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Old 16th Nov 2019, 23:23
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Tom Sawyer
 
Join Date: Jul 2005
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If there was a standard procedure for stop drilling on the type it would be in Chp 20 for the airframe, and Chp 70 for the engine but they would detail "how" to do it, and not where. The manual may give a reference to a repair under the section for the exhaust inspection along the lines of "if cracks are found ...............carry out repair with reference to xyz or AMM 78-10-xxxxx". The repair would give the specific areas where you can/cannot stop drill. As an example, look up fan/compressor blade inspection and there could be a reference to the blending/cropping procedure and it will usually provide detail on which parts of the blade can be blended within certain parameters, and which areas cannot be touched. If there is no specific repair procedure quoted for the cracks in the component, I would not stop drill it unless the technical department gave me a dispensation with specific detail.

DD = Deferred Defect.
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