Robinson R22 helicopter pilots are being cautioned of a drive
belt risk following a fatal accident in north-west Queensland.
On 9 May 2011, a Robinson R22 Beta II helicopter crashed after
its drive belts failed during mustering operations near Julia Creek
(the drive belts transmit engine power to the helicopter's main and
tail rotor blades). The pilot, who died in the accident, was the
only person on board.
The ATSB preliminary investigation report, released today,
highlights a number of factors that can cause drive belt failure.
These include excessive wear due to the misalignment of the belt
drive sheaves, and operating the helicopter beyond the
manufacturer's recommended limits.
ATSB Chief Commissioner, Mr Martin Dolan, said the accident is a
grim reminder of the dangers facing pilots who conduct
mustering-type flights.
'Pushing these helicopters to and beyond their normal limits can
lead to excessive wear and potentially disastrous consequences,' Mr
Dolan said.
'The ATSB is urging Robinson R22 helicopter operators and
maintainers to regularly and carefully check their R22 helicopter
drive system for misalignment, abnormal wear or other indications
of drive belt damage.
'Operators who find anything unusual with their R22 drive
systems are asked to contact the ATSB on 1800 020 616.'
The investigation is continuing. The ATSB will release a final
investigation report within 12 months.
More information on this investigation AO-2011-060 is
available at the ATSB website.
The Civil Aviation Safety Authority has also previously released
an Airworthiness bulletin on the Robinson R22
main rotor drive system, which can be found on the
CASA website, www.casa.gov.au.