General > General Technical Chat
WTF!!! (French Airforce FUBAR)
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jogri:

--- Quote from: paulca on April 15, 2020, 05:47:55 pm ---I only know sim aircraft, but the F18, A10, Harrier and F14 ALL have a "Seat Arm" lever, either where the armrest would be or on the side of the seat.  In rafale cockpit photos you can see a flat yellow and black chevron's lever beside the pilots thigh.  I think that's the same thing.

--- End quote ---

That's not the handle of the ejection seat, that handle is there in case the ejection seat doesn't separate from the pilot after he ejected himself (it should be marked "manual release"). I don't think that it will initiate the ejection sequence if you pull on it.
wasyoungonce:

--- Quote from: jogri on April 15, 2020, 04:18:26 pm ---.......They probably use something like C4 for the pyrotechnic lines so the chances of it going off on its own after the line has been severed are basically nonexistent ...
--- End quote ---

SMDC...Shielded Mild Detonating Cord.......https://psemc.com/products/shielded-mild-detonating-cord/.
Used for the Canopy initiator.  The seats have more than one charge.   I don't know what they use but they look like large blanks.  Usually 2 in each seat.  2 are for ejection then solid rocket motor initiates .... I think....sometimes a small SMDC for automatic sear of the harness release.
paulca:

--- Quote from: jogri on April 15, 2020, 09:41:34 pm ---
--- Quote from: paulca on April 15, 2020, 05:47:55 pm ---I only know sim aircraft, but the F18, A10, Harrier and F14 ALL have a "Seat Arm" lever, either where the armrest would be or on the side of the seat.  In rafale cockpit photos you can see a flat yellow and black chevron's lever beside the pilots thigh.  I think that's the same thing.

--- End quote ---

That's not the handle of the ejection seat, that handle is there in case the ejection seat doesn't separate from the pilot after he ejected himself (it should be marked "manual release"). I don't think that it will initiate the ejection sequence if you pull on it.

--- End quote ---

No it arms the ejection seat.  Or disarms it, so the handle will not fire the seat.  I expect it is more of a safety interlock thing, with that handle raised the seat will not and cannot fire.

http://www.ejectorseats.co.uk/martin%20baker%20sju5a.html

This describes it as the "Safe/Arm handle"

We were talking about accidental firing of the seat.  Consider getting into a powered on plane in a hangar.  One does NOT want the seat armed.  The seat is armed in the taxi checklist or after leaving the hangar and closing the canopy.  Before the canopy is closed the pilot can get out of the aircraft in case of fire and be safer than a 0 foot ejection.
Gixy:
Yes, and those levers are secured by "remove before flight" pins which must be shown by the mecanics to the pilot(s) once on board.
langwadt:

--- Quote from: paulca on April 16, 2020, 06:48:53 am ---
--- Quote from: jogri on April 15, 2020, 09:41:34 pm ---
--- Quote from: paulca on April 15, 2020, 05:47:55 pm ---I only know sim aircraft, but the F18, A10, Harrier and F14 ALL have a "Seat Arm" lever, either where the armrest would be or on the side of the seat.  In rafale cockpit photos you can see a flat yellow and black chevron's lever beside the pilots thigh.  I think that's the same thing.

--- End quote ---

That's not the handle of the ejection seat, that handle is there in case the ejection seat doesn't separate from the pilot after he ejected himself (it should be marked "manual release"). I don't think that it will initiate the ejection sequence if you pull on it.

--- End quote ---

No it arms the ejection seat.  Or disarms it, so the handle will not fire the seat.  I expect it is more of a safety interlock thing, with that handle raised the seat will not and cannot fire.

http://www.ejectorseats.co.uk/martin%20baker%20sju5a.html

This describes it as the "Safe/Arm handle"

We were talking about accidental firing of the seat.  Consider getting into a powered on plane in a hangar.  One does NOT want the seat armed.  The seat is armed in the taxi checklist or after leaving the hangar and closing the canopy.  Before the canopy is closed the pilot can get out of the aircraft in case of fire and be safer than a 0 foot ejection.

--- End quote ---

Looks like the Rafale uses a newer seat, http://martin-baker.com/wp-content/uploads/2017/05/mk16_rafale.pdf

but I'm sure it also has some safety lock out for maintenance and before you are strapped in
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