AUTO FLIGHT - FLIGHT GUIDANCE Flashcards
The Flight Guidance (FG) provides the following functions:
‐ The Flight Director (FD)
‐ The Autopilot (AP)
‐ The Autothrust (A/THR).
The FG operates by using the following modes:
‐ AP/FD lateral modes to control the lateral trajectory
‐ AP/FD vertical modes to control the vertical trajectory, or the speed or Mach
‐ A/THR modes to control the speed or Mach, or the thrust.
FLIGHT DIRECTOR - FD ENGAGEMENT
MANUAL ENGAGEMENT
The flight crew manually engages the FD by pressing the onside FD pb.
Note: If the flight crew did not previously engage any AP or FD, then HDG or TRK, and V/S or FPA engage. The FD symbol flashes for ___.
10 s
FLIGHT DIRECTOR - FD ENGAGEMENT
AUTOMATIC ENGAGEMENT
ON GROUND
FD1 and FD2 automatically engage at ___
aircraft power-up.
FLIGHT DIRECTOR - FD ENGAGEMENT
AUTOMATIC ENGAGEMENT
IN FLIGHT
FD1 and FD2 automatically engage in flight, if:
‐ The flight crew engages the SRS GA mode, or
‐ The AP/FD TCAS mode engages upon a RA.
FLIGHT DIRECTOR - FD ENGAGEMENT
Note: On SRS engagement, if the flight crew previously selected the FPV/FPD display, the FD symbol reverts to
vertical and horizontal bars.
FLIGHT DIRECTOR - FD ENGAGEMENT
ENGAGEMENT ANNUNCIATION
If FD1 and/or FD2 engages, all the following events occur:
- FD pb on the FCU
- The xFDy message appears FMA
The PFD displays a yaw bar that replaces the roll bar in green below 30 ft radio height if a localizer signal is available during:
‐ Takeoff in RWY mode, or
‐ Landing in FLARE and ROLL OUT modes.
FLIGHT DIRECTOR - FD SYMBOLOGY - NON DISPLAY
The FD bars disappear, when one of the following occurs:
‐ The aircraft bank angle exceeds 45 °, or
‐ The aircraft pitch exceeds 25 ° up or 13 ° down.
The pitch bar disappears in ROLL OUT.
FLIGHT DIRECTOR - FD DISENGAGEMENT
If all FDs disengage while no AP is engaged, all the following occur:
‐ The lateral and vertical modes disengage, and
‐ If engaged, the A/THR reverts to (or remains in) SPEED or MACH mode.
FLIGHT DIRECTOR - FD DISENGAGEMENT
If all FDs disengage while at least one AP is engaged, all the following occur:
‐ The lateral and vertical modes remain engaged, and
‐ If engaged, the A/THR remains engaged in the current mode.
FLIGHT DIRECTOR - FD DISENGAGEMENT
AUTOMATIC DISENGAGEMENT
The FD disengages if, in ROLL OUT, the difference between the aircraft track and the runway track is more than
20 °.
FLIGHT DIRECTOR - FD DISENGAGEMENT
AUTOMATIC DISENGAGEMENT
DUE TO FAILURES
The FD disengages if one of the following occurs:
‐ The FD becomes inoperative, or
‐ The FCU is not available, or
‐ All the engines fail.
FLIGHT DIRECTOR - FD DISENGAGEMENT
AUTOMATIC DISENGAGEMENT
DUE TO SPEED PROTECTION
The FD disengages if no AP is engaged and the aircraft speed is either:
‐ below VLS in DES or OP DES, or
‐ above VMAX in CLB or OP CLB.
FLIGHT DIRECTOR - FD DISENGAGEMENT ANNUNCIATION
the flight crew disengages one FD, all the following occur:
The corresponding FD pb goes off,
The FD symbol no longer appears on the associated PFD,
1FD- appears on the FMA if FD2 is disengaged or -FD2 if FD1 is disengaged.
FLIGHT DIRECTOR - FD DISENGAGEMENT ANNUNCIATION
one FD fails, all the following occur:
All FD pb remain on,
Both PFDs display the guidance orders from the remaining FD, 1FD1 appears on the FMA if FD2 fails, or 2FD2 if FD1 fails.
FLIGHT DIRECTOR - FD WARNINGS
FD BARS FLASHING
The pitch bar (or FPV) flashes for 10 s and remains steady, if one of the following occurs:
‐ An automatic reversion to V/S (or FPA) mode occurs, or
‐ All APs and FDs are previously disengaged and the flight crew engages the FD.
FLIGHT DIRECTOR - FD WARNINGS
FD BARS FLASHING
The roll bar (or FPV) flashes for 10 s and remains steady, if one of the following occurs:
‐ An automatic reversion to HDG (or TRK) mode occurs, or
‐ All APs and FDs are previously disengaged and the flight crew engages the FD.
