[meteorite-list] Genesis Crash Inquiry Helps Stardust Return

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Wed Dec 28 13:48:22 2005
Message-ID: <200512281846.jBSIkkk03072_at_zagami.jpl.nasa.gov>

http://space.com/missionlaunches/051228_genesis_stardust.html

Genesis Crash Inquiry Helps Stardust Return
By Leonard David
space.com
28 December 2005

Back in 2004, when NASA's Genesis return sample capsule tumbled from the
sky and slammed into the Utah desert, scientists quite literally had to
pick up the pieces of the mission.

Delicate wafers holding precious samples of atoms and ions from puffs of
solar wind that Genesis accumulated while lingering at Lagrange Point
1 - an area in space between Earth and the Sun - were shattered to bits.

Since the crash landing, researchers have been hard at work pulling
science data from the fragments - but it's a far tougher task than
originally planned when the $260 million Genesis mission lifted off in
August of 2001.

Soon-to-be released findings from a study of the Genesis mishap have
brought to light several "lessons learned" - action items that NASA's next
sample return mission team for Stardust are embracing for that capsule's
upcoming January 15th Utah landing.

The $212 million Stardust mission blasted off in February 1999 - more than
two years earlier than the Genesis departure. It is coming home next
month after a nearly seven-year space trek.

Test, test, test, and test

The lesson learned from Genesis is straightforward, said space engineer
Michael Ryschkewitsch who chaired the Genesis Mishap Investigation Board
(MIB) and is now deputy center director of the NASA Goddard Space Flight
Center in Greenbelt, Maryland.

"It's the same motto that we've all had for years and years and years.
Test, test, test, and test - this business is very hard and you can never
be too careful. That's not to say that anybody in the process was not
careful. There were people that were trying very hard - and sometimes
things don't go the way you want them to," Ryschkewitsch told SPACE.com.

Ryschkewitsch said that the MIB findings are to appear in two volumes:
One, an engineering autopsy that looks at the causes for the Genesis
crash landing itself, the other volume focused on the ground recovery
procedures that took place on the capsule's plow-down in Utah on
September 8, 2004.

NASA's chief medical officer was not pleased with the initial stages of
the ground recovery actions that took place. An MIB subteam was formed
to look into this matter, as well as the overall training of personnel
and steps taken by post-landing ground teams.

"There was not enough training by all of the people involved so that
everybody had the same knowledge," Ryschkewitsch said. In the minutes
following impact of the Genesis return sample capsule, he noted, there
was a conflict between ground units regarding what team was in charge
and what procedures they were operating to.

"Then the people that had been intended to be in charge under the normal
operation 'took over' and from that point on everything was okay,"
Ryschkewitsch added.

But what's the multi-million dollar answer to the question of why
Genesis took the fall in the first place?

Proximate cause

Back in October of 2004, the MIB had quickly identified a likely direct
cause of the failure of Genesis' parachute system to open.

The MIB - analyzing the badly crunched Genesis capsule - said the likely
cause was a design error that involved the orientation of gravity-switch
devices. Those tiny switches sense the deceleration caused by the
craft's high-speed entry into the atmosphere - switches that were then to
initiate the timing sequence that deployed the capsule's drogue
parachute, followed by release of a parafoil, followed by an in-the-air
helicopter capture.

That critical sequence did not happen. The capsule smacked into a
pre-determined landing site at the Utah Test and Training Range (UTTR),
a vast and unoccupied salt flat controlled by the U.S. Army and Air Force.

The inappropriate positioning of the gravity-switch devices
(g-switches) - upside down - led to the Genesis capsule's less-than-soft
touchdown. That wrongly placed piece of hardware was installed in 1998.

The g-switch problem has been identified by the Genesis MIB as the
"proximate cause", Ryschkewitsch said. That "most immediate cause"
spurred the MIB team to dig back and trace how that happened and how the
problem was not addressed prior to launch.

Installation error

Lockheed Martin Space Systems of Denver, Colorado designed, built and
operated the Genesis spacecraft, as well as the Stardust probe now en
route to Earth.

