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AD/BELL 430/2 - Power Turbine RPM Steady State Operation Avoidance
Bell Helicopter Textron Canada (BHTC) 43Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters
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Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters
| AD/BELL 430/2 | Power Turbine RPM SteadyState Operation Avoidance | 10/2005 |
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| Applicability: | Bell Helicopter Textron Canada (BHTC) Model 430 helicopters, serial numbers 49001 through 49111. |
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| Requirement: | 1. Unless previously accomplished incorporate BHT-430-FM-1 Temporary Revision (TR15) or later Transport Canada approved revision into the rotorcraft flight manual.2. Unless previously accomplished, install the decal as per Alert Service Bulletin 430-05-34, dated 10 June 2005, or later Transport Canada approved revision. It is permissible to locally manufacture the decal with white lettering on a black background, minimum 10 point font size.Requirements 1 and 2 may be accomplished by a pilot endorsed on the Bell 430.Note: Transport Canada AD CF-2005-25 refers. |
| Compliance: | Within 10 calendar days after the effective date of this directive. |
| This Airworthiness Directive becomes effective on 29 September 2005. | |
| Background: | Transport Canada has been advised of multiple reports of failure of the third stage turbine wheel used in both the Rolls-Royce 250-C30S and 250-C47B engines. A similar turbine wheel is also installed in the 250-C40B engine which is utilized by BHTC for the Model 430. Rolls-Royce has determined that detrimental vibrations can occur within a particular range of turbine speed as a potential contributing factor to these failures. BHTC revised their rotorcraft flight manual and provided a decal to inform pilots to avoid steady-state operations at these engine turbine speeds. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
15 August 2005