69-Engines / Thrust Levers (12) Flashcards
(36 cards)
What controls the engines in all operating regimes?
- FADECs (Full Authority Digital Engine Controls)
What is the power source for the FADEC?
- The system has its own alternator making it independent of the aircraft electrical system when N2 is above10%
- If this alternator fails, the FADEC automatically switches to aircraft electrical power
The FADEC detects a fault during automatic start. What crew intervention is required?
- There is no crew intervention necessary. The FADEC will discontinue the start, dry crank to clear the fuel from the engine, and attempt a restart (if warranted) automatically.
How many igniters fire during a normal automatic ground start sequence?
- One igniter with the other serving as a backup
- The FADEC automatically alternates the igniters (A or B) at each start
How many igniters fire on manual or in-flight starts?
- Two, both A and B
On the ground, how can the A/THR be armed?
- By setting the thrust levers in the TOGA or FLEX gate (with a FLEX temperature inserted in the MCDU)
- At least one FD must be ON for A/THR to arm during takeoff
What is the active range of the A/THR?
- Just above IDLE to the CL detent (2 engines)
- Just above IDLE to the MCT detent (1 engine)
What determines the maximum thrust the A/THR system will be able to command?
- The thrust lever angle
What are three ways to disconnect the A/THR?
- A/THR pushbutton
- Instinctive disconnect pushbuttons
- Thrust levers to IDLE
What is the proper method of disconnecting A/THR?
- Set the thrust lever angle to the existing EPR and push the instinctive disconnect pushbuttons
How would the A/THR be disconnected for the remainder of the flight?
- Press & hold the instinctive disconnect pushbutton for 15 seconds.
*A/THR cannot be re-engaged and,
*ALPHA FLOOR is lost for remainder of flight
What happens to thrust and what annunciates on the FMA during ALPHA FLOOR?
- Thrust – TOGA
- FMA – “A.FLOOR”
When does the aircraft leave ALPHA FLOOR and what is the autothrust behavior?
- Upon reaching a lower angle of attack:
- Aircraft with Reversible Alpha Floor (FMS 2 Release 2):
- If the A/THR was active before ALPHA FLOOR mode
engagement, the thrust reverts to the A/THR mode which
corresponds to the current AP/FD. - If the A/THR was not active before ALPHA FLOOR mode
engagement, the thrust reverts to manual thrust. The level of thrust is set in accordance with the position of the thrust
levers.
- If the A/THR was active before ALPHA FLOOR mode
- All other aircraft:
- The FMA displays “TOGA LK” with a flashing amber box
- The TOGA thrust is frozen
What should the pilot do to get out of TOGA LOCK?
- Push the instinctive disconnect pushbuttons and move the THRUST LEVERS to the CL or TOGA detent, if not already that position
- Afterwards re-engage the auto-thrust
When will ALPHA FLOOR activate?
- When the aircraft AOA goes beyond the ALPHA FLOOR threshold
- It is predictive and considers the aircraft rate of deceleration and can be activated at any speed.
When would Thrust Lock occur?
- Thrust levers in CL detent and A/THR pushbutton on the FCU is pushed, or
- A/THR disconnects due to a failure
How is A/THR normally armed?
- By advancing the thrust levers to TOGA or FLX
What would be the normal FMA indications during a takeoff roll using FLEX thrust on a RWY with a localizer?
- MAN FLX, SRS, RWY, A/THR (blue)
What would the FMA indications be during a takeoff roll using TOGA thrust on a runway without a localizer?
- MAN TOGA, SRS, A/THR (blue)
What would the FMA indications be during takeoff roll if the A/THR didn’t arm on a runway with a localizer? Should the takeoff be aborted?
- SRS, RWY
- Continuing the takeoff is a safe option, but the thrust levers must be moved to the climb detent at thrust reduction altitude and the crew must manually engage A/THR.
How should A/THR be turned off?
*First, match the blue thrust lever angle indicators to the present thrust setting on the EWD and,
*Then push the instinctive disconnect pushbuttons or move THRUST LEVERS to IDLE.
What should the pilot do to get out of THRUST LOCK on aircraft without FMS2 installed?
- Move the thrust levers out of the climb detent
What controls the engine LP fuel valves?
- Engine MASTER switch
- ENGINE FIRE pushbutton
What does a FAULT light on the ENG panel indicate?
- The position of the HP fuel shut off valve is abnormal, or
- Auto abort of the engine start sequence, or
- There is a malfunction of the thrust control.