No PTU but it does have a Pitch Enhancement System (PES).
"Heavy Hydraulic System" Left on 75, Centre on 76.
75 all hyd pumps function all the time, 76 has an element of demand in the secondary pumps.
75 C Hyd is 2 electric, 76 Primary is Air Driven Pump (ADP), secondary 2 electric.
CF6 80A reversers are hydraulic, CF6 80C reversers are pneumatic
To be anal, it is the Bleed rather than Aircon that has different valve configs. 75 has one,on 76 one for eaxh L and R Eng Bleed with a Centre (or Body Duct) isolation as well.
Discrete lights different on Bleed system of 76 and mean different things (Also varies with -200 and -300 dependant on engine fitted) Let's put that in the "Too difficult" file!
75 single aisle, 76 twin.
75 2 zones for aircon in cabin 763, 3 zones
Additional Trim Air Valve position indicator for Flight Deck on 763
Autoland: Things happen at different heights on the 76 (such as nose up trim bias etc) See "Too difficult" file.
76 cargo hold fitted for ULD, 75 is bulk loading
Cargo heat on 76, not on 75
Waste tanks from crappers at rear and single drain, vacuum type on 76, caravan type chemical and multiple drain on 75
Crew oxygen overpressure blow off indicator in different places
Forward cargo hold lock indicators fitted on 763, not on 75.
Electrics arranged slightl;y differently (See "Much, much, much too difficult" file.
Sold as a common type but built in different plants and the design teams did arrange to have lunch together once but it never happened.
Can't think of any more. I'm off to polish my lawn mower.
