The Canadair RJ is also equipped with an ADG, located on the right-hand side of the nose just aft of the radome. It deploys automatically when both engine IDGs and the APU generator go south. The crew can also manually deploy the unit. We occasionally have to test the ADG operation and since we lack the equipment necessarry to spin it up on the ground, we perform a test flight. What a racket! Both inside the cockpit and on the ground the noise is unmistakable. The ADG is also a good way to yank the chain of a green F/A or ramper. Many have been told that it is a trolling motor for water landings or an auxillary taxiing motor.
Thou shalt mind thine altitude,lest the ground reach up and smite thee.