A320 without A/THR
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Join Date: Nov 2001
Location: Toulouse, France
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A320 without A/THR
Hello !
I'm currently working on a pc simulation of airbus thrust systems, and am a bit confused by throttle operation when A/THR is disengaged.
If crew decide not to use A/THR, trust levers act as in a conventionnal a/c. Therefore, i suppose (correct me if i'm wrong) :
if you select CLB gate, you will obtain max CLB thrust for the actual conditions, and the same for TOGA gate.
but if you select FLEX/MCT, wich thrust will you obtain ?? does the FLEX power remains the same during all the flight ? very strange.
As a non-pilot, i probably missed important points about this.
Help would be great !
DD
I'm currently working on a pc simulation of airbus thrust systems, and am a bit confused by throttle operation when A/THR is disengaged.
If crew decide not to use A/THR, trust levers act as in a conventionnal a/c. Therefore, i suppose (correct me if i'm wrong) :
if you select CLB gate, you will obtain max CLB thrust for the actual conditions, and the same for TOGA gate.
but if you select FLEX/MCT, wich thrust will you obtain ?? does the FLEX power remains the same during all the flight ? very strange.
As a non-pilot, i probably missed important points about this.
Help would be great !
DD
Join Date: Jan 2002
Location: West Country
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From the Airbus Operations Manual:
THRUST CONTROL
MANUAL MODE
The engines are in the manual mode provided the A/THR function is:
When the thrust lever is in a detent, the corresponding EPR is equal to the EPR rating limit computed by the FADEC for that engine.
When the thrust lever is in the FLX/MCT detent:
- On the ground
The engine runs at the flex takeoff thrust rating if the crew has selected a flex takeoff temperature on the MCDU that is higher than the current Total Air Temperature (TAT). Otherwise the engine produces Maximum Continuous Thrust (MCT).
Note: A change in FLEX TEMP during the takeoff has no effect on the thrust.
- After takeoff
The pilot can change from FLX to MCT by moving the thrust lever to TOGA or CL, then back to MCT. After that, they cannot use the FLX rating.
Note: Setting the thrust lever out of FLX/MCT detent without reaching TOGA or CL detent has no effect
The pilot can always get MAX TO thrust by pushing the thrust levers all the way forward.
THRUST CONTROL
MANUAL MODE
The engines are in the manual mode provided the A/THR function is:
- not armed, or
- armed and not active (thrust lever not in the A/THR operating range and no alpha floor).
When the thrust lever is in a detent, the corresponding EPR is equal to the EPR rating limit computed by the FADEC for that engine.
When the thrust lever is in the FLX/MCT detent:
- On the ground
The engine runs at the flex takeoff thrust rating if the crew has selected a flex takeoff temperature on the MCDU that is higher than the current Total Air Temperature (TAT). Otherwise the engine produces Maximum Continuous Thrust (MCT).
Note: A change in FLEX TEMP during the takeoff has no effect on the thrust.
- After takeoff
The pilot can change from FLX to MCT by moving the thrust lever to TOGA or CL, then back to MCT. After that, they cannot use the FLX rating.
Note: Setting the thrust lever out of FLX/MCT detent without reaching TOGA or CL detent has no effect
The pilot can always get MAX TO thrust by pushing the thrust levers all the way forward.
