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Mounted to the front of the accessory gear box.  The freewheeling unit housing serves a an oil sump and holds the magnetic chip detector (not electrical and not part of the chip light system).  The freewheeling unit is composed of an outer race which is splined to Nf turbine output gear and an Inner race which connects to the Barbell shaft and Tail Rotor Drive Shaft.  Between the tow races is the sprag clutch which disconnects the power train from a failed Engine.

4.1.5.

Identify the components of the tail rotor drive shaft.

1.

Steel Forward Short shaft

2.

Steel Oil Cooler Fan Driveshaft

3.

Aluminum Aft Short Shaft

4.

5 Aluminum Tail Rotor Drive shafts

5.

Tail rotor Gear Box (Magnesium which changes direction of drive by 90 degrees and provides gear reduction from 6000 rpm to 2554 RPM (2.35:1)

4.1.5.1.

State the function of the tail rotor drive shaft.

Serves as part of the tail rotor drive train and as it turns it also turns the squirrel cage fan which in turn cools engine oil, transmission oil and hydraulic oil.

4.1.6.

State the two functions of the tail rotor gear box.

Changes direction of drive by 90 degrees and provides gear reduction from 6000 rpm to 2554 RPM (2.35:1)

4.1.7.

Identify the type of lubrication system utilized in the tail rotor gear box.

Self contained splash type. 3/8 pint capacity, contains an electrical ship detector wired to a T/R CHIP caution light.

12

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