The fuel system of the helicopter

Fuel system and its units provide:

• - fuel supply to engines when operating on fuel grades and their mixtures, adopted for the operation of this helicopter;

• - automatic generation of fuel in a given sequence with possible operational options for refueling tanks with fuel in all modes of helicopter flight;

• - the possibility of manual control of fuel production in the required sequence in the event of a malfunction of the automation and with all possible combinations of the number of working and non-working engines;

• - the possibility of separate switching on and off of each electric drive tank pump for pumping and pumping fuel;

• - the ability to cross-feed fuel through cross-feed lines from any group of tanks to any engine;

• - power supply of the SU engines with fuel when the booster pumps are switched off for the specified operating modes of the engines.

The fuel system must be designed and located so as to prevent the ignition of fuel vapor within the system as a result of direct attacks and shifting lightning strikes in areas with a high probability of a direct hit.

Schematic diagram of the fuel system:

• 1 - additional fuel tanks;
• 2 - kerosene heater KO-50;
• 3 - pass valve filter unit;
• 4 - strainer; 5, 6, 25, 29, 30, 33 - drains;
• 7 - pumps HP-40VG;
• 8 - fine filter;
• 9 - filter units;
• 10 - drain trap drain valve;
• 11 - drain trap;
• 12 - valves conservation;
• 13 - fire hydrants;
• 14 - Railway power of the right engine;
• 15, 18, 21, 24 - return valves;
• 16 - a consumable fuel tank;
• 17 - valve shut-768600MA highway bypass fuel;
• 19 - float valve;
• 20, 36 - jellied mouth;
• 22 - booster pumps ESP-40;
• 23 - pressure alarm LED 29A;
• 26 - external fuel tanks;
• 27 - transfer pumps ESP-75;
• 28, 31, 32 - shut-fuel taps;
• 34 - solenoid valve shut-610200A.