Changing the Cabin Master Pressure Regulator on the first B-47 jet bomber I was crew chief on..S/N 51-2338 back in 1956. This unit is "buried" in a compartment below the floor level in the cockpit behind the co-pilot's seat. You have to lay on your stomach curled around the seat and work through an access hole about 12 X 14 inches and 16 inches deep. The regulator unit is secured to the pressure bulkhead by a dozen Phillips head capscrews in a circular pattern about 10 inches in diameter. You have to use a magnetic tool to remove and replace these capscrews because you cannot reach them at all with your hands. You loosen and tighten them with a socket Phillips screwdriver, 12 inch long 1/4inch drive extension and ratchet. Of course you have a gasket to replace and keep in position aligned with the holes perfectly too as you do this "little detail". Thank God I was young and kinda skinny in those days, I doubt if I could do it now..(weigh about 60 lbs. more and can't see without glasses).
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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