NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
SAFER backpack test. Astronaut Carl Meade seen testing the Simplified Aid for EVA Rescue (SAFER) system during Shuttle Mission STS-64. Behind Meade is the rear of the Shuttle, in the foreground is part of the payload bay. SAFER is a scaled-down version of the Manned Manoeuvring Unit (MMU) used in Shuttle space walks, and is intended to provide emergency free-flying mobility or a self-rescue capability to astronauts during extravehicular activity (EVA). SAFER clips around the normal life-support backpack, and is powered by 24 fixed nitrogen thrusters. The nitrogen supply may be replenished during an EVA. STS-64 flew on 9-20 September 1994.
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