function SetFlapAngle {
  parameter angle.

  local flaps is getFlaps().
  if flaps:LENGTH = 0 { return. }
  for flap in flaps {
    flap:GetModule("ModuleControlSurface"):SetField("deploy angle", angle).
    print("DEBUG: Set flap angle to " + angle).
  }
}

function SetFlaps {
  parameter extend is true.
  local flaps is getFlaps().
  if flaps:LENGTH = 0 { return. }
  for flap in flaps {
    flap:GetModule("ModuleControlSurface"):SetField("deploy", extend).
    print("DEBUG: Set flap deployment to " + extend).
  }
}

function getFlaps {
  local flaps is SHIP:PartsTagged("flap").
  for flap in flaps {
    if flap:MODULES:Find("ModuleControlSurface") = -1 {
      print "WARNING: Flap is not a control surface. Aborting operation.".
      return List().
    }
  }
  return flaps.
}