Wuestion on REDU TOGA

Capt. Pip

Hi,

How do you decide on REDU temp, on what it should be so to say?
And if I do a REDU takeoff, will pressing the TOGA clickspot activate that REDU TOGA or full TOGA?

Thanks in advance

Capt Pip

Mark

In the real aircraft, the flex temperature would be determined by a performance calculator on the EFB. This isn't something we have implemented in the simulator, but it is something we have logged on our internal feature request lists for a future update.

However, a fellow forum user 'galeair' has recently updated their "Aircraft Runway Performance Spreadsheet" to include flex calculations for the RJ: https://community.justflight.com/topic/7318/avro-rj-take-off-performance?_=1734948680241

With regards to the TOGA buttons, triggering TOGA will set whatever thrust has been selected on the TRP at the moment the buttons are pressed. So if you have TO REDU selected and the TRP is indicating an N1 SET value of 92.0%, triggering TOGA will set the engines to 92.0% N1 for takeoff.

Mark - Just Flight

smashingjonor

You can also use SimBrief to calculate a FLEX temp.
When you run the take-off calculation, it also provides a maximum temperature - this value can be used as your FLEX temperature.

The procedure I use is:

Get the max temp from SimBrief.
Set the bleed config as intended for take-off during the flight deck setup. This will cause the TRP to set an N1 value that will be the same as for take-off.
Make sure TO MAX is selected on the TRP.
Pull the N1 bug for engine 1. Bug 1 now has N1 REF (max thrust).
Select REDU on the TRP.
Enter the calculated FLEX temp
Pull N1 bug for engine 4.
Reset bleed and engine anti-ice as appropriate.

As part of the line-up items, after I've set the bleeds as needed for take-off, I compare N1 on eng 3 with N1 on eng 4.
Since we pulled the eng 4 bug with the planned take-off bleed config set, engine 3 and 4 should be the same (±0.1 is acceptable).
If engine 3 and engine 4 don't match, then either we've set the wrong bleed config for take-off or we messed up at the gate.

We also pulled the N1 bug for engine 1 while TO MAX was selected so this now shows us our maximum thrust for reference should we need it later.
If we make a last minute change and decide to use N1 REF for take-off, we can now crosscheck engine 1 with engine 2 using the same principle as above.

Capt. Pip

Awesome, thanks for the answers!