{"id":"F2006B06202","name":"AD/PHS/9 - Model 54H60 Pitch Lock Regulator Assembly - Inspection and Modification","slug":"ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47080,"registerId":"commonwealth-F2006B06202-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/9 - Model 54H60 Pitch Lock Regulator Assembly - Inspection and 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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Variable Pitch - Hamilton Standard\n\n \n\nAD/PHS/9  Model 54H60 Pitch Lock Regulator Assembly - Inspection and Modification\n\nApplicability: Propeller models 54H60-81, 91, 117, 125. Document:  Hamilton Standard SB 54H60, No.-59 Rev. 1.\n\nNote: FAA AD 75-03-05 refers.\n\n \n\nCompliance: In accordance with the requirement document.\n\n \n\nBackground:  To reduce the possibility of separation of the pitchlock extension sleeve, modifications are introduced to the retention thread and surge valve housing.\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\n11/81\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument, as presented, sets a mandatory inspection and modification requirement for specified Model 54H60 propellers and directs compliance to a manufacturer service bulletin. The text provides no evidence that the scope has been changed from an earlier intent; it states the applicability, references the technical document, and gives the stated safety purpose (reduce possibility of separation of the pitchlock extension sleeve) without indicating any change in scope."},"complexity_factors":["Relies on an external technical requirement document (Hamilton Standard SB 54H60 No.-59 Rev. 1) for the operative steps (Compliance / Document).","Narrow applicability to specific propeller submodels, requiring identification of affected equipment (Applicability).","Technical modifications to mechanical components (retention thread and surge valve housing) require specialised maintenance skills and parts (Background).","Cross‑reference to an FAA AD creates an inter‑regulatory link to another regulator’s action (Note).","The AD text does not specify timing, cost allocation, or detailed procedures, so implementation details depend on the service bulletin."],"plain_english_summary":"This Airworthiness Directive from CASA applies to Hamilton Standard Model 54H60 variable‑pitch propellers and mandates inspections and modifications of the pitch‑lock regulator assembly per Hamilton Standard Service Bulletin 54H60 No.-59 Rev.1. It aims to reduce risk of separation of the pitchlock extension sleeve by altering retention features, and therefore affects aircraft operators, owners and maintenance organisations responsible for affected propellers."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical component. It has not expanded beyond its original purpose of addressing the pitchlock extension sleeve separation risk. The scope remains precisely limited to the four specified propeller models."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond a single service bulletin and FAA AD reference","Simple conditional structure: if you have this propeller model, you must comply","Single compliance pathway with no exceptions or alternative methods of compliance stated","Technical content is externalised to the referenced Service Bulletin rather than included in the directive itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates specific safety work on certain aircraft propellers.\n\n**What it does:**\n- Requires inspection and modification of the **pitch lock regulator assembly** on specific Hamilton Standard propeller models (54H60-81, 91, 117, and 125).\n- The modification involves changes to the **retention thread** and **surge valve housing** to prevent the **pitchlock extension sleeve** from separating (coming loose or falling off).\n\n**Who it affects:**\n- Owners and operators of aircraft fitted with these specific Hamilton Standard propeller models.\n- Maintenance organisations servicing these propellers.\n\n**Why it matters:**\n- If the pitchlock extension sleeve separates, it could cause the propeller to malfunction, potentially leading to loss of control or engine damage. This directive prevents that failure mode.\n- Compliance is mandatory under Australian civil aviation law. The \"Compliance\" section states operators must follow the referenced Hamilton Standard Service Bulletin.\n\n**Key documents referenced:**\n- **Hamilton Standard Service Bulletin 54H60, No.-59 Rev. 1** (the technical instruction manual for the fix).\n- **FAA AD 75-03-05** (the equivalent US safety directive, showing this aligns with international standards)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification","history":"/api/acts/ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification/history","analysis":"/api/acts/ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification/analysis","conflicts":"/api/acts/ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification/important-cases","documents":"/api/acts/ad-phs-9-model-54h60-pitch-lock-regulator-assembly-inspection-and-modification/documents"}}