6.1   RUNWAY

The problem:

  • Runway operation frequency limits the number of slots

Possible constraints:

  • Airports may limit number of slots per airline 
  • Airports may introduce “flat” landing fees to discourage small aircraft 
  • Airports may ban “small” aircraft (limit around 100 seats)

Conventional solutions:

  • All aircraft to approach with same speed to maintain minimum distance
  • Aircraft to use high speed turn-off’s as available

Advanced solutions:

  • Smaller minimum distance between approaching aircraft
    • Improved flight control 
    • Improved ATC 
    • new vortex break up devices and detectors
  • High speed turn-off’s closer to end of runway
    • lower approach speed
    • better touchdown precision
  • Use secondary runway
    • lower approach speed for shorter landing distance
  • UHCA
    • Less aircraft needed for more people

Problems arising from the OHCA:

  • High runway loading
    • Bridges, tunnels underneath the runway
    • Runway on piers
  • High vortex generation
    • Big distance between UHCA and smaller aircraft
  • Aerodynamic and engine noise
  • Wing span
    • Other aircraft may not move if UHCA moves
    • Other aircraft may not be close to runway
    • Clearance between taxiways/runways
    • Clearance between two runways

Solutions for a UHCA:

  • Stabilise bridges
    • High weight cut off
  • Only big aircraft are allowed to start behind UHCA
    • Separation of aircraft
  • Folding wing
    • Tracking system on runway to allow closer distances to other objects
    • Wing tip collision warning system


An UHCA was born