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Arriel 1S1

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The Arriel 1 turboshaft engine features a very simple design, with a reduced number of parts and only five modules for easy maintenance. The Arriel 1 has gained a solid reputation in the helicopter market based on its excellent handling characteristics and high level of reliability.

The Arriel 1 has a TBO (Time Between Overhaul) of 3,000 hours, which can be extended to "on condition" on Module 1 and to 6,000 hours on Modules 2 and 4.

The Arriel 1S1 powers the twin-engine medium lift Sikorsky S 76 A+, S 76A++ and S76C helicopters. It is particularly well suited for offshore missions.

Technical data

OEI 2.5 min 598 kW / 802 shp
OEI Continu 588 kW/ 789 shp
AEO (Take-off) 541kW / 725 shp
AEO (Max. continu) 541kW / 725 shp
Length 1.539 mm / 60.6 in
Width 493 mm / 19.4 in
Height 789 mm / 31 in
Power Output Shaft Speed 6.409 rpm