The drone had been in the air for close to five hours before its mission crew realized that something was wrong. The oil temperature in the plane's turbocharger, they noticed, had risen into the "cautionary" range. An hour later, it was worse, and it just kept rising as the minutes wore on. While the crew desperately ran through its "engine overheat" checklist trying to figure out the problem, the engine oil temperature, too, began skyrocketing.
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