This Technical Specification specifies requirements for couplings of 2 in (50,8 mm), 2½ in (63,5 mm), 3 in (76,2 mm) and 4 in (101,6 mm) nominal sizes with ribbed tails and hexagons for use at pressures not exceeding 1 550 kN/m2 (225 lbf/in2). For assembly of coupling, see Figure 1.
This document is applicable to couplings which have been designed primarily for aircraft refuelling purposes, but they may also be used for other general purposes.

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This European Standard defines a range of cable outlets, straight, style A, for use under the following conditions:
Associated electrical connector(s)   :   EN 3660-002
Temperature range,   Class A   :   - 65 °C to 200 °C
   Class N   :   - 65 °C to 200 °C
   Class W   :   - 65 °C to 175 °C

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This standard describes the coding system for marks, the processes used to produce these marks, as well as the general marking requirements for the identification of aerospace engine items.
This document is applicable to items whose engineering drawing or design folder refers to EN 4301 for all issues that are not in contradiction with specific indications appearing on the engineering drawing or in the design folder.
This document is not applicable to items requiring an identification plate.

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This standard describes the coding system for marks, the processes used to produce these marks, as well as the general marking requirements for the identification of aerospace engine items.
This document is applicable to items whose engineering drawing or design folder refers to EN 4301 for all issues that are not in contradiction with specific indications appearing on the engineering drawing or in the design folder.
This document is not applicable to items requiring an identification plate.

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This standard:
-   describes the location and the layout of the marks of the item;
-   describes the marking processes to be used according to the environment and the function of the items;
-   determines the selection conditions of the marks;
-   determines the compatibility conditions of the marking processes with the constitution, the production and the use of the items.
This document applies to aerospace engine items and shall be used in conjunction with EN 4301.

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This standard:
-   describes the location and the layout of the marks of the item;
-   describes the marking processes to be used according to the environment and the function of the items;
-   determines the selection conditions of the marks;
-   determines the compatibility conditions of the marking processes with the constitution, the production and the use of the items.
This document applies to aerospace engine items and shall be used in conjunction with EN 4301.

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Specifies the basic dimensions and access clearance. The basic dimensions shall be as specified in figure 1. The clearance allowed around the connector shall be in accordance with figure 2.

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Includes a standard method for testing. The method specified and the limit value apply to all ground systems, fixed and mobile. Also, because these both are standardized, necessary knowledge is provided for aiding proper design of the aircraft fill control valve shut-off characteristics.

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Specifies the methods of numbering aircraft engines, engine cylinders and combustion chambers, on drawings, for example, and the methods of describing the direction of rotation of main shafts and rotors and or propellers. The numbering of engines is given for horizontal thrust engines, vertical thrust engines and take-off booster engines. The numbering of cylinders in piston engines is given for in-line piston engines and radial piston engines. Furthermore the numbering of components in turbine engines and in rotorcraft engines is given.

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