F100 - ATS and Landing behaviour

pedropolak

Hello there, I was about to write something very similar.
First of all, and most important to me, it is noticiable how hard it is for the aircraft to maintain a constant IAS speed, that being via the ATS or via the level change.
In ATS part, thrust takes to long to be applyed or removed, resulting in IAS droping to low from the selected IAS, and while accelerating it takes to long for it to decrease the power, resulting the IAS to extrapolate +/-15kts over the selected speed.

I have also noticed the lack of agility from the aircraft to keep speed while in FLCH, that resulting in speeds al the way to 30kts below the selected altitude for descent (still need to try in climb mode).

pedropolak

CRZ LVL out of range was also something I've noticed, also still not knowing if that's a feature or bug, but I couldn't insert any Cruise Level below FL100.
I've tried to insert as FL080, 080, 8000, none worked.

Discovered that while short hopping and flying IFR paterns to practice this new airplane.

Mark

Thank you for your feedback. Tuning of various AFCAS and ATS modes is something that we anticipate will be a continual ongoing effort throughout the lifespan of the product. It is an area of the product that can vary so much based on a large number of factors, and now that the product is released and in the hands of an exponentially larger pool of users, it is only natural that we are going to find more of these scenarios that require further fine-tuning going forward.

I would just like to note, however, that slow throttle response and some throttle hunting are traits of the real aircraft. The following video is a good example of some throttle hunting during the approach phase: https://youtu.be/aqao0PWyLug

The slow throttle response in the real aircraft is also part of the reason why the landing gear takes 32 seconds to extend. We have cockpit videos from the real aircraft that show pilots controlling the throttles during the approach, even with ATS engaged, as it can sometimes not respond quickly enough. That's something that is very tricky to simulate in home flight simulators, as most users don't have servo-operated throttles that move with the throttle position in the simulator.

In terms of logging feedback, the very best thing that anyone could do is to collate all of your feedback and send it in a ticket to Just Flight Support via the following link: https://www.justflight.com/support

The F70 & F100 Professional are complex simulations, so in order to give our support team the best chance at offering speedy assistance, and to ensure that all feedback gets logged correctly, we would kindly ask that any screenshots/videos of the behaviour are also included with your ticket, as well as attaching the log file generated by the product.

Instructions for locating the log file can be found here: https://support.justflight.com/en/support/solutions/articles/17000152594-where-to-find-the-log-file-s-

Mark - Just Flight

pedropolak

Found the answers for that under the manuals
"The minimum accepted flight level is 10,000 ft."

jvtbalds

@Mark

Dear Mark,

Thank you for getting back to me and for sharing the reference video.

However, I would like to point out a few things regarding the video provided. Since it was recorded from the passenger cabin, it lacks the flight deck parameters (such as EPR, IAS trend, and wind vectors) necessary to make a direct and accurate comparison between the real aircraft's ATS behavior and the simulator.

Furthermore, the meteorological conditions in the video clearly show active weather, with nearby CBs and apparent turbulence. In an environment with shifting wind direction and speed, it is completely normal and expected for the ATS to make significant and continuous thrust adjustments to maintain the target speed.

This contrasts directly with the video I recorded and sent to you. In my simulator footage, you can see that the wind direction and speed are completely constant. While perfectly steady winds are too unreal, in this controlled environment, a stable wind vector should not trigger such erratic ATS responses and severe thrust hunting. Without external atmospheric disturbances, the system should be able to stabilize the power setting rather than continuously chasing the speed.

I'll sent a ticket as instructed!

Thank you again for your time and assistance.

Manrucavia

Dear team, thank you for yet another amazing aircraft !!! Just wanted to confirm this issue on my side as well. Plane is very much struggling to keep speeds, both in speed by pitch modes and in speed by thrust modes.

Damar_Rally

I have a different issue, on disengaging the ATS, it randomly turns back on again on finals!

Martyn

@Damar_Rally The ATS will automatically engage to provide low speed protection if you decelerate into the amber VMA speed band.

MichailusB

I would like to chip in here with my modest observation - this might be an issue occurring only on MSFS 2024, imho.

I flew F100 in MSFS 2024, LOWW-EPKK, the turbulence settings set to low and nearly no wind, the plane climbed in profile mode, was unable to follow FMS selected IAS. Oscillations were always +/- 20 kts. The throttle was stable in climb thrust, but the plane was unable to follow the FD properly and was overshooting the selected speed until a cruise altitude was reached.

I flew F100 in MSFS 2020, the same route, the same conditions, the plane kept the speed in profile climb without any issues (tiny variations due to the wind, absolutely normal).

I also flew F70, only in MSFS2020 on LOWW-LZKZ-LOWW, different cruise altitudes and speeds, always flown accurately. Did not fly F70 in MSFS2024.

The ATS is sometimes slightly sluggish, but as Mark says, that is to be expected, and I did not find the ATS behaviour in MSFS 2020 particularly problematic (would say that 737s by a famous developer have a similarly sluggish auto throttle).

Could it be the difference between simulators?

Damar_Rally

@Martyn thank you for the information, but I am well above the amber band by 10kts when this happens.