The single wrong character that shut down Phobos‑1's sun lock-was there time?
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ポッドキャストのフォローに失敗しました
ポッドキャストのフォロー解除に失敗しました
The single wrong character that shut down Phobos‑1's sun lock-was there time?
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The single wrong character that shut down Phobos‑1's sun lock-was there time?
In this episode, we follow the sequence of decisions, design choices, and human procedures that let one character in a maintenance upload execute a ground-only routine on a deep-space craft. The episode traces the Phobos program’s goals, the flight computer’s built‑in test command, and the ticking clock once the wrong character was sent - could human process and protocol avert disaster?
Person: Engineers and operators who handled Phobos‑1 uplinks
Date: August 29-30, 1988 (wrong character uploaded); September 2, 1988 (spacecraft stopped answering)
Event: Phobos‑1 received a maintenance command that shut down attitude control thrusters
Platform: One F flight computer with firmware-stored ground-test routine in read-only memory
Payload: Instruments from 14 nations including CNES infrared spectrometer and Swedish ASPERA
- The Phobos program aimed for orbital operations and lander deployment on Mars’s moon Phobos, carrying international instruments and the novel PROP‑F lander.
- The one F flight computer included a ground-testing routine in ROM that, if executed, disables three‑axis attitude control.
- Replacing the flight computer to remove that routine was technically possible but incompatible with the launch schedule, so the routine remained in firmware.
- The operational safeguard relied on human discipline: the specific character string that would trigger the routine was never to be sent.
- On the night of August 29-30, 1988, a maintenance upload contained a single wrong character; the transmission reached Phobos‑1, and the command executed.
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