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Guidance
The pitch reference is :
~ V2 + 10 knots in normal engine configuration
~ the current speed or V2, whichever is greater, if the FMGS detects an engine failure.
The guidance law also includes :
~ attitude protection to reduce aircraft nose-up 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 pilot inadvertently sets on the FCU an altitude below
present altitude, the aircraft will remain in SRS mode until the pilot takes some
other action.
Typical FMA at takeoff with a Flex temperature
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃ ┃ ┃1.22.30 P 48 ┃
┃ ┃ ┣━━━━━┳━━━━━┫
┃I ~-~ A318 ┃l AFLIGHTIGUIDANCE ┃SEQ 100 1 ┃I REV 25 ┃
┃ aw aw ,, ~e~ A319 ┃ ┃ ┃ ┃
┃ Lli,~ A320 ┃ ┃ ┃ ┃
┃ A~7-~'M" A321 ┃ ┃ ┃ ┃
┃ FLIGHT CREW OPERATING MANUAL ┃ ┃ ┃ ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━┻━━━━━┻━━━━━┛
RUNWAY (RWY)
The RUNWAY mode has two submodes :
~ RWY mode, which gives lateral guidance orders during takeoff roll and initial climb out (up
to 30 feet 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 feet RA)
Engagement conditions
The RWY engagement conditions are :
- The conditions required for SRS mode engagement :
~ V2 is inserted in the MCDU PERF TO page
~ slats are extended.
~ the aircraft has been on ground for at least 30 seconds.
- 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 feet (RA) if NAV mode does not
engage (NAV not armed prior to takeoff).
Disengagement conditions
RWY mode disengages if :
- The LOC signal is lost below 30 feet RA or the aircraft heading and the runway
heading differ by more than 20~.
- Another lateral mode is engaged.
Note : If the takeoff runway has no ILS, RWY mode is not available and the PFD does
not display the yaw bar nor RWY on FMA.
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual2(59)
