NASA WIRE spacecraft coolant loss
NASA's Wide-Field Infrared Explorer lost its entire supply of cryogenic coolant just after launch, ending its primary science mission before it began.
The damage was public. The root cause was preventable.
NASA's Wide-Field Infrared Explorer lost its entire supply of cryogenic coolant just after launch, ending its primary science mission before it began.
What the software actually got wrong
A digital logic error in the instrument's pyrotechnic control electronics failed to account for the finite time an FPGA chip needs to reach a stable configuration at power-on, causing the telescope's protective cover to be ejected prematurely and exposing the coolant to sunlight, which boiled it away and spun the satellite out of control.
A digital logic error in the instrument's pyrotechnic control...
A digital logic error in the instrument's pyrotechnic control electronics failed to account for the finite time an FPGA chip needs to reach a stable configuration at power-on, causing the telescope's protective cover to be ejected prematurely and exposing the coolant to sunlight, which boiled it away and spun the satellite out of control.
Requs AI Edge Case flags this exact pattern at the requirements and architecture stage — before a single line of code implementing it exists — so the assumption behind it gets challenged while it is still cheap to fix.
Beyond code coverage and "shall" testing
Root causes like this one rarely show up in code coverage or requirements-compliance testing, because nobody wrote a requirement anticipating the specific edge case that broke. Requs AI Edge Case and Requs AI Software FMEA are built to surface exactly this class of overlooked failure mode — before the software is written.
Surfaces this before code exists
Identifies edge cases like this one at requirements and architecture time, using the Common Defect Enumeration to catalog failure patterns seen across hundreds of real-world software failures — including this one.
Connects the failure mode to the hazard
Traces this class of root cause directly to the system-level hazard it can produce, so a defect pattern like this one gets flagged during design review instead of after it ships.
Find the overlooked root causes before they ship.
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