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All operators and maintainers of Robinson R44 series helicopters fitted with a hydraulic assisted flight control system.
This Continuing Airworthiness Notice (CAN) advises operators and maintainers of affected R44 helicopters to accomplish an inspection of the flight control system hydraulic servos.
This CAN is prompted by Australian Transport Safety Bureau (ATSB) Safety Advisory Notice AO-2011-016-SAN-001 which is issued after an overseas R44 Astro training flight accident. A preliminary examination of the wreckage identified that a bolt securing part of the flight control system had detached.
Although the overseas accident is still under investigation the ATSB in the interest of aviation safety have issued Safety Advisory Notice AO-2011-016-SAN-001 recommending and inspection of the hydraulic flight control servos fitted to Robinson R44 aircraft.
The CAA recommends that operators and maintainers of Robinson R44 fitted with a hydraulic assisted flight control system review Safety Advisory Notice AO-2011-016-SAN-001 and inspect the aircraft flight control system paying particular attention to the attachment of the flight control hydraulic servos.
For further background information on the subject of this CAN a copy of ATSB Safety Advisory Notice AO-2011-016-SAN-001 and the Preliminary ATSB Safety Report can be obtained from: http://www.atsb.gov.au/publications/investigation_reports/2011/aair/ao-2011-016.aspx(external link)