BYPALS Flight Law Limits

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Author:
danandana
ID:
297998
Filename:
BYPALS Flight Law Limits
Updated:
2015-03-19 23:39:47
Tags:
Airbus A320
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Description:
Airbus Flight Law Limits
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  1. What does the BYPALS acronym/study aid mean?
    • Bank
    • Yaw
    • Pitch
    • Aoa
    • Load
    • Speed

    failure of 1 computer does not affect Normal Law, it takes Multiple Failures of Redundant Systems (MFoRS)
  2. First, some definitions:
    FOM III, 27.20.3
    FMGS Guide p.16
    • in order, as AOA increases (usually as speed decreases):
    • PROT - Alpha Protection Speed - in Normal Law, max AOA at which A Prot becomes active (top of black & amber strip), further nose-up trim inhibited
    • FLOOR - between A pro & A max, automatically sets GA thrust
    • MAX - max AOA acft can obtain in normal law (top of solid red strip)

    VSW - Stall Warning speed - displayed in Alternate or Direct Law as top of red & black strip

    • CL MAX
    • ~~~~~~~~~~~~~~~
  3. Describe the "B" in BYPALS:
    What is available in Normal, Alternate, Direct Laws?
    • Normal Law BANK Limits:
    • 33o - stops trimming, requires constant sidestick input
    • 45o - Flt Dir & Autopilot go away
    • 67o - maximum bank allowed
    • 40o - passing back through 40o, get FD back

    • Alternate & Direct Law Bank protections:
    • no protections
  4. Describe the "Y" in BYPALS:
    What is available in Normal, Alternate, Direct Laws?
    • Normal Law YAW functions:
    • yaw dampening
    • turn coordination

    • Alternate Law Yaw functions:
    • yaw dampening only

    • Direct Law Yaw functions:
    • mechanical rudder
  5. Describe the "P" in BYPALS:
    What is available in Normal, Alternate, Direct Laws?
    • Normal Law PITCH protections:
    • flaps 0-3:
    • 30o max nose Up, reduced to 25o at low speed
    • at 25o nose up, Flt Dir disappears, reappears through 22o
    • flaps full:
    • 25o max nose Up, reduced to 20o at low speed
    • all configurations:
    • 15o max nose Down (green "=" symbols)
    • at 13o down, Flt Dir disappears, & re-appears passing back thru 10o

    • Alternate & Direct Law Pitch Protections:
    • none
  6. Describe the "A" in BYPALS:
    What is available in Normal, Alternate, Direct Laws?
    Normal Law AOA protections:

    VMAX  -  maximum speed - low end of red & black strip (lowest of VMO or MMO or VLE or VFE)

    VLS  -  lowest selectable speed (top of an amber line along the airspeed scale)

     Prot  -  Alpha Protection Speed - in Normal Law, max AOA at which A Prot becomes active (top of black & amber strip), further nose-up trim inhibited

     Floor  -  between A pro & A max, automatically sets GA thrust

     Max  -  highest AOA you can get w/full aft sidestick, max AOA acft can obtain in normal law (top of solid red strip)

    • Alternate Law AOA protections:
    • VLS  -  lowest selectable
    • VSW  -  stall warning, top of red & black strip - show in Alternate or Direct Law

    • Direct Law AOA protections:
    • none
  7. Describe the "L" in BYPALS:
    What is available in Normal, Alternate, Direct Laws?
    • Normal Law LOAD protections:
    • clean   -1.0 to +2.5
    • w/slats/flaps  0 to +2.0

    • Alternate Law LOAD protections:
    • same as in Normal

    • Direct Law LOAD protections:
    • no protections
  8. Describe the "S" in BYPALS:
    What is available in Normal, Alternate, Direct Laws?
    • Normal Law SPEED protection:
    • VMO +6  -  two green "=" bars
    • VMO +16 
    • VMO +30

    • Alternate Law Speed protections:
    • stability? / varies

    • Direct Law:
    • no protections
  9. Describe the  prot protections:
    • Bank Angle to 45o
    • Autopilot Disconnects
    • Speed Brakes retract
    • Angle of Attack is proportional to sidestick deflation (AOA as opposed to Load)
    • Pitch (up) Trim is inhibited

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