{"id":"F2006B10544","name":"AD/HS 748/10 - Door Lock Warning Electrical System Integrity Check","slug":"ad-hs-748-10-door-lock-warning-electrical-system-integrity-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116351,"registerId":"commonwealth-F2006B10544-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/10 - Door Lock Warning Electrical System Integrity Check","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 748/10 Door Lock Warning Electrical System Integrity Check\n\n\n1/95\n\n \n\nApplicability: All HS 748 aircraft.\n\n \n\nRequirement: Carry out electrical indication system integrity check in accordance with paragraph 2.C.(2) of British Aerospace Aircraft Group, Manchester Division HS 748 Alert Service Bulletin 52/90 Revision 1 dated 17 December 1985.\n\n \n\nNote: CAA(UK) AD 008-07-81 refers.\n\n \n\nCompliance: At each `A’ check after 5 January 1995.\n\n \n\nBackground:  This Directive is introduced to ensure the integrity of the electrical door lock indication system.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive’s stated purpose (to ensure the integrity of the electrical door lock indication system) is implemented directly by the requirement to carry out the integrity check at each ‘A’ check after 5 January 1995. The action required matches the stated objective and the population covered is explicit (All HS 748 aircraft). (Background; Requirement; Compliance)"},"complexity_factors":["Single, focused technical requirement (carry out one specific integrity check) reduces legal complexity (Requirement).","Dependence on an external technical document and a specific paragraph (Alert Service Bulletin 52/90 Rev 1, paragraph 2.C.(2)) adds operational complexity because users must locate and correctly apply that material (Requirement).","Timing tied to routine maintenance terminology ('A' check) requires understanding of maintenance schedules, which may vary between operators (Compliance).","Applicability to an entire fleet type ('All HS 748 aircraft') is simple in scope but broad in operational impact (Applicability).","Reference to an external foreign AD (CAA(UK) AD 008-07-81) introduces a cross-reference that may require further consultation (Note)."],"plain_english_summary":"The Directive makes a manufacturer procedure mandatory: all British Aerospace HS 748 operators must perform the electrical door‑lock indication system integrity check per paragraph 2.C.(2) of BAe HS 748 Alert Service Bulletin 52/90 Rev 1 at every scheduled ‘A’ maintenance check after 5 January 1995. It affects operators and maintenance organisations, who bear the time, labour and parts costs, and aims to ensure the system’s continued integrity."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on door lock warning system integrity. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Single, specific technical requirement referencing an external document (the British Aerospace service bulletin)","No defined terms section — uses plain technical language","Simple conditional trigger: 'at each A check after 5 January 1995'","No nested exceptions or cross-references to other legislation beyond a single note about a UK CAA directive","Extremely short — approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of **British Aerospace HS 748 series aircraft** to perform a specific safety check on the **electrical door lock warning system**.\n- The check must follow the exact procedure outlined in a British Aerospace service bulletin (Alert Service Bulletin 52/90, Revision 1, dated 17 December 1985).\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains **HS 748 aircraft** in Australia.\n\n**When it must be done:**\n- At every **'A' check** (a routine maintenance inspection) that occurs **after 5 January 1995**.\n\n**Why it matters:**\n- The door lock warning system tells pilots if the aircraft doors are properly secured. If this electrical system fails, the crew might not know if a door is unlocked — creating a serious safety risk during flight. This directive ensures the warning system actually works when it's supposed to.\n\n**Key point:** This isn't optional. Airworthiness Directives are legally binding safety requirements. Ignoring them means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-10-door-lock-warning-electrical-system-integrity-check","history":"/api/acts/ad-hs-748-10-door-lock-warning-electrical-system-integrity-check/history","analysis":"/api/acts/ad-hs-748-10-door-lock-warning-electrical-system-integrity-check/analysis","conflicts":"/api/acts/ad-hs-748-10-door-lock-warning-electrical-system-integrity-check/conflicts","importantCases":"/api/acts/ad-hs-748-10-door-lock-warning-electrical-system-integrity-check/important-cases","documents":"/api/acts/ad-hs-748-10-door-lock-warning-electrical-system-integrity-check/documents"}}