Description of the issue: When at cruise and the aircraft is set to maintain cruise power the maximum attainable speed is ~25 knots below the targeted speed per the FMC.
FREQUENCY OF ISSUE
How often does this occur for you (Example: Just once, every time on sim load, intermittently)? Every time.
REPRODUCTION STEPS
Please list clear steps you took in order to help our test team reproduce the same issue:
Reach cruise altitude
Set power management setting to cruise (CRZ)
Set speed target to automatic/FMS
Observe the aircraft never achieving the targeted speed
YOUR SETTINGS
If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.
What peripherals are you using, if relevant: n/a
[PC Only] Are you using Developer Mode or have you made any changes to it? No
[PC Only] What GPU (Graphics Card) do you use? AMD Radeon RX 7900 GRE
[PC Only] What other relevant PC specs can you share? n/a
So grossweight of 47680 lbs is 21623 kgs, SAT of 2C at 14.000 ft is ISA +15C. According to QRH tables for 22T, the indicated airspeed should be 209 kts in cruise. Torque should be 71.5%.
From this photo you can see the torque target bug is missing in the simulator, and with power levers in the notch, the torque should go to the end of the green arc. So it seems the power is not set correctly with power levers in the notch.
In this real world example the weight is similar but at 16.000 ft and much closer to ISA (+7):
Literally at cruise, MAX throttle, TO power mode, and im not able to increase speed. If i keep throttle at MAX, and set power mode to CRZ (which i should theoretically be at during Cruise) i just lose a lot of speed, unable to keep up with cruise speed
It seems there is also a problem with climb performance. With throttles in the notch and power management set to CLB it will barely climb to FL100, climb rate below 500 ft/min…
We have created an internal ticket to see if our team already has this logged, and if not they will attempt to reproduce the issue and create a new bug report. This item is now marked as feedback-logged. If there is an existing bug report or one is created, we will move this thread to bug-logged.
Also need to understand that neither the 42, nor the 72 climbs above FL200 unless empty. It just doesn’t go that high. Not saying there isn’t an issue, at least for the 72, but anything above FL200 is not realistic.
I copied the first flight in the 2024 ATR 42 and made it to FL220, at around FL180 climb speed did start to decrease, and it continued to decrease, but I eventually made it.
It never stopped climbing all together it just slowed down to a crawl.
edit:
Looking at further history of the flights, most of the time it does FL200 to Montreal, and FL210 from Montreal. So maybe there were only a couple passengers onboard on the FL220/230 flights.
Yes FL200 is kind of the max it will do operationally (more so for the 72, the 42 has more performance). What do you mean with climb speed decreases? Climb is performed in IAS mode so 170 kts (160 for ATR 42) should be maintained by the autopilot.
Edit: I guess you meant the vertical rate? At the final stages less than 500 ft/min average is not unusual. ATR definition of climb ceiling is 300 ft/min average rate of climb or 100 ft/min in icing.
Service ceiling is 25,000 and that’s the max altitude it can attain with a climb rate of at least 100 fpm, so that doesn’t seem that far off if at all.
one problem i have, related to this, is my inability to positively ascertain what my actual gross weight is. i have seen three diferent values at the same time in the efb, the aircraft tablet and the fms
how do all three of these relate to each other, if they do at all, and how can one be sure of your actual GW in a scenario like this. The different measurement units add a little extra fun, there has been trouble with that before.
For example, in career mode, some planes fail to load so you fly super light, even though the efb is showing the a/c loaded.
it would help if we (the user) could check what actual GW the sim is seeing, what value its using to simulate flight (is there a way?, i dont know im not a power-user)
its possible we might all be overweight (in the sim i mean!)
Hmm, I’ll have to grab some screenshots but I’ve had good luck seeing everything match between the ATR EFB, the default EFB, and the MCDU. Sometimes things are off by a small amount based on fuel seemingly not converting kgs to lbs correcty (going to submit a separate bug for that) but ZFW especially tends to be bang-on the same between the three sources for me.
I can confirm this lack of power. And not just in cruise but in climb as well. At close to max gross weight, it takes 29 minutes to reach FL170 and then only achieves about 300 fpm after that. Should climb at about 1200 fpm and 17.5 mins to reach fl170. Also at cruise does not reach 200 KIAS as it should.
