{"id":"F2006B02784","name":"AD/B727/80 Amdt 1 - Horizontal Stabilizer Centre Section Front Spar Junction Fittings - Inspection","slug":"ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42126,"registerId":"commonwealth-F2006B02784-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/80 Amdt 1 - Horizontal Stabilizer Centre Section Front Spar Junction Fittings - Inspection","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)  Boeing 727 Series Aeroplanes\n\n \n\nAD/B727/80\n\nAmdt 1\n\n\nHorizontal Stabilizer Centre Section Front Spar Junction Fittings - Inspection\n\n\n2/78\n\n \n\nApplicability: All models.\n\n \n\nDocument: 1. FAA AD 77-18-06 Amdt. 39-3048; or\n\n \n\n2. Boeing SB No. 55-A69, Rev. 1. Compliance: As per requirement document No. 1.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific structural inspection. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external referenced documents","Simple conditional structure: applicability statement + compliance requirement","Single cross-reference to FAA AD and Boeing Service Bulletin (external documents not reproduced)","No nested exceptions or conditional logic — straightforward mandate"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of Boeing 727 aircraft to inspect a specific structural component.\n\n**What it does:**\n- **Targets:** The \"horizontal stabilizer centre section front spar junction fittings\" — these are critical metal joints where the tailplane (the horizontal wing at the back of the aircraft) connects to the fuselage. Think of them as the \"shoulder joints\" of the tail.\n- **Requires:** Inspection of these fittings for cracks, corrosion, or damage that could compromise the aircraft's structural integrity.\n- **Applies to:** All models of Boeing 727 aircraft.\n\n**Why it matters:**\n- These fittings bear enormous stress during flight. If they fail, the pilot could lose control of the aircraft's pitch (nose up/down movement).\n- The directive references an American FAA safety order (77-18-06) and a Boeing Service Bulletin (55-A69), meaning this addresses a known defect discovered in the global fleet.\n- Compliance is **mandatory** — operators cannot legally fly the aircraft until the inspection is completed as specified.\n\n**Who must comply:** Airlines, cargo operators, or private owners flying Boeing 727s in Australian airspace."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument applies to all Boeing 727 models and directs inspections per the referenced FAA AD (\"Applicability: All models\"; \"Compliance: As per requirement document No. 1\"). The document is labelled as an amendment (Amdt 1) but provides no text here that expands or narrows the set of affected aircraft or the action required beyond requiring compliance with the named FAA AD. On the basis of the text supplied, there is no explicit sign that the substantive scope of affected aircraft or the inspection obligation has been changed from earlier versions; the instrument simply directs compliance with the referenced FAA AD."},"complexity_factors":["References external technical documents (FAA AD and Boeing service bulletin) for substantive requirements rather than containing detailed procedures itself (Document / Compliance).","Ambiguity in the instrument's text listing two documents but specifying compliance explicitly with Document No. 1 (Document vs Compliance), which requires users to confirm which source governs.","Technical nature of inspections (airframe fittings) requires specialist maintenance knowledge to implement, increasing operational complexity for affected parties.","Broad applicability to all Boeing 727 models raises operational scope (\"Applicability: All models\").","Lack of timing, interval, or remediation detail inside this instrument forces reliance on the referenced documents, adding a layer of cross-referencing and administrative steps."],"plain_english_summary":"This directive requires operators of all Boeing 727 models to inspect the horizontal stabilizer centre-section front spar junction fittings. It does not set technical steps itself but mandates compliance with FAA AD 77-18-06 (with Boeing SB 55-A69 Rev.1 as an alternate source) as the binding inspection and corrective-action authority.\n\nPractically, operators bear the cost and responsibility to obtain the referenced AD and carry out any inspections or repairs it prescribes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection","history":"/api/acts/ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection/history","analysis":"/api/acts/ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection/analysis","conflicts":"/api/acts/ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection/conflicts","importantCases":"/api/acts/ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection/important-cases","documents":"/api/acts/ad-b727-80-amdt-1-horizontal-stabilizer-centre-section-front-spar-junction-fittings-inspection/documents"}}