TMS buggy
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Hello Just Flight Team,
First of all i wish you guys a wonderful new year !
Im flying the BAE146 on the Xbox series X and noticed some wierd behaviour from TMS.
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If im in cruise and activate tgt on the TMS , lets say 700 and want to reduce further down lets say 650 the TMS will power off. I have to power on again the TMS.
More precise;
If TMS is in tgt mode and i Change the first number from tgt from 7 to 6 or 8 or vice versa the tms will instant power off -
If i use the TMS to apply flex thrust for Take Off, the engines will be limit to flex thrust ( around 92-94% n1 depends on Temperatur and altitude) the whole flight. Im not able to apply more trust than flex thrust even If i power off the TMS.
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Sometimes the TMS will show you N2 despite n1 is set to TMS even If im in sync modus. This happens most of the time during descend
Maybe you guys can look into it
Again Happy New year!
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Happy New Year to you too!
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This is the same logic as used in the real aircraft. As a change in the hundred digit can cause a significant reduction/increase in engine power, the TMS will return to its standby state if the hundred digit is changed. The pilot then needs to reselect TMS SYNC mode to engage it again.
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This isn't something we are able to reproduce, so can you confirm which TMS mode you are using to climb? If you remain in TO mode, then your N1 will be limited to whatever FLX has been used for takeoff. The normal modes used during climb for the TMS are SYNC, TGT, or TGT/SYNC mode, and these will allow effectively any N1% to be achieved.
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This is correct logic as when in DESC mode, the TMS will display the target core speed (N2) on the N%/℃ display and the engines will be speed-controlled to the computed N2 target value.
The TMS is a fairly quirky system that took us a while to get to grips with too, so we would recommend giving the TMS section of the manual a read so you can get the most out of the system (TMS sections starts at page 154): https://downloads.justflight.com/support/manuals/146_Professional_MSFS_manual.pdf
Mark - Just Flight
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Thank you for your Reply.
I will make an example for point 2.
I set tms to TO Mode ( lets say 92% n1) and take off in TO mode and for climb i engage SYNC Mode and reduce manual thrust to 88% and increase thrust for each 5000 feat altitude by 1% thrust more.
At 15000 feat i engage the TGT Mode at 820 for max climb Performance. But If i do this the tms will increase the thrust to Maximum 92% n1 ( Take Off thrust from start) and TGT is around 770 so it doesnt increase thrust more to reach TGT 820. Even If i turn Off the tms and increase manual thrust the engines wont Go higher than 92% n1 -
The engine parameters will vary depending on the local atmospheric conditions so the achievable TGT limits of the engines can vary from flight to flight. 820℃ may be achievable all the way up to cruising altitude on a warm day, but on a cold day, you may find you have to set an even lower TGT at low altitudes to keep the engines within their N1/N2 limits.
As a general rule of thumb, engine N1/N2 and TGT will also decrease as altitude increases due to the decrease in air density and temperature, which we suspect may be the behaviour you are seeing.
We hope that helps.
Mark - Just Flight
