Bombardier designed the DHC-8-400, or Q400, as a successor to the popular DHC-8-100/200/300 series of turboprops, utilizing the latest technology to make the aircraft one of the most advanced turboprops in the market. With the success of Bombardier's 70-seat CRJ-700 jet, the company saw a potential market for stretching it's DHC-8s turboprops to accommodate 76-seats with much more efficiency than a jet can offer, but similar speed. Along with modern avionics and powerful modern engines, Bombardier also included electronic noise cancelling in the cabin to eliminate much of the dreaded noise of the props for passengers, hence the "Q" for Quiet. The aircraft first flew in 1999, with 3 variants; the DHC-8-400/401/402, with capacities of 68, 70, and 78 passengers respectively. FlyBe was the first airline to put the type into service in 2001, and the aircraft had grown into one of the world's most popular turboprop airliners by the mid 2000s. The aircraft's landing gear design lead to frequent incidents where one of the gear would collapse during hard landings, especially in crosswinds where one side of the aircraft would touch down before the other. Despite this, the aircraft was a success, and remains in service around the world today, though many US carriers retired the type by the mid to late 2010s. 

The following high quality add-ons are available for this aicraft:

Majestic Software Q400 (Professional): Prepar3Dv4/5, Microsoft Flight Simulator X/Prepar3Dv1-3

Majestic Software Q400 (Standard):  Prepar3Dv4/5, Microsoft Flight Simulator X/Prepar3Dv1-3

Virtualcol DHC-8-100/20/300/Q400: Prepar3Dv1-4/Microsoft Flight Simulator X 

FlyJSim Q400: X-plane