Design and development
The Tu-155 first flew on 15 April 1988. It used
hydrogen fuel and later
liquified natural gas (LNG). It flew until the fall of the
Soviet Union and it is currently stored at
Ramenskoye Airport near
Zhukovskiy. The Tu-156 was intended to fly around 1997, but was cancelled also due to the fall of the Soviet Union. The aircraft used
cryogenics to store fuel. The fuel tank was located in the air-blown (or
nitrogen) rear compartment. A distinctive feature of the aircraft is that the protrusion of the ventilation system is visible on the tail (near the no.2 engine). The Tu-155 used
Kuznetsov NK-88 engines. The Tu-156 was intended to use
Kuznetsov NK-89 engines.
 It flew around 100 flights until it was placed in storage. During test flights 14 world records were established for hydrogen-powered aircraft.