A320 OP CLB behaviour
Join Date: Jul 2006
Location: Somewhere over the rainbow
Posts: 944
Likes: 0
Received 0 Likes
on
0 Posts
Hahaha! Could not agree more! A bit like guys going heads down in the MCDU to delete the 250kt speed constraint below FL100 instead of selecting the speed on the FCU... smh
Absolutely. I'm not entirely sure why we do it that way, I haven't been here long and this is just what they're doing. As far as I know there is no prohibition on using open climb instead.
Thread Starter
Join Date: Mar 2006
Location: USA
Posts: 2,509
Likes: 0
Received 0 Likes
on
0 Posts
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,396
Likes: 0
Received 0 Likes
on
0 Posts
NO doubt when possible managed modes should be used but when unrestricted climb has been given use of OP CLB is what it is for. To stay in CLB by deleting waypoint is creating laborious head down work because you have to ensure you are not deleting a wrong constraint. Climb and descent have a difference. CLB and OP CLB are same without constraints they don't track any vertical path but in descent even without constraints DES follows a path calculated all the way to 1000ft on approach. OP DES is used only when you want max rate of descent with idle thrust. If you deleted constraints in descent FMS will rework the path but nothing of that sort happens in climb.
Join Date: Dec 2010
Location: MC80 Home One type Star Cruiser
Posts: 192
Likes: 0
Received 0 Likes
on
0 Posts
The autothrust is quite slow to react to changes, it probably targeted the lower speed first by reducing power and then realised you wanted to climb so it increased power. It's a 1980s design and can't keep up with even a modern smartphone. You would have been better off waiting until the aircraft was properly established in the climb before winding the speed back or managing it.
A previous operator had a number of aircraft that would exhibit this behaviour. Traditionally in open climb reducing speed would produce a pitch response to meet the target but one software fit would trigger the auto thrust to reduce thrust instead. I remember the first time I saw it there were a few expletives and why is it doing that. The software changed a few months later back to what I had been used to.
Open climb should be a speed based pitch mode with auto thrust commanding climb thrust, not the autothrust commanding speed
Open climb should be a speed based pitch mode with auto thrust commanding climb thrust, not the autothrust commanding speed
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,396
Likes: 0
Received 0 Likes
on
0 Posts
Open climb should be a speed based pitch mode with auto thrust commanding climb thrust, not the autothrust commanding speed
Last edited by vilas; 4th Oct 2019 at 03:31.