BELL HELICOPTER 407 - STANDARD PRACTICES MANUAL

WHAT ARE THEY?...... The standard practices in aeronautical maintenance are procedures, standards and basic models that have been unified and welcomed by the regulatory authorities, manufacturers, maintainers and operators for the performance of any maintenance work on aircraft, other systems and aeronautical products.
1. WITH THE OBJECTIVE TO IMPROVE THE QUALITY OF THE WORK AND GUARANTEE THE SAFETY FOR THE OPERATION OF THE AIRCRAFT
2. HELP US TO STANDARDIZE PROCEDURES AND CRITERIA
3. WILL BE APPLIED IN THE MAINTENANCE OF THE AIRCRAFT BY CERTIFIED PERSONNEL
INTRODUCTION This manual contains maintenance information and procedures that are common to all Bell Helicopter models. Typical information includes standard torque charts and application procedures, corrosion control, painting, cleaning, nondestructive inspection, bonding, miscellaneous practices, bearing, sleeve and bushing inspection and replacement, storage, use of solvents, and consumable materials
1. THE USER IS WARNED TO NOT RELY ON BELL HELICOPTER DATA FOR PARTS AND PROCESSES NOT APPROVED BY BELL HELICOPTER
2. A list of consumable materials is contained in Chapter 13. This comprehensive listing provides a description, specification and suggested source
TORQUE VALUES Standard Torque — A general torque requirement that is applied when a specified torque is not identified in the applicable maintenance publication. Standard torque values are listed in Table 2-1 through Table 2-7. Unless otherwise specified, standard torque requires the addition of tare torque
1. When torques are specified in the applicable maintenance publication, they take preference over the standard torque values in Table 2-1 through Table 2-7
2. A non-specified torque does not have a torque value included in the maintenance publications. Torque values listed in Table 2-1 through Table 2-7 may be used as a reference
CORROSION CONTROL AND PROTECTIVE COVERINGS/COATINGS GENERAL There are many various forms of corrosion which attack metal and metallic materials causing early part failure. Several types of corrosion most common in aircraft are listed below
1. types of corrosion Galvanic Corrosion, Pitting Attack, Intergranular Corrosion, Exfoliation, Stress Corrosion, Fatigue Corrosion, Fretting Corrosion, Hygroscopic Material Corrosion.
  1. PROCTECTION AND TREATMENT CORROSION PREVENTIVE TREATMENT CORROSION PREVENTIVE OIL CORROSION PROTECTION — CONTROL BOLTS, ROTATING, AND NON-ROTATING CORROCION CORRECTIVE TREATMENT CORROSION REMOVAL — STEEL PARTS MATERIALS REQUIRED Refer to chapter 13 for specification and source
PAINTING Paint application corrosion preventive compound.
1. A clean surface is a surface that is not contaminated with oil, grease, fingerprints, etc.
2. Metal treatments intended to provide corrosion resistance, improve paint adhesion and/or alter surface condition of metal
3. MATERIALS REQUIRED Refer to chapter 13 for specification and source
CLEANING NOTE For detailed description of recommended cleaning agents, refer to Chapter 11. solvents
1. CARPET, HEADLINER AND TRIM PANELS, PLASTIC AND GLASS, USE OF HIGH-PRESSURE WASHERS, HYDRAULIC ASSEMBLIES AND, SERVICING UNITS, BEARINGS, METALS (EXCEPT TITANIUM), TITANIUM, TREATMENT OF FUNGUS, INSPECTION FOR FUNGUS, CLEANING OF FUNGUS.
NON-DESTRUCTIVE INSPECTION Non-Destructive Inspections (NDI) included in this chapter are fluorescent penetrant, magnetic particle, Eddy Current, and ultrasonic
1. NDI of a part or component of any assembly is required only when the Maintenance Manual or another Bell Helicopter Textron (BHT)
  1. NDI is to be accomplished when indications resulting from a visual inspection convey that a crack or other defect may exist and that further inspection
BONDING GENERAL RULES Material that may be bonded in accordance with these procedures are metal, plastic polycarbonate, silicone, and rubber parts
1. When necessary to mark detail parts or the location of bond areas prior to bonding
  1. Surfaces to be bonded shall be clean, dry, and free from oil or grease
MISCELLANEOUS PRACTICES
1. CLAMPING OF RIGID TUBES AND FLEXIBLE HOSES, CLAMPING OF RIGID TUBES AND FLEXIBLE HOSES — GENERAL PRACTICES, CONTROL TUBE (ADJUSTABLE), CONTROL TUBE (ADJUSTABLE) — THREAD PROTECTION, DE-ICING, ANTI-ICING, AND SNOW REMOVAL, DE-ICING, ANTI-ICING, AND SNOW REMOVAL — SNOW REMOVAL, ELASTOMERIC (RUBBER) PARTS.
BEARINGS, SLEEVES AND BUSHINGS
1. In this part of the manual we identify the part number of axial or radial bearings in inches for each identification and its limitations in different tables described by the manual
STORAGE
1. This section provides preparation procedures to place the helicopter in storage for a period of 6 months or less, and depreservation procedures to activate the helicopter after storage
  1. The procedure is divided into five categories of storage
    1. flyable storage, short term storage, intermediate storage, long term storage, and individual component storage
      1. which consists primarily of preventing moisture from contacting exposed material surfaces by the use of preservatives.
SOLVENTS
1. The solvent is a fluid that dissolves solids and liquids. solvents provided in Table 11-1. solvents are commonly used as cleaning agents
  1. Solvents can cause damage to internal organs (liver, kidneys, etc.) Refer to the Material Safety Data Sheet (MSDS) of the solvent
Chapter 12 has been deleted in its entirety at Rev. 1.
CONSUMABLE MATERIALS
1. Consumable material required to support Bell helicopters are listed in Table 13-1.

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