1.What is the 4 yellow when clicked becomes 3?

 

 

 

2.If septum manually bugs fuel flow and the bug p7, the 4 green lights engine light up all together even when the engine 4 is at full capacity.

Six instead takeoff with various bug set with the take off calculator before the green lights come on engines 1, 2, 3. After the green light 4 when it is operating. Why this difference?

1. This is a placard to remind the crew if the aircraft needs 3 or 4 reheats functioning to continue takeoff. If the selection is 4 , then the aircraft is a "stopper" and if one reheat fails before 100 knots the takeoff will be aborted. In the SSTSIM the FE will call "engine failure"

 

2. Due to air vortices causing vibration at low speed engine 4 needs to be kept at 88% N2 until above 60 knots. Once above 60 knots the engine will automatically be allowed to increase power to match the other three.

 

Due to air vortices causing vibration at low speed engine 4 needs to be kept at 88% N2 until above 60 knots. Once above 60 knots the engine will automatically be allowed to increase power to match the other three.

 

Sorry for butting in here, but.....why only the one engine? Wouldn't the same happen to the equivalent engine on the other side of the plane?

Sorry for butting in here, but.....why only the one engine? Wouldn't the same happen to the equivalent engine on the other side of the plane?

No. Engines 1 and 4 are both turning in the same direction. The air vortices off the left and right wing are moving in opposite circular directions. The vortices from the left wing come into contact (through the air intakes and vane doors) with engine number 1 but are moving in the same direction as the engine...no vibration. The vortices off the right wing are spinning the other way and so cause vibration when they contact the engine.