Viking Air DHC-4 Series Aeroplanes
Viking Air DHC-4 Series Aeroplanes
Viking Air DHC-4 Series Aeroplanes
| AD/DHC-4/1 | Cracking of Upper Engine Mount Brackets | 3/2012 |
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| Applicability: | All Viking Air (formerly Bombardier Inc.) model DHC-4 and DHC-4A aircraft. |
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| Requirement: | Carry out a fluorescent penetrant inspection of upper engine mount bracket assemblies in accordance with Canadian Airworthiness Directive CF-2007-26 dated7 November 2007 or later approved revision.Note: Viking Air Ltd. All Operator Message No. 2007-4-11-02 refers. |
| Compliance: | If the aircraft has an Australian certificate of airworthiness: before further flight after the effective date of this Directive.If the aircraft does not have an Australian certificate of airworthiness: prior to issue of the certificate of airworthiness. |
| This Airworthiness Directive becomes effective on 24 February 2012. | |
| Background: | A DHC-4 fleet operator discovered that five out of ten aircraft had cracked upper engine mount brackets. As an interim action, this Directive mandates a one-time inspection. Subsequent corrective action may be implemented in the future pending results of the investigation. |
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Mike Higgins
Delegate of the Civil Aviation Safety Authority
8 February 2012