----- Original Message -----
Sent: Tuesday, June 19, 2007 2:51
PM
Subject: [LML] MSU Shelf in Legacy
Here's a photo showing how I installed the shelf for the Pinpoint
Magnetic Sensing Unit (MSU) in the tail of my Legacy:
I hot-melt glued the wood blocks to the sides of the fuselage, protecting
the fuselage with clear packing tape first. (Without the clear tape, the
hot-melt glue is a pain to remove from the carbon.) The shelf is a piece
of left-over carbon, probably from the lower cowl cutout for the nose gear
wheel well, I don't remember. Before installing the shelf, I cut the
hole in it for the MSU and drilled the three holes for attaching
it. I set the shelf in place, leveled it front-to-back and
side-to-side using the long bolts, and then did carbon BIDs to bond the
shelf to the fuselage sides. Once the epoxy cured, I removed the
wood jigs and the clear tape. The MSU is so light that even at maximum G
there's not much force applied to the shelf, and this seems to be strong
enough.
I put the shelf as far back as I could reach, which turned out to be
about half way between the aft baggage bulkhead and the rudder
bellcrank. I put it as high as it would go and still have plenty of room
to drop the MSU down through the top of the shelf. It works;
my MSU compass swing had relatively small errors and I get no
heading change when I move the rudder pedals or use the
autopilot.
Dennis Johnson
Legacy, now flying