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associated knob. If, for example, they push in the HDG knob, they engage or arms the NAV mode.
‐ In order to engage a selected guidance mode, the flight crew turns the knob to set the desired
value, then pulls the knob out to engage the mode with a target value equal to the selected value.
Note: In managed guidance (lateral, vertical guidance or managed speed), the corresponding
window is dashed. Turning a knob without pulling it, displays a value that is the sum of the
current target and the turn action value. The display remains 45 s on the HDG/TRK and V/S
windows and 10 s on the SPD/MACH window before the dashes reappear. This rule does
not apply to the ALT knob/window.
SPEED/MACH CONTROL AREA
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
PILOT INTERFACE - FCU
A318/A319/A320/A321 FLEET DSC-22_10-40-20 P 4/10
FCOM 19 AUG 10
SPD/MACH knob
Display range: between 100 and 399 kt for speed, between 0.10 and 0.99 for Mach number.
One rotation of the knob corresponds to approximately 32 kt or M 0.32.
SPD/MACH pb
Pushing this pushbutton changes the SPD target to the corresponding MACH target and vice
versa.
LATERAL CONTROL AREA
Applicable to: ALL
HDG/TRK knob
Display range: between 0 ° and 359 °.
One rotation of the knob corresponds to 32 ° (1 ° per click).
LOC pb
Pushing this pushbutton arms, engages, or disengages the LOC mode.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
PILOT INTERFACE - FCU
A318/A319/A320/A321 FLEET DSC-22_10-40-20 P 5/10
FCOM 19 AUG 10
HDG V/S – TRK FPA pb
The flight crew uses this pushbutton to select HDG (associated with V/S) or TRK (associated with
FPA). Pushing it:
Displays the Flight Path Vector (FPV) on the Primary ‐ Flight Display (PFD) or deletes it.
‐ On the PFD, changes the FD crossbar display (with the aircraft attitude as its reference) to the
aircraft Flight Path Director (with the flight path vector as its reference) and vice versa.
‐ Changes heading reference into track reference in the HDG/TRK window and vice versa.
‐ Changes vertical speed reference target into flight path angle reference target in the V/S-FPA
window and vice versa.
AP-A/THR CONTROL AREA
Applicable to: ALL
AP1 pb AND AP2 pb
The flight crew uses these pushbuttons to engage or disengage the autopilots. The buttons
illuminate green when the autopilot is engaged.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
PILOT INTERFACE - FCU
A318/A319/A320/A321 FLEET DSC-22_10-40-20 P 6/10
FCOM 19 AUG 10
A/THR pb
The flight crew uses this pushbutton to arm, activate, or disconnect the autothrust (A/THR). This
button illuminates green if the A/THR is armed or active.
VERTICAL CONTROL AREA
Applicable to:
The FCU altitude window always displays a target value selected by the flight crew. It never displays
dashes.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
PILOT INTERFACE - FCU
A318/A319/A320/A321 FLEET DSC-22_10-40-20 P 7/10
FCOM 19 AUG 10
Altitude knob (INNER AND OUTER)
Display range: 100 to 49 000 ft
The outer knob ‐ has two positions: 100 and.
‐ The inner knob sets the altitude in the FCU window in increments of 100 or 1 000 ft, depending
upon the position of the outer knob.
EXPED pb
This pushbutton is used to engage the expedite mode. Refer to DSC-22_30-70-90 General.
METRIC ALT pb
This pushbutton is used to display the FCU altitude target in meters on the ECAM, or the current
altitude and FCU/FM altitude target in meters on the PFD �� .
V/S or FPA knob
Range (V/S) : –6 000 to +6 000 ft/min
2 clicks = 100 ft/min
If the flight crew turns the knob slowly, each click equals 100 ft/min.
Range (FPA) : –9.9 ° to +9.9 °
1 click = 0.1 °
The flight crew turns this knob to set the value of the vertical speed (V/S) or flight path angle (FPA)
to be displayed in the V/S or FPA window (They choose which, V/S or FPA, is to be displayed by
pushing the HDG V/S - TRK FPA pb).
One rotation of the knob corresponds to 32 clicks. One complete rotation sets:
FPA = 3.2 °
V/S = 1 600 ft/min
When the flight crew pushes in the V/S or FPA knob, the system commands an immediate level-off
by engaging the V/S or FPA mode with a target of zero. The flight mode annunciator (FMA) then
displays "V/S = 0" in green when V/S or FPA is nulled. If the flight crew now turns the knob to put
　
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