BS EN 2576:2020 pdf download

BS EN 2576:2020 pdf download.Aerospace series— Bolts, MJ threads, inheat resisting steel FE-PA2601 (A286)一Classification: 900 MPa (at ambienttemperature)/650 C—Technical specification.
3.1
batch
quantity of finished parts, of the same type and same diameter, produced from the same material obtarned from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments
3.2
inspection lot
quantity of parts from a single production batch of the same part number which completely defines the parts
3.3 Surface discontinuities
3.3.1
crack
rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character
3.3.2
seam
longitudinal surface discontinuity in the form of an unwelded open fold in the material
3.3.3
lap
surface discontinuity caused by folding over metal fins or sharp corners and then rolling or forging them into the surface
3.3.4
Inclusion
non-metallic particles originating from the material manufacturing process
Note I to entry: These particles may be IsoLated or arranged in strings extending longitudinally.
3.4
test temperature
ambient temperature. unless otherwise specified
3.5
simple random sampling
the taking of n Items from a population of N items in such a way that all possible combinations of
n items have the same probability of being chosen
3.6
critical defect
defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item
3.7
may or defect
defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its Intended purpose
3.8
minor defect
defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specltlcation having little bearing on the effective use or operation of this product
3.9
sampling plan
plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision
3.10
limiting quality
LQ10
quality level in a sampling plan which corresponds to a specified and relatively low probability of acceptance, in this case 10% probabIlity of acceptance
Note Ito entry: It is the limiting lot quality characteristic that a lot of this quality would occur.
3.11
acceptance quality limit
AQL
quality limit which in a sampling plan corresponds to a specified but reLatively high probability of acceptance
Note I to entry: It is the maximum per cent defective (or the maximum number of detects per hundred units) that, for purposes of sampling Inspection can be considered satisfactory as a procesa average.
3.12
finished bolt
bolt ready for use. Inclusive of any possible treatments and/or surface coatings. as specified In the product standard or definition document
3.13
defInition document
document specifying all the requirements for finished bolts
4 QualIty assurance
4.1 QualIfIcation
The qualification procedure for aerospace standard products (e.g. according to EN 9133 or an equivalent aerospace accepted and established qualification procedure) shall be used and documented according to the specified tests if not otherwise agreed between customer and supplier.
Qualification Inspections and tests (requirements, methods, number of bolts) art’ specified in Table I. They shall be carried out on:
— each type and diameter of bolt;
— 25 bolts selected from a single inspection lot by simple random sampling,
The test programme may possibly be reduced, or the qualification of a bolt be granted withoutinspection or testing: any such decision shall be based on the results obtained on similar types anddiameters of bolts provided that the design and manufacturing conditions are identical.
Table 2 indicates the allocation of bolt samples for the inspections and tests.
4.2Acceptance
4.2.1 Purpose
The purpose of acceptance inspections and tests is to check, as simply as possible, by a methodrepresentative of actual use conditions, with the uncertainty inherent to statistical sampling that thebolts constituting the batch satisfy the requirements of this standard.
4.2.2Conditions
Acceptance inspections and tests (requirements,methods,number of bolts) are specified in Table 1;they shall be carried out on each batch. Bolts from the batch to be tested shall be selected by simplerandom sampling.
Each bolt may be submitted to several inspections or tests.