{"id":"F2006B10565","name":"AD/HS 748/3 - Aileron Cable Pulley Guard","slug":"ad-hs-748-3-aileron-cable-pulley-guard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116393,"registerId":"commonwealth-F2006B10565-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/3 - Aileron Cable Pulley Guard","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes\n\n \n\nAD/HS 748/3 Aileron Cable Pulley Guard 12/94\n\nApplicability: Model HS748 aircraft without Mod 5244 incorporated.\n\n \n\nRequirement: Action in accordance with Jetstream Aircraft Service Bulletin HS748-27-70 Rev 2.\n\n \n\nNote: UK CAA AD 009-05-94 refers.\n\n \n\nCompliance: Prior to 1 May 1995.\n\n \n\nBackground: The UK CAA requires incorporation of a modification which installs rubbing strips at the rear spar adjacent to where the aileron cable loop turnbuckles are located. This action is required because of an incident where the turnbuckle of an under-tensioned aileron cable fouled a lightening hole in the wing trailing edge structure.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a single structural modification to prevent aileron cable fouling."},"complexity_factors":["Single, specific aircraft model affected (HS 748)","Only one technical requirement (install rubbing strips per specified service bulletin)","Single compliance deadline (1 May 1995)","No nested exceptions or conditional logic","Only one defined exclusion (aircraft with Mod 5244 already incorporated are exempt)","Cross-reference to UK CAA directive is informational only, not a separate compliance obligation","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **British Aerospace HS 748 aircraft** to install protective rubbing strips near the aileron (wing flap) cables. These strips prevent a safety hazard where loose cable turnbuckles (adjustable connectors) could catch on holes in the wing structure.\n\n**Who it affects:**\n- Owners and operators of **HS 748 model aircraft** that haven't already had **Modification 5244** installed\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nA previous incident showed that under-tensioned aileron cables could snag on lightening holes (weight-reduction holes) in the wing's trailing edge. If this happens in flight, it could jam or restrict the ailerons — the control surfaces that make the aircraft bank left and right. A jammed aileron means loss of roll control, which is extremely dangerous.\n\n**What must happen:**\n- Aircraft must be modified following **Jetstream Aircraft Service Bulletin HS748-27-70 Revision 2**\n- The work had to be completed **before 1 May 1995**\n- The UK aviation regulator issued a similar directive (referenced for cross-checking)"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope, as stated in the instrument, is limited to HS 748 aircraft without Mod 5244 and requires carrying out the service bulletin before the named date. The document does not indicate any expansion or narrowing of scope beyond that stated applicability; it implements the specific safety measure described in the Background and references the UK CAA AD."},"complexity_factors":["Narrow applicability: affects only HS 748 aircraft without Mod 5244 (clear scope).","Single, discrete required action: compliance consists of performing the service bulletin work (straightforward mandate).","Fixed deadline: a single compliance date simplifies enforcement and scheduling.","Dependency on external document: the AD delegates technical detail to Jetstream Service Bulletin HS748-27-70 Rev 2, so implementers must consult another source for steps.","Minimal procedural or regulatory detail in the AD itself: no cost, penalty, or administrative processes are specified, reducing regulatory complexity but requiring reliance on other documents/actors."],"plain_english_summary":"This AD makes a previously recommended modification mandatory for British Aerospace HS 748 aeroplanes that do not have Mod 5244: operators must carry out Jetstream Aircraft Service Bulletin HS748‑27‑70 Rev 2 (installing rubbing strips/guards at the rear spar near aileron cable turnbuckles) before 1 May 1995. Issued under the Civil Aviation Safety Authority schedule, it responds to an incident where an under‑tensioned aileron cable fouled wing structure and converts the SB into a compulsory safety action."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-3-aileron-cable-pulley-guard","history":"/api/acts/ad-hs-748-3-aileron-cable-pulley-guard/history","analysis":"/api/acts/ad-hs-748-3-aileron-cable-pulley-guard/analysis","conflicts":"/api/acts/ad-hs-748-3-aileron-cable-pulley-guard/conflicts","importantCases":"/api/acts/ad-hs-748-3-aileron-cable-pulley-guard/important-cases","documents":"/api/acts/ad-hs-748-3-aileron-cable-pulley-guard/documents"}}