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THE SYSTEMS ENABLING OBJECTIVES

From CNATRA P-402 (Rev. 7-98)

CHAPTER 1

INTRODUCTION TO THE TH-57

1.1.

Described the basic design characteristics and capabilities of the TH-57 helicopter.

Land-based, skid-configured, utility type helicopter, designed to land and takeoff from reasonably level terrain.  An Allison 250C-20J turboshaft engine powers the main rotor, which is used for lift and thrust, and the tail rotor, which is used to counteract torque and provide yaw control.  The maximum takeoff Gross weight is 3,200 lbs.  The maximum forward air speed at sea level standard day is 130 kts, maximum sideward airspeed is 25 kts and maximum reward airspeed is 15 knots.

Dimensions

Main rotor diameter:33’-4”

Main rotor to ground clearance:11’-7.5” / 6’-5”

Main rotor to tail boom clearance:1’-1.5”

1.2.

Recognize the five major sections of the airframe.

1.

Forward / cabin

2.

Landing gear

3.

Cowling

4.

Tail boom

5.

Vertical fin

1.2.1.

Recognize the items associated with the forward section.

Construction

Primarily constructed of aluminum honeycomb covered with either fiberglass or aluminum skin.  Provides excellent weight-to-strength ratio and also helps sound proof that cabin area.  

Battery compartment, windshield, control column, cockpit, passenger compartment, aft cabin deck, baggage compartment, aft electrical compartment, aft cabin space.

1.2.2.

Identify the components of the landing gear.

1.

2 aluminum alloy curved cross tubes

2.

2 aluminum skid tubes

3.

formed steel tail skid

4.

tow rings

5.

replaceable skid shoes

6.

ground handling wheels

1.2.3.

State the main purpose of the cowling section.

Streamlines air flow to reduce drag

1.2.4.

State the purpose of the tail boom, and identify its associated parts and their functions.

1

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