*TM 1-1500-204-23-5Change 3 3-4.9f. Tail Rotor Gearbox. The tail rotor gearbox is lo-cated on the extreme aft end of the tail boom--in somecases on top of the tailboom vertical fin (Figure(3-3.I).The gearbox is splashlubricated. It consists of matinginput and output gear assemblies set into a case pro-vided with a vented oil filler cap, oil level sight gage, anda drain plug with a magnetic insert plug for collectingmetal particles. By analyzing these metal particles, thecondition of the gearbox gears and bearings can be de-termined. Flexible couplings are provided for attachingthe tail rotor drive shaft onto the input end of the gearbox.The tail rotor gearbox provides a specific degree changein tail rotor drive shaft direction and a specific speedreduction between input shaft and output shaft on whichthe tail rotor assembly is mounted.CAUTIONWhen troubleshooting or working on a specif-ic single--rotor power train system or compo-nent, always refer to the applicable mainte-nance manual.
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