A320 Auto Flight System: Speed Reference System Quiz
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Questions and Answers

What color does the revision data appear in on both MCDUs and NDs?

  • Green
  • Yellow (correct)
  • Blue
  • Red

    • What happens when an entry of NEXT WAY POINT, NEW DEST, or VIA GO TO is made on the LAT REV page?

  • The SEC.F Plan page is selected on the MCDU
  • A temporary F-PLN is erased
  • The TEMP F.PLAN page is automatically displayed (correct)
  • The SECONDARY flight plan is activated

    • When can a TMPY F-PLN not be created?

  • When reaching cruising altitude
  • When landing is imminent
  • When descending below 10,000 feet
  • When a DIR TO is already in process (correct)

    • What prompt will be available when ACTIVATE SEC is selected with NAV mode engaged on FMGS?

    <p>ACTIVATE SEC</p> Signup and view all the answers

    What triggers the display of the TEMP F.PLAN page?

    <p>Making a revision on the LAT REV page</p> Signup and view all the answers

    When is a temporary F-PLN created?

    <p>When Active and secondary F-PLN have a common leg</p> Signup and view all the answers

    What is the basis of the managed speed profile?

    <p>ECON speed</p> Signup and view all the answers

    In what mode should the FMGS be to have the ACTIVATE SEC prompt available?

    <p>NAV mode</p> Signup and view all the answers

    What does pressing the 'AIRPORT' key do?

    <p>Erases a temporary F-PLN</p> Signup and view all the answers

    What does the FMGC compute once all vertical data has been defined?

    <p>Vertical profile and managed speed/Mach profile</p> Signup and view all the answers

    In what situations may the flight crew use the SECONDARY flight plan?

    <p>To plan a diversion only</p> Signup and view all the answers

    Where is a temporary F-PLN created after a revision?

    <p>On the F-PLN A pages</p> Signup and view all the answers

    What is the speed limitation in SRS mode if both engines are operating during takeoff?

    <p>V2 + 10 kts</p> Signup and view all the answers

    In SRS mode, what happens to the speed target if one engine fails during takeoff?

    <p>Speed target becomes highest of V2 or current speed, limited by V2 + 15 kts</p> Signup and view all the answers

    What protections are included in the SRS guidance law during flight?

    <p>Attitude protection, Flight Path protection, Speed protection, Best rate of climb</p> Signup and view all the answers

    When is the SRS active according to the text?

    <p>During Go Around up to acceleration altitude</p> Signup and view all the answers

    During takeoff, what is the maximum nose-up attitude reduction by the guidance law in case of wind shear?

    <p>30 degrees</p> Signup and view all the answers

    When is the SRS guidance displayed in takeoff mode according to the text?

    <p>V2 selected on FCU with extended flaps</p> Signup and view all the answers

    How can a pilot cancel a HDG/TRK PRESET?

    <p>Engaging NAV mode by pushing in the HDG/TRK knob</p> Signup and view all the answers

    When does RWY TRK mode engage during takeoff?

    <p>At takeoff power application if an ILS is tuned to a station corresponding to the departure runway</p> Signup and view all the answers

    When does OP CLB mode engage?

    <p>At acceleration altitude when CLB mode is disengaged</p> Signup and view all the answers

    What happens if the flight crew initiates a go-around below 100 feet?

    <p>HDG mode engages instead of TRK</p> Signup and view all the answers

    How should a pilot preset a heading of 210 degrees before takeoff?

    <p>Pulling the HDG knob to disarm NAV mode, setting 210 degrees, and pressing HDG knob to engage</p> Signup and view all the answers

    What lateral mode is available during takeoff before lift-off?

    <p>RWY TRK mode if an ILS is tuned to the departure runway</p> Signup and view all the answers

    What does the FMA display when the aircraft is descending in managed DES mode and is below profile?

    <p>THR IDLE / DES / NAV</p> Signup and view all the answers

    If the NAV mode is lost, what happens to the DES mode?

    <p>DES mode reverts to OP DES mode</p> Signup and view all the answers

    In which situation would the FMA change from DES/NAV to OP DES/HDG?

    <p>When aircraft enters F-PLN discontinuity</p> Signup and view all the answers

    If you select HDG while in THR IDLE / DES / NAV modes, what happens?

    <p>NAV mode will change to HDG and FMA will show THR IDLE / DES / HDG</p> Signup and view all the answers

    What happens if the aircraft is leveled above the FCU altitude with FD engaged in OP – DES mode and ATHR active?

    <p>ATHR maintains speed at VLS and FD stays in OP - DES mode</p> Signup and view all the answers

    During managed DESCENT, if the aircraft is above profile, what does the FMA display?

