A320 NEO Open Climb Thrust Logic

[vilas]

Originally Posted by 321XLR

villas can you provide a "operational real world" scenario and walk us thru this ? Would a pilot watch N1, then pull selected speed?

isn't Airbus philosophy is "use the automation" ? In theory, open climb ignores constraints and "climbs unrestricted." Period, the end. Managed Climb, obeys contraints to include altitude and speed. Period, the end.

Is it basically safe to say that (this is why we go to recurrent....consider this a short refresh...) :

THR CLIMB/THR IDLE - "THR"-XXX in the FMA = FIXED THRUST. Speed controlled via PITCH

SPEED or MACH in the FMA = VARIABLE THRUST. Speed controlled by THRUST / POWER.

Example-1: Tracking the ILS on the glideslope, SPEED should be in FMA, as it should. You cannot have large pitch variations and track the glideslope. You are also slowing to VAPP.
Example-2: Level flight at FL350. MACH in FMA. Again, to maintain Mach number or Cost Index or whatever cruise speed, you cannot be changing pitch while in level flight.

Again

THR-xxx = FIXED THRUST
SPEED or MACH = VARIABLE THRUST

Correct ?

After pulling climb wait for aircraft to pitch up before pulling speed. There is another situation when FMA shows THR IDLE but it's higher than idle. It's when starting descent from TOD if there is repressurisation segment then it will use higher than idle thrust till it get into correct depressurisation profile. Basically what you say is correct.