longest inspection cycles
longest inspection cycles
(OP)
i am tasked with creating an external antenna mounting structure for b757 (pressurized fus) and they are asking me to make a design that will yield the longest inspection cycles possible.
how would one implement this? and is there a reference to inspection cycles on srm or amm? any help is appreciated. thanks.
how would one implement this? and is there a reference to inspection cycles on srm or amm? any help is appreciated. thanks.
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RE: longest inspection cycles
Those design details in combination with the existing loads at the location will factor into a fatigue and crack growth analysis. Inspection intervals are then specified based on the speed of the crack growth for your particular design and how long of a crack the manufacturer has defined to be critical.
If you're just doing design, you should have an analyst taking care of the FDT analysis. Focus on the stress severity details and let them determine what inspection intervals to apply. General goal is to design such that inspection intervals required for the new installation are longer than existing inspection intervals for the skin/stringers/frames your dealing with, thereby preventing the imposition of any "new" inspections on the operator.
RE: longest inspection cycles
Are you working for an OEM? Or do you have a DTA DER to approve your work?
Garland E. Borowski, PE
Engineering Manager
Star Aviation
RE: longest inspection cycles
i would look in the area of the fuselage your working on. what is the OEM inspection program ? you should be aware that you are probably changing the inspection technique (probably to an NDI. LFEC) to inspect the fuselage under the doubler, thus even if your inspection program produces longer intervals than the existing program, you're still doing an ICA.
RE: longest inspection cycles
I've actually had this exact same direction. I generally respond with something like, "I will try for a minimum of 6,000 cycles to get you to a c-check". That usually appeases them.
uGlay,
What they are really probably saying is that they don't want to inspect more often than a heavy check, but rb is smartly suggesting that you ask them about existing inspection cycles in the area of interest.
RE: longest inspection cycles
Thanks for the help guys. Yes we have DTA DER, not in-house but he does get a good 2 weeks with the design after completion. Thanks again.
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RE: longest inspection cycles
where would one find the OEM inspection program for this A/C? I am at STA800, between S1 and S2R.
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RE: longest inspection cycles
RE: longest inspection cycles
Thanks.
SW2009 Office Pro SP2.1
Intel Core 2 Duo CPU
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RE: longest inspection cycles
RE: longest inspection cycles
SW2009 Office Pro SP2.1
Intel Core 2 Duo CPU
2.2GHz, 2.00GB RAM
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RE: longest inspection cycles
Last time I got one of those requirements it involved cold working the holes.
RE: longest inspection cycles
A really valuable "how-to" document for damage tolerant repairs was written by FAA guru Tom Swift: lots of practical design concepts for reducing severity of stress concentrations, design for improved in-place inspect-ability, negative and positive affects of proper assembly, etc...
http:/
Regards, Wil Taylor