WestJetForLife
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Question For The CRJ Pilots

Sun Aug 23, 2009 2:53 am

Hey guys. Nik here again with another question (since around here, there are no stupid questions).

I have labored long and hard using the search function for this topic, but I did not find resolve. Here is the question for CRJ pilots/techs.

Looking at the photos of the CRJ flight deck, I notice the absence of a fuel cutoff switch, such as in the 737, which is right below the two throttle levers.

In a start-up scenario, how does one introduce fuel to the engines in the CRJ model?

Any help would be appreciated.  Smile

Nik
I need a drink.
 
Mir
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RE: Question For The CRJ Pilots

Sun Aug 23, 2009 2:58 am

There's a fuel cutoff position on the throttles, all the way back (beyond idle). During start, you lift up on a lever that releases a lock, and you move the throttle out of cutoff and into idle, which lets fuel flow to the engine. During flight, the lock keeps the throttles from inadvertently being moved back past idle into cutoff. Shutdown is accomplished by moving the throttles into cutoff, again using the lever to bypass the lock.

-Mir
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HAWK21M
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RE: Question For The CRJ Pilots

Sun Aug 23, 2009 7:19 am


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Photo © Jeroen Stroes - Dutch Aviation Photography
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Photo © Boo-Man Photography


Clear view.
regds
MEL.
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Mir
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RE: Question For The CRJ Pilots

Sun Aug 23, 2009 6:02 pm



Quoting HAWK21M (Reply 2):

Thanks for the pictures. Those red things underneath the throttles are the levers I was talking about.

-Mir
7 billion, one nation, imagination...it's a beautiful day
 
WestJetForLife
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RE: Question For The CRJ Pilots

Sun Aug 23, 2009 11:37 pm

Mel, Mir, thanks a lot!

That's quite interesting that the CRJ series aircraft do not have fuel cutoff "switches", yet that they use the actual throttle control levers to introduce fuel to the aircraft's engines.

Another marvel of Canadian Aviation technology. Must be bad news bears if the throttles get stuck or if the levers don't work.

Nik
I need a drink.
 
DashTrash
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RE: Question For The CRJ Pilots

Mon Aug 24, 2009 2:45 am

Quite common actually. All the Citations, early Lears, and Sabreliners use the same method.
 
Goldenshield
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RE: Question For The CRJ Pilots

Mon Aug 24, 2009 4:47 am



Quoting DashTrash (Reply 5):
Quite common actually. All the Citations, early Lears, and Sabreliners use the same method.

Turboprops as well, but on the prop condition lever.
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pilotpip
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RE: Question For The CRJ Pilots

Mon Aug 24, 2009 6:55 pm

Embraer jets don't have a fuel cutoff at all (normal ops, fire handles still shut off the fuel). The engine start/stop levers do it and the start is electronically controlled.
DMI
 
flyingbronco05
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RE: Question For The CRJ Pilots

Mon Aug 24, 2009 8:07 pm



Quoting Pilotpip (Reply 7):
Embraer jets don't have a fuel cutoff at all (normal ops, fire handles still shut off the fuel). The engine start/stop levers do it and the start is electronically controlled.

Love the FADEC's!  Big grin
Never Trust Your Fuel Gauge
 
DashTrash
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RE: Question For The CRJ Pilots

Mon Aug 24, 2009 8:48 pm



Quoting Pilotpip (Reply 7):
Embraer jets don't have a fuel cutoff at all (normal ops, fire handles still shut off the fuel). The engine start/stop levers do it and the start is electronically controlled.

Would you believe the Citation X still has the fuel cut off on the thrust levers? You can bring them out of cutoff anytime after the start button is pressed since the FADECs are controlling the start, but you shut the engines down by pulling the thrust levers to cutoff. Same engine / avionics as the ERJ.
 
pilotpip
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RE: Question For The CRJ Pilots

Wed Aug 26, 2009 3:00 am

Interesting. Do they have the buttons to change the modes (CLB, CRZ, CON...) like the 145 does? Or is it just detents? I've never really looked at the inside of a 750 and the couple times I did I didn't know enough about what I was looking at to remember.

All depends on the installation I guess. Most TPE-331 installations like the MU-2 and Jetstreams have two levers, yet the King Air 100 has three for each engine.

I'd imagine it all has to do with different manufacturer's philosophies on the setup. The 170 has a similar setup to the 145 in how the thrust settings can be commanded. In most cases it's automated (like most stuff on the 170)but can be commanded by us, via the MCDU instead of buttons on the pedestal. Another interesting change is that when the settings change in the 145 the "curve" at which power is applied according to thrust lever angle changes whereas in the 170 it basically rolls the max N1 back on the autothrottles. If you push the levers forward they'll still go beyond this and the rate of power doesn't change according to mode. However, the basic logic and modes are still the same despite the CF-34s
DMI
 
DashTrash
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RE: Question For The CRJ Pilots

Wed Aug 26, 2009 6:05 pm



Quoting Pilotpip (Reply 10):
nteresting. Do they have the buttons to change the modes (CLB, CRZ, CON...) like the 145 does? Or is it just detents? I've never really looked at the inside of a 750 and the couple times I did I didn't know enough about what I was looking at to remember.

It's all detents. Takeoff, climb and cruise dentents. Also has a max power dentent above the takeoff, but it does absolutely nothing. You still get takeoff power with the thrust levers up there. It still works pretty much the same as the ERJ, just without the push buttons.

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