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FCOM 19 AUG 10
GENERAL
Applicable to: ALL
These modes are called “common” because they are related to both the lateral and the vertical axes.
The AP/FD common modes are:
On takeoff: Runway/Runway ‐ track associated to SRS vertical modes
‐ In approach: ILS approach (LAND) or non-ILS approach (APP NAV FINAL)
‐ In go around: Go around track associated to SRS vertical modes.
These modes are engaged simultaneously on both axes.
COMMON MODES VERTICAL LATERAL
TAKEOFF SRS RWY
RWY TRK
G/S*
G/S
LOC*
ILS LOC
APPROACH LAND, FLARE,
ROLL OUT
APPROACH
MODES
NON-ILS
APPROACH FINAL APP NAV
GO AROUND
(GA) SRS GA TRK
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - GENERAL
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_30-80-10 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - TAKEOFF
A318/A319/A320/A321 FLEET DSC-22_30-80-20 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Takeoff mode combines the SRS (Speed Reference System) vertical mode with the RWY lateral
mode. Both are simultaneously engaged, but may be disengaged separately.
Takeoff mode is available:
During the takeoff run and initial ‐ climb for FD bars guidance
‐ 5 s after lift-off for AP use.
SRS (SPEED REFERENCE SYSTEM)
Applicable to: ALL
GENERAL
The SRS mode controls pitch to steer the aircraft along a path in the vertical plan at a speed
defined by the SRS guidance law.
Applicable to: ALL
ENGAGEMENT CONDITIONS
The SRS mode engages automatically when the thrust levers are set to the TOGA or FLX/MCT
detent, providing:
‐ V2 has been inserted in the MCDU PERF TAKEOFF page
‐ The slats are extended
‐ The aircraft has been on ground for at least 30 s.
Applicable to:
DISENGAGEMENT CONDITIONS
The SRS mode disengages:
‐ Automatically, at the acceleration altitude (ACC ALT), or if ALT* or ALT CST* mode engages
(above 400 ft RA)
‐ If the flight crew engages another vertical mode.
Note: In Engine Out conditions, the SRS mode does not automatically disengage at EO ACC
ALT. Refer to DSC-22_20-60-50 GENERAL.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - TAKEOFF
A318/A319/A320/A321 FLEET DSC-22_30-80-20 P 2/4
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
DISENGAGEMENT CONDITIONS
The SRS mode disengages:
‐ Automatically, at the acceleration altitude (ACC ALT), or if ALT* or ALT CST* mode engages
(above 400 ft RA)
‐ If the flight crew engages another vertical mode
If the flight crew selects a speed while in SRS mode: ‐ SRS reverts to OP CLB mode, and a
triple-click aural warning is heard.
Note: In Engine Out conditions, the SRS mode does not automatically disengage at EO ACC
ALT. Refer to DSC-22_20-60-50 GENERAL.
Applicable to:
GUIDANCE
In SRS mode, the aircraft maintains a speed target equal to V2+10 kt in normal engine
configuration. When the FMGS detects an engine failure, the speed target becomes the highest of
V2 or current speed, limited by V2+15 kt.
The SRS guidance law also includes:
‐ Attitude protection to reduce aircraft nose-up effect during takeoff (18 ° or 22.5 ° maximum in
case of windshear)
‐ Flight path angle protection that ensures a minimum vertical speed of 120 ft/min .
Note: If during takeoff the flight crew inadvertently sets an altitude on the FCU below the
current altitude, the aircraft will remain in SRS mode until the flight crew takes some
other action.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - TAKEOFF
A318/A319/A320/A321 FLEET DSC-22_30-80-20 P 3/4
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
GUIDANCE
In SRS mode, the aircraft maintains a speed target equal to V2+10 kt in normal engine
configuration. When the FMGS detects an engine failure, the speed target becomes the highest of
V2 or current speed, limited by V2+15 kt.
The SRS guidance law also includes:
‐ Attitude protection to reduce aircraft nose-up effect during takeoff (18 ° or 22.5 ° maximum in
case of windshear)
‐ Flight path angle protection that ensures a minimum vertical speed of 120 ft/min
‐ A speed protection limiting the target speed to V2+15 kt.
Note: If during takeoff the flight crew inadvertently sets an altitude on the FCU below the
　
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