Setting Additional Thrust Flashcards
Setting Go-Around Thrust
Option to select max available go-around thrust is always available at any point after V1 should the situation warrant it. This includes above thrust reduction altitude with the flaps still extended should it be felt that CON thrust is insufficient.
3 ways-
1) Disconnect the A/T and push the thrust levers forward.
This methods retains LNAV and VNAV thus makes it ideal for instances where we need strict adherence to the SID for terrain critical airfields (such as MROC).
However at 400’ the auto-throttle will re-engage and respect previous take off thrust so a second press of the disconnect switch will be needed so the thrust can once again be advanced. Once clean auto throttle can be re-engaged and ensure CON is selected.
2) Press TOGA
This is a good option when dealing with an engine failure at less challenging airfields. It will retain auto-throttle and give you TOGA thrust but it will disengage both LNAV and VNAV so crew will need to remember to re-engage them and verify with positive check if FMAs. If you don’t re-engage VNAV then you will have to increase speed on MCP to accelerate at Aa.
Note that TOGA mode is only available when flaps are out of up or when glide slope is captured.
3) Using FMC
GA thrust can be selected on INT REF > THRUST LIM page if the FMC. But do you really want to go heads down at 200’ - might not be appropriate for every phase of flight.
Setting Max Continuous Thrust
Setting Max continuous thrust in response to an engine failure is a viable option BUT ONLY for an engine failure above Aa to change the thrust from CLB back to CON.
2 ways -
1) using the CLB/CON button.
Button is inhibited on the ground and when below 400’. If the aircraft has sensed an engine failure then pressing the button will set CON thrust.
2) Using the FMC
Selecting CON on the THRUST LIM page of FMC. However again consideration should be given to not going heads down in FMC during critical phase of flight.
Summary
Engine failure BEFORE thrust reduction altitude -
1) Continue with take off thrust
2) Manually advance thrust levers forward
3) Press TOGA
Engine failure AFTER thrust reduction altitude -
1) Selecting CON thrust
2) Manually advance thrust levers forward
3) Press TOGA
