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How Do You Start A CF34?  
User currently offline777lover From United States of America, joined Mar 2001, 96 posts, RR: 0
Posted (11 years 6 months 1 week 3 days ago) and read 2403 times:

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.

7 replies: All unread, jump to last
 
User currently offlineJhooper From United States of America, joined Dec 2001, 6204 posts, RR: 12
Reply 1, posted (11 years 6 months 1 week 2 days 22 hours ago) and read 2351 times:

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.
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 2, posted (11 years 6 months 1 week 2 days 22 hours ago) and read 2344 times:

>>>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.




User currently offlineM717 From United States of America, joined Dec 2002, 608 posts, RR: 4
Reply 3, posted (11 years 6 months 1 week 2 days 22 hours ago) and read 2347 times:

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.


User currently offlineBhill From United States of America, joined Sep 2001, 980 posts, RR: 0
Reply 4, posted (11 years 6 months 1 week 2 days 21 hours ago) and read 2335 times:

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
User currently offline777lover From United States of America, joined Mar 2001, 96 posts, RR: 0
Reply 5, posted (11 years 6 months 1 week 1 day 22 hours ago) and read 2253 times:

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


User currently offlineJhooper From United States of America, joined Dec 2001, 6204 posts, RR: 12
Reply 6, posted (11 years 6 months 1 week 1 day 21 hours ago) and read 2240 times:

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.
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 7, posted (11 years 6 months 1 week 1 day 10 hours ago) and read 2189 times:

The ignitors in jet engines discharge like spark plugs.

JET


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