Each manual control unit for a moving part of a thrust reverser is associated with a maintenance plate that is pivotable between at least two positions: a first or "normal operation" position in which said plate prevents the manual control unit with which it is associated from being driven manually, while allowing it to be driven electrically; and a second or "maintenance" position in which said plate allows the manual control unit with which it is associated to be driven manually while preventing it from being driven electrically.