I have seen while doing long haul flights, when you carry a lot of fuel, climbing straight away to FL380 isn't possible, the aircraft will stall somewhere around FL340. So I have to wait for like 5-15 mins, and then increase altitude by 1000ft and so on... nd you Slowly reach your Cruising altitude.

 

My question is, Is there any other way to find/calculate what FL is feasible for the current load, instead of waiting for that scary stall whistle?

There should be a climb performance chart for your aeroplane which you can use, these are usually in the back of the manual for the aeroplane. Typically these have you select the OAT, desired climb rate, weight etc, from a graph in order to determine what you need to know.

You should also bear in mind that there are regulations for commercial operations in various airspaces which govern this from a legal standpoint too. For example, the service ceiling for something like a big twin-engined prop in European airspace might be defined as the altitude where if both engines are running, the aeroplane is still able to climb at 300 feet per minute at its current weight for the local conditions i.e. the temp and pressure where the aeroplane is at the time.

Having worked out this data, most airliner crews will have a good idea of their step-climb plan for the route, although sometimes they might find ATC may not clear them immediately up to their next preferred step up, so you need to be aware of that too because it will impact on speed and fuel consumption.

 

Edited July 17, 20214 yr by Chock

7 hours ago, Chock said:

There should be a climb performance chart for your aeroplane which you can use

I am using project airbus A320-200(IAE)... and there was no manual with it, can you help me finding that Climb perf chart?

 

PS : FOUND IT! https://www.scribd.com/document/437654376/A320-Project-Airbus-Manual-CFM56-5B4#download

 

Thanks a lot @Chock

Edited July 18, 20214 yr by Dead

Just to add , on the real A320 the MCDU will also display the range of altitudes possible based on current aircraft conditions. Your Optimum and Max FL will be calculated and shown on the Cruise page of the MCDU based on the the weight of the aircraft at that time etc.

https://www.google.com/url?sa=i&url=http%3A%2F%2Fwww.a320dp.com%2FA320_DP%2Fnav-flight-management%2Fsys-14.4.2.html&psig=AOvVaw1VaexBK9m-nWzpnqlXeGcn&ust=1626673819554000&source=images&cd=vfe&ved=0CAsQjhxqFwoTCMCq7a_26_ECFQAAAAAdAAAAABAD

Not sure if the Project Airbus A320 has an MCDU simulated or not.

 

 

@787flyer Wow... I didn't know that, actually I don't fly FMC equipped acft too often... Project airbus don't come with MCDU...