Best Technique for Brake Check on the A321
 

This has been a point of different views when it comes to checking brakes at the commencement of the Taxi-out phase of a flight.

On the A321 ( 320 Family) releasing the Parking Brake disconnects the Yellow Hyd Braking system and transfers braking to the Green Hyd system.

Is it better to release brakes let the A/C roll then smoothly apply brakes again.

Or by simply releasing brakes while holding the brake pedals for a brief period insures that the green hyd braking system is functional.

:ugh:

Our SOP accepts both methods, I prefer the "green system enable" method, besides, there are plenty of other opportunities to check brakes while taxiing to the active.

this is at least the most optimised method and saves an additional brake application.

Whichever way you choose to do it is fine as long as it doesn't involve slamming on the brakes and grinding to a near-halt with the poor cabin crew thinking we've it a brick wall as some I have witnessed.

Sooner rather than later after starting to taxi, gently press the brakes, see/feel evidence of retardation then release

Would a heavy 321 really start moving by releasing parkingbrake and an assumed green brake failure?

hetfield
 

What we are looking for is YELLOW system pressure moving to 0 when parking brake is released (whilst holding toe brake pressure).

errm...

This has been a point of different views when it comes to checking brakes at the commencement of the Taxi-out phase of a flight.

On the A321 ( 320 Family) releasing the Parking Brake disconnects the Yellow Hyd Braking system and transfers braking to the Green Hyd system.

Is it better to release brakes let the A/C roll then smoothly apply brakes again.

Or by simply releasing brakes while holding the brake pedals for a brief period insures that the green hyd braking system is functional.

Our customized FCOM SOP allows both thank you.