FLIGHT DIRECTOR - FD FLAG
If the guidance orders are not available while the FD is engaged, a FD flag appears on the PFD and the
FD bars disappear.
AUTOPILOT - GENERAL
The AP generates:
‐ Pitch, roll, and yaw orders
‐ The ___ angle.
nosewheel
The APs are available in ___ law, only.
normal and alternate
AUTOPILOT - AP ENGAGEMENT
One AP engages when the flight crew presses the AP1 pb or the AP2 pb on the FCU, and the aircraft is in flight for more than
5 s.
In BACK-UP NAV, the AP engages in selected modes if the ___ is available.
FG part
ENGAGEMENT OF BOTH APS
The second AP can engage only when one of the following conditions is applicable:
‐ LOC is armed, or LOC* or LOC is engaged, and
‐ G/S is armed, or G/S* or G/S is engaged
‐ Go-around is engaged.
When both APs are engaged, AP1 is active, and AP2 is on standby, regardless of the
order of AP engagement.
AUTOPILOT - AP DISENGAGEMENT
The APs disengages if one of the following occurs:
‐ The flight crew presses the takeover pb on the sidestick, or
‐ The flight crew presses the AP1(2) pb on the FCU, or
‐ The flight crew moves the pitch trim wheel beyond a certain threshold, or
‐ The flight crew moves a sidestick above a specific threshold, or
‐ The flight crew moves the rudder pedals above a specific threshold, or
‐ On ground, the flight crew sets all the thrust levers above the MCT detent.
Airbus recommends to press the sidestick pb ___ times to disengage both APs.
two
One time to disengage the APs, the second time to clear the associated AP OFF alert.
AUTOPILOT - AP AUTOMATIC DISENGAGEMENT
The APs automatically disengage, if one of the following occurs:
‐ One of the engagement conditions is lost, or
‐ During an approach with FINAL APP mode engaged, the aircraft reaches:
* The MAP, or
* The MDA/MDH -50 ft (if entered), or 400 ft AGL (if no MDA/MDH is entered).
In addition, in normal law with all protections available, the APs will disengage when:
‐ High speed protection activates, or
‐ Angle-of-attack protection activates, or
‐ Pitch attitude exceeds 25 ° up, or 13 ° down, or bank angle exceeds 45 °.
AUTOPILOT - AP DISENGAGEMENT ANNUNCIATIONS AND WARNINGS
DISCONNECTION VIA THE takeover pb
If the flight crew does not quickly press the takeover pb a second time, the following additional warnings will trigger:
‐ The cavalry charge audio indicators sounds, at high volume
‐ The AUTO FLT AP OFF alert is displayed on the WD.
AUTOPILOT - AP DISENGAGEMENT
If the AP disengages, without any flight crew action on the takeover pb, the following warnings will trigger:
‐ The AP OFF memo appears on the PFDs
‐ A cavalry charge audio indicator sounds, at high volume
‐ The AUTO FLT AP OFF alert is displayed on the WD.
AP/FD MODES - GENERAL
The AP/FD modes are either
lateral, vertical, or common.
Two types of AP/FD modes are available in order to guide the aircraft:
‐ Managed modes
‐ Selected modes
AP/FD LATERAL MODES
7 items
RWY
RWY TRK
HDG, TRK
NAV
LOC*
LOC
GA TRK
APP NAV
AP/FD LATERAL MODES
RWY
Runway mode
Mode used at takeoff to guide the aircraft along the runway center line using
LOC.
Triggered by the thrust levers at FLX or TOGA position.
AP/FD LATERAL MODES
RWY TRK
Runway Track mode
Mode used to guide the aircraft along the
track the aircraft was following at the mode engagement.
Triggered by the thrust levers at FLX or TOGA position.
AP/FD LATERAL MODES
HDG,TRK
Heading mode, Track mode
Mode used to guide the aircraft on a heading or a track selected by the flight crew. The target value is displayed in the FCU window.
HDG,TRK are called “basic modes” because it is a back up mode for certain situations :
‐ F-PLN discontinuity entry
‐ AP engagement with no FD ‐ Loss of F-PLN
‐ MCDU BACK UP NAV
AP/FD LATERAL MODES
NAV
Navigation mode
Mode used to guide the aircraft along the lateral F-PLN. Available above
30 ft after takeoff.
Automatically armed at takeoff unless HDG,TRK is preset.
In that case RWY TRK engages after takeoff.
AP/FD LATERAL MODES
LOC* / LOC
Localizer capture mode Localizer track mode
Mode used to guide the aircraft on
the lateral approach path (LOC approach path).
