Accept or not?
Accept or not?
(OP)
Background: A repair scheme was called from manual that the material use is a 0.063" thikness Al plate. Unfortunately only a 0.061" plate is on-hand.
Query: The mechanic refues to use it because its 0.002" thinner than RS quoted. But the pocurement staff said that all the wrought mat'l have a tolerance in thickness (+/- 0.00X")so it's acceptable for work.
Any comment!!
Query: The mechanic refues to use it because its 0.002" thinner than RS quoted. But the pocurement staff said that all the wrought mat'l have a tolerance in thickness (+/- 0.00X")so it's acceptable for work.
Any comment!!





RE: Accept or not?
If you have the material certification that states that the material in question was procured as .063 sheet per the applicable spec., then the mechanic doesn't have a reason to object.
Standard tolerances on .063 sheet will vary from manufacturer to manufacturer, but I've seen .003" as a tolerance from some of them.
If the mechanic still resists, is it not possible to contact the engineer who designed the repair to approve the variance? If not, is there another engineer available to approve it?
SuperStress
RE: Accept or not?
0.047-0.063 inch thickness
+ 0.0020 inches for width up to 47.24 inches
+ 0.0030 inches for width up to 70.87 inches
+ 0.0035 inches for width up to 86.61 inches
ASTM and ANSI standards use the tolerances developed by the Aluminum Association.
RE: Accept or not?
SuperStress
I can't agree any more with you as someone to approve the variance. I thought it's the most appropriate way to solve the problem.
Meanwhile, if the mat'l was pocured as 0.061", what's up?
TVP
Would you mind show me the ASTM and ANSI standard no.?
RE: Accept or not?
RE: Accept or not?
FYI, since .061" isn't a standard gage (that I'm aware of) it's pretty unlikely that the shop just has some lying around. It's almost certainly .063" stock on the low end of the tolerance range.
SuperStress
RE: Accept or not?
http://www.global.ihs.com
RE: Accept or not?
he has the right to refuse,,, you can discuss it with the FAA ,but be prepared to write some reports