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AD/DA42/2 - Propeller System Check Valve Bracket
Diamond DA42 Series AeroplanesDiamond DA42 Series Aeroplanes
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Diamond DA42 Series Aeroplanes
| AD/DA42/2 | Propeller System Check Valve Bracket | 5/2007 |
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| Applicability: | Diamond Aircraft Industries DA 42 model aircraft;DA42 Serial Numbers 42.004 and up including 42.129, and 42.177; andDA 42, Serial Number 42.AC001. |
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| Requirement: | Unless already accomplished, modify the aircraft by installing the additional bracket in accordance with the instructions of Diamond Mandatory Service Bulletin (MSB) 42-024/3 dated 19 September 2006 or later NAA approved revisions.Note: EASA Airworthiness Directive AD 2006-0277 dated 6 September 2006 refers. |
| Compliance: | Within one month or within the next 50 flight hours after the effective date of this directive, whichever occurs first. |
| This Airworthiness Directive becomes effective on 10 May 2007. | |
| Background: | Shortly after an engine change, the aluminium fitting attached to the engine gearbox holding lines and fittings of the propeller control system was found to be cracked. This led to a pressure loss in the propeller control system following a control system malfunction and led to an in-flight engine shutdown.The broken fitting is part of the engine installation and was initially a steel part. It was later modified by the engine manufacturer to an aluminium design. Investigation determined that the area is critical for cracks due to combination of mass, material and installation torque values.With Design Change MAM 42-184, Diamond Aircraft Industries incorporated an additional bracket into the production airplanes to improve the installations and prevent vibration cracks. |
| This Airworthiness Directive requires installation of this bracket for all airplanes, including the airplanes with steel fittings. |
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Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
27 March 2007