Forward thrust position Blocker doors Lock indicator light switch Air motor Vent Reverse thrust  select lever  (forward thrust) Screwjack Translating cowl Cascade vanes Power lever Flexible drive Gearbox Direction and speed control valve Flexible drive Flexible drive Lock and sequence valve Exhaust Selector valve Air motor unit Pressure regulator and SOV Blocker doors (folded) Feedback gearbox Fuel regulator Reverse thrust  select lever  (reverse thrust) Reverse thrust position Figure 3-49.  Components of a thrust reverser system.  3-30