CRJ200 question
09-14-2008 | 11:08 AM
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CRJ200 question
Fuel pump boost questions...after the engines are started on the CRJ does the fuel pump boost light go off or does it stay on ??? I am studying the regional jet course and i am confused on the part on the before start flow where it says to push the L & R fuel boost pumps on and 2 white lights should come on indicating on...but on the after start flow it says verify that the fuel pumps are on but the fuel panel should be dark..can anybody verify this..thanks
09-14-2008 | 11:15 AM
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From: FO
Fuel pump boost questions...after the engines are started on the CRJ does the fuel pump boost light go off or does it stay on ??? I am studying the regional jet course and i am confused on the part on the before start flow where it says to push the L & R fuel boost pumps on and 2 white lights should come on indicating on...but on the after start flow it says verify that the fuel pumps are on but the fuel panel should be dark..can anybody verify this..thanks
They(the lights) should be off with the engine's running. Think of them as in an "armed" position. When the pressure in the fuel line drops (I think it is below 9 psi) both boost pumps will come on and so will the lights and the status messages L (R) BOOST PUMP ON (not sure of the exact wordage)
09-14-2008 | 05:34 PM
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This is the problem with the dark cockpit concept, everything is on but not on. Hard to understand at first but then it eventually makes sense. To further confuse you, on the ground, pressing a boost pump button actually activates both boost pumps even if you didn't press the other boost pump. Whenever the on is illuminated it's just means the pump is on but there's not enough fuel flow in the system for the pump to go into stby.
09-14-2008 | 07:00 PM
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From: Aeroplanes
To further confuse the Boost pump issue, I once got a "L Fuel Low Press" caution message, neither boost pump came on, and the engine did not flame out. I'll let you scratch your head about that. And no, I don't believe the fuel pressure switch is like the oil pressure switch (pressure readout vs warn msg)
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