Chapter 18
Miscellaneous Tips

• When configuring, V_LS is more critical than V_FE, which in turn is more critical than manoeuvring speeds (S and F speeds). Both V_LS and V_FE are trustworthy with jammed flaps/slats.
• When configuring on approach, flaps do not begin to extend until conf 2 is selected.
• Slat position does not change between conf 2 and conf 3.

• Dual hydraulic failure fundamentals:

  • You will always need to gravity extend the gear, so you will never be able to retract it on the go-around.
  • If you only have blue, you lose the flaps; if you only have yellow, you lose the slats. The flaps/slats jammed procedure (including go-around modifications) is therefore incorporated into both these procedures.
  • If you only have blue or yellow, it will be a Direct Law landing; Normal Law is retained if green is available. Direct law is triggered by gear extension. If you only have blue, the ths is frozen, so you need to trigger Direct Law late (at conf 3, V_APP) to get neutral trimming of the elevators. If you only have yellow, the aircraft handling is sluggish; trigger Direct Law early (at 200kt) to improve responsiveness.
  • You’re going to need a longish runway. Worst case is if you only have blue, since you have, at best, accumulator braking and you’re coming in fast due to lack of flaps. Yellow is better since you have alternate braking, and its mainly about the lack of slats. If you have green, its not really all that bad.