Sorry buddy you but you are sadly mistaken, the PTU will not overheat a system when both reservoirs have hydraulic fluid.
The problem happens when one system is empty while the other system is operating the PTU to pressurize the empty system. Since there is nothing tompressurize the PTU will "overspeed" and overheat the full system, leading to a dual hydraulic loss due to overheat.
This problem will be masked by landing and takeoff inhibit. above 1500ft on t/o the ecam will display instructing to turn off the ptu.
This can happen in both directions, green to yellow or yellow to green.
When an engine is shutdown the PTU will operate for far more than 2 minutes. The airbus has no electrical hydraulic pumps (only engine driven, yes there is a yellow electrical but that is not used normally for pressurizing the system in case of engine driven pump failure), so the PTU will pressurize the remaining system.
And it will do so happily for ages and ages without overheating the systems.
There is no danger in these videoclips.
In addition easyjet airbusses have been modified to display an empty reservoir ecam around 400ft on t/o.
Last edited by 737Jock; 24th Jan 2013 at 11:22.