Document ID: chunk:federal_register_of_legislation:F2011C00880:body:0:p1
Version: federal_register_of_legislation:F2011C00880
Segment Type: other
Provision Reference: 
Character Range: 0–3612

Civil Aviation Order 108.8 (as amended)

Process control — magnetic particle inspection

made under subregulations 38 (1) and (2) of the Civil Aviation Regulations 1988.

This compilation was prepared on 24 October 2011 taking into account amendments up to Civil Aviation Order 108.8 Amendment Instrument 2011 (No. 1).

Prepared by the Legislative Drafting Branch, Legal Services Division, Civil Aviation Safety Authority, Canberra.

Contents

    Page
1...Application............................................................
2...Definitions.............................................................
3...Equipment............................................................
4...Materials..............................................................
5...Procedures............................................................
6...Control of equipment and materials...........................................
7...Demagnetisation after inspection............................................
 Appendix I.............................................................
 Appendix II............................................................
 Appendix III............................................................
 Note to Civil Aviation Order 108.8 Instrument 2007

1 Application

       1.1This Civil Aviation Order specifies procedures relating to the inspection of aircraft, aircraft components and aircraft materials for flaws by magnetic particle methods, and is applicable in such circumstances as may be directed by the Director or an authorised person under the Civil Aviation Regulations 1988.

2 Definitions

       In this Order:

       continuous method means any method of magnetic particle inspection in which magnetic particles are applied to a part immediately before and during magnetisation, the application being stopped before the magnetising force is removed.

       dry method means any method of magnetic particle inspection in which magnetic particles are applied to a part as a dry powder.

       residual method means any method of magnetic particle inspection in which magnetic particles are applied to a part which has been magnetised but to which the magnetising force is no longer applied.

       wet method means any method of magnetic particle inspection in which magnetic particles are applied to a part as a suspension in a liquid.

3 Equipment

       3.1The design and electrical capacity of the magnetic particle equipment used in accordance with this Order must be such as to permit the adoption of the procedures specified in subsection 5 of this Order.

       3.2The equipment must be provided with a means of controlling and measuring the magnetising current used. If this control is of a stepped kind, it must incorporate a sufficient number of steps to ensure that the current used is within the range -10% to +20% of the specified value.

       3.3When alternating current is used, it must not be employed for the residual method unless the equipment is provided with a switching device which ensures that the circuit is broken during the second or fourth quadrant (90 to 180 or 270 to 360 phase angle) of the current waveform.

       3.4Equipment used for demagnetising parts after inspection may be of any type provided it is capable of demagnetising the parts to the requirements of paragraph 7.1.

4 Materials

       4.1The magnetic indication particles used must have high permeability and low retentivity and must be a suitable blend of sizes and shapes to readily produce magnetic particle indications.

Note   Magnetic flaw detection inks