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# Introduction Power from the engines is combined in the main gearbox (MGB) and transmitted to the main rotor. The tail rotor drive shaft is driven from the MGB and transmits power through flexibly coupled shafts, an auxiliary gearbox, intermediate gearbox, and a tail rotor gear-box to the tail rot...

# Introduction Power from the engines is combined in the main gearbox (MGB) and transmitted to the main rotor. The tail rotor drive shaft is driven from the MGB and transmits power through flexibly coupled shafts, an auxiliary gearbox, intermediate gearbox, and a tail rotor gear-box to the tail rotor. The power from the MGB is also used for driving various accessories arranged in two distinct areas: LH & RH sides of MGB, which consists of hydraulic-pump drive, an alternator drive, and a lubricating pump drive. The complete transmission arrangement is shown in Figure 1-1. ## Assemblies of Transmission system (Figure 1-2) The transmission system consists mainly of: 1. Main gear box 2. Auxiliary gear box 3. Intermediate gear box 4. Tail gear box 5. Tail drive shaft 6. Anti-resonance isolation system (ARIS) In the following paragraphs, each of the transmission subsystems mentioned above is explained in detail.