{"id":"F2006B09091","name":"AD/DHC-3/5 - Booster Pump, Fuselage Former Cap Strips, Rear Cabin Seats","slug":"ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115644,"registerId":"commonwealth-F2006B09091-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/5 - Booster Pump, Fuselage Former Cap Strips, Rear Cabin Seats","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)  DHC-3 (Otter) Series Aeroplanes\n\n \n\nAD/DHC-3/5 Booster Pump, Fuselage Former NK\n\nCap Strips, Rear Cabin Seats\n\nApplicability: As detailed in Requirement Document.\n\n \n\nRequirement: Action in accordance with De H Canada TNS Otter Nos 22, 24 and 25.\n\n \n\nNote: Canadian AD 54-9 refers.\n\n \n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The text supplied does not indicate any change in scope from an original or prior instrument. It defines applicability by reference to a Requirement Document and mandates the technical actions by reference to De Havilland Canada TNS Nos 22, 24 and 25, with immediate effect (Compliance: “Forthwith”). There is no statement within this AD that expands or narrows scope relative to an earlier instrument; any change would need to be demonstrated by comparing this AD to prior texts, which are not provided here."},"complexity_factors":["Short, high-level text that omits the technical steps and instead references external technical notices (De H Canada TNS Nos 22, 24 and 25). (Requirement.)","Applicability is not stated in this text; the Requirement Document defines which aircraft/operators are affected, requiring the reader to consult additional material. (Applicability.)","Immediate compliance timing (“Forthwith”) increases operational and logistical complexity for affected operators. (Compliance.)","Technical work likely requires specialist maintenance skills, parts and tooling whose availability is unknown from this text. (Requirement.)","Cross-reference to a foreign AD (Canadian AD 54-9) requires that implementers reconcile multiple documents. (Note.)","Potential enforcement and acceptability judgments depend on how regulator applies the referenced TNS material, adding interpretive complexity. (Requirement.)"],"plain_english_summary":"This Airworthiness Directive requires operators of the listed De Havilland Canada DHC‑3 (Otter) aeroplanes to carry out, forthwith, the actions specified in De Havilland Canada TNS Nos 22, 24 and 25 addressing the booster pump, fuselage former cap strips and rear cabin seats. It makes compliance mandatory for affected owners/operators, who must arrange immediate inspections/repairs, parts and downtime; the AD also cross‑references Canadian AD 54‑9."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing specific technical issues in a single aircraft type. It has not expanded beyond its original purpose of mandating specific maintenance actions for the DHC-3 Otter."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative provisions: applicability, requirement, note, and compliance","No defined terms section — relies entirely on external technical documents","Single cross-reference to Canadian AD 54-9 and three de Havilland Canada technical sheets","No conditional logic, exceptions, or nested provisions","Straightforward command structure: 'do this immediately'"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — 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 **de Havilland Canada DHC-3 (Otter) series aeroplanes** to carry out specific safety modifications or inspections on three parts of the aircraft:\n- **Booster pump** (a fuel system component)\n- **Fuselage former cap strips** (structural reinforcement pieces around the aircraft's frame)\n- **Rear cabin seats**\n\n**Who it affects:**\nAnyone who owns, operates, or maintains DHC-3 Otter aircraft in Australia.\n\n**What must be done:**\nOperators must follow the instructions in three technical documents from the manufacturer (de Havilland Canada Technical News Sheets Otter Nos. 22, 24, and 25). These documents detail exactly what work needs to be performed.\n\n**When:**\n**Forthwith** — meaning immediately, without delay.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They are issued when CASA identifies unsafe conditions in aircraft design or manufacture. Non-compliance means the aircraft cannot legally fly in Australian airspace. This particular AD addresses potential safety issues with fuel delivery, structural integrity, and passenger seating — all critical to flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats","history":"/api/acts/ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats/history","analysis":"/api/acts/ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats/analysis","conflicts":"/api/acts/ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats/conflicts","importantCases":"/api/acts/ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats/important-cases","documents":"/api/acts/ad-dhc-3-5-booster-pump-fuselage-former-cap-strips-rear-cabin-seats/documents"}}