Engines - Thrust Levers Flashcards
What controls the engines in all operating regimes?
• FADECs (Full Authority Digital Engine Controls)
What functions does the FADEC control?
• Fuel metering• Engine limits based on thrust lever angle• Start sequencing• Provides engine indications and thrust limit displays on the E/WD
What redundancy does the FADEC have?
• Dual channel redundancy – one channel is active while the other is standby.
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
When will the FADEC abort an automatic start?
• Hot start• Stalled start• No ignition
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, clear the engine, and attempt a restart (if warranted) automatically.
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, clear the engine, and attempt a restart (if warranted) automatically.
When does the FADEC command a higher engine idle speed?
• Bleed demands• Approach configuration• High engine or IDG temperatures
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 and B) at each start
How many igniters fire on manual or in-flight starts?
• Two, both A and B
When does continuous ignition automatically operate?
• NEO Aircrafto Engine flameout detectiono Failure of the EIUo In-flight unscheduled sub idle or surgeo Master switch cycled from ON to OFF then back to ON position• Non-NEO Aircrafto All of the aboveo Engine anti ice ONo Approach idleo MAX/FLEX power selected
What are the 5 detent positions of the thrust levers?
• TOGA – Take Off/Go Around• FLX / MCT – Flex/ Maximum Continuous Thrust• CL – Climb• IDLE – Idle• MAX REV – Maximum Reverse Thrust
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 is the normal operational position of the thrust levers when A/THR is active?
• The CL detent
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 preferred 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 and hold the instinctive disconnect pushbutton for 15 seconds. The A/THR cannot be re-engaged once this is done. ALPHA FLOOR is also lost if this is done.
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 does the FMA change to?
• Upon reaching a lower angle of attack. The FMA changes to “TOGA LK”
Following ALPHA FLOOR, how would the crew return normal A/THR function?
• Press the instinctive disconnect pushbutton• Return thrust levers to CL detent• Push the A/THR pushbutton to engage A/THR
When is ALPHA FLOOR protection active?
• From lift-off through 100 feet RA on approach
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
