De Havilland DHC-1 (Chipmunk) Series Aer
De Havilland DHC-1 (Chipmunk) Series Aeroplanes
De Havilland DHC-1 (Chipmunk) Series Aeroplanes
| AD/DHC-1/40 | Canopy Lock - Modification | 16/2011 |
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| Applicability: | All Canadian DHC-1B-2 Chipmunk aircraft serial numbers 139 to 195. |
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| Requirement: | Modify the canopy lock mechanism in accordance with De Havilland Aircraft of Canada Limited Technical News Sheets C-38 and C-38 Amendment 2.Note: Transport Canada Airworthiness Directives CF-53-11 and CF-54-02 refer. |
| Compliance: | As stated in the requirement document unless previously incorporated. |
| This Airworthiness Directive becomes effective on 12 August 2011. | |
| Background: | Difficulties have been reported in releasing the canopy due to the failure of the cable in the lock assembly. DHC Canada then amended this modification using an improved lever assembly following reports of cracking. |
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Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
5 August 2011