captjetblast
Posts: 288
Joined: Thu Aug 30, 2001 5:59 am

Ignition Mode Prior To Landing?

Thu Jul 24, 2003 5:53 am

Maybe I'm wrong, but i"ve heard something about setting ignition ON on finals. Is it something related to avoid sudden engines flameout near the runway?

Robert
 
Guest

RE: Ignition Mode Prior To Landing?

Thu Jul 24, 2003 6:36 am

It actually depends upon the requirements of the particular aircraft - I've flown some that require the ignitions to be "ON", and others where it's only necessary to to keep them in "AUTO". The requirement, when required , is to make sure that you keep the "fires" burning in the event of a sudden large power-lever movement - say, for example, a go around. The same thing goes for takeoff, some aircraft require you to use ignitions, other don't. The other times where you'd want to use ignitions is during moderate or greater turbulence and in heavy rain.

[Edited 2003-07-23 23:37:34]
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: Ignition Mode Prior To Landing?

Thu Jul 24, 2003 8:11 am

On the 757, with AUTO selected on the engine start panel (the standard setting after engine start), the selected igniter(s) will operate continuously whenever the flaps are extended to any angle away from zero, and/or engine anti-ice is on.

So we have no need to make a new selection prior to landing.
I used to love the smell of Jet-A in the morning...
 
AussiePete
Posts: 70
Joined: Tue May 27, 2003 10:35 am

RE: Ignition Mode Prior To Landing?

Thu Jul 24, 2003 9:47 am

Most Boeing airplanes will do this auto ignition mode when flaps are out and/or anti-ice is on.
 
captjetblast
Posts: 288
Joined: Thu Aug 30, 2001 5:59 am

RE: Ignition Mode Prior To Landing?

Thu Jul 24, 2003 9:15 pm

THANX TO YOU ALL!

Now can anyone explain what do the igniters exactly do?

 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: Ignition Mode Prior To Landing?

Thu Jul 24, 2003 9:18 pm

Think of very strong spark plugs and the capacitive discharge system needed to provide that strong spark. In the area of 15 to 40 joules of energy.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

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