CTHIn ForceLegislation
AD/BELL 430/13 - Removal of Air Temperature Restriction
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AD/BELL 430/13 - Removal of Air Temperature Restriction
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| AD/BELL 430/13 | Removal of Air Temperature Restriction | 6/2008 |
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| Applicability: | Model 430 helicopters, serial numbers 49001 through 49098. |
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| Requirement: | Action in accordance with the requirements of Transport Canada AD CF-1997-23R3.Note: BHTC Alert Service Bulletins 430-01-22 original issue, and 430-03-28 original issue, refer. |
| Compliance: | Unless already accomplished, as specified in the Requirement document. |
| This Airworthiness Directive becomes effective on 5 June 2008. | |
| Background: | A main rotor path plane separation on a Model 430 helicopter was found to have been caused by the limited damping characteristics of the elastomeric lead-lag dampers. BHTC introduced as an interim measure a fluid-elastic (fluidlastic) lead-lag damper set, which has increased damping. Additionally, the operation of the aircraft was temporarily restricted to a minimum ambient temperature of -20 degrees C(-4 degrees F). BHTC ASB 430-01-22 reinstated the original temperature operation of the aircraft down to -40 degrees C (-40 degrees F) and introduced installation of new decals with the revised airspeed limitations. The latest revision of the Requirement document introduces an increased Vne airspeed at low temperatures. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
21 April 2008