NASA designed the Mars Climate Orbiter spacecraft to collect data about Mars' atmospheric con- ditions and serve as a data relay station. Instruments aboard the Orbiter would provide detailed information about the temperature, dust, water vapor, and carbon dioxide in Mars' atmosphere for approximately 2 Earth years. The Orbiter would also provide a relay point for data transmissions to and from spacecraft on the surface of Mars for up to 5 years. Nine months after launch the Orbiter arrived in the vicinity of Mars and fired its main engine to go into orbit around the planet. Everything looked normal as it passed behind Mars as seen from the Earth. After that, the Orbiter was never heard from again; presumably it had crashed into the planet. Paraphrasing project manager Richard Cook, "We had planned to approach the planet at an altitude of about 150 kilometers, but upon review of data leading up to the arrival, we saw indi- cations that the approach altitude was much lower, about 60 kilometers. We believe the minimum survivable altitude for the spacecraft would have been 85 kilometers." Later, an internal peer review attributed the $280 million mission loss to an error in the infor- mation passed between the two teams responsible for the Orbiter's operations, the spacecraft team in Colorado and the mission navigation team in California. In communicating back and forth, one team had used imperial units (feet, pounds), the other had used metric units (meters, grams). Without knowing it, the two teams were using different measurement systems for information critical for maneuvering the spacecraft into proper Mars orbit. QUESTIONS 1. 2. How could such a mistake have occurred between the two teams? What does the mistake suggest about the degree of interaction and coordination between the teams? 3. How might this problem have been prevented?

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NASA designed the Mars Climate Orbiter spacecraft to collect data about Mars' atmospheric con-
ditions and serve as a data relay station. Instruments aboard the Orbiter would provide detailed
information about the temperature, dust, water vapor, and carbon dioxide in Mars' atmosphere for
approximately 2 Earth years. The Orbiter would also provide a relay point for data transmissions to
and from spacecraft on the surface of Mars for up to 5
Nine months after launch the Orbiter arrived in the vicinity of Mars and fired its main engine to
go into orbit around the planet. Everything looked normal as it passed behind Mars as seen from
the Earth. After that, the Orbiter was never heard from again; presumably it had crashed into the
planet. Paraphrasing project manager Richard Cook, "We had planned to approach the planet at
an altitude of about 150 kilometers, but upon review of data leading up to the arrival, we saw indi-
cations that the approach altitude was much lower, about 60 kilometers. We believe the minimum
survivable altitude for the spacecraft would have been 85 kilometers."
Later, an internal peer review attributed the $280 million mission loss to an error in the infor-
mation passed between the two teams responsible for the Orbiter's operations, the spacecraft
team in Colorado and the mission navigation team in California. In communicating back and forth,
one team had used imperial units (feet, pounds), the other had used metric units (meters, grams).
Without knowing it, the two teams were using different measurement systems for information
critical for maneuvering the spacecraft into proper Mars orbit.
years.
QUESTIONS
1.
How could such a mistake have occurred between the two teams?
2.
What does the mistake suggest about the degree of interaction and coordination between
the teams?
3.
How might this problem have been prevented?
Transcribed Image Text:NASA designed the Mars Climate Orbiter spacecraft to collect data about Mars' atmospheric con- ditions and serve as a data relay station. Instruments aboard the Orbiter would provide detailed information about the temperature, dust, water vapor, and carbon dioxide in Mars' atmosphere for approximately 2 Earth years. The Orbiter would also provide a relay point for data transmissions to and from spacecraft on the surface of Mars for up to 5 Nine months after launch the Orbiter arrived in the vicinity of Mars and fired its main engine to go into orbit around the planet. Everything looked normal as it passed behind Mars as seen from the Earth. After that, the Orbiter was never heard from again; presumably it had crashed into the planet. Paraphrasing project manager Richard Cook, "We had planned to approach the planet at an altitude of about 150 kilometers, but upon review of data leading up to the arrival, we saw indi- cations that the approach altitude was much lower, about 60 kilometers. We believe the minimum survivable altitude for the spacecraft would have been 85 kilometers." Later, an internal peer review attributed the $280 million mission loss to an error in the infor- mation passed between the two teams responsible for the Orbiter's operations, the spacecraft team in Colorado and the mission navigation team in California. In communicating back and forth, one team had used imperial units (feet, pounds), the other had used metric units (meters, grams). Without knowing it, the two teams were using different measurement systems for information critical for maneuvering the spacecraft into proper Mars orbit. years. QUESTIONS 1. How could such a mistake have occurred between the two teams? 2. What does the mistake suggest about the degree of interaction and coordination between the teams? 3. How might this problem have been prevented?
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