Section I. Introduction and Description

TM55-4920-201-14

Section I

Introduction and Description

1-1. INTRODUCTIONS.

maintenance instructions as prescribed by the

maintenance allocation chart. Appendix A, References,

This technical manual contains operation and service in-

contains a standard list of all publications applicable to

struction for propeller balancing and adapter kits, part

this manual and available to operators and maintenance

numbers 7A050,7HEL053, AVSCOM kit AA4920-8503

personnel. Appendix B contains the maintenance alloca-

and the related supplementary adapter kits and

tion chart. This chart assigns maintenance functions and

repair operations to be performed at the applicable

miscellaneous parts listed in table 1-1. Sections I through

VII of this technical manual contain operation and

maintenance level.

Table 1-1. Marvel Kits and Parts Required for Balancing

Propellers and Helicopter Rotating Components

Covered in This Manual

FEDERAL

KIT OR

PART NO.

KIT AND PART NUMBER NOMENCLATURE

PART NO.

Kit, Propeller Balancing

4920-572-0987

7A050

Kit, Propeller Adapter

4920-679-9314

7A052

Kit, Propeller Spinner Balancing Adapter

4920-738-6788

7A055

Kit, Tail Rotor Balancing Adapter

7 H E L05 1

4920-572-0986

Kit, Tail Rotor & Fan Balancing Adapter

4920-623-5955

7HEL052

Kit, Small Parts Balancing

4920-623-5956

7HEL053

Kit, Main Rotor Balancing Adapter

4920-623-5957

7HEL054

Kit, Fan Track & Concentricity Checking

4920-623-5958

7HEL055

Kit, Optical Trammeling

4920-623-5959

7HEL056

Kit, Main Rotor Balancing Adapter

4920-536-8214

7HEL061

Kit, Tail Rotor Balance Positioning

4920-937-9418

7HEL065

Kit, Main Rotor Hub Balancing Adapter

7HEL066

4920-924-5708

Kit, Main & Tail Rotor Balancing Adapter

4920-111-3063

7HEL079

Kit, Main Rotor Balancing Adapter

7HEL354

4920-738-6788

Kit, Tail Rotor Balance Positioning

4920-168-9797

AA4920-8503

2586

Plate, Squaring

4920-536-8217

Tube, Assembly, 38" Length

4920-02l-7544

2769

Plate, Base

4920-902-5110

2792

Plate, Stand Adapter

2793

4920-902-5106

Adapter, Propeller Flange

4920-932-7697

2816

1-2. FORMS AND RECORDS.

1-3. REPORTING OF ERRORS.

Maintenance forms, records, and reports which are

Report of errors, omissions, and recommendations

for improving this publication by the individual

to be used by maintenance personnel at all

maintenance levels are listed in and prescribed by

user is encouraged. Reports should be submitted

DA PAM 738-751.

on DA Form 2028 (Recommended Changes to

Change 6

1-1