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Safety Action

Summary

The kit supplier advised that several constructors had adapted commercially available governor units and fitted them to Safari helicopters. The kit supplier reported that a governor system was in development for future use in their Safari helicopters.

The kit supplier also advised that an improved rotor speed tachometer, with an expanded operating band for better interpretation, was being developed. A warning system that included both audio and visual alarms was to be incorporated into the tachometer. The RPM limits marked on the tachometer, and the alarm settings, were adjusted to indicate a low rotor RPM between 400 and 460 RPM and an overspeed condition above 502 RPM. Normal operation was between 461 and 501 RPM. When testing has been completed, the tachometer and warning system will be made available to Safari owners and to kit constructors.

As a result of this investigation the Australian Transport Safety Bureau issues the following Safety Advisory Notice.

Safety Advisory Notice SAN20040076

The Australian Transport Safety Bureau advises constructors of Canadian Safari and other lightweight helicopters to review the safety benefits of installing an engine speed governor.

Safety Advisory Notice SAN20040077

The Australian Transport Safety Bureau advises constructors of Canadian Safari and other lightweight helicopters to review the safety benefits of providing discernibly different aural warning tones to differentiate between main rotor RPM overspeed and underspeed conditions.

 
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