Tow-2 Weapon Systems

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US ARMY TECHNICAL TEXTBOOK

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TOW2 WEAPON SYSTEM Subcourse Number MM4811 EDITION 9 United States Army Ordnance Missile and Munitions 8 Credit Hours Edition Date: July 1989 SUBCOURSE OVERVIEW This subcourse is designed to teach you the characteristics, purpose, and functional operation of the major assemblies and subassemblies of the TOW2 Weapon System. Contained within this subcourse are instructions on all assemblies and subassemblies to ensure the student understanding of the overall operation of the TOW2 Weapon System. There are no prerequisites for this subcourse. This subcourse reflects the doctrine which was current at the time the subcourse was prepared. In your own work situation, always refer to the latest publications. The words "he," "him," "his," and "men," when used in this publication, represent both the masculine and feminine genders unless otherwise stated. TERMINAL LEARNING OBJECTIVE TASK: You will identify the characteristics and state the purpose of: major assemblies, subassemblies, and associated Training Equipment, and the maintenance concepts used to support and train personnel for the TOW2 Weapon System. You will have the without supervision. subcourse book, and will work

CONDITIONS: STANDARDS:

You will answer 19 of 25 questions correctly for a passing score for this subcourse.

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TABLE OF CONTENTS Section Page

Subcourse Overview ..................................................i Lesson 1: Introduction to the TOW2 Weapon System.....................1 Practice Exercise.........................................16 Answer Key and Feedback...................................18 Lesson 2: TOW2 Functional Theory....................................20 Practice Exercise.........................................28 Answer Key and Feedback...................................30 Lesson 3: TOW2 Test, Measurement, and Diagnostic Equipment..........32 Practice Exercise.........................................41 Answer Key and Feedback...................................44 Lesson 4: TOW2 Training Set ........................................46 Practice Exercise.........................................57 Answer Key and Feedback...................................60 Lesson 5: TOW2 Maintenance Concept..................................62 Practice Exercise.........................................67 Answer Key and Feedback...................................69

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LESSON ONE INTRODUCTION TO THE TOW2 WEAPON SYSTEM. Soldier's Manual Tasks: 093-411-3911 093-411-3915 OVERVIEW TASK DESCRIPTION: Direct maintenance on the TOW2 Weapon System, test equipment, and provide technical assistance to TOW2 repairers. LEARNING OBJECTIVE: ACTIONS: When you have completed this lesson, you should be able to identify the purpose and function of the major assemblies and subassemblies of the TOW2 Weapon System. You will have this without supervision. subcourse book, and will work

CONDITIONS: STANDARDS:

Identify the purpose and function of the major assemblies and subassemblies of the TOW2 Weapon System in accordance with the information contained in this subcourse booklet. The material contained in this lesson was derived from the following publications. TM FM FM TC 9-1425-450-12. 23-24. 23-24 (Test). 23-23. INTRODUCTION

REFERENCES:

The TOW2 Weapon System is a crew-portable, heavy anti-tank assault weapon consisting of a launcher with tracking and control capabilities and the TOW (Tube-launched, Optically-tracked, Wire command-link) guided missile. The system is an all terrain, all weather, day or night system that is easily maintained and simple to operate. This lesson will identify the purpose and function of the major assemblies of the TOW2 weapon system. 1 MM4811

Facts about the TOW2 System. Two important features of the TOW2 weapon system are its mobility and simplicity of operation. The launcher consists of self-contained replaceable units. Assembly and disassembly of the launcher is accomplished readily in the field without the use of tools. The operational condition of the launcher system can be checked at any time it is assembled through the use of built-in self-test circuits (no external test equipment is needed). Units which fail the selftest are replaced at the operating site. The missile can be launched from a ground implacement or from a vehicle mount and is effective against armored vehicles and targets such as fortified emplacements. The tactical TOW2 weapon system (Figure 1-1) consists of eight major assemblies. These assemblies are the tripod, traversing unit, optical sight, launch tube, missile guidance set, battery assembly (2 ea), power conditioner, and night sight.

Figure 1-1.