While the fundamental structures between Genesis and Stardust are
different, Ryschkewitsch said a great deal of commonality exists in the
avionics within the two systems, as well as procedural handling of the
entry capsule. Therefore, in some ways, Genesis is a technological
look-alike of Stardust, but in other avenues they are dissimilar.

That is why lessons learned from Genesis became a heads-up in some ways
for those dealing with the incoming Stardust spacecraft and its prized
catch of interstellar and comet particles.

Ryschkewitsch said that Genesis had a great deal more motor controllers
to handle the opening of its sample capsule, including the spreading of
paddles out into space to collect solar wind - gear that also tucked
inward for the ride home.

In the case of Genesis - why g-switch orientation was upside
down - Ryschkewitsch said that happened during the process of
reconfiguring the electronics from Stardust's design in order to
accommodate all of the extra motor controllers onboard Genesis.

"Most of the other functioning pieces of the spacecraft - the timers,
deployment mechanisms - are very similar," Ryschkewitsch said.

In their investigations, Ryschkewitsch advised that Stardust underwent a
"very specific test" to check g-switch function. That test was not done
on Genesis, due to a more complex setup of hardware, making it also a
more complicated test program, he said, with the g-switch installation
error going unnoticed.

Full-circle circumspection

In a kind of full-circle circumspection, the wreckage of the Genesis
sample return capsule underwent engineering scrutiny and testing at the
Waterton, Colorado facility of Lockheed Martin Space Systems, back where
both Genesis - and Stardust - were assembled.

Lockheed Martin supported the MIB, both in examining the recovered
hardware and in assembling documentation relevant to the development of
Genesis.

"We worked side-by-side with NASA to determine the cause of the Genesis
hard landing, and continually review our processes and procedures,
putting measures in place to avoid problems in the future," explained
Buddy Nelson, a spokesman for Lockheed Martin Space Systems.

"We've had the opportunity to review preliminary iterations of the MIB
report and have incorporated 'lessons learned' into our preparations for
the Stardust return next month, Nelson told SPACE.com.

"We are hopeful that the recovered samples captured by Genesis will
enable researchers to achieve most of their scientific objectives,"
Nelson said.

No lack of information flow

Meanwhile, Stardust draws closer to Earth.

Spacecraft blueprints, pre-flight photos, and a re-check of the Stardust
g-switch test have been thoroughly gone over, Ryschkewitsch said. "We
were fully satisfied with the responses to our recommendations - that they
had closed them all out. There has been absolutely no lack of
information flow."

Ryschkewitsch said that the Genesis incident, like other mishaps in
space, involves a chain of events. Processes are set up so that
spacecraft designers have multiple chances to catch errors.

"We talk about safety nets one behind the other and behind the other,"
Ryschkewitsch explained. "There were a number of different things and
very specific things that needed to be improved and tightened up."

In specific, there's been a beefing up of Stardust contingency plans, in
the event that things unexpected occur during the entry and parachute
landing of the sample capsule. Team training was enhanced, Ryschkewitsch
said, "to make sure people could react as quickly, efficiently, and as
safely as possible."

Internal wherewithal

No doubt, the drama of the Stardust samples coming back to Earth will
undoubtedly be a nail-bitter. The capsule carries no transmitter or
receiver. Like Genesis, it is on its own internal wherewithal to perform
as designed after a lengthy space voyage.

Stardust will undergo a blistering high-speed entry into Earth's
atmosphere on January 15th - the fastest human-made object to fireball
home as it plunges into the Utah Test and Training Range.

"A great deal of effort has gone into the planning, leading up to the
capsule's release - to make sure it's released in exactly the right place,
in the right direction, and to make sure it comes down on range,"
Ryschkewitsch said.

"Fundamentally this is a very, very tough business," Ryschkewitsch
concluded. "You've got many, many things that have to go exactly right."
Received on Wed 28 Dec 2005 01:46:46 PM PST