The Boeing maintenance manual says there are no restrictions on the angle you can can use a tow bar to move a 727. At about 140 degrees you're driving back into the wing. If you go 90 degrees plus/minus 10 you have to disconect the nose gear electrical conduit. You can go 75 degrees plus/minus 3 without disconecting the nose gear torque links.
Freighters are notoriously tail heavy empty. The MM has a couple cautions about insuring the aircraft is in CG. It references an aft towing CG limit that I've never heard of (I just flew em.) And it says if you're going to tow over rough ground, go slow.
If you charge the brake accumulator (get AC power on the plane, run a B hydraulic pump until the system pressure is 3000 pounds) Boeing says the accumulator has enough fluid and pressure for 5 brake applications. So you may not need power on the plane while moving it. If you can get the APU running, so much the better. Plus you'll have air conditioning. There's a brake pressure gauge, normally in front of the co-pilot's knee, sometimes found on the FE panel.
Last edited by MarkerInbound; 27th June 2013 at 14:44.