ignition

[phjvh 0]

Hi,I know the ignition system is necessary for combustion and sometimes you even can choose between 1, 2 or both systems operable.Also the starter switches have several positions among them the "off-position", which cuts the ignition.Using: ( A:MASTER IGNITION SWITCH,bool) and ( >K:TOGGLE_MASTER_IGNITION_SWITCH) works so to say: it kills the engines!Is that reality?So the small questions:1. What is the place of the ignition switch in the jet panel?2. Does someone use it and how?Jan"Procul Negotiis"

[Guest Karl R Pettersen]

>Using: ( A:MASTER IGNITION SWITCH,bool) and >( >K:TOGGLE_MASTER_IGNITION_SWITCH) works so to say: >it kills the engines!>Is that reality?I believe so, after all you're turning off the ignition ;) In a Cessna 421B there would be a "guard-bar" that can switch off all magnetoes in one operation. In fact, there is also one such device for the three electrical master switches (battery and alternators). See http://www.aso.com/aircraft/78641/panel-2.jpg for reference (had to look it up :))The DC-3 is also equipped with a master ignition, unfortunately it defaults to on position at startup...(A:MASTER IGNITION SWITCH,bool) and (>K:TOGGLE_MASTER_IGNITION_SWITCH) could be used for these "guard-bars".Which reminds me to reprogram something in the C421B :DEdit: Didn't realize that links were automatically loaded. Oh well. In any case, see the metal bars on the "left panel", guarding the three abd four switches above the red starter switches.

[phjvh 0]

ThanksI see, but how and what in a jetplane?Jan

[Guest bartels]

I have to check back at home, but jet engines need ignition for starting not for permanent use, if I recall that right.BTW in old planes (DC3,JU52, etc.) the main switch on the ignition is a short circuiter, which short circuits the magnetos, so in case of windmilling the magnetos don't produce sparks.Arne Bartels

[phjvh 0]

Arne,What you write is correct.I'm only looking for a way to implement somewhere the A:var and K-event in my jetpanel.It is (until now?) not possible to use it for only one engine (using >K:engine,>K:select-1 etc.), which could be useful.So i fear the use is quite limited, cause all engines die immediately and there are several other ways to make one engine silent.Jan"Procul Negotiis"