Robinson R44 series helicopters fitted with Tail Rotor Blades (TRBs) P/N C029-1 or C029-2.
To advise aircraft operators and maintainers that the CAA has received a number of reports of finding cracked TRBs with P/N C029-1 and C029-2 installed on Robinson R44 series helicopters.
The CAA and Robinson Helicopter Corporation (RHC) have received reports of finding fatigue cracks in the leading edge of TRBs with P/N C029-1 and C029-2. The cracks are caused by high fatigue stresses during manoeuvres with large left pedal inputs. TRB P/N C029-3 incorporates design features to reduce fatigue stresses. RHC SB-83 requires the introduction of a Special Pilot Caution into the AFM until TRBs with P/N C029-3 are installed. (P/N C029-3 TRBs require a G062-1 hub assembly.)
Recommendations:
The CAA recommends that operators and maintainers accomplish the following:
