Originally Posted by
Machrihanish
SIA use
rotor markings which are clearly distinguishable from quite a number of rows of the front fuselage and should suffice as a fall back to identify the engine's spinning down, if req'd.
Cabin Crew are required to stand by their station when they operate in emergency mode.
They shouldn't leave the area as pax can freak out and open a door. So they can't really check if the engines are on.
The viewing window of the cabin door and nearest pax window are the main means to check outside conditions for their respective door and, I repeat, no cabin crew is trained to check if engines are on or off. If the evacuation is required they would open any door that doesn't have a danger outside.
Also, there is absolutely no way FD crew didn't know about the fire. Details will soon emerge and we'll see what challenges they had to deal with.