AP/FD LATERAL MODES
GA TRK
Go-Around track mode
Mode used to guide the aircraft along the track the aircraft was following at the mode engagement.
Triggered by the thrust levers at
TOGA with Slats/Flaps in at least CONF 1.
AP/FD LATERAL MODES
APP NAV
Approach Nav mode
Mode used to guide the aircraft on the lateral approach path.
Selected by pressing
APPR pb on the FCU; the mode that engages depends upon the selected approach in the F-PLN.
AP/FD VERTICAL MODES
14 items
SRS
OP CLB
CLB
EXP CLB
ALT*
ALT
ALT CST*
ALT CST
ALT CRZ*
ALT CRZ
OP DES
DES
EXP DES
V/S, FPA
G/S*
G/S
FINAL
AP/FD TCAS
AP/FD VERTICAL MODES
SRS
Speed Reference System mode
Mode used at
takeoff, or go-around to maintain SRS speed (V2, V2+10, VAPP…).
Triggered by the thrust levers at FLX or TOGA position.
Automatically disengages at ACCEL ALT, or when another VERT mode is engaged.
AP/FD VERTICAL MODES
OP CLB
Open Climb mode
Mode used to climb directly to the FCU selected altitude. These modes disregard all ALT CST. The A/THR is in ___
THRUST mode (CLB/IDLE)
The speed target may either be selected or managed. ALT mode is systematically armed. Altitude target is blue on the PFD.
AP/FD VERTICAL MODES
CLB
Climb mode
Mode used to climb towards FCU selected altitude along VERT F-PLN taking into account ALT CST. Available, only if NAV mode engaged. The A/THR is in ___
THRUST mode (CLB).
The speed target may either be selected or managed. If managed, SPD CST, SPD LIM, and HOLD SPD are taken into account.
AP/FD VERTICAL MODES
EXP CLB
This mode is used to increase the vertical speed by selecting ___
Green Dot speed in climb.
AP/FD VERTICAL MODES
ALT* ALT
Altitude acquire mode
Altitude hold mode
Mode used to maintain a level flight at the
FCU selected altitude.
AP/FD VERTICAL MODES
EXP DES
This mode is used to increase the vertical speed by selecting
0.80/340 kt in descent.
AP/FD VERTICAL MODES
V/S, FPA
Vertical Speed mode, Flight Path Angle mode
Mode used to guide the aircraft by a vertical speed, or a selected flight path angle.
Altitude target is blue on PFD. V/S-FPA is a basic mode.
AP/FD VERTICAL MODES
G/S* G/S
Glide Slope capture mode
Glide Slope track mode
Mode used to guide the aircraft along the final approach path (ILS)
Selected by pressing APPR pb on the FCU.
AP/FD VERTICAL MODES
FINAL
Final mode
Mode used to guide the aircraft along the final approach path (non precision approach)
Selected by pressing the FCU’s APPR pb. The mode engaged depends upon the selected approach in the F-PLN. Linked to APPR common mode (APPR pb).
AP/FD VERTICAL MODES
AP/FD TCAS
Mode used to guide the A/C in the case of TCAS RA
Automatically engaged when a RA is triggered.
AP/FD COMMON MODES
4 items
LAND
FLARE
ROLL OUT
FINAL APP
AP/FD COMMON MODES
LAND
Land mode
Common mode engaged below ___ RA during an automatic ILS
400 ft
AP/FD COMMON MODES
FLARE
Flare mode
Common mode which provides alignment to the runway centerline on the yaw axis, and flare on the pitch axis.
Engaged below ___ RA, based on the current vertical speed.
60 ft
AP/FD COMMON MODES
ROLL OUT
Roll Out mode
Mode used to guide the aircraft on the runway following an automatic landing.
FD roll out symbol is displayed on PFD at touch down.
AP/FD COMMON MODES
FINAL APP
Final Approach mode
Common mode including APP NAV and FINAL modes during non-precision approach.
Engaged only if APP- NAV mode and FINAL mode are already armed.
AP/FD MODE STATUS
- An AP/FD lateral or vertical mode can be ___
- An AP/FD common mode can either be ___
armed, engaged, or disengaged.
engaged or disengaged.
AP/FD MODES - SRS TO Mode
The SRS TO controls the speed via the ___, in order to steer the aircraft along a vertical path.
elevators
SRS TO Mode
The guidance law also includes:
‐ A flight path angle protection, that ensures a minimum vertical speed of 120 ft/min
‐ A pitch angle protection to reduce the aircraft nose-up (18 ° of maximum pitch attitude or 22.5 ° maximum in case of windshear).
‐ A speed protection limiting the target speed to V2+15 kt.
(When the aircraft is on ground, V2 is the speed target.
