{"id":"F2006B06082","name":"AD/PC-12/19 - Flap Inboard Attachment Fittings","slug":"ad-pc-12-19-flap-inboard-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114480,"registerId":"commonwealth-F2006B06082-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-12/19 - Flap Inboard 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)  Pilatus PC-12 Series Aeroplanes\n\n \n\nAD/PC-12/19 Flap Inboard Attachment Fittings 9/99\n\nApplicability: PC-12 and PC-12/45 aircraft, serial numbers MSN 101 up to and including MSN 300. Requirement:               Modify the flap inboard attachment fittings in accordance with Pilatus PC-12 Service\n\nBulletin No. 57-004 dated Jun 11, 1999.\n\n \n\nNote: FOCA Switzerland AD HB 99-353 refers.\n\n \n\nCompliance: Within 5 months of the effective date of this Airworthiness Directive. This Airworthiness Directive becomes effective on 9 September 1999.\n\nBackground: During static testing, it was found that under maximum loading conditions the existing flap attachment fitting could buckle.\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 text of the directive sets a single, focused mandatory technical change for a defined set of aircraft and does not indicate any alteration or expansion of that scope from an earlier or different intent. No material change of scope is described in the provided text."},"complexity_factors":["Narrow applicability limited to PC-12 and PC-12/45 with serial numbers MSN 101–300 (Applicability)","Single, prescriptive technical action: modify flap inboard attachment fittings per one specified service bulletin (Requirement)","Fixed, short compliance window of five months from effective date (Compliance)","Dependence on an external technical document (Pilatus Service Bulletin No. 57-004 dated 11 June 1999) for implementation details (Requirement)","Cross-reference to a foreign AD (FOCA Switzerland AD HB 99-353) indicating coordinated regulatory action (Note)"],"plain_english_summary":"Pilatus PC‑12/45 aeroplanes MSN 101–300 must have the flap inboard attachment fittings modified per Pilatus Service Bulletin No. 57‑004 (11 June 1999). This mandatory change, effective 9 September 1999, must be completed within five months because testing showed the existing fitting can buckle under maximum load.\n\nAircraft owners/operators are responsible for obtaining the service bulletin, scheduling and performing the modification, and bearing the associated costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a single structural modification."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined applicability criteria (aircraft model and serial number range)","Single, unambiguous compliance requirement (follow the Service Bulletin)","No cross-references to other legislation beyond a non-binding 'note' about a Swiss authority","No conditional logic, exceptions, or nested provisions","Clear, fixed deadline with no alternative compliance methods"],"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 **Pilatus PC-12 aircraft** (serial numbers 101 through 300) to modify the **flap inboard attachment fittings** — the metal brackets that connect the wing flaps to the aircraft structure.\n\n**Why it matters:** During testing, engineers discovered that under maximum stress conditions, these fittings could **buckle** (bend or collapse). If this happened in flight, it could cause the flaps to fail, potentially leading to loss of control during landing or takeoff.\n\n**Who must act:** Anyone operating a PC-12 or PC-12/45 aircraft with serial numbers between MSN 101 and MSN 300.\n\n**What they must do:** Carry out the modification exactly as described in **Pilatus Service Bulletin No. 57-004** (dated 11 June 1999).\n\n**When:** Within 5 months of 9 September 1999 (so by early 2000).\n\n**Key point:** This is not optional. Non-compliance means the aircraft cannot legally fly in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-19-flap-inboard-attachment-fittings","history":"/api/acts/ad-pc-12-19-flap-inboard-attachment-fittings/history","analysis":"/api/acts/ad-pc-12-19-flap-inboard-attachment-fittings/analysis","conflicts":"/api/acts/ad-pc-12-19-flap-inboard-attachment-fittings/conflicts","importantCases":"/api/acts/ad-pc-12-19-flap-inboard-attachment-fittings/important-cases","documents":"/api/acts/ad-pc-12-19-flap-inboard-attachment-fittings/documents"}}