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Conditions for approval required by: Julien Gauther
Certification of Aerospace Products to international quality Standards
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According to HOWMET, the tolerance of the “E” dimension was “+” in the prEN4074 version of the standard; so E : +0/+0.3, then became “-” in the issue of 2009 of the standard (E : -0.3/0).
HOWMET considers “+0.3” in its definition in accordance with the initial tolerance value.
It appears acceptable according to the auditor and it would be suitable to update the standard EN4074 accordingly.
Sometimes, it is “+”, sometimes, it is “-“. However, a lot of ASNA standards, EN standards (EN4178 for instance) specify a height recess tolerance “+”. Thus, agreed from my side.
Best regards,
Julien