Design
Passengers are boarded using the rear door (which is rare for a passenger aircraft) as the front door is used to load cargo. Finnair ordered their ATR 72s with a front passenger door so that they could use the jet bridges at Helsinki–Vantaa airport.
A tail stand must be installed when passengers are boarding or disembarking in case the nose lifts off the ground, which is common if the aircraft is loaded or unloaded incorrectly.
The ATR aircraft does not have an auxiliary power unit (APU) as normally equipped. The APU is an option and would be placed in the C4 cargo section. Most air carriers normally equip the aircraft with a propeller brake (referred to as "Hotel Mode") that stops the propeller on the #2 (right) engine, allowing the turbine to run and provide air and power to the aircraft without the propeller spinning. The downside to the prop brake is improper usage; many airlines have burned out these brakes, so some companies have removed them from the aircraft entirely.
Read more about this topic: ATR 72
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