{"id":"F2006B06412","name":"AD/PZL/3 - Upper Fin Rudder Attachment","slug":"ad-pzl-3-upper-fin-rudder-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47761,"registerId":"commonwealth-F2006B06412-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PZL/3 - Upper Fin Rudder Attachment","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)  PZL M18 Dromader Series Aeroplanes\n\n \n\nAD/PZL/3 Upper Fin Rudder Attachment 8/91\n\nApplicability: Serial Number 1Z001-01 to 1Z021-30.\n\n \n\nRequirement: Action in accordance with the Technical Requirements of FAA AD 90-17-15, Amendment 39-6678.\n\n \n\nNote: PZL-Mielec Mandatory Engineering Bulletin (MEB) No. K/02.135/89, dated 29 December 1989, refers.\n\n \n\nCompliance: As specified in the Requirement Document with revised effective date of 8 August 1991.\n\n \n\nBackground: This AD provides for inspection and reinforcement of the fin in the area of the upper rudder attach point, following two reports of cracks and damage to the area.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No change in scope is apparent within the text of this instrument itself. The AD applies to a clearly specified serial-number range (Applicability) and directs compliance with an identified external FAA AD (Requirement). The document sets a revised effective date for compliance (Compliance) but does not expand or narrow applicability beyond the listed serial numbers or alter the referenced FAA technical requirements. The stated purpose (inspection and reinforcement due to reported cracks) aligns with the mandatory action imposed (Background, Requirement)."},"complexity_factors":["References an external technical document (FAA AD 90-17-15) for the required actions rather than specifying steps in-line (Requirement).","Relies on a manufacturer bulletin (PZL-Mielec MEB No. K/02.135/89) as a related technical source (Note).","Narrow applicability limited to a specific serial number range, requiring operators to check serial numbers (Applicability).","Compliance timing is specified via a revised effective date rather than explicit calendar deadlines in the text (Compliance).","Technical nature of inspections and reinforcement implies specialised maintenance capability and potential aircraft downtime (implied by Requirement and Background)."],"plain_english_summary":"What this instrument does (mechanically):\n\n- Requires operators of PZL M18 Dromader aeroplanes with serial numbers 1Z001-01 to 1Z021-30 to carry out inspection and reinforcement work on the fin at the upper rudder attachment point. The required work is to be performed in accordance with the technical requirements set out in FAA AD 90-17-15 (as amended) (\"Requirement\"). Compliance must be completed as specified in that Requirement Document with a revised effective date of 8 August 1991 (\"Compliance\").\n\nOfficial stated reason: the document cites two reports of cracks and damage at the upper rudder attach area as the reason for issuing the directive (\"Background\"). The directive also notes a related manufacturer bulletin, PZL-Mielec MEB No. K/02.135/89 dated 29 December 1989 (\"Note\").\n\nWho is affected and who decides:\n\n- Affected parties are operators/owners of PZL M18 Dromader aeroplanes carrying the listed serial numbers (\"Applicability\").\n- The Civil Aviation Safety Authority issues the directive and requires operators to implement the FAA-specified technical actions (\"Requirement\", \"Compliance\").\n\nWho pays and what behaviour changes:\n\n- Costs for inspections, any reinforcement work, and associated downtime are borne by the operators/owners of the affected aircraft (inferred from the Applicability and Requirement: operators must perform the actions). The directive changes operator behaviour from normal maintenance routines to having to follow the FAA AD technical instructions and the referenced manufacturer bulletin.\n\nHow the directive works in practice and implementation signals:\n\n- The directive does not set technical steps itself; it mandates compliance with an external FAA airworthiness directive (FAA AD 90-17-15) and references a manufacturer mandatory engineering bulletin (\"Requirement\", \"Note\"). This makes the technical obligations dependent on those external documents.\n- The Compliance line fixes the effective date for when the mandated actions must be completed (revised effective date 8 August 1991) (\"Compliance\").\n\nTesting the stated purpose against practical trade-offs and implementation issues:\n\n- Purpose claim: to detect and strengthen the fin where cracks were reported (\"Background\").\n  - Implementation cost: operators must pay for inspections and reinforcement work and accept aircraft out-of-service time (implied by the Requirement referencing a technical remedy). The instrument itself does not quantify these costs (no cost figures provided in the text).