Bugs with the bae146's throttle.
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Hello, I have come aware that when I am landing with the 146, when I retard the throttle to idle the engines actually do not go to idle, they go to an N1% of about 36 and they stay like that until I push the throttle forward a little bit and then pull it back once again. This prevents the spoilers on the top of the wings to deploy and therefore creates a drastically longer landing distance unless you are quick to fix this. Is this a bae146 thing or just a bug with the 146 because it doesn't seem normal.
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That is correct behaviour for the 146 as it's simulating the difference between flight idle and ground idle. When the aircraft is in the air, the flight idle baulk will prevent the throttles from being reduced to ground idle. When the aircraft is on the ground, the flight idle baulk is removed and the throttle can be reduced to ground idle.
The correct procedure during landing would be to reduce the throttles to flight idle, then upon touchdown reduce the throttles to ground idle and extend the lift dumpers.
This can be a little tricky depending on what hardware setup you have, but you can move the throttles to ground idle after touchdown by triggering the respective THROTTLE DECREASE control assignments. Alternatively, you can enable the "AUTO GROUND IDLE" option on the EFB and the throttles will automatically move from flight idle to ground idle upon touchdown.
Mark - Just Flight
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Yes, the flight idle baulk in the real aircraft would prevent the throttles from moving to ground idle when the aircraft is airborne. The two idle positions are actually marked on the throttle quadrant too. "IDLE" is the flight idle position. "ON" is the fuel on / ground idle position.
Mark - Just Flight
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Bugs with the bae146's throttle?
Pedantic mode. The 146 is not equipped with ‘throttles’… it does have THRUST LEVERS though.
As Mark suggests, the flight idle bulk is a bit of a movable feast. The settings are referenced to N2. There are two flight idle bulk positions; 60% and 67% N2. During approach, below 200-250ft rad alt with engine anti-ice OFF, the bulk will reduce to 60% N2. With engine anti-ice ON the bulk will be at 67% N2. Apart from when there is a DC 1 or DC 2 failure the flight idle bulk will withdraw on landing and allow the thrust lever to be retarded to ground idle. From a performance viewpoint it’s important to close the thrust levers to ground idle quickly and to select the airbrake lever through its bulk and extend the spoilers. A few early aircraft only had the 60% bulk and it was important to observe the 67% limit with engine anti-ice on.
