TRIMM HORIZ STAB|ENG THRUST LEVERS Flashcards
How is the THS normally operated in flight?
The flight control computers control trim functions automatically
*THS Trimmable Horizontal Stabilizer
If NO hydraulic power is available can the THS be positioned?
No - the THS requires hydraulic power from the Green or Yellow systems
If a complete flight control computer failure occurs can the THS be positioned?
Yes, mechanical trimming is possible by manually positioning the Pitch Trim Wheel
Can you move the PITCH trim wheel if all systems are working normally?
Manual inputs have priority over computer inputs. The autopilot will disconnect
What happens to the THS when the aircraft enters into Ground Mode?
The trim automatically resets to zero (inside the green band)
What controls the engines in all operating regimes?
FADECs (Full Authority Digital Engine Controls)
What functions does the FADEC control?
a. Fuel metering
b. Engine limits based on thrust lever angle
c. Start sequencing
d. 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?
a. The system has its own alternator making it independent of the aircraft electrical system when N2 is above a set value
b. If this alternator fails the FADEC automatically switches to aircraft electrical power
When will the FADEC abort a start?
a. Hot start
b. Stalled start
c. No ignition
If the FADEC detects a fault during automatic start, is any crew intervention required?
No. 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?
a. Bleed demands
b. Approach Configuration
c. High engine or IDG temperatures
How many igniters fire on manual or in-flight starts?
Both A and B
When does continuous ignition automatically operate?
a. Engine flameout detection
b. Failure of the Engine Interface Unit (EIU)
What is the active range of the A/THR?
a. Just above IDLE to the CL detent (2 engines)
b. Just above IDLE to the MCT detent (1 engine)
What determines the maximum thrust the A/THR system will be able to command?
The position detent of the thrust lever
What are 3 ways to disconnect the A/THR?
a. Instinctive Disconnect buttons
b. Thrust Levers to IDLE
c. A/THR pushbutton
How do you disconnect the A/THR for the remainder of the flight?
Press and hold the Instinctive Disconnect Pushbutton for 15 seconds
What would you loose if you held down the Instinctive Disconnect Pushbutton for more that 15 seconds?
Alpha Floor Protection
What happens to thrust and what annunciates on the FMA when you reach Alpha Floor?
?
a. Thrust – TOGA
b. FMA – A.FLOOR
What occurs during Alpha Floor protection after speed increases above Vls?
FMA changes to TOGA LK
How do you regain normal A/THR when in TOGA LK or THR LK?
a. Move Thrust Levers to the TOGA detent
b. Press the Instinctive Disconnect button
c. Return Thrust Levers to CL detent
d. 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?
a. Thrust levers in CL detent and A/THR pushbutton on the FCU is pushed, or
b. A/THR disconnects due to a failure
What controls the engine LP fuel valves?
a. Engine MASTER switch
b. ENGINE FIRE pushbutton
What does a fault light on the ENG panel indicate?
a. Auto start abort
b. Switch disagreement between HP valve and its commanded position
