{"id":"F2006B11052","name":"AD/L200/2 - Horizontal Stabiliser Attach Fittings - Modification","slug":"ad-l200-2-horizontal-stabiliser-attach-fittings-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56675,"registerId":"commonwealth-F2006B11052-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/L200/2 - Horizontal Stabiliser Attach Fittings - Modification","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)  \nMorava L200 Series Aeroplanes\n\nAD/L200/2 Horizontal Stabiliser Attach Fittings \\- Modification 7/63\n\nApplicability: All models.\n\nRequirement: Omnipol Information Bulletin No. L200/076 Part C has been classified as mandatory. This section of the Bulletin requires the replacement of the horizontal stabiliser attach fittings and the modification of the horizontal stabiliser front spar.\n\nCompliance: 1. Replacement of the horizontal stabiliser rear attach fittings, lower fuselage attach fittings on bulkhead No. 17 and strengthening of the horizontal stabiliser as specified on page 9 of the Information Bulletin, is to be carried out before the completion of 2,000 flights.\n\n2. Replacement of the front fuselage attach fittings on bulkhead No. 16 and strengthening of the front spar of the horizontal stabiliser as specified on page 10 of the information bulletin is to be carried out before the completion of 3,500 flights.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This directive converts part of Omnipol Information Bulletin No. L200/076 Part C into a mandatory requirement for all Morava L200 series aeroplanes. Mechanically, the scope has changed from the bulletin being an informational/technical document to its specified replacements and strengthening works being mandatory with two flight-count compliance deadlines (2,000 and 3,500 flights). (Requirement; Compliance 1–2)"},"complexity_factors":["Reference to external technical document (Omnipol Information Bulletin No. L200/076 Part C) — requires obtaining and following that bulletin","Two-stage compliance schedule with different flight-count deadlines (2,000 and 3,500 flights)","Work is technical structural modification/replacement of fittings — requires qualified maintenance and parts","Applicability to entire model line (all models) — affects all operators of L200 series","No alternative compliance paths or exemptions specified in the text — limited procedural complexity but operational scheduling complexity"],"plain_english_summary":"What this instrument does (mechanics)\n\n- This airworthiness directive makes part of an existing information bulletin mandatory for Morava L200 series aeroplanes. Specifically, it requires replacement of certain horizontal stabiliser attach fittings and strengthening/modification of the horizontal stabiliser front spar as described in Omnipol Information Bulletin No. L200/076 Part C. (Requirement)\n\n- It sets two firm compliance deadlines measured in number of flights: the rear attach fittings, lower fuselage attach fittings on bulkhead No. 17 and strengthening on page 9 of the bulletin must be done before the aircraft completes 2,000 flights; the front fuselage attach fittings on bulkhead No. 16 and strengthening of the front spar on page 10 of the bulletin must be done before 3,500 flights. (Compliance 1–2)\n\nWho this affects\n\n- Owners and operators of all Morava L200 series aeroplanes (Applicability: All models).\n- Maintenance organisations, technicians and parts suppliers who will perform and supply the required replacements and strengthening work.\n\nWhy it matters (official claim and practical implications)\n\n- The instrument states that a section of an Omnipol information bulletin has been classified as mandatory, and that the bulletin requires specified replacement and strengthening work. (Requirement)\n\n- Practically, aircraft owners/operators must schedule and pay for the specified structural replacements and modifications within the stated flight-count deadlines. Maintenance organisations must carry out the specified work to the bulletin details. Parts and labour will be required; the precise technical steps are set out in the referenced pages of the bulletin (pages 9 and 10). (Requirement; Compliance 1–2)\n\nCosts, incentives and trade-offs\n\n- Who pays: owners/operators bear the direct cost of parts, labour and any downtime needed to perform the work. (Applicability; Requirement; Compliance 1–2)\n\n- Incentives: to keep aircraft legal to operate under this directive, owners/operators are incentivised to prioritise the replacements/modifications before the flight-count limits are reached. That will shift maintenance scheduling and may increase short-term maintenance expenditures. (Compliance 1–2)\n\n- Trade-offs and opportunity cost: operators must allocate workshop capacity and funds to this mandated structural work, which may defer other maintenance or operational activities. The directive’s flight-count deadlines create time pressure that can concentrate demand for parts/shops over particular windows. (Compliance 1–2)\n\nCompliance