oxygen Pack (SOP).<ref>{{cite web | title = EMU Data Book | url = https://www.lpi.usra.edu/lunar/artemis/NASA-EMU-Data-Book-JSC-E-DAA-TN55224.pdf}}</ref>  Prior to donning the pressure garment, the crew member puts on a [[Maximum Absorbency Garment]] (MAG) (basically a modified [[urinary incontinence|incontinence]] diaper – Urine Collection Devices (UCDs) are no longer used), and possibly a Thermal Control Undergarment ([[long underwear|long johns]]). The final item donned before putting on the pressure suit is the [[Liquid Cooling and Ventilation Garment]] (LCVG), which incorporates clear plastic tubing through which chilled liquid [[water]] flows for body temperature control, as well as ventilation tubes for waste gas removal.

After donning the LCVG, the astronaut then puts on the LTA, before entering the airlock. The astronaut then dons the HUT, connects the LCVG umbilical to the umbilical in the HUT, and then locks the two parts of the suit together using the Body Seal Closure. Once the suit is turned on and checked out, the astronaut dons a "[[Snoopy cap]]", a brown and white fabric communications cap dating back to the [[Project Apollo|Apollo]] days, which incorporates a pair of earphones and microphones, allowing the EVA astronaut to communicate with both the crew members in the [[Space Shuttle orbiter|orbiter]] and ground controllers in [[Johnson Space Center|Houston]]. After donning the "Snoopy cap", the gloves and helmet are then locked on, pressurizing the suit. The suit's regulator and fans activate when the servicing umbilicals are removed and the suit reaches an internal pressure of {{convert|4.3|psi|kPa|abbr=on}}. A typical EMU can support an astronaut for 8.5 hours, including 30 minutes of reserves in the case of primary life support failure. To perform an EVA from the shuttle, the cabin pressure was reduced from {{convert|14.7|to|10.2|psi|kPa|abbr=on}} for 24 hours, after which an astronaut had to [[Decompression sickness#Exposure to altitude|pre-breathe]] for 45 minutes.<ref name=Foot01/> For EVAs on board the ISS, the astronaut must pre-breathe for about four hours,<ref name=Foot01/> although since 2006 most ISS EVAs have instead employed a "camp out" procedure where the spacewalk team sleeps in the [[Quest Joint Airlock|Quest airlock module]] while the atmosphere is adjusted.<ref>{{cite web | title = International Space Station Status Report #06-7 | url = http://spaceflight.nasa.gov/spacenews/reports/issreports/2006/iss06-7.html | archive-url = https://web.archive.org/web/20060615191754/http://spaceflight.nasa.gov/spacenews/reports/issreports/2006/iss06-7.html | url-status = dead | archive-date = 2006-06-15 | publisher = NASA|author=NASA|access-date=2006-02-17}}</ref>

[[File:Space suit patch.jpg|thumb|NASA's Extravehicular Mobility Unit ''[[Vitruvian Man|Vitruvian]] Spaceman'' patch ([[Space Shuttle]] version, with three stars representing NASA's [[human spaceflight programs]])]]