{"id":"F2006B02661","name":"AD/B727/139 - Cargo Door Latch Lockpin","slug":"ad-b727-139-cargo-door-latch-lockpin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41977,"registerId":"commonwealth-F2006B02661-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/139 - Cargo Door Latch Lockpin","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 727 Series Aeroplanes\n\nAD/B727/139 Cargo Door Latch Lockpin 3/92\n\nApplicability: Model 727 and 727-100 series; equipped with a main cargo door installed in accordance with STC SA 1368 SO.\n\nRequirement: Action IAW the technical requirements of FAA AD 92-02-03 Amdt 39-8139. Compliance: As specified in the Requirement Document with a revised effective date of 6 March\n\n1992.\n\nBackground: This Directive is prompted by the results of an FAA audit of the cargo door installation which revealed that a revision to the STC allowed for as many as three cargo door latch lockpins to be inoperative during flight. The actions specified in this AD are intended to prevent an inadvertent in-flight opening of the main deck cargo door, with resultant major structural damage and possible reduced controllability of the aircraft. The effective date required by the FAA is extended approximately two months.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard adoption of a foreign airworthiness directive with a minor administrative adjustment (extended compliance date). The scope remains tightly focused on the specific safety defect in the specific aircraft modification."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined term implicitly referenced (STC SA 1368 SO)","Single requirement: comply with external FAA document","No nested conditions or exceptions","No internal cross-references to other sections of Australian regulations","Straightforward applicability test (specific aircraft model + specific modification)"],"plain_english_summary":"This is a **safety order for specific Boeing 727 aircraft** that fixes a dangerous design flaw in the cargo door.\n\n**What it does:**\n- Requires owners and operators of certain Boeing 727 and 727-100 series planes to follow a specific technical fix issued by the US Federal Aviation Administration (FAA AD 92-02-03).\n- The fix addresses a problem where up to three cargo door latch lockpins (the metal pins that keep the cargo door locked during flight) could be broken or missing without anyone knowing—creating a risk the door could blow open mid-flight.\n\n**Who it affects:**\n- Operators of Boeing 727 and 727-100 series aircraft that have a main cargo door installed under a specific modification certificate called \"STC SA 1368 SO\" (a Supplemental Type Certificate—basically official permission to modify the plane).\n\n**Why it matters:**\n- An open cargo door at altitude could tear off, damage the aircraft structure, and make the plane harder to control—potentially causing a crash.\n- Australia is adopting the US safety directive but giving operators about two extra months to comply compared to the American deadline.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A mandatory safety fix—like a recall for aircraft. You cannot legally fly the plane until you comply.\n- **STC (Supplemental Type Certificate):** Official approval for modifying an aircraft design from its original manufacturer specifications.\n- **IAW:** \"In accordance with\"—meaning follow exactly what the referenced document says."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not change the population of affected aircraft or the substantive technical requirements; it adopts FAA AD 92-02-03 for those aircraft identified and only revises the effective date (Compliance; Requirement; Background)."},"complexity_factors":["Narrow applicability limited to Boeing 727/727-100 aircraft with main cargo door installed under STC SA 1368 SO (Applicability).","Cross-reference to an external technical document (FAA AD 92-02-03) for the substantive technical requirements (Requirement).","Technical subject-matter (cargo door latch lockpin systems) requiring specialist maintenance actions.","Timing coordination due to an adjusted effective date (Compliance; Background).","Regulatory reliance on a foreign authority's AD for technical prescription, creating procedural dependency."],"plain_english_summary":"This directive requires owners/operators of Boeing 727 and 727‑100 aeroplanes fitted with the main cargo door under STC SA 1368 SO to carry out the inspections, repairs or modifications specified in FAA AD 92‑02‑03 to prevent inadvertent cargo‑door opening. CASA adopts the FAA technical requirements for Australian compliance, with the AD effective from 6 March 1992; affected operators bear the maintenance costs and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-139-cargo-door-latch-lockpin","history":"/api/acts/ad-b727-139-cargo-door-latch-lockpin/history","analysis":"/api/acts/ad-b727-139-cargo-door-latch-lockpin/analysis","conflicts":"/api/acts/ad-b727-139-cargo-door-latch-lockpin/conflicts","importantCases":"/api/acts/ad-b727-139-cargo-door-latch-lockpin/important-cases","documents":"/api/acts/ad-b727-139-cargo-door-latch-lockpin/documents"}}