De Havilland DHC-1 (Chipmunk) Series Aer
De Havilland DHC-1 (Chipmunk) Series Aeroplanes
De Havilland DHC-1 (Chipmunk) Series Aeroplanes
| AD/DHC-1/31 Amdt 3 | Fin Rear Spar | 13/2011 |
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| Applicability: | English production (C1), all models, and Portuguese (T Mk 20) production models. |
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| Requirement: | Inspect the fin structure for cracks and corrosion in accordance with paragraphs 2.4, 3.6 and 4 of British Aerospace Technical News Sheet (TNS) CT (C1) No. 156 Issue 5 or later revision published by British Aerospace Aerostructures Limited.Conduct dye penetrant inspections in accordance with CAO 108.10.Modification H283 performed in accordance with Note 1 of TNS No. 156 Issue 5 terminates the requirement for the inspections described in paragraph 3. |
| Compliance: | Inspect at intervals not to exceed 3 years or 600 hours, whichever occurs first.Compliance with Amendment 1 constitutes compliance with this Amendment. |
| This Amendment becomes effective on 23 June 2011. | |
| Background: | British Aerospace has reported that cracks have been found in the fin rear spar at a number of critical locations, and that corrosion has been found in the internal fin structure.This amendment includes the Portuguese manufactured (T Mk 20) in the applicability of this AD. A recent review indicates that the inspection required by this AD is applicable to this model.Amendment history:Amendment 1 incorporated Issue 4 of TNS No. 156, which revised paragraph 5 inspection interval from 6 years or 600 hours, to 3 years or 600 hours. |
| Amendment 2, effective 30 July 2010, incorporated Issue 5 or later revision of TNS No. 156. |
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Glen Steemson
Delegate of the Civil Aviation Safety Authority
17 June 2011