TOW2 launcher System. 2 MM4811

Tripod. The tripod (Figure 1-2) is a heavy-duty, lightweight unit which provides ground-mounted capability for the TOW2 weapon system. Each tripod leg is adjustable and is secured with a leg lock. Flat tripod feet are adaptable to various types of terrain, and have anchor claws which allow the tripod unit to be staked when necessary. The tripod has three adjustable legs which allow the weapon system to be leveled and folded for easy transport. Two level vials (bubble level indicators) are used to level the tripod. A quick release coupling clamp provides installation or removal of the traversing unit. Friction locks provide an adjustment to secure the tripod in a level position.

Figure 1-2. 3

Tripod. MM4811

Traversing Unit. The traversing unit (Figure 1-3) consists of a large main housing and a trunnion device which serves as the mounting base for the launch tube and optical sight. The main housing is capable of revolving 360 degrees in azimuth (horizontal) plane, and the trunnion can elevate through an angle of 50 degrees in the elevation (vertical) plane (30 degrees above horizontal and 20 degrees below). Control knobs for use in tracking the target in azimuth and elevation are mounted on the sides of the main housing. The azimuth and elevation signals develop pitch and yaw position. The trigger is mounted on the righthand side of the main housing, just above the control knob. The molded cable, which transfers signals between the traversing unit and the guidance set (umbilical connector), is mounted in the cup underneath the main housing. The bridge clamp is mounted at the top of the trunnion device. This clamp secures the missile container in the launch tube, and provides electrical connection between the launcher and the missile.

Figure 1-3.

Traversing Unit. 4 MM4811

Optical Sight. The optical sight assembly (Figure 1-4) consists of an optical sight and an IR tracker assembly. Included in the unit are a boresight test and alignment capability. The gunner tracks the target through a 13 power optical sight. An eyepiece focus control allows the operator to easily adjust the focus of the eyepiece until the crosshairs are seen clearly. The tracker assembly in the sight/sensor receives infrared (IR) energy from the missile during the flight and senses any missile displacement from the tracker axis of line-of-sight. This information is used to generate the command signals which direct the missile toward the target. Boresight adjustments are used to obtain center-band readings for the boresight self-test. Out of band readings during the boresight self-test indicate that the line-of-sight of the optical sight is not properly aligned with the line-of-sight of the tracker assembly. A protective window in front of the lens systems seals out dust, dirt, and moisture for reliable operation. The optics unit attaches to the traversing unit by an over-center locking mechanism and an indexing plate with a floating plug to permit rapid engagement and connections. The optical sight provides a mounting surface interface for the night sight. No electrical (or other) connections are included at this interface. The night sight cabling is external to the launcher system. The optical sight compares the instantaneous line-of-sight to the target and establishes the amount of correction required by the missile at any moment during flight. The reticle light control illuminates the optical sight cross-hairs.

Figure 1-4.

Optical Sight. 5 MM4811

Launch Tube. The launch tube (Figure 1-5) is constructed of single-wall, laminated fiberglass and holds the encased missile on the launcher. The breech end of the launch tube is equipped with an anodized aluminum alloy fitting which permits rapid installation and removal from the traversing unit. The upper portion of the fitting contains two guide pins for indexing and holding the top of the launch tube breech to the traversing unit trunnion. The bottom of the fitting contains a steel latch pin which mates with the launch latch on the trunnion and locks the launch tube into position. The launch tube supplies the initial stability for the missile trajectory and protects the gunner from exhaust blast.

Figure 1-5.

Launch Tube.

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Missile Guidance Set. The missile guidance set (Figure 1-6) provides facilities for battery installation, and contains the electronic circuitry necessary to develop system operating voltages. It electronically converts information developed by the optical sight and traversing unit into missile steering commands. It consists of 20 printed circuit cards which are installed in the chassis assembly. The power supply assembly utilizes the DC voltage inputs from the battery assembly to develop the DC and AC voltages for system operation. Controls and indicators are provided on the guidance set front panel to select system operation mode and to perform a system self-test. The system self-test provides a visual indication of overall system operational performance by the use of the test-operate switch. Missile position signals, which provide the missile flig