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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
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 automatically engages when the thrust levers are set to the TOGA or FLX/MCT
detent, or a derated level �� , providing:
V2 has been inserted in the MCDU PERF TAKEOFF ‐ page. If V2 has not been inserted, V/S
mode engages 5 s after lift-off on the current V/S value
‐ 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_20-60-40 GENERAL.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - TAKEOFF
A330/A340 FLEET DSC-22_30-80-20 P 2/4
FCOM 19 AUG 10
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
‐ 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_20-60-40 GENERAL.
Applicable to:
GUIDANCE
In SRS mode, the aircraft maintains a speed target equal to V2+10 kt in normal engine
configuration. When the FMGES 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 (15 ° or 22.5 ° maximum in
case of windshear)
Flight path angle protection that ensures ‐ a minimum climb slope of 0.5 °.
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.
Applicable to: ,
GUIDANCE
In SRS mode, the aircraft maintains a speed target equal to V2+10 kt in normal engine
configuration. When the FMGES detects an engine failure, the speed target becomes the highest
of V2 or current speed, limited by V2+15 kt.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - TAKEOFF
A330/A340 FLEET DSC-22_30-80-20 P 3/4
FCOM 19 AUG 10
The SRS guidance law also includes:
‐ Attitude protection to reduce aircraft nose-up effect during takeoff (17.5 ° or 22.5 ° maximum in
case of windshear)
‐ Flight path angle protection that ensures a minimum climb slope of 0.5 °
‐ 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
current altitude, the aircraft will remain in SRS mode until the flight crew takes some
other action.
RUNWAY (RWY)
Applicable to: ALL
GENERAL
The RUNWAY mode has two submodes:
‐ RWY mode, which gives lateral guidance orders during takeoff roll and initial climb out (up to
30 ft RA) if a LOC signal is available
‐ RWY TRK mode, which gives lateral guidance on the track the aircraft was flying at mode
engagement (at 30 ft RA).
ENGAGEMENT CONDITIONS
The RWY engagement conditions are:
‐ The conditions required for SRS mode engagement:
• V2 is inserted in the MCDU PERF TAKEOFF page
• Slats are extended
• The aircraft has been on ground for at least 30 s.
‐ The aircraft is receiving a LOC signal and LOC deviation is less than 1/2 dot
‐ The aircraft heading is within 20 ° of the ILS related course
‐ The ILS course is identical to the runway heading of the origin airport as selected for the active
flight plan, if any.
The RWY TRK mode engages automatically at 30 ft (RA) if NAV mode does not engage (NAV not
armed prior to takeoff).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
　
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