Document ID: chunk:federal_register_of_legislation:F2007L04654:body:0:p6
Version: federal_register_of_legislation:F2007L04654
Segment Type: other
Provision Reference: 
Character Range: 13460–16245

7 Repeat inspections

       7.1If it is necessary to undertake a repeat inspection of a part, the same process and materials from the same source of manufacture as used in the initial inspection must be used unless it has been established that the subsequently applied materials are compatible with those used in the original inspection.

       7.2Fluorescent dye penetrants must not be used to repeat an inspection where a colour contrast penetrant was used originally.

Note   Repeat inspection in this context means an inspection being repeated on a part, the integrity of which has not been established by the first inspection and where there is a danger of penetrant materials being retained with a flaw. When an inspection of a part is being repeated after some elapsed period in service (e.g. as may be required by a Service Bulletin or Airworthiness Directive), and it can be confidently assumed that the part was free from defects at the last inspection, the limitations of paragraphs 4.1 and 4.2 do not apply.

Appendix III

This Appendix specifies procedures to be adopted for the control of penetrant materials and equipment.

1 Penetrant materials

      1.1 Penetrant materials which may be subject to contamination must be checked periodically for deterioration of their properties which would adversely affect their performance. The materials may be tested separately using tests similar to those specified in the United States Military Specification Mil-I-25135, but as a minimum requirement the process as a whole must be subjected to a functioning test for overall sensitivity.

      1.2 A functioning test must consist of subjecting a sample containing natural or artificially induced cracks to the inspection process as a whole and assessing whether there has been any deterioration in any of the following:

(a) the contrast of the crack indications with the background surface;

(b) the clarity with which the crack indications are delineated;

(c) the absence of spurious indications resulting from difficulty in removing excess penetrant;

(d) the ease with which all traces of penetrant materials may be removed after inspection.

      1.3 Before use, the reference samples used for the functioning test must be thoroughly cleaned to ensure that no materials from previous tests remain within the cracks.

2 Equipment

       2.1Ultraviolet lamps together with their filters must be tested not less than once every 3 months for the intensity of ultraviolet light output. The intensity must be not less than 1350 lumen m­² (1,020 Wcm­²) or 125 foot candle when measured with a Weston Light Meter model 703, type 51 or equivalent, or an Ultraviolet Products Inc. Ultraviolet Meter model J-221 or equivalent, placed 380 mm from the surface of the filter.