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The rear portion 15a of an engine nacelle 15 supports the double visor members 16 of a thrust reverser, which are pivoted on pins 43 extending outwardly from the nacelle. In their inoperative position the visor members constitute the rear fairing of the nacelle. The visor members are operated by a pair of jacks 44 connected by rods 45 and levers 46, 47, to collars 48 mounted on the pins 43 and attached to the members 16.