burden and implementation risk\n\n- The directive references an external document (Omnipol Information Bulletin No. L200/076 Part C) for the technical instructions, so compliance requires obtaining and following that bulletin. (Requirement)\n\n- Compliance requires physical replacement/strengthening work on the airframe; that entails parts availability, qualified maintenance personnel and aircraft downtime. If parts or qualified labour are scarce, meeting the flight-count deadlines may be operationally disruptive. (Requirement; Compliance 1–2)\n\nBureaucratic discretion and decision-making\n\n- The Civil Aviation Safety Authority (via the Schedule of Airworthiness Directives) has classified the bulletin’s section as mandatory, and has fixed the compliance measures and flight-count deadlines. The directive itself does not set alternative methods of compliance or exemptions; it points to the bulletin for the technical procedure. (Requirement; Compliance 1–2)\n\nEffects on private enterprise and market signals\n\n- Maintenance organisations and parts suppliers that can provide the specified fittings and modification services will see increased demand from L200 operators. The directive narrows technical choice by specifying the bulletin’s prescribed work, which shifts expenditure toward the required modifications rather than alternative solutions. (Requirement; Compliance 1–2)\n\n- The directive applies to all models in the L200 series, so the market effect is broad across that fleet. (Applicability)\n\nConcrete behaviour changes required\n\n- Aircraft owners/operators must: (a) obtain the referenced bulletin, (b) arrange for replacement of the rear attach fittings, lower fuselage fittings on bulkhead No. 17 and the strengthening from page 9 before 2,000 flights, and (c) arrange for replacement of the front fuselage attach fittings on bulkhead No. 16 and strengthening of the front spar from page 10 before 3,500 flights. (Requirement; Compliance 1–2)\n\nImplementation notes and observable risks\n\n- The directive creates two staged deadlines, which may produce concentrated demand for parts/maintenance close to each flight-count threshold. (Compliance 1–2)\n\n- Because the technical steps are in an external bulletin, the directive’s practical effect depends on that bulletin’s clarity and the availability of necessary parts and skilled labour. (Requirement)\n\nSource citations\n\n- Applicability: \"All models.\" (Applicability)\n- Mandatory classification and technical reference: \"Omnipol Information Bulletin No. L200/076 Part C has been classified as mandatory...replacement of the horizontal stabiliser attach fittings and the modification of the horizontal stabiliser front spar.\" (Requirement)\n- Compliance deadlines: \"...before the completion of 2,000 flights\" and \"...before the completion of 3,500 flights.\" (Compliance 1–2)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a specific, targeted airworthiness directive addressing a known structural defect in a particular aircraft series. It has not expanded beyond its original purpose of mandating safety modifications to the horizontal stabiliser attach fittings."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined compliance deadlines (2,000 and 3,500 flights)","No nested exceptions or conditional logic","Single applicability criterion ('All models')","References external technical document (Omnipol Information Bulletin) but does not reproduce its content","Straightforward two-stage compliance schedule based on flight count"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all models of **Morava L200 series aeroplanes** (small aircraft).\n\n**What it requires:**\nOwners and operators must modify the aircraft's **horizontal stabiliser** (the small wing at the tail that keeps the plane level) by:\n- **Before 2,000 flights:** Replacing rear attach fittings, lower fuselage fittings at bulkhead No. 17, and strengthening the horizontal stabiliser\n- **Before 3,500 flights:** Replacing front fuselage fittings at bulkhead No. 16 and strengthening the front spar (the main structural beam)\n\n**Why it matters:**\nThe directive makes mandatory a manufacturer's bulletin about structural weaknesses in how the tail attaches to the fuselage. Without these modifications, the fittings could fail — potentially causing loss of control of the aircraft. This is a **flight safety critical** requirement with hard deadlines measured in flight cycles."}},"importantCases":[],"_links":{"self":"/api/acts/ad-l200-2-horizontal-stabiliser-attach-fittings-modification","history":"/api/acts/ad-l200-2-horizontal-stabiliser-attach-fittings-modification/history","analysis":"/api/acts/ad-l200-2-horizontal-stabiliser-attach-fittings-modification/analysis","conflicts":"/api/acts/ad-l200-2-horizontal-stabiliser-attach-fittings-modification/conflicts","importantCases":"/api/acts/ad-l200-2-horizontal-stabiliser-attach-fittings-modification/important-cases","documents":"/api/acts/ad-l200-2-horizontal-stabiliser-attach-fittings-modification/documents"}}