'In the course of interviewing personnel employed by the maintenance organisation, the ATSB noted a low level of awareness of the need to replace MS21042L/NAS1291-series nuts with the D210-series nuts when critical fasteners were reassembled. This requirement was necessary after cracking from hydrogen embrittlement of the type of nuts fitted to Robinson helicopters was previously identified on other aircraft. It highlighted a 2014 service letter that stated that whenever maintenance that involves the disassembly and reassembly of a critical fastener is performed, the MS21042L or NAS1291 nut should be replaced with a D210-series nut. The bellcrank and missing fastener bolt were recovered, but the reason for the separation of the nut from the bolt has not yet been determined,' the notice said. 'The bellcrank's remaining fasteners were all attached. Voice-activated intercom eliminates the need to use intercom switches during doors-on flights.2017: The site of the fatal Robinson R22 accident north west of Cloncurry.Transmit, intercom, and memory channel radio controls are conveniently integrated into cyclic grip.Left side flight controls are removable.Center positioned T-bar cyclic enables a comfortable grip position and allows trouble-free entry and exit of the cabin.Carburetor heat assist enhances safety by adding carburetor heat when the collective is lowered and reducing carburetor heat when the collective is raised.Automatic clutch engagement simplifies the starting procedure, reducing the possibility of an overspeed during start-up.Proven aluminum and stainless steel construction of main rotor blades minimizes environmental wear and tear.Simple two-bladed rotor system eliminates the need for lag hinges, dampers and hydraulic struts.A heavy-duty muffler and low tail-rotor tip speed lessen flyover noise. The R22 seats two adults and occupants have panoramic views due to R22's large windows. This 145 hp engine is derated to 131 hp for five minutes at takeoff and 124 hp for continuous operation. The R22 Beta II incorporates a Lycoming O-360 four-cylinder, carburetor-equipped engine fueled by 100L grade aviation gasoline. The Robinson R22 Beta II is flown throughout the world for many applications, ranging from flight training to livestock mustering to patrolling pipelines that require dependability, low operating costs, and performance.

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