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AD/SD3-30/49 - Engine and Landing Gear Control Cables
Short SD3-30 Series AeroplanesShort SD3-30 Series Aeroplanes
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Short SD3-30 Series Aeroplanes
| AD/SD3-30/49 | Engine and Landing Gear Control Cables | 4/2007 TX |
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| Applicability: | Short Brothers PLC SD3-30 aeroplanes. |
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| Requirement: | 1. Inspect the affected cable assembly end fittings in accordance with Short Brothers PLC Service Bulletin (SB) SD330-76-A09 Revision 1 or later EASA approved revision.2. If no pitting/corrosion or cracking is found repeat the inspection detailed in Requirement 1 of this AD.3. If pitting/corrosion or cracking is found during inspection detailed in Requirement 1 or 2 of this AD, replace the affected cable assembly with a new cable assembly.4. Repeat the inspection of any new cable assembly end fittings in accordance with Short Brothers PLC SB SD360-76-A09 Revision 1or later EASA approved revision.Note: EASA Emergency AD 2007-0039-E dated 16 February 2007 refers. |
| Compliance: | 1. No later than 9 March 2007.2. Within 12 months of the original inspection and thereafter at intervals not to exceed 12 months.3. Before further flight after the effective date of this AD.4. After replacement at intervals not to exceed 15 years. |
| This Airworthiness Directive becomes effective on 23 February 2007. |
| Background: | Following the identification of a failed propeller RPM cable end fitting and an LP fuel lever cable end fitting on an SD3 aircraft, several subsequent occurrences of control cable end fittings (type MS21260) with signs of pitting corrosion or cracking have been reported to Bombardier Shorts. All reported instances being identified during ground maintenance inspections on the SD3 fleet. Bombardier Shorts have performed examinations on the failed cable end fittings and established the root cause of failure as stress corrosion cracking of the SAE-AISI 303 stainless steel material they are manufactured from, initiated by pitting corrosion on the surface. The root cause of the stress corrosion is sustained tensile stress in a corrosive (warm, humid and salty) atmosphere.An analysis of the cable operated control systems installed on the SD3 aircraft types that use MS 21260 type end fittings has identified a number of potentially unsafe conditions due to a combination of failures that may result from this common mode cause. |
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Image unavailable in extracted text David Punshon Delegate of the Civil Aviation Safety Authority