NASA tests Orion's fate during parachute failure scenario
What would happen to the astronaut crews aboard NASA's Orion deep space capsule in the event of parachute failures in the final moments before splashdown upon returning from weeks to years long forays to the Moon, Asteroids or Mars?
NASA teams are evaluating Orion's fate under multiple scenarios in case certain of the ships various parachute systems suffer partial deployment failures after the blistering high speed reentry into the Earth's atmosphere.
Orion is nominally outfitted with multiple different parachute systems including two drogue chutes and three main chutes that are essential for stabilizing and slowing the crewed spacecraft for safely landing in the Pacific Ocean upon concluding a NASA 'Journey to Mars' mission."
This week engineers from NASA and prime contractor Lockheed Martin ran a dramatic and successful six mile high altitude drop test in the skies over the Arizona desert, in the instance where one of the parachutes in each of Orion's drogue and main systems was intentionally set to fail.
"We test Orion's parachutes to the extremes to ensure we have a safe system for bringing crews back to Earth on future flights, even if something goes wrong," says CJ Johnson, project manager for Orion's parachute system, in a statement.
"Orion's parachute performance is difficult to model with computers, so putting them to the test in the air helps us better evaluate and predict how the system works."
Although Orion hits the atmosphere at over 24,000 mph after returning from deep space, it slows significantly after atmospheric reentry.
By the time the first parachutes normally deploy, the crew module has decelerated to some 300 mph. Their job is to slow the craft down to about 20 mph by the time of ocean splashdown mere minutes later.
On Aug. 26, NASA conducted a 35,000 foot high drop test out of the cargo bay of a C-17 aircraft using an engineering test version of the Orion capsule over the U.S. Army Yuma Proving Ground in Yuma, Arizona.
"The engineering model has a mass similar to that of the Orion capsule being developed for deep space missions, and similar interfaces with its parachute system," say officials.
"Engineers purposefully simulated a failure scenario in which one of the two drogue parachutes, used to slow and stabilize Orion at high altitude, and one of its three main parachutes, used to slow the crew module to landing speed, did not deploy."
Here's a video detailing the entire drop test sequence of events from preflight preparations to the parachute landing.
The high-risk Aug. 26 experiment was NASA's penultimate drop test in this engineering evaluations series. A new series of tests in 2016 will serve to qualify the parachute system for crewed flights.
Orion's inaugural mission dubbed Exploration Flight Test-1 (EFT) was successfully launched on a flawless flight on Dec. 5, 2014 atop a United Launch Alliance Delta IV Heavy rocket Space Launch Complex 37 (SLC-37) at Cape Canaveral Air Force Station in Florida.
The parachutes operated flawlessly during the Orion EFT-1 mission.
Orion's next launch is set for the uncrewed test flight called Exploration Mission-1 (EM-1). It will blast off on the inaugural flight of NASA's SLS heavy lift monster rocket concurrently under development – from Launch Complex 39-B at the Kennedy Space Center.
The maiden SLS test flight is targeted for no later than November 2018 and will be configured in its initial 70-metric-ton (77-ton) version with a liftoff thrust of 8.4 million pounds. It will boost an unmanned Orion on an approximately three week long test flight beyond the Moon and back.
Toward that goal, NASA is also currently testing the RS-25 first stage engines that will power SLS – as outlined in my recent story here.
NASA plans to gradually upgrade the SLS to achieve an unprecedented lift capability of 130 metric tons (143 tons), enabling the more distant missions even farther into our solar system.
Source: Universe Today