BAe146
aerobat77 said
"on the bae146 we had a procedure for exact this situation . when fire warning was triggered- thrust lever idle and fire handle to the first detent what automatically cuts the bleed air."
May I suggest that you re-view your technical manual.
Pulling the fire handle out to the initial baulk, operates a micro-switch that lights "ENG FIRE HANDLE" annunciator on the MWS.
Remember "White over Red"
This is so the Handling pilot dose not have to look up to confirm that the correct handle has been pulled!
the second detent, or full travel, 3 additional micro-switches operate that:
(a) close bleed air
(b) trip Engine driven Gen on engine 1 & 4
(c) close Hyd systems on engine 2 & 3
and then rotating left or right 90 degrees fires bottle 1 or 2