ISO 2020-1:1997 pdf download.Aerospace Preformed flexible steel wire rope for aircraft controls Part 1: Dimensions and loads.
This part of ISO 2020 specifies the requirements which shall be satisfied by preformed flexible steel wire ropes for aircraft controls. The wire ropes shall be capable of operation within the temperature range of — 54 °C to +121 °C.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 2020. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 2020 are encouraged to investigate the possibility of applying the most recent editions of the standards Indicated below. Members of lEG and ISO maintain registers of currently valid International Standards.
ISO 2020-2:1997, Aerospace — Preformed ilexible steel wire rope for aircraft controls — Part 2: Technical specification.
ISO 2408:1985, Steel wire ropes for general purposes — Characteristics.
ISO 2532:1974, Steel wire ropes — Vocabular,.
6 Ropes
6.1 Construction
Wire ropes covered by this part of ISO 2020 are of the two types of construction shown in table 5.
6.1.1 7 x 7 construction
This type of wire rope shall be composed of six outer strands each of seven wires laid in a right-hand direction around a steel centre strand of seven wires.
The steel centre strand shall be composed of a layer of six wires laid in a right-hand direction around a core or king wire. It shall be of sufficient diameter to give full support to the outer strands.
The six outer strands shall be composed of a layer of six wires laid in a left-hand direction around a core or king wire. The lengths of lay shall be as follows:
The lengths of lay shall be as follows:
a) the six outer strands shall be closed around the steel centre strand with a length of lay between six and eight times the nominal diameter of the rope;
b) the inner layer of six wires of the steel centre strand and the outer strands shall have a length of lay of less than 60 % of the length of the outer layer;
c) the outer layer of the steel centre strand and the outer strands shall have a length of lay of less than 50 % of the length of lay of the rope.
For call-up purposes on drawings it is not normal to call up wire rope on its own as assemblies of wire rope and end fittings are usually shown. In this instance the designation in the list of parts need not show the length code.
9 Technical specification
Wire ropes in accordance with this part of ISO 2020 shall also meet the requirements of ISO 2020-2.ISO-2020-1-1997