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A few things that I suggest that you might like to consider:

If by FAR's you have to use the bulkhead as an emergency exit, I think you
might be in severe trouble if you needed to do this in an emergency
situation.  If you try to access from the back side, you'll run into nut
plates and won't be able to take it off from the baggage compartment.  If
your concerned about expansion from bonding it in, think of air as a fluid
in that it expands equally in all directions, thus equal pressure on all
windows that have just been bonded in.  So if you bond the aft bulkhead it
will be under the exact same pressures.  If I was going to bond it in, I
would make the reinforcements around the perimeter minus the nut plates.
Then make the bulkhead overlap in the same fashion, screw it on, hysol in
this area then attach it with 3 bids of carbon on both sides.  This would
make it stronger than the panel itself and the material used to make the
bulkhead is the exact same as the fuseloge and therefore should expand and
contract equally.  I don't think the aft bulkhead on a 747 is removable.
Regards,
Chuck Brenner
CHB Aviation

----- Original Message -----
From: <freemen@mediaone.net>
To: <lancair.list@olsusa.com>
Sent: Tuesday, May 15, 2001 1:02 AM
Subject: Re: LNC4-P Presure Bulkhead Installation

> Now I am thinking that bonding in the bulkheads with Hysol may not be a
good
> idea. The extreme presure/expansion that the Hysol will be under could tend to
<SNIP>
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