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Flashcards in Auto Flight COPY Deck (40)
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How does the soft altitude mode work?

On reaching the planned cruise altitude  ALT CRZ engages and A/THR maintains the speed/mach target. Two minutes after ALT CRZ engages  if the mach mode is operative  SOFT ALT mode engages. This allows the aircraft to deviate +/- 50 feet from the target altitude  thereby minimizing thrust variations and reducing fuel comsumption.


When is the windshear detection function of the FAC active?

Takeoff - 3 seconds after liftoff up to 1300ft RA

Landing - 1300ft RA to 50ft RA with at least CONF 1 selected.


Which computer provides the windshear detection function?

The windshear detection function is provided by the Flight Augmentation Computer (FAC) in takeoff and approach phase.


What is the purpose of the yaw damping function?

Yaw damping stabilizes the aircraft in yaw (to prevent dutch roll) and coordinates its turns. In automatic flight (AP engaged) during takeoff and go around it assists rudder application after an engine failure (short-term yaw compensation).


How does the automatic speed protection in V/S or FPA mode work?

V/S mode normally targets V/S as a priority and sacrifices the speed target if it is unable to maintain that speed.  However, when you approach either the maximum or minimum speeds, the AP will give you the closest V/S it can give you whilst still maintaining a safe speed.


Min speed is VLS, or if VLS is the selected speed target, then VLS -5

Max speed is either VMO or VLE when flaps 0 or VFE+4 knots with slats/flaps out


When will the red AUTOLAND warning flash with a triple click aural alert?

At least one RA indicates a height below 200 ft, and at least one AP is engaged or armed with LAND or FLARE mode on the FMA with one of the follow -

  • The LOC deviation exceeds 1/4 dot and the aircraft is above 15 ft RA (the LOC scale flashes on the PFD)
  • The GLIDE deviation exceeds 1 dot and the aircraft is above 100 ft RA (the GLIDE scale flashes on the PFD)
  • Loss of LOC signal above 15 ft RA (The FD vertical bar flashes on the PFD)
  • Loss of GLIDE signal above 100 ft RA (The FD horizontal bar flashes on the PFD)
  • The difference between both RA indications is greater than 15 ft RA
  • The last autopilot disengages
  • The FMGS detects a long flare
  • The FMGS detects an untimely Flare condition.

Note - The FMGS detects an untimely Flare condition when one radio altimeter is inoperative, and the time between LAND engagement (measured radio height is below 400 ft) and FLARE condition (measured radio height is below 50 ft) is lower than 2 s.


The FMA annunciation 'A/THR in white' means?

The A/THR is active.


What is the energy circle?

The energy circle represents the required distance to land from the aircraft position down to airport elevation at VAPP speed considering all speed constraints of the vertical profile.


The Flight Guidance (FG) part of the FMGS controls the ...

Flight Director (FD), Autopilot (AP) and Autothrust (A/THR).


What is the definition of the Cost Index (CI)?

The CI is the ratio of flight time cost (CT) to fuel cost (CF). CI=0 corresponds to minimum fuel consumption (max. range). CI=999 corresponds to minimum time.


What does amber SPEED BRAKES mean on lower ECAM?

Speed brakes are extended and engines are not in idle.


How does the OPEN DECENT mode work?

The OPEN DECENT mode is a selected mode and maintains a SPD/MACH (selected or managed) with the AP/FD pitch mode while autothrust (if active) maintains IDLE thrust.


What is the MIX IRS position?

An average position from the three IRSs

Each FMGC receives a position from each of the three IRS's and computes a mean-weighted average called the 'MIX IRS' position.


Which elements are included in the flight management part of the FMGC?

Performance optimization (optimal altitude, economy descent speed etc) and flight predictions (distance, time, fuel remaining etc)


Which protection is not available below 100 feet AGL?

The alpha floor protection.


The FMA annunciation 'A/THR in blue' means...

The A/THR is armed.


Can you trim the rudder with the AP engaged?

No . When the AP is engaged the rudder trim knob is inoperative and the master FMGC sends rudder orders to the FAC.


What is the function of the rudder travel limiter?

This function limits rudder deflection as a function of speed in order to avoid high structural loads.


When will the Flight Directors (FD) automatically disappear?

When pitch exceeds 25° up or 13° down or bank angle exceeds 45°


On which page can you enter the ZFW on the MCDU when the engines are running?

On the FUEL PRED page.


What is the function of the Flight Augmentation Computer (FAC)?

The FAC controls rudder trim and yaw damper inputs, computes data for the flight envelope and speed functions, and provides warning for low-energy and windshear detection.


How many modes of operation does the FMGS have?

Three :

  • Dual mode (FMGCs talking to each other) - this is the normal mode
  • Independent mode (each FMGC is controlled by its associated MCDU)
  • Single mode (using one FMGC only)


On the ground, how do you arm the A/THR?

Setting the thrust levers in the TOGA or FLEX gate (when a FLEX temp inserted in the MCDU). At least one FD must be ON for the A/THR to arm during takeoff


If the FLEX TEMP is not entered on the TAKEOFF page of the MCDU, and the thrust levers are positioned in the FLEX detent, what will occur?

A warning will be generated - Continue to move the thrust levers to the TOGA detent and execute a max thrust takeoff


When can activate both autopilots

During an ILS approach


How do you confirm all autopilot, FD, and A/THR inputs?



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?

TLA - thrust level angle


What is the preferred method of disconnecting A/THR?

Set the thrust levers to match the current thrust level (move the doughnuts) and disconnect using the instinctive disconnect pushbutton


How do you disconnect the A/THR for the remainder of the flight?

Press and hold the Instinctive Disconnect button for 15 seconds