\n  - Dependence on external documents: the technical definition of required work is in FAA AD 90-17-15 and the PZL Mielec MEB; operators must obtain and follow those documents to comply (\"Requirement\", \"Note\"). That raises an implementation risk if those documents are updated or difficult to access.\n  - Compliance burden and enforceability: the AD prescribes mandatory action for the listed serial numbers and sets an effective date; it leaves limited discretion to operators about whether or how to comply because the AD directs a specific external standard (\"Requirement\", \"Compliance\").\n  - Effects on private choice and enterprise: the directive restricts operator choice by mandating a particular inspection/repair standard for the affected fleet. Independent maintenance providers can perform the work but must meet the technical requirements from the referenced documents.\n  - Concentration of impact: the obligation applies only to a defined set of serial numbers, so costs and operational disruptions concentrate on owners/operators of those aircraft (\"Applicability\").\n\nPractical notes for operators and maintainers:\n\n- Operators should obtain FAA AD 90-17-15 and PZL-Mielec MEB No. K/02.135/89 to determine the specific inspection and reinforcement steps and the compliance schedule (\"Requirement\", \"Note\").\n- The AD’s effective date for required compliance is recorded as a revised effective date of 8 August 1991 (\"Compliance\").\n\nSource references within the instrument: Applicability; Requirement; Note; Compliance; Background."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating inspection and reinforcement of the upper fin rudder attachment."},"complexity_factors":["Very short document (under 200 words)","Only one substantive requirement: comply with an external FAA directive","Single applicability criterion (serial number range)","No defined terms section","No nested exceptions or conditional logic","Minimal cross-referencing (only one external document plus a manufacturer bulletin)","Clear, single compliance date"],"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). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific **PZL M18 Dromader aircraft** (a Polish-made agricultural/aerial work plane) to inspect and reinforce the tail fin where the upper rudder attaches. This is because cracks were found in this area on two aircraft — a potential safety risk if left unchecked.\n\n**Who must follow it:** Anyone operating PZL M18 Dromader planes with serial numbers from **1Z001-01 to 1Z021-30**.\n\n**What they must do:** Follow the technical instructions in an American aviation safety document (**FAA AD 90-17-15**). There's also a reference to a Polish manufacturer bulletin (**MEB No. K/02.135/89**) for additional guidance.\n\n**When:** The work must be done by **8 August 1991** (the compliance deadline).\n\n**Why it matters:** Cracks in the rudder attachment could lead to loss of control of the aircraft. This directive prevents accidents by catching the problem before it becomes catastrophic."},"summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"Applies to PZL M18 Dromader aircraft with serial numbers 1Z001-01 to 1Z021-30 on the Australian civil register."},"complexity_factors":["References an external FAA airworthiness directive for technical requirements","Requires cross-referencing a manufacturer service bulletin for detailed procedures"],"plain_english_summary":"This airworthiness directive (AD), issued by the Civil Aviation Safety Authority under the Civil Aviation Regulations 1998, requires inspection and reinforcement of the vertical fin structure around the upper rudder attachment point on certain PZL M18 Dromader aircraft. It applies to Australian-registered aeroplanes with serial numbers 1Z001-01 through 1Z021-30. The technical actions must be carried out in accordance with the requirements of Federal Aviation Administration (FAA) AD 90-17-15, Amendment 39-6678, with further guidance in PZL-Mielec Mandatory Engineering Bulletin No. K/02.135/89 dated 29 December 1989. The effective compliance date is 8 August 1991. The AD was prompted by two reports of cracks and damage in the fin at the upper rudder hinge, which could lead to structural failure and loss of control. Owners and operators of affected aircraft must ensure the inspection and any necessary reinforcement have been completed. This directive remains in force for the specified serial numbers on the Australian register. If you are researching whether this applies to a newly imported or existing aircraft, check the aircraft’s serial number and maintenance records. Always refer to the full AD and referenced FAA document for complete details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pzl-3-upper-fin-rudder-attachment","history":"/api/acts/ad-pzl-3-upper-fin-rudder-attachment/history","analysis":"/api/acts/ad-pzl-3-upper-fin-rudder-attachment/analysis","conflicts":"/api/acts/ad-pzl-3-upper-fin-rudder-attachment/conflicts","importantCases":"/api/acts/ad-pzl-3-upper-fin-rudder-attachment/important-cases","documents":"/api/acts/ad-pzl-3-upper-fin-rudder-attachment/documents"}}