Fire extinguishers after abort
B737 and B757
After abort, during Engine fire recall items, firing both bottles.
I was always of the understanding, and recently confirmed by someone I respect very highly, that there should be a delay between firing the bottles, to allow them each to fully discharge. Otherwise, one may not be fully discharged, ad so you lose the benefit of part of the contents. As they utilise the same plumbing, to route to the same outlets, there needs to be a delay.
At another organisation, I have been told that both are to be fired into a burning engine, without a delay between them.
ie. Rotate the fire handle, orange discharge light, rotate the handle, orange discharge light. With no delay between seeing the first discharge light, and rotating for the second bottle.
In the air, it's 30seconds between discharges, to allow the full discharge and note any change or lack.
Is the discharge light related to drop in pressure, or simply that the squib has fired?
I feel the subtle difference during the ground related drill is being lost.
Comments?
Tech response?