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As the crew worked through safing and power-down procedures on the runway, flames of exhaust could be seen shooting up from each side of the orbiter's tail. Initially startling viewers in person and television, the exhaust came from vents at the base of the tail for the auxiliary power units.
The APU's burn noxious hydrazine to provide power to the landing gear, speed brake and elevons, as well as repositioning the main engine nozzles after landing. The exhaust is vented by the tail and during daylight is barely noticeable. Even at night, the exhaust isn't very bright, but conditions this time accentuated the brightness of the flame and startled many observers.
A similar event occurred after STS-9 when the APU venting was more prominent than after the 8 previous flights. On that flight, however, there actually was a small fire that broke out in one of the APU's.
Originally posted by Bean328
That video link landing was the landing from the other night. It was exactly the same when I checked. A link name doesn't mean that's wat it is.