The cases and adventures of the Emergency Services Detail of the Los Angeles County Sherriff's Department. In particular we see the exploits of Deputy Theodore Roosevelt "Trap" Applegate III and Deputy Dwayne "Thib" Thibideaux, the crew of the Detail's helicopter, 240-Robert.
A series that enthralled me as a kid. A great mix of action, adventure, humour and human drama. The fact that these guys were emergency services personnel operating in a police environment with police operations made it even more interesting as you had the best of both worlds.
The show is also notable for being one of the first shows or movies to have Mark Harmon in a leading role. He was reasonably unknown until this point.