You’ve been driving on a long stretch of empty interstate when you see a truck stop. It’s time to take the exit to reenergize and fuel up.
A quick stop at the top of the overpass, then a left turn to cross the highway, and soon you arrive at your destination. After refueling, you jump back on the interstate with equal ease.
Of course, at a towered airport, so long as it’s safe, do as the controller instructs. But at nontowered airports—which are the vast majority—the traffic pattern has established entry and departure recommendations. To grab the exit from the sky to the airport, the best practice is to enter the pattern flying an inbound course at a 45-degree angle to the runway you want to land on, at pattern altitude, intercepting the outside of the downwind leg midfield. This gives you a commanding view of action in the pattern, and if everyone follows recommended procedures, we all know where to expect other airplanes. This assumes an arrival direction from the downwind side of the airport.
If you’re arriving from the other side, there are two different entry methods. The preferred method is to cross the airport midfield, 500 feet above the highest pattern. Then fly two miles beyond the airport traffic pattern, execute a descending teardrop—which is always good fun—and join the standard 45-degree entry. The alternate method is to enter the pattern from a midfield crosswind at pattern altitude, and enter the downwind from the inside of the leg after crossing the field. Such a pattern entry is generally unexpected; if the pattern is busy, this is a hazardous approach, and I mean that literally.
Departing the pattern in a standard manner is as important as entering it in a standard manner. Either fly the runway heading until you are above the traffic pattern or climb to the traffic pattern altitude, exit on a 45-degree turn toward the traffic pattern direction, and fly this heading until clear.
Then navigate to the next truck…err…planestop.