On Fri, 07 Feb 2014 20:18:02 +0000, Bob Lowe
wrote:

replying to Bob Lowe, Bob Lowe wrote:
Bob Lowe wrote:

Hi again- Apparently there is no standard 'Grade' for Aircraft hardware
such
as
bolts and nuts, only Aircraft 'Quality'. Does anyone know of any
'Standards'
for this 'Quality'? The best that I can determine is that each manufacture
of
Aircraft Quality Hardware have their own standards and are not made to any
'Industry' standards. I have found out that some manufactures will not
even
give a PSI rating for their nuts and bolts, only stating that they are of
'Aircraft Quality'. Can anyone put more light on this?
Thanks,


Hi - FWTW, I just cut this from a 737 accident report...Engine mounts on
Boeing jetliners are a major safety issue.
I have always maintained that I would make a poor aircraft designer
because my planes would be too heavy to fly. At one time I was a liaison
at the Grumman plant at Calverton, Long Island and it was after Grumman
had been asked by the Navy to design an F-111 version for them. They
built three with each lighter and after the third the Navy said it was
still too heavy and Grumman said okay, we are not going to build it any
lighter so forget it. So there are aircraft design engineers out there
that may think like me, but only somewhat, I agree. I worked for Douglas
Aircraft and their philosophy was, build it light, and then beef it up
where required later. Thanks,

Bob Lowe

This was essentially how the Navy got out of accepting the General
Dynamics F-111, except they tidied it all up in "wind over the deck"
calculations.
--
Cheers,

John B.