Plain Aviation

the life of a planespotter and true avgeek

Category: Aviation Insight (page 2 of 2)

What is a trijet in airliner terms?

private boeing 727 trijet

A private Boeing 727 trijet. Photo by Andrew W. Sieber CC 2.0

As you can probably tell already, the term trijet refers to any commercial jetliner with three engines. Normally they either have all three engines mounted aft of the cabin and near the tail as seen on the Boeing 727, or two mounted on the wings and the third mounted at the tail as seen on the McDonnell Douglas MD-11. One common feature of all trijets is that their third engine is always going to be embedded inside the vertical stabilizer to ensure symmetrical thrust output. While this feature increases the difficulty of design, production, and maintenance, the cost-savings of operating trijets over four-engined airliners is definitely worth it.

Pros and Cons of planes with rear-mounted engines

delta connection bombardier crj900 n691ca rear engines

A Delta Connection Bombardier CRJ-900 with two rear-mounted engines. Photo by Andrew Cohen CC 2.0

Ever noticed that some airliners have a sleek-looking T-tail and engines mounted at the rear? This design is found most commonly on smaller aircraft such as regional and private jets. Some people hate it, while others think it looks sleek and stylish. Now you may be wondering why some aircraft have engines at the back and others don’t. There are actually several reasons why aircraft manufacturers would place engines at the rear on aircraft like the Boeing 717, 727, McDonnell Douglas MD-80, and Bombardier CRJ series to name a few.

Spotting Location 2 – GFS Headquarters

The name of this location is quite misleading as you’re not actually supposed to be spotting from outside the GFS headquarters. You’re welcome to try doing so, but most of the time you’ll be catching the butt of planes departing from 25L. I mean the APU exhaust and rear fuselage are quite sexy, but I’d rather catch the front. To get the right angle, you should be approximately halfway between the threshold of 07R and the GFS headquarters. This spot is really only good for 25L departures and 07R arrivals (which come at best once every hour). 07R departures are visible, however you won’t be able to get any shots due to the fence.

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