A300 severely underpowered in climb

[w6kd]

With a relatively light takeoff gross weight of 284,000 lbs, I'm seeing a super-anemic climb rate of ~700-800 fpm climbing through the high 20s.

Climb performance is largely a function of thrust-to-weight ratio.  A full-loaded 747-400 at 875,000 lbs with four of the same CF6 engines has a thrust-to-weight ratio of 0.26, and can climb at 2000-3000 fpm in the 20s.  Compare that to a 280,000 lb A300-600F with a whopping thrust to weight ratio of 0.43--the A300 should be able to hold well over 3000 fpm in this altitude range.  Something is way off in the FD thrust curves.

Also, the A/T stayed stuck in TOGA power no matter what was set in the TRP--it showed climb mode, and a target of 101.4% N1, and the throttles remained firewalled at 104.2%. 

 

[Deleted Account]

Thanks, will take a look

[w6kd]

I have not been able to duplicate the A/T stuck issue.

Is there a way to change the profile speeds in the FMS?  The default profile climb is setting a target of 325KIAS, where the manuals show 300/0.78 as the standard climb.  A climb with a manual 300/0.78 speed schedule produces better climb performance.

[chinjh]

15 hours ago, w6kd said:

I have not been able to duplicate the A/T stuck issue.

Is there a way to change the profile speeds in the FMS?  The default profile climb is setting a target of 325KIAS, where the manuals show 300/0.78 as the standard climb.  A climb with a manual 300/0.78 speed schedule produces better climb performance.

I got 310KIAS offered but this is with using cost index 0 but at a risk of putting your econ cruise below the green dot speed. Though i am not liking the idea of having to change the cost index for climb, cruise and descent.  Best outcome for climb once constrains are off is to use lvl chg.