When the aircraft is airborne, V2+10 kt becomes the speed target.)
SRS TO Mode
If one engine fails, the speed target is the current aircraft speed at the engine failure detection.
However, the speed target is limited by
V2 and V2+15 kt.
SRS TO engages, when all of the following conditions are applicable:
‐ The aircraft is on ground
‐ The slats or the flaps are extended
‐ V2 is inserted in the PERF TAKEOFF page
If V2 has not been inserted, V/S mode engages ___
5s after lift-off on the current V/S value.
Note: When V2 is inserted, or SRS TO is engaged, the speed automatically becomes ___
managed
SRS TO mode disengages, when one of the following occurs:
‐ Automatically, at the GA ACCEL ALT, or if ALT* or ALT CST* mode engages (above 400 ft RA), or
‐ Another vertical mode engages.
Note: In Engine Out conditions, the SRS mode does not automatically disengage at
EO ACCEL ALT.
SRS TO reverts to OP CLB, when the FCU selected altitude is above the aircraft altitude, and the flight crew pulls the
SPD/MACH knob.
When the ___ is available, the RWY mode gives lateral guidance orders during takeoff, and initial climb.
LOC signal
RWY engages, if all of the following conditions are applicable:
‐ V2 is inserted in the PERF TAKEOFF page, and
‐ The aircraft is on ground, and
‐ The slats are extended, and
‐ The LOC is valid, and
‐ The LOC deviation is below 1/2 dot, and
‐ The aircraft heading is within 20 ° of the ILS
‐ An ILS is set, associated to the takeoff runway, and the difference between
the LS course and the runway heading, as inserted in the flight plan is less than 2 °
‐ No lateral mode is already engaged, and
RWY disengages, when one of the following occurs:
‐ The LOC is lost below 30 ft RA
‐ NAV is armed, and the aircraft reaches 30 ft RA: NAV engages
‐ NAV is not armed, and the aircraft reaches 50 ft RA: RWY TRK engages
‐ Another lateral mode engages
‐ The aircraft heading deviates from more than 20 ° from the ILS
The RWY TRK automatically engages at 30 ft RA, if all of the following conditions are applicable:
‐ The FMS flight phase is takeoff, and
‐ NAV is not engaged.
REVERSIONS TO HDG/TRK
Note: If a managed vertical mode was previously engaged, a selected vertical mode engages:
‐ If CLB was engaged, OP CLB engages
‐ If ALT CST, ALT CRZ, or DES was engaged, V/S/FPA engages
‐ If ALT CST was engaged, ALT engages.
HDG/TRK PRESET
The system has a HDG/TRK preset function for takeoff and go-around.
The set value remains displayed in the FCU HDG/TRK window until the flight crew
pulls the knob.
AP/FD MODES - CLIMB
REVERSIONS TO OP CLB
OP CLB also engages, when one of the following reversions occurs:
‐ CLB and NAV are engaged, and NAV disengages, or
‐ CLB is engaged, and the vertical flight plan becomes invalid, or
‐ CLB is engaged, and the FMS flight phase changes to the descent or approach phase, or ‐ EXP CLB is engaged and the flight crew pulls the SPD/MACH knob, or
‐ SRS TO, or SRS GA is engaged, the FCU selected altitude is above the aircraft altitude, and the flight crew pulls the SPD/MACH knob.
AP/FD MODES - CLIMB
OP CLB reverts to V/S/FPA, when the flight crew sets the FCU selected altitude
below the aircraft altitude.
When CLB is engaged:
‐ AP/FDs controls the speed/Mach target (selected or managed) through the
elevators
AP/FD MODES - ALTITUDE
The ALT* mode:
‐ Has an internal V/S guidance that is a direct function of the difference between
present altitude
and the altitude target
AP/FD MODES - ALTITUDE
The ALT* mode:
‐ Has an internal protection that decreases the vertical speed when
VLS or VMAX is reached (VLS or VMAX becomes the priority target)
The system switches automatically to ALT mode when the altitude deviation becomes less than ___
20 ft.
ALT arms, if one of the following conditions occurs:
‐ The difference between the aircraft altitude and the altitude set on the FCU is more than
250 ft.
ALT* reverts to V/S / FPA when the flight crew changes the FCU selected altitude by more than
250 ft.
If within 5 s after reversion to V/S / FPA, to confirm the altitude target change, the flight crew does not:
‐ Pull the ALT knob, or
‐ Set a new V/S / FPA target, or
‐ Push the ALT pb on the FCU.
Then:
‐ The triple click sounds
‐ The new guidance mode is boxed for 10 s
‐ The FD bars flash for 10 s.
The aircraft is at the altitude target when the difference between the aircraft altitude and the altitude
target is less than
40 ft for more than two seconds.