flight idle B777
 

Hi

Could someone provide me with rough % N1 figures for flight idle (e.g. as in FLCH descent) and explain how they change with altitude.

Also, when does the approach idle kick in and what is the corresponding % N1 ?

Thanks

Adam

Whose donks are you talking about? :confused:

any one of them (GE, PW, RR Trent) rated around 90,000 lbs

On the Tent 892....

Minimum Idle is 54.0 according to the Propulsion Dats Limits page on the MAT. This was on the last flight I did. I'll check on the next flight if it changes. Approach idle is not a fixed value but keeps the engines unspooled. To quote from the manual, Approach idle is selected when either

1) Engine Anti-ice is ON
2) Flaps 25 or greater
3) One hyd sys pump ADP is inop with the flaps extended
4) Opposite engine bleed air valve is closed

Please do correct me if I am wrong.

Cheers