Just recently came across an article on the Internet that detailed the differences between the various DC-9 models, as well as the MD-80 series, the MD-90 and B717. I thought it was a very interesting article and I wanted to share it with you.

At a glance and from a distance, it might not seem as there are that many differences between the various models. But if you look closer, there are actually quite few a changes, stretches and improvements that set the various models apart.

You can read the full article over at Airlinercafe.com.

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DC-9 Autopilot

The DC-9 is equipped with the Sperry SP-50 Automatic Flight Control System (AFCS), which is a gyroscopically controlled electromechanical system. The DC-9 is an old school aircraft and the autopilot installed in this aircraft is very much old school too. If you are used to flying with modern autopilots, you will find that this autopilot works a bit differently than the other autopilots you may be familiar with.