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As distinct from the TV2-117 engines, the TV3-117 engines are started by a low-pressure air starter.
Hence an auxiliary power unit (APU) is installed aft the main gear box.
The APU is mounted at 90° to the fuselage axis. The air intake is on the right hand side and the exhaust on the left hand side.
Also, the APU installation changed the shape of the main gear box cowling, with a pronounced hump aft the main rotor head
instead of the first generation smoothly curved contour. |
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