777lover
Topic Author
Posts: 93
Joined: Mon Mar 12, 2001 11:36 pm

How Do You Start A CF34?

Sat Mar 29, 2003 3:29 am

I was just wondering how you started a CF34 engine in, say, a CRJ. I know in an A-10 (TF34, same engine) you slide the throttles back into a notch that is ahead of the off position. I was in a CRJ sim with a person I know who is knowledgable in starting TF34's and he was wondering how you started the CF34's. He thought it would be the same way because he could not find a start button in the CRJ sim.
 
jhooper
Posts: 5560
Joined: Thu Dec 13, 2001 8:27 pm

RE: How Do You Start A CF34?

Sat Mar 29, 2003 5:28 am

Read the checklist. It likely has a starter valve to start the fuel flow and then another switch to light the spark, much like other jet engines.
Last year 1,944 New Yorkers saw something and said something.
 
OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: How Do You Start A CF34?

Sat Mar 29, 2003 5:55 am

>>>a starter valve to start the fuel flow and then another switch to light the spark

That's 2 out of the 3 things needed, i.e. something is missing, and if attempted this way in a real jet engine, you'd have some problems on your hands.


777lover,
Your profile mentions your Dad was a NJ 737 captain, and if so, I'm sure he'd be able to explain the basics of jet engine operation, including the detailed information that you seek.


ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
m717
Posts: 540
Joined: Tue Dec 31, 2002 1:01 pm

RE: How Do You Start A CF34?

Sat Mar 29, 2003 5:57 am

Jhooper,

If you're going to give a smart-a$$ answer, at least be accurate. Most jet engines have a start switch which opens the start valve and introduces air into the engine to begin the N2 rotation (or N3 in the RB-211). This same start switch also energizes the ignition. Then the fuel switch is moved on to introduce the fuel. On many engines, this action of introducing fuel also activates the ignition (the start switch only energizes the igniters).

Many modern jet aircraft are equipped with FADECs. In this case, the start sequence is all automatic, and controlled by the FADECs.

777Lover,

None of this applies to the CF34s on a CRJ, as I know nothing about that engine or aircraft. Unlike others, I will not presume to tell you what to do when I don't know myself.
 
bhill
Posts: 1317
Joined: Thu Sep 13, 2001 8:28 am

RE: How Do You Start A CF34?

Sat Mar 29, 2003 6:14 am

Are the ignition devices on jet engines like a spark plug..i.e. timed discharges? Or more like a glow plug that is constantly on until switched off?

Cheers,

Bob
Carpe Pices
 
777lover
Topic Author
Posts: 93
Joined: Mon Mar 12, 2001 11:36 pm

RE: How Do You Start A CF34?

Sun Mar 30, 2003 5:56 am

OPNL,

My Dad is that guy who is knowledgable in starting TF34's. In the CRJ sim, he couldn't figure out how they started.

Thanx to Everyone
 
jhooper
Posts: 5560
Joined: Thu Dec 13, 2001 8:27 pm

RE: How Do You Start A CF34?

Sun Mar 30, 2003 6:41 am

M717,

Thanks for correcting my faulty understanding of starting jet engines. I don't fly jets, so I wouldn't know the exact procedure. Then perhaps I should have refrained from posting; I apologize. But I do suggest that the checklist be followed; no smarta$$ness intended.

Regards
Last year 1,944 New Yorkers saw something and said something.
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: How Do You Start A CF34?

Sun Mar 30, 2003 5:07 pm

The ignitors in jet engines discharge like spark plugs.

JET

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