{"id":"F2006B11104","name":"AD/LEARJET 35/25 - Flap Attachment Fittings","slug":"ad-learjet-35-25-flap-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56764,"registerId":"commonwealth-F2006B11104-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/25 - Flap Attachment Fittings","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)  Gates Learjet 35 and 36 Series Aeroplanes\n\n \n\nAD/LEARJET 35/25 Flap Attachment Fittings 9/86\n\nApplicability: All model Learjet 35 and 36 with Serial Numbers listed in the Requirement Document.\n\n \n\nRequirement: Inspect in accordance with Gates Learjet 35 S.B. 35/36-27-16. Compliance:  Within 200 hours time in service after 30 September 1986.\n\nBackground: Cracking of the flap attachment fitting has become evident in service. Failure of a flap attach fitting may result in an asymmetric flap condition.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a narrowly focused scope: it requires inspection of flap attachment fittings on specified Learjet 35 and 36 aircraft as set out in the Requirement Document and to the procedure in the referenced service bulletin. The document does not expand or narrow that scope beyond the inspection mandate and the listed applicability and deadline; no change of scope from the stated requirement is indicated in the text. (Applicability; Requirement; Compliance)"},"complexity_factors":["Single, specific mandatory action: one inspection requirement (Requirement).","Applicability limited to listed serial numbers rather than entire fleet, reducing scope complexity (Applicability).","Clear, short compliance timeframe: 200 hours time in service after 30 September 1986 (Compliance).","Procedure delegated to an external document (Gates Learjet service bulletin), which requires operators to consult another source (Requirement).","Limited explanatory material: brief background statement only, no detailed enforcement or repair specifications in the directive itself (Background)."],"plain_english_summary":"What this directive does, in plain terms:\n\n- Mechanically, the directive requires specified Learjet 35 and 36 aeroplanes to have their flap attachment fittings inspected according to the manufacturer's service bulletin (Gates Learjet 35 S.B. 35/36-27-16). (Requirement)\n- It applies only to Learjet 35 and 36 aeroplanes whose serial numbers are listed in the Requirement Document. (Applicability)\n- The inspection must be completed within 200 hours time in service after 30 September 1986. (Compliance)\n\nWhy it exists and what it says about risk:\n\n- The directive states the reason for the inspection is that cracking of the flap attachment fitting has been observed in service, and that failure of a flap attachment fitting could cause an asymmetric flap condition. This is presented as the safety rationale for the inspection requirement. (Background)\n\nWho pays and who decides:\n\n- The direct cost and practical burden of complying falls on the aircraft owner/operator who must arrange the inspection and any follow-up work. (Requirement; Compliance)\n- The directive prescribes the inspection procedure by reference to a Gates Learjet service bulletin. That means the operator (or their maintenance provider) implements the steps in that bulletin to satisfy the requirement. (Requirement)\n- The issuing authority sets the obligation and timing, while operators/maintenance organisations carry out the inspection and any repairs. (Applicability; Requirement; Compliance)\n\nPractical effects, incentives and trade-offs:\n\n- Operators must schedule and complete the inspection within the specified 200 flight-hour window after 30 September 1986, which may require temporary downtime for the aircraft until inspection (and possible repair) is completed. (Compliance)\n- The directive channels action to a manufacturer-created procedure (the referenced service bulletin). That concentrates the technical method for compliance in the manufacturer's document rather than in the directive text itself. (Requirement)\n- The immediate incentive for operators is to avoid continued operation without inspection where cracking could lead to component failure; the immediate cost is the time and money to inspect and, if necessary, repair or replace fittings. (Background; Requirement)\n\nCompliance burden and implementation risks:\n\n- The compliance burden is primarily the inspection process required by the service bulletin and any follow-on maintenance. The directive sets a firm deadline (200 hours after 30 September 1986), which creates a clear timetable for operators to meet. (Requirement; Compliance)\n- Implementation risk includes the possibility of missed or incorrectly performed inspections if operators do not follow the referenced service bulletin or if maintenance actions are incomplete. The directive itself does not describe enforcement mechanisms or penalties. (Requirement)\n\nSummary statement:\n\nThis airworthiness directive makes a time-limited inspection mandatory for certain Learjet 35/36 aeroplanes because cracking has been found in flap attachment fittings and failure could lead to asymmetric flaps. The operator bears the inspection and repair costs, must follow the Gates Learjet service bulletin, and must complete the work within the 200-hour window specified. (Applicability; Requirement; Compliance; Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1986. It has not grown beyond its original purpose of addressing a specific mechanical defect in specific aircraft. The scope remains precisely limited to the flap attachment fitting inspection requirement."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined elements: applicability (by aircraft model and serial number) and compliance deadline","Single requirement with clear reference to external technical document (service bulletin)","No nested conditions, exceptions, or cross-references to other legislation","Straightforward temporal compliance trigger (200 hours time in service after fixed date)","Minimal legal drafting — primarily technical instruction format"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Gates Learjet 35 and 36 series aircraft**.\n\n**What it does:**\n- **Orders mandatory inspections** of the flap attachment fittings on these aircraft\n- Requires operators to follow a specific service bulletin: **Gates Learjet 35 S.B. 35/36-27-16**\n- Sets a **deadline**: inspections must be completed within **200 hours of flight time** after 30 September 1986\n\n**Why it matters:**\n- **Safety issue**: Cracks had been discovered in these fittings during normal operations\n- **Risk**: If a flap attachment fitting fails, it can cause **asymmetric flaps** — meaning one wing's flaps extend or retract differently than the other. This creates dangerous handling problems and potential loss of control during takeoff or landing\n\n**Who it affects:**\n- Owners and operators of Learjet 35 and 36 aircraft with specific serial numbers (listed in the referenced service bulletin)\n- Maintenance organisations servicing these aircraft\n\nAirworthiness Directives are legally binding safety orders. Compliance is **mandatory** — you cannot legally fly the aircraft until the inspection is done."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-25-flap-attachment-fittings","history":"/api/acts/ad-learjet-35-25-flap-attachment-fittings/history","analysis":"/api/acts/ad-learjet-35-25-flap-attachment-fittings/analysis","conflicts":"/api/acts/ad-learjet-35-25-flap-attachment-fittings/conflicts","importantCases":"/api/acts/ad-learjet-35-25-flap-attachment-fittings/important-cases","documents":"/api/acts/ad-learjet-35-25-flap-attachment-fittings/documents"}}