Leewan,
On the 747, 757, 767, 777, A320, 330, 340.
No Hydraulics = NO flight controls.
You end up with Accidents like
JAL123
Japan Airlines Flight 123 - Wikipedia, the free encyclopedia
severed all four of the aircraft's hydraulic systems.
and
UA232
United Airlines Flight 232 - Wikipedia, the free encyclopedia
which destroyed all three of the aircraft's hydraulic systems.
Nasa did some research with Propulsion Controlled Aircraft (PCA)
NASA - Past Projects - PCA (Propulsion Controlled Aircraft)
On August 29, 1995, Gordon Fullerton once again made a successful landing using only engine power for control, but for this flight the PCA system was installed on a McDonnell-Douglas MD-11 transport aircraft.