ATR power lever position versus FMA versus torque objective

Bug Reporting Hub Aircraft & Systems
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1

ISSUE DESCRIPTION

There seems to be a disconnect between power lever position (visually), the FMA indication and the power output.

  • Screenshot 1: with NOTCH-NOTCH on the FMA, the torque objective of 90% is not achieved.
  • Screenshot 2: with the power levers visually in the NOTCH, the torque objective is reached.

You might conclude that the power lever visual representation is the correct one and that the FMA is incorrect, but this is also not accurate:

  • Screenshot 3: with the power levers set to ground idle, the aircraft starts to move backwards, so ground idle is somewhere within the reverse range (the real aircraft will taxi forward at ground idle).
  • Screenshot 4: when selecting full reverse, the power levers visually don’t reach the end of travel.

So my conclusion is that everything it off. The ATR 72 being underpowered could be fully or partially explained by this perhaps? It doesn’t exactly help that the torque objective isn’t displayed (amber triangle) on the torque gauge (only for take-off it seems to be displayed):

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For take-off, torque objective should be in front of the take-off torque objective.

FREQUENCY OF ISSUE

Always

REPRODUCTION STEPS

For take-off, set NOTCH-NOTCH on FMA, observe take-off torque is not obtained.

Then set power levers visually in the NOTCH, observe take-off power is obtained.

Select ground idle, observe aircraft starts moving backwards (reverse range).

Select full reverse, observe power levers not reaching end off travel.

YOUR SETTINGS

Not relevant

MEDIA

NOTCH according to FMA (not obtaining torque target):

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Power levers visually in the NOTCH:

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But… power levers visually set to ground idle, aircraft is taxiing backwards, so ground idle is in the reverse range… (note the track diamond on the ND)

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Power levers don’t reach full reverse:

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Edit: for climb power the power levers need to be almost in RAMP position:

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2

Can confirm. I see the same issues.

3

Confirmed here also, same problem

4

can confirm

5

could this be the reason why the plane feels lacking in power?

6

I am quite certain about this. While in the NOTCH, take-off torque objective was reached. To obtain the climb torque objective, the power levers must be advanced well above the NOTCH. There should be a amber triangle to indicate the torque objective, this is only there for take-off for some reason. For climb, move the power levers forward until just outside the yellow arc.

Of course in real life you leave the power levers in the NOTCH and the PWR MGT selector will make sure the correct torque objective is maintained.

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7

very unfortunate that such a very particular characteristic of this a/c did not get the deserved attention, the whole power situation seems to be all over the place

8

I just checked, it is still well short of the cruise speed target and takes too much time to reach cruise. So while it helps, it is not the full solution.