Some Dash-8 Questions
 

Hey guys.

Looking over some of the Dash-8 stuff, and having a hard time finding info on a couple of things.

Firstly the Fuel Heater. I talked to some friends that fly/flew other Turbo-props, and they have said that the fuel is heated by then Prop-oil, which I assume is basically the engine oil. Is this correct? I just want to make sure its right.

Also, if the aircraft is being refueled by the single-point pressure refueling, and the battery switches in the ****-pit are turned off, and assuming there is no external power source will the fueling sieze? If the hot-battery bus switch is fliped on the refuel panel, then the system is powered by the hot-battery bus, and fueling will continue normally. But how about if all electrical power is lost?

Thanks for any help, this airplane is so complicated compared to the Cherokee. lol

which series are you talking about? 1,2,3 or 4

In the 400 series the fuel is heated by the FOHE or Fuel Oil Heat Exchanger. The oil is pumped from the engine to the fuel collector bay on the inboard portion of the wings where two things happen 1. The hot oil heats the cold fuel and 2. The cold fuel cools the hot oil. It is a win win situation for both systems.

lol, woops. I was refering to the 100 and 300.

So the fuel is heated at the collector bay? Good to know. I imagine it would be the same for the other models, but I'll look into it.

SP fueling can be done with all power off in the cockpit. As long as the batteries are connected, it can be refueled. The power switch is guarded and closes to the off position when the refueling door is closed, so the refueler cant leave it on accidentally as long as the door is closed. What you do need to watch for though is the "Fueling On" light (bottom right of the caution panel), this will stay on if the switch in the refueling bay is left in 'refuel' or 'defuel' position. If it is then you cannot transfer fuel.

The fuel is not heated in the collector bay. but in the nacelle before the engine driven pump. Tank temp is taken from the collector bay, but fuel temp is sensed between the heat exhanger and the EDP. This is the point where the 11-57 degree C limitation applies.

Hope this helps.