{"id":"F2006B10314","name":"AD/GOV/8 - Woodward Combined Power Turbine and Propeller Governor - Feather Check","slug":"ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56054,"registerId":"commonwealth-F2006B10314-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GOV/8 - Woodward Combined Power Turbine and Propeller Governor - Feather Check","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propeller Governors\n\n \n\nAD/GOV/8 Woodward Combined Power Turbine and\n\nPropeller Governor - Feather Check\n\n\n10/82\n\n \n\nApplicability: Woodward propeller governors P/N 8210-018 (DDA 6875708), installed on Allison 250-B15G, B17, B17B, B17C engines, and included in the serial number schedule listed in the compliance document.\n\n \n\nDocument: 1. Woodward SB. 33577; or\n\n \n\n2. Allison 250 CEB A-87 and Allison 250 CEB A-1151.\n\n \n\nNote: FAA AD 82-12-04 refers.\n\n \n\nCompliance: Within 50 hours time in service after 20 September, 1982.\n\n \n\nBackground:  A manufacturing calibration error which could cause slow propeller feathering or the inability to feather may exist in a group of governors.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive targeting a specific manufacturing defect in specific equipment. It has not expanded beyond its original purpose of mandating a one-time inspection/check for a known calibration error."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined part numbers and 4 engine models in applicability section","Single compliance requirement with clear deadline (50 hours time in service after fixed date)","No nested exceptions or conditional logic","Simple binary compliance path (follow either Document 1 OR Document 2)","No cross-references to other legislation beyond noting equivalent FAA directive","Straightforward background explanation without technical sub-clauses"],"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 like a compulsory recall notice, but for aircraft parts rather than cars.\n\n**What it does:** It requires owners and operators of specific aircraft engines to check their **propeller governors** — the devices that control propeller speed and pitch. The check must happen within 50 hours of flying time after 20 September 1982.\n\n**Who it affects:** Anyone operating aircraft with:\n- **Woodward propeller governors** (part numbers 8210-018 or DDA 6875708)\n- Installed on **Allison 250-B15G, B17, B17B, or B17C engines**\n- Specifically those with serial numbers listed in the compliance documents\n\n**Why it matters:** A **manufacturing mistake** in some governors could cause two dangerous problems:\n- **Slow propeller feathering** — the propeller takes too long to stop spinning and align with the airflow (feathering is what you do when an engine fails, to reduce drag)\n- **Complete inability to feather** — the propeller keeps windmilling, creating massive drag that could make the aircraft uncontrollable if an engine fails\n\n**What must be done:** Operators must follow the procedures in either:\n- Woodward Service Bulletin 33577, **or**\n- Allison 250 CEB A-87 and A-1151\n\nThis directive references an equivalent US Federal Aviation Administration (FAA) order (AD 82-12-04), showing Australia was harmonising its safety standards with international regulators."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to Woodward propeller governors P/N 8210-018 (DDA 6875708) with serial numbers listed in the compliance document and installed on specified Allison 250 engine models. The instrument prescribes a one-off check to be done within a stated 50-hour window and references specific service documents for the technical procedure. Nothing in the text indicates an expansion or narrowing of that original applicability or requirements beyond what is stated in the headings \"Applicability\", \"Document\", \"Compliance\" and \"Background\"."},"complexity_factors":["Narrow technical scope: applies to a single part number and specified serial numbers (Applicability)","Requires consulting external technical documents (Woodward SB 33577; Allison 250 CEB A-87 and A-1151) for the detailed procedure (Document)","Fixed and short compliance window tied to flight hours (50 hours after 20 September 1982) which affects maintenance scheduling (Compliance)","Operational identification step: implementer must verify serial numbers against a separate serial number schedule listed in the compliance document (Applicability)","Technical nature of the fault (feathering calibration) requires qualified maintenance actions but the directive does not itself specify the repair steps (Background; Document)"],"plain_english_summary":"This AD mandates a one‑off feathering check of Woodward propeller governors (P/N 8210‑018 / DDA 6875708) installed on specified Allison 250‑B15G/B17 series engines because a possible manufacturing calibration error could slow or prevent propeller feathering. Operators/maintenance organisations must identify affected serial numbers (per the referenced service documents), perform the check and any corrective action within 50 hours TIS after 20 Sept 1982, and bear the associated cost."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check","history":"/api/acts/ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check/history","analysis":"/api/acts/ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check/analysis","conflicts":"/api/acts/ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check/conflicts","importantCases":"/api/acts/ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check/important-cases","documents":"/api/acts/ad-gov-8-woodward-combined-power-turbine-and-propeller-governor-feather-check/documents"}}