PWC37776 Pratt & Whitney Borescope Guide Tube

Pratt & Whitney Engine Guide Tube

PN: PWC37776

The first stage gear in a Pratt & Whitney engine refers to the first set of gears in the engine’s reduction gearbox. The reduction gearbox is a component that is used to reduce the high rotational speed of the engine’s output shaft to a lower speed suitable for driving the helicopter’s rotor blades or propeller.

In a turboshaft engine, like the Pratt & Whitney PW200 series, the first stage gear is typically a large, low-speed gear that is directly connected to the engine’s output shaft. The gear meshes with a smaller, high-speed gear that is connected to the reduction gearbox. As the output shaft rotates, the first stage gear drives the high-speed gear, which in turn drives the reduction gearbox.

The reduction gearbox is typically designed with multiple stages of gears, each of which further reduces the speed of the output shaft. The first stage gear is critical to the gearbox’s operation, as it transfers the torque and power from the engine to the gearbox and ultimately to the rotor blades or propeller.

The PWC37776 is designed for 4mm borescopes to inspect the 1st stage gear without the need for disassembly. This speeds up routine maintenance checks.

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