777lover From United States of America, joined Mar 2001, 96 posts, RR: 0 Posted (10 years 1 month 3 weeks 5 days 8 hours ago) and read 1799 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.
Jhooper From United States of America, joined Dec 2001, 6195 posts, RR: 13 Reply 1, posted (10 years 1 month 3 weeks 5 days 6 hours ago) and read 1747 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.
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OPNLguy From , joined Dec 1969, posts, RR: Reply 2, posted (10 years 1 month 3 weeks 5 days 5 hours ago) and read 1740 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.
M717 From United States of America, joined Dec 2002, 608 posts, RR: 5 Reply 3, posted (10 years 1 month 3 weeks 5 days 5 hours ago) and read 1743 times:
Jhooper,
If you're going to give a smart-a$$ answer, at least be accurate. Most jet engines have a start switch which opens the start valve and introduces air into the engine to begin the N2 rotation (or N3 in the RB-211). This same start switch also energizes the ignition. Then the fuel switch is moved on to introduce the fuel. On many engines, this action of introducing fuel also activates the ignition (the start switch only energizes the igniters).
Many modern jet aircraft are equipped with FADECs. In this case, the start sequence is all automatic, and controlled by the FADECs.
777Lover,
None of this applies to the CF34s on a CRJ, as I know nothing about that engine or aircraft. Unlike others, I will not presume to tell you what to do when I don't know myself.
Bhill From United States of America, joined Sep 2001, 842 posts, RR: 0 Reply 4, posted (10 years 1 month 3 weeks 5 days 5 hours ago) and read 1731 times:
Are the ignition devices on jet engines like a spark plug..i.e. timed discharges? Or more like a glow plug that is constantly on until switched off?
777lover From United States of America, joined Mar 2001, 96 posts, RR: 0 Reply 5, posted (10 years 1 month 3 weeks 4 days 5 hours ago) and read 1649 times:
OPNL,
My Dad is that guy who is knowledgable in starting TF34's. In the CRJ sim, he couldn't figure out how they started.
Jhooper From United States of America, joined Dec 2001, 6195 posts, RR: 13 Reply 6, posted (10 years 1 month 3 weeks 4 days 5 hours ago) and read 1636 times:
M717,
Thanks for correcting my faulty understanding of starting jet engines. I don't fly jets, so I wouldn't know the exact procedure. Then perhaps I should have refrained from posting; I apologize. But I do suggest that the checklist be followed; no smarta$$ness intended.
Regards
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JETPILOT From United States of America, joined May 1999, 3130 posts, RR: 32 Reply 7, posted (10 years 1 month 3 weeks 3 days 18 hours ago) and read 1585 times:
The ignitors in jet engines discharge like spark plugs.
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