lines 72 a and 72 b coupled to the fan sections 51 c and 51 d of the engines 46 c and 46 d which include pressure regulator shut off valves 73 a and 73 b mounted therein the lines 72 a and 72 b connect to a distribution duct 74 which provides high pressure air to ducts 76 a and 76 b and 76 c as previously stated at takeoff the engines are at full power and there is sufficient air at high enough pressure level that only fan air is necessary however upon landing where the engines are at a much reduced power setting it is necessary to provide additional air from the compressor sections of the engine to maintain pressure levels thus coupled to the distribution duct 74 are lines 79 a and 79 b having control pressure regulator valves 80 a and 80 b mounted therein which are connected to the compressor section 50 c and 50 d of the engines 46 c and 46 d therefore upon landing the valves 80 a and 80 b are opened duct 76 a connects to distribution channel 81 a which distributes air over the trailing edge outboard flap 36 b and part of flap 32 b duct 76 b connects to distribution channel 81 b which distributes air over the left inboard flap 32 b duct 76 c distributes air to distribution channel 81 c via a flow control valve 82 and pivoting connection 84 to right canard 24 b the valve 82 is used to control the airflow over right canard 24 b to very the lift produced thereby thus at takeoff the right and left canards 24 a and 24 b are extended with all engines 46 a.