AT-5 A340E(Others) AUTOMATIC TRANSMISSION - OPERATION 2. FUNCTION OF COMPONENTS NOMENCLATURE | OPERATION O/D Direct Clutch (C₀) | Connects overdrive sun gear and overdrive carrier O/D Brake (B₀) | Prevents overdrive sun gear from turning either clockwise or counterclockwise O/D One-Way Clutch (F₀) | When transmission is being driven by engine, connects overdrive sun gear and overdrive carrier Forward Clutch (C₁) | Connects input shaft and front planetary ring gear Direct Clutch (C₂) | Connects input shaft and front & rear planetary sun gear 2nd Coast Brake (B₁) | Prevents front & rear planetary sun gear from turning either clockwise or counterclockwise 2nd Brake (B₂) | Prevents outer race of F₁ from turning either clockwise or counterclockwise, thus preventing front & rear planetary sun gear from turning counterclockwise 1st & Reverse Brake (B₃) | Prevents rear planetary carrier from turning either clockwise or counterclockwise No.1 One-Way Clutch (F₁) | When B₂ is operating, prevents front & rear planetary sun gear from turning counterclockwise No.2 One-Way Clutch (F₂) | Prevents rear planetary carrier from turning counterclockwise Intermediate Shaft Front Planetary Carrier Rear Planetary Carrier B₀ F₀ B₂ B₃ F₂ C₀ O/D Planetary Carrier F₁ C₁ O/D Input Shaft C₂ O/D Sun Gear Sun Gear Output Shaft Input Shaft B₁ O/D Planetary Ring Gear Front Planetary Ring Gear Rear Planetary Ring Gear Q02957 V02113