CH-640 Fuselage Firewall sub-assembly (4 of 52)


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Mark center line on 20-F-7-1 (firewall). Measure from center line 304mm left and right at bottom to mark outside edge location of vertical Z's. Measure from center line 384 mm left & right at top, move down center line until 384mm is at the edge of the firewall and mark this location for the top outside edge of the vertical Z's. I did not do this next step at this time but looking back I sure wish I would have. This next step is to locate the engine mount holes. Measure up 20mm from bottom of firewall and draw a line across the firewall. Measure 282.5 mm from center line left and right and mark for lower engine mount holes. Now measure out 330 mm from center line left and right and draw vertical lines one firewall. Measure from lower engine mount holes 445 mm up firewall to the point that this measurment intersects the lines that are 330 mm from center line. This is the location of the upper engine mount holes. Drill small pilot holes at all four of these points so that later you can drill from the other side through these holes into all the other parts that will be mounted on the firewall.
Mark center line on 20-F-7-1 (firewall). Measure from center line 304mm left and right at bottom to mark outside edge location of vertical Z's. Measure from center line 384 mm left & right at top, move down center line until 384mm is at the edge of the firewall and mark this location for the top outside edge of the vertical Z's. I did not do this next step at this time but looking back I sure wish I would have. This next step is to locate the engine mount holes. Measure up 20mm from bottom of firewall and draw a line across the firewall. Measure 282.5 mm from center line left and right and mark for lower engine mount holes. Now measure out 330 mm from center line left and right and draw vertical lines one firewall. Measure from lower engine mount holes 445 mm up firewall to the point that this measurment intersects the lines that are 330 mm from center line. This is the location of the upper engine mount holes. Drill small pilot holes at all four of these points so that later you can drill from the other side through these holes into all the other parts that will be mounted on the firewall.


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