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AFTER a 10‐hour direct flight a Boeing 707 had landed and clearance had been given to the stand. While the aircraft was travelling over a taxiway it was seen that a considerable quantity of unused fuel was being blasted rearwards by the jet efflux of No 1 engine. A ground operations vehicle driver also saw flames on the ground under the wing of the aircraft and informed the ground movements controller by radio who alerted the airport fire service. As the aircraft was turning to line up with the stand the captain called for No 1 and 4 engines to be shut down and later, for No 2 to be shut down. After the aircraft had halted he gave clearance for the emergency chutes to be disarmed and then continued with the normal shut down checks. Attention was however directed by someone outside to a ring of flames around the joint between thrust reverser cowling and the engine cowling of No 1 engine and flames also in the tail pipe area. Fire drill was immediately called for on No 1 engine.