Propellers - Variable Pitch - Dowty Roto
Propellers - Variable Pitch - Dowty Rotol
Propellers - Variable Pitch - Dowty Rotol
| AD/PR/32 Amdt 1 | Blade Pitch Seizure | 13/2008 |
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| Applicability: | All R/354/4-123-F/13, R354/4-123-F/20, R375/4-123-F/21, R389/4-123-F/25, R389/4-123-F/26 and R390/4-123-F/27 propellers fitted to SAAB 340 A or B series aircraft. |
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| Requirement: | Modify or de-modify (as applicable) the propeller pitch change mechanism in accordance with Dowty Aerospace Mandatory SB SF340-61-88 dated23 January 1997.Note: UK CAA AD 002-11-96 dated 2 November 1996 refers. |
| Compliance: | Unless previously carried out, incorporate as specified in the Requirement Document paragraph D. |
| This Amendment becomes effective on 18 December 2008. | |
| Background: | The manufacturer has advised that during ground running a propeller which had recently been modified to SB SF340-61-79 status, suffered a seizure of the propeller pitch change. This occurred when the slide block, attached to the crosshead by coiled pins, became detached and allowed the crosshead to turn and contact the blade root inner sleeves which then locked the propeller blades in a fixed position.This amendment corrects a typographical error in the background statement with no change to the requirements or compliance sections. The original background statement referred to “coiled springs” instead of “coiled pins”.The original issue of this AD became effective on 27 March 1997. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
6 November 2008