ENGINE ACCESSORIES. Those items which are required for complete engine operation, such as: starter, magneto, carburetor, induction system, exhaust system, propeller and propeller controls, all carburetor and engine controls and other items not an integral part of the engine are engine accessories.

EQUIPAGE. This term, for maintenance purposes, applies to airborne equipment other than accessories. Without equipage an aircraft could be operated as an aircraft. Equipage is not normally associated with a specific model of aircraft or engine. Examples of equipage are life rafts, parachutes, safety belts, survival equipment, portable fire extinguishers, flight clothing, armament and electronic equipment, and similar items.

OVERHAUL. As applied to engines, accessories, and equipage, this term indicates the disassembly of an engine, an accessory, or equipage to as thorough an extent as required to permit inspection of every com

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ponent part. Component parts which, upon inspection, will not meet requirements as set forth in the applicable specifications are restored or replaced by new parts so that after reassembly and test the engine or accessory or equipage will meet the requirements as set forth in the applicable specifications.

As applied to aircraft the term, overhaul, means the work accomplished on an aircraft and all of its component parts so that upon completion of overhaul the entire aircraft will be restored to a satisfactory operating condition as prescribed in the applicable specifications.

REPAIR. When applied to engine, accessories, and equipage, the term, repair, means the restoration of a damaged or non-operating engine, accessory, or item of equipage to the original operating condition without complete disassembly and inspection. If damage is so extensive as to require complete disassembly and inspection, the item shall be overhauled.

Aircraft repair on the other hand applies to the repair or replacement of specific defective parts of an aircraft. MODIFICATION. This term applies to additions, deletions, or changes to existing airframes, engines, or accessories so that the airframe, engine, or accessory will perform, or better perform, its intended function.

ROUTINE UPKEEP. This term applies to maintenance of aircraft by operational activities. This shall include inspection, adjustment, replacement, and correction of discrepancies or airframes, engines, and accessories when and as required. Repairs which may be accomplished by activities having Class C or lesser maintenance facilities shall be considered routine upkeep.

SERVICING. Servicing applies to the preparation of an aircraft for flight. Such preparation involves only the replenishment of the supply of consumable items such as fuel, oil, oxygen, food, water, air in tires, ammunition, bombs, etc.

TEST. This term applies to the subjection of an aircraft, airframe, engine, accessory, or item of equipage

to prescribed conditions to determine that it will function as it was designed or intended to function.

MAINTENANCE FACILITY. This term applies to available shop equipment, shop space or hangar space used for aircraft overhaul, modification, routine upkeep or servicing. The use of this term does not include personnel.

MAINTENANCE ACTIVITY. This term applies to available shop equipment, shop space, or hangar space used for aircraft overhaul, modification, routine upkeep or servicing, and the personnel required for its operation.

AIRCRAFT INDUSTRIAL ESTABLISHMENT. This term applies to naval aeronautical productive establishments which are organized along industrial rather than military lines. These establishments are equipped to perform aircraft overhaul and repair work on a large scale and of extremely wide scope. They are capable also of performing limited manufacturing work. Only Naval and Marine Corps maintenance activities designated as Class A are included in this definition.

CLASSIFICATION OF AIRCRAFT OVERHAUL, REPAIR,

AND MAINTENANCE ACTIVITIES

The degree of overhaul or repair work which may be performed by the aeronautical maintenance activity of a Naval or Marine Corps Air Station is limited by the classification of the maintenance activity. These classifications are defined in the following paragraphs.

Class A

The Bureau of Aeronautics controls the organization, policies, procedures, workloads, and civilian personnel complements of Class A aircraft industrial establishments. Military personnel complements are controlled by the Chief of Naval Operations based on recommendations of the Bureau of Aeronautics. By means of these controls, a Class A activity may be required to perform all the kinds of work for which facilities exist, or the degree

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of overhaul or repair work may be restricted to the kinds of work which will allow the Bureau of Aeronautics to meet its requirements schedule. Designation of this type of establishment must be approved by the Chief of the Bureau of Aeronautics and the Chief of Naval Operations.

Class A maintenance activities are aircraft industrial establishments located at major Naval or Marine Corps Air Stations and are provided with facilities for the following work on specific types as directed by the Bureau of Aeronautics.

1. Overhaul of aircraft and engines.

2. Repair to aircraft and engines.

3. Tests of aircraft and engines.

4. Modification to aircraft, engines and associated equipment.

5. Overhaul, repair and test of Class 265 material. 6. Manufacture of aircraft and engine component parts and associated equipment.

7. Engraving and graphic arts.

8. Tool and die manufacture.

9. Limited laboratory and engineering studies. 10. Engineering and prototyping of aircraft service changes as required by Bureau of Aeronautics. 11. Such other work as may be specifically authorized or directed by the Bureau of Aeronautics.

Class B

The Bureau of Aeronautics has delegated control of organization, procedures, and workloads of Class B maintenance activities to the commands in which the activities are located. Civilian personnel complements of this type activity are controlled by the Chief of the Bureau of Aeronautics and Chief of Naval Operations. Military personnel complements are controlled by Chief of Naval Operations based on recommendations of the Bureau of Aeronautics and the cognizant command. Aircraft, engines, and Class 265 materials, in the custody of