Preparing Holes For Fastening
Preparing Holes For Fastening
Preparing Holes For Fastening
AIPS01-02-003
Issue 5
Page 1 of 9
April 2010
AIPS
Airbus Process Specification
Copyright reserved
Ref. no. AIPS01-02-003
Contents
1 Scope
2 Normative references
4 Engineering Requirements
5 Process qualification
8 Rework
1 Scope
This Airbus Process Specification defines the requirements for Preparation of Holes in Metallic Materials for
Fastening.
The specification does not give detailed instructions; these are given in the Process Instruction (PI) / Airbus
Process Instruction (AIPI) and the work Instructions
It shall be applied when mentioned in the relevant standard, material specification or Definition Dossier.
2 Normative references
Only normative references cited in the text are listed hereafter.
The latest issue of the publication reference shall be used.
ABS1707 Hole Geometries for use with Protruding and Countersunk Head Bolts
AIPS 09-01-002 Cleaning with liquid non aqueous agents
AITM1-0070 Surface Roughness Measurements Using Surface Contact Stylus Method
EN 9103 Quality management systems – Variation management of key characteristics
3.2 Applicability
This Airbus specification is applicable when invoked by the drawing directly or through another document for the
purpose given in the scope. When processing to AIPS 01-02-003 is required, it shall be invoked on the drawing by
the words “Preparation of holes in metallic materials for fastening in accordance with AIPS 01-02-003”. Process
instructions shall not be called on a drawing.
The processes covered within this specification are drilling, reaming, countersinking and deburring of holes for
fastening operations.
3.3 Limitations of the process
Specific drawing conditions or conditions detailed in fastener specific AIPS documentation prevail over the
requirements quoted in this specification.
Holes produced by advanced or non-conventional processes may not yield the same level of fatigue performance
as those produced by conventional axial drilling and reaming operations. Where such processes are invoked tests
may be required to confirm the design fatigue life can be achieved. Reference shall be made in such cases to M&P
or the appropriate design authority.
4 Engineering Requirements
Engineering requirements are minimum requirements specified by Responsible Engineering to ensure optimal
performance of the manufacturing process.
100°±0.5°
100° + 0,5°
or 130°±0.5°
or 130° + 0,5°
CSK Center
LineCSK center
line
Hole center
line
F
ØD
4.1.1.6.2 One way assembly (drilling / reaming without the need to disassemble and deburr) shall only be applied
when it can be demonstrated by test and by first part qualification that part-to part-contact is maintained
throughout the drilling / reaming operation, that interface burrs at fastener positions do not exceed
0,05mm, and that the mechanical performance requirements of the joint can be met.
4.1.1.6.3 Burrs at hole exit (nut or collar seating) surface shall be removed where ever practical. Where it is not
practical to remove hole exit burrs they shall not exceed 0,10mm. In addition, where burrs are not
removed they shall not impede the ability to meet fastener seating requirements as defined in the
fastener specific AIPS.
4.1.1.6.4 Excessive chamfering of hole edges during deburring operations shall be avoided. Resultant chamfers
or radii at hole edges shall not exceed 0,20mm.
4.1.1.6.5 For hole edges at fastener seating surface refer to ABS1707 or fastener specific AIPS.
All process parameters shall be frozen at the point of qualification and appropriate process and quality controls put
in place to ensure no deviation from qualification agreed parameters. Any change to process or to qualification
agreed parameters shall be subject to validation via a full first part qualification.
4.2.3 Tooling / Equipment
All tooling / equipment shall be obtained from controlled sources and shall be certified as suitable for intended use
and conforming to the requirements of this specification.
4.2.4 Personnel
All operators shall be trained to perform the preparation of holes in metallic materials for fastening according to this
specification.
5 Technical qualification
The Technical Qualification shall be peformed according to the relevant Airbus Procedure.
Qualification trials shall include the preparation of holes in production representative materials across the full
diameter range and at stack thicknesses corresponding to the minimum and maximum thickness condition
expected in production. Sufficient tests shall be carried out to define and fix tooling and operational parameters,
and to demonstrate robust and repeatable compliance with the requirements defined in section 4 of this document.
All measuring equipment shall be suitably calibrated and shall be capable of measurement to an accuracy of 10%
of the tolerance defined in this specification.
Main objective of an FPQ is to prove, that the inner quality of a structural part / component meets the requirements
defined in the Definition Dossier, taking into account materials, key parameters of the manufacturing process and
tooling.
8 Rework
The reworking or oversizing of holes prepared in accordance with this specification shall be carried out under the
cover of non-conformance documentation.
RECORD OF REVISIONS
Clause
Issue Description of modification
modified
1 New standard
06/00