I noted in the manual that on landing, and when using 3rd party rudders (I use CH), that it sometimes takes some "convincing" to have the autobrakes kick off on roll out. I also noted (again in the manual) that after takeoff you have to manually return the autobrakes selector from RTO to OFF. Does this mean that when things are working correctly, on landing once slowed up and you are using the CH brakes, the autobrake selector should return to "OFF" automatically, or do you need to manually select it to "OFF" after landing as well? They are working for me, but I'm not sure if I'm leaving them on too late in the roll, or if they disconnect after a certain speed but the selector knob stays where you set it prior to landing (in other words, if you have them set to "2", are they still active until you return the knob to "OFF"?).

 

Thanks much.

They are working for me, but I'm not sure if I'm leaving them on too late in the roll, or if they disconnect after a certain speed but the selector knob stays where you set it prior to landing (in other words, if you have them set to "2", are they still active until you return the knob to "OFF"?).

 

The autobrake ceases to function as soon as you brake manually regardless of the selector switch position; an amber warning near the switch confirms this.

 

Iain Smith

On 737 autobrake selector switch can be moved manually only.

 

they disconnect after a certain speed

 

FCOM vol.2, page 14.20.5 states conditions for autobrake disengagement on landing.

Ahh, very good. Thanks!