    <p>SPEED / DES / NAV</p> Signup and view all the answers

    Study Notes

    Revision Data Color

    • Revision data appears in magenta on both MCDUs and NDs.

    Actions on LAT REV Page

    • Entries of NEXT WAY POINT, NEW DEST, or VIA GO TO on the LAT REV page result in a temporary flight plan (F-PLN) being created.

    TMPY F-PLN Limitations

    • A temporary F-PLN cannot be created if the primary flight plan is still active without revisions.

    ACTIVATE SEC Prompt

    • The ACTIVATE SEC prompt is available when selected with NAV mode engaged on the Flight Management and Guidance System (FMGS).

    TEMP F-PLAN Page Display

    • The TEMP F-PLAN page is triggered by changes made to the F-PLN or when a temporary change is initiated.

    Creation of Temporary F-PLN

    • A temporary F-PLN is created whenever a new waypoint is added or a revision is made to the current flight plan.

    Managed Speed Profile Basis

    • The managed speed profile is based on optimal performance calculations considering aircraft weight, altitude, and environmental conditions.

    Required Mode for ACTIVATE SEC

    • The FMGS must be in NAV mode to have the ACTIVATE SEC prompt available.

    Function of 'AIRPORT' Key

    • Pressing the 'AIRPORT' key retrieves specific airport data and information pertinent to the current flight.

    Vertical Data Computation

    • Once all vertical data has been defined, the Flight Management Guidance Computer (FMGC) computes the vertical flight profile and constraints.

    Secondary Flight Plan Use

    • The flight crew may utilize the SECONDARY flight plan for alternate routing or in case of deviations from the primary flight plan.

    Temporary F-PLN Location Post-Revisions

    • A temporary F-PLN is created and displayed on the active F-PLN screen after a revision.

    Speed Limitation in SRS during Takeoff

    • In SRS mode, speed is limited to the V2 speed when both engines are operating during takeoff.

    SRS Speed Target on Engine Failure

    • If an engine fails during takeoff in SRS mode, the speed target adjusts to the lower V2 speed for safety.

    SRS Guidance Protection

    • SRS guidance law includes protections such as speed protection, vertical speed protection, and angle of attack protection during flight.

    SRS Activity Conditions

    • The SRS is active during takeoff and continues until a safe altitude is reached or significant changes in flight conditions occur.

    Maximum Nose-Up Attitude Reduction

    • During takeoff in case of wind shear, the maximum nose-up attitude reduction by SRS guidance law is typically 7.5 degrees.

    Display of SRS Guidance in Takeoff Mode

    • SRS guidance is displayed in takeoff mode until the aircraft transitions to the climb mode post-takeoff.

    Canceling HDG/TRK PRESET

    • A pilot can cancel a HDG/TRK PRESET by selecting the 'CANCEL' option on the flight control unit (FCU).

    RWY TRK Mode Engagement

    • RWY TRK mode engages automatically during takeoff as soon as the aircraft starts its takeoff roll.

    OP CLB Mode Engagement

    • OP CLB mode engages after takeoff when the aircraft has achieved a safe climb altitude and speed.

    Go-Around Below 100 Feet

    • If a go-around is initiated below 100 feet, the system retains airspeed and altitude to ensure safe maneuverability.

    Presetting Heading Before Takeoff

    • To preset a heading of 210 degrees before takeoff, the pilot turns the heading selector to the desired value on the FCU.

    Lateral Mode During Takeoff

    • The lateral mode available during takeoff before lift-off is typically the lateral navigation (NAV) mode.

    FMA Display in Managed DES Mode

    • When descending in managed DES mode below profile, the Flight Mode Annunciator (FMA) displays indications of descent path deviation.
    • If NAV mode is lost, the descent (DES) mode transitions to a heading-based descent (HDG) mode.

    FMA Change from DES/NAV to OP DES/HDG

    • FMA changes from DES/NAV to OP DES/HDG when lateral guidance is altered mid-descent due to navigation interruptions.

    HDG Selection in THR IDLE/DES

    • Selecting HDG while in THR IDLE / DES results in the flight director transferring control to follow the selected heading.

    Conditions Above FCU Altitude in OP DES Mode

    • If the aircraft is leveled above the FCU altitude with FD engaged in OP - DES mode and auto-throttle (ATHR) active, thrust is reduced to maintain altitude.

    Managed DESCENT Above Profile Display

    • During managed DESCENT if the aircraft is above profile, the FMA displays the current altitude as a cautionary indicator.

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    Description

    Test your knowledge on the Auto Flight System's Speed Reference System in the A320 aircraft. Mark the correct statements regarding the speed limitations and targets in different scenarios during takeoff and in SRS mode.

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