{"id":"F2006B05321","name":"AD/P166/28 Amdt 1 - Flap Control Bellcrank - Modification","slug":"ad-p166-28-amdt-1-flap-control-bellcrank-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45771,"registerId":"commonwealth-F2006B05321-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/28 Amdt 1 - Flap Control Bellcrank - Modification","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)  Piaggio P166 Series Aeroplanes\n\n \n\n# AD/P166/28\n\nAmdt 1\n\nApplicability: All models.\n\n# Flap Control Bellcrank - Modification 7/64\n\n \n\nDocument: Replace the flap control bellcrank P/N 5313-01 with bellcrank P/N 5313.01A. Compliance:              Forthwith.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment prescribes a specific replacement part for the flap control bellcrank across all Piaggio P166 models (Document; Applicability: All models). The directive's scope is a targeted hardware substitution rather than an expansion to new aircraft types or new operational rules; it remains focused on modifying the bellcrank component. The text contains no provision that broadens the subject matter beyond this component replacement."},"complexity_factors":["Single mandatory action: replace one part specified by part numbers (clarity reduces complexity)","Immediate compliance requirement (\"Forthwith\") increases operational urgency and scheduling complexity","Applies to all models of the Piaggio P166 series (broad applicability raises logistical scope)","Specification of exact part numbers (precision reduces legal ambiguity but creates procurement dependency)","No installation procedures, testing steps, or record-keeping instructions included in the text (creates reliance on external maintenance data)","No alternative compliance options or deferral mechanisms stated (limits administrative flexibility)","No cost, supply or lead-time information provided (adds uncertainty for operators)"],"plain_english_summary":"The directive mandates that all Piaggio P166 series aeroplanes have the flap control bellcrank P/N 5313‑01 removed and replaced immediately with P/N 5313.01A. Owners and operators must procure the part, fund and schedule the installation, and have maintenance organisations or licensed engineers perform and record the work; the text gives no installation instructions, alternatives, or deferral options."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","No defined terms section","No cross-references to other legislation or regulations","Single, unambiguous compliance requirement","No conditional logic or exceptions","Clear applicability statement ('All models')","Simple part-number substitution instruction"],"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) that requires aircraft owners and operators to fix a specific mechanical problem.\n\n**What it does:** It orders the replacement of a faulty part on Piaggio P166 series aeroplanes (a type of Italian-made twin-engine aircraft). Specifically, owners must swap out the **flap control bellcrank** (a lever mechanism that helps control the aircraft's flaps — the movable surfaces on the wings that help with takeoff and landing) with an improved version.\n\n**Who it affects:** Anyone who owns or operates any model of Piaggio P166 aircraft in Australia.\n\n**What must be done:** Replace part number 5313-01 with the new part number 5313.01A.\n\n**When:** **Forthwith** — meaning immediately, without delay. This is urgent.\n\n**Why it matters:** Flap control is critical for safe landing and takeoff. A faulty bellcrank could cause the flaps to malfunction, potentially leading to loss of control during these critical flight phases. This directive prevents accidents by forcing immediate corrective action."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-28-amdt-1-flap-control-bellcrank-modification","history":"/api/acts/ad-p166-28-amdt-1-flap-control-bellcrank-modification/history","analysis":"/api/acts/ad-p166-28-amdt-1-flap-control-bellcrank-modification/analysis","conflicts":"/api/acts/ad-p166-28-amdt-1-flap-control-bellcrank-modification/conflicts","importantCases":"/api/acts/ad-p166-28-amdt-1-flap-control-bellcrank-modification/important-cases","documents":"/api/acts/ad-p166-28-amdt-1-flap-control-bellcrank-modification/documents"}}