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CHAPTER 4

TH-57B/C POWER TRAIN

4.1.

Identify the components of the TH–57 power train.

1.

Transmission

2.

Engine drive shaft (Barbell Shaft)

3.

Freewheeling Unit

4.

Forward short shaft

5.

Oil cooler fan driveshaft

6.

Aft short shaft

7.

5 tail rotor drive shafts

8.

Tail rotor gear box

4.1.1.

State the type of lubrication system utilized in the main transmission.

Wet sump, pressure lubrication system

4.1.2.

Identify the components of the main transmission oil system.

1.

Wet sump: Lower portion of transmission case (5 quart capacity)

2.

Oil Pump: Driven by transmission accessory drive (also drives Hydraulic power pack: pump and Nr tach Gen) mounted internally

3.

Oil filter Head Assembly:

a)

High Temp Sensor: 110oC  turns on caution Light

b)

Temp Bulb:   Sends signal to temp gauge on instrument panel

c)

Oil Bypass Valve: Bypasses filter when clogged

d)

Oil Monitor:  Magnetic screen type chip detector (not part of Chip detector Caution Light system.)

4.

Drain Valve: Self explanatory hopefully

5.

Oil Cooler: Radiator type cooler with temperature bypass feature when oil is cold.  Cooling air  supplied by the squirrel cage fan.

6.

2 pressure jets: Sprays oil on transmission gears and bearings.  A tee fitting between the two jets supplies oil to the freewheeling unit and sends oil to the wet line pressure gauge on the instrument panel and the low pressure switch.

7.

Oil pressure regulator:  Allows maintenance ot adjust oil pressure

4.1.2.1.

State the function of each component of the transmission oil system.

See 4.1.2

4.1.3.

State the location of the barbell shaft.

Between transmission and freewheeling unit

4.1.3.1.

State function of the barbell shaft.

Transmits power from freewheeling unit to transmission and has a flexible splined coupling on each end which gives it its barbell shape.  The flexibility if these couplings allows for momentary misalignment of the shaft, cause by movement of the transmission durring flight.

4.1.4.

State function and location of the freewheeling unit.  (AND)

4.1.4.1.

State the source of lubrication for the freewheeling unit.

11

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