{"id":"F2007L00477","name":"AD/SD3-60/70 - Engine and Landing Gear Control Cables","slug":"ad-sd3-60-70-engine-and-landing-gear-control-cables","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":63683,"registerId":"commonwealth-F2007L00477-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Short SD3-60 Series Aeroplanes","sectionType":"division","heading":"Short SD3-60 Series Aeroplanes","content":"### Short SD3-60 Series Aeroplanes\n\n| AD/SD3-60/70 | Engine and Landing Gear Control Cables | 4/2007 TX |\n| ------------ | -------------------------------------- | --------- |\n\n| Applicability: | Short Brothers PLC SD3-60 aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the affected cable assembly end fittings in accordance with Short Brothers PLC Service Bulletin (SB) SD360-76-A12 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-A12 Revision 1or later EASA approved revision.Note: EASA Emergency AD 2007-0039-E dated 16 February 2007 refers. |\n| 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.                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 23 February 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n\n| 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. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n20 February 2007","sortOrder":0},{"sectionNumber":"AD/SD3-60/70","sectionType":"part","heading":"AD/SD3-60/70","content":"## AD/SD3-60/70","sortOrder":1},{"sectionNumber":"Engine and Landing Gear Control Cables","sectionType":"part","heading":"Engine and Landing Gear Control Cables","content":"## Engine and Landing Gear Control Cables","sortOrder":2},{"sectionNumber":"4/2007 TX","sectionType":"part","heading":"4/2007 TX","content":"## 4/2007 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive remains narrowly scoped to Short Brothers SD3‑60 aeroplanes using MS21260 type end fittings and targets the specific failure mode identified (stress corrosion initiated by surface pitting). The AD's measures—inspection, replacement and set intervals—align with the safety concern described in the Background and Applicability; there is no indication in the text of scope expansion beyond those aircraft and fittings."},"complexity_factors":["Technical focus on material failure mode (stress corrosion cracking of SAE‑AISI 303 stainless steel) requires specialist inspection skills and judgment (Background).","Multiple mandatory timing rules: initial deadline, 12‑month recurring inspections, immediate replacement before further flight, and 15‑year interval for new assemblies (Compliance 1–4; Requirement 1–4).","Operational burden on small fleet operators: inspections and potentially immediate part replacement create direct costs and possible aircraft downtime (Applicability; Requirement 3; Compliance 3).","Normative references to an external Service Bulletin and EASA approved revisions create dependency on industry/European approvals for acceptable procedures (Requirement 1; Note).","Ambiguity in defect threshold—'pitting/corrosion or cracking'—may require maintenance judgement and could produce inconsistent outcomes between organisations (Requirement 1–4).","Immediate effective date and short initial compliance window increase scheduling and logistical pressure on operators (effective date 23 February 2007; Compliance 1)."],"plain_english_summary":"This Airworthiness Directive requires Short Brothers SD3‑60 operators to inspect specific engine and landing‑gear control cable end fittings (type MS21260) using Short Brothers Service Bulletin SD360‑76‑A12 (or a later EASA‑approved revision), and to replace any assemblies that show pitting, corrosion or cracking. It prescribes initial and recurring inspection intervals and mandates replacement before further flight if defects are found. This affects SD3‑60 operators and maintenance organisations, who must carry out and pay for inspections and replacements; the measure responds to stress‑corrosion cracking reported in service."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety defect in a specific aircraft type. The scope remains tightly focused on the identified cable corrosion issue and has not expanded beyond this original safety purpose."},"complexity_factors":["Single, specific aircraft type (Short SD3-60) with narrow applicability","Only 4 numbered requirements with clear conditional logic (if/then)","Straightforward compliance timeline with absolute deadlines","No defined terms section — uses standard aviation terminology","Single cross-reference to manufacturer service bulletin and EASA emergency AD","Background narrative explains technical cause in accessible language","No nested exceptions or complex procedural hierarchies"],"plain_english_summary":"This AD requires owners/operators of Short SD3-60 aeroplanes to inspect and, where necessary, replace certain stainless‑steel end fittings on control cables to engines and landing gear that are prone to stress‑corrosion cracking in warm, humid, salty environments.  \n\nCompliance follows the manufacturer’s service bulletin, with mandatory replacement for cracked fittings and recurring inspections; it’s essential because failed cables can disable power control or gear deployment, creating major safety and legal risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-70-engine-and-landing-gear-control-cables","history":"/api/acts/ad-sd3-60-70-engine-and-landing-gear-control-cables/history","analysis":"/api/acts/ad-sd3-60-70-engine-and-landing-gear-control-cables/analysis","conflicts":"/api/acts/ad-sd3-60-70-engine-and-landing-gear-control-cables/conflicts","importantCases":"/api/acts/ad-sd3-60-70-engine-and-landing-gear-control-cables/important-cases","documents":"/api/acts/ad-sd3-60-70-engine-and-landing-gear-control-cables/documents"}}