{"id":"F2006B09491","name":"AD/EMB-110/50 - Automatic Propeller Feathering System","slug":"ad-emb-110-50-automatic-propeller-feathering-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54018,"registerId":"commonwealth-F2006B09491-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/50 - Automatic Propeller Feathering System","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)  \nEmbraer EMB-110 (Bandeirante) Series Aeroplanes\n\nAD/EMB-110/50 Automatic Propeller Feathering System 1/96 DM\n\nApplicability: This Directive is applicable to all EMB-110 aircraft.\n\nRequirement: Inspect the control and test switch of the automatic propeller feathering system in accordance with Embraer Service Bulletin 110-61-0032 dated 6 October 1995.\n\nNote: CTA (Brazil) AD 95-10-01 Amdt 39-749 refers.\n\nCompliance: Unless previously accomplished, then within 50 hours time in service after 17 November 1995.\n\nBackground: A report was received of a malfunction of the automatic feathering mechanism of the EMB-110 propeller. Investigations carried out revealed a hidden failure mode not checked by the preflight feathering test. This failure mode was due to a loss of electrical connection between the control and test switch pins and wires soldered to them. Action required by this Directive is intended to provide early detection of this anomaly.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive addressing a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a one-time inspection."},"complexity_factors":["Single, specific technical requirement with clear reference to external manufacturer document","No defined terms section—uses plain aviation terminology","Simple conditional logic: 'Unless previously accomplished' creates single exception","No cross-references to other legislation beyond noting related Brazilian aviation directive","Extremely short document (under 200 words) with straightforward compliance deadline"],"plain_english_summary":"This is a **safety order** issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft—the **Embraer EMB-110 Bandeirante**, a Brazilian-made twin-engine turboprop plane.\n\n**What it does:**\n- Orders owners and operators of these aircraft to **inspect a specific switch** in the automatic propeller feathering system.\n- \"Feathering\" means turning the propeller blades so they cut through the air with minimal resistance—this is crucial if an engine fails in flight, as it stops the dead engine from creating drag and slowing the plane down.\n\n**Why it matters:**\n- A malfunction was discovered where the **electrical connections inside a control switch could fail silently**—meaning pilots wouldn't know about the problem during normal preflight checks.\n- If this system fails when needed, a pilot might be unable to feather the propeller after an engine failure, making the aircraft harder to control and potentially dangerous.\n\n**Who must act:**\n- Anyone operating an EMB-110 aircraft must complete this inspection within **50 flight hours** after 17 November 1995 (unless already done).\n\n**What the inspection involves:**\n- Following a specific technical procedure laid out in **Embraer Service Bulletin 110-61-0032** (the manufacturer's official repair notice)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated purpose: it requires inspection of the control and test switch of the EMB-110 automatic propeller feathering system to detect a specific soldered-connection failure mode. The applicability to all EMB-110 aircraft and the specified compliance time align with the document's expressed objective (Applicability, Requirement, Compliance, Background). There is no indication in the text that the AD expands beyond that original intent."},"complexity_factors":["Narrow, single-subject requirement (inspect one system component) increases clarity.","Universal applicability to a single aircraft type (all EMB-110s) simplifies target population but concentrates operational impact.","Mandatory compliance window (50 hours TIS after a fixed date) creates a short-term scheduling constraint.","Dependence on an external technical document (Embraer Service Bulletin 110-61-0032) for inspection procedure shifts technical complexity outside the AD.","Limited procedural discretion in the AD itself (it prescribes inspection but not who performs it or specific shop-level steps)."],"plain_english_summary":"Requires all Embraer EMB-110 owners/operators to inspect the automatic propeller feathering control/test switch per Embraer Service Bulletin 110-61-0032, to be done within 50 flight hours after 17 Nov 1995.  \n\nIssued because a reported malfunction traced to intermittent soldered-pin electrical connections could disable automatic feathering; operators bear inspection and repair costs and may face short-term downtime and concentrated maintenance demand."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-50-automatic-propeller-feathering-system","history":"/api/acts/ad-emb-110-50-automatic-propeller-feathering-system/history","analysis":"/api/acts/ad-emb-110-50-automatic-propeller-feathering-system/analysis","conflicts":"/api/acts/ad-emb-110-50-automatic-propeller-feathering-system/conflicts","importantCases":"/api/acts/ad-emb-110-50-automatic-propeller-feathering-system/important-cases","documents":"/api/acts/ad-emb-110-50-automatic-propeller-feathering-system/documents"}}