{"id":"F2017L00127","name":"AD/PHS/10 Amdt 2\t- Hydromatic Propeller - Aluminium Blades","slug":"ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":95810,"registerId":"commonwealth-F2017L00127-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Hamilton S","sectionType":"division","heading":"Propellers - Variable Pitch - Hamilton Standard","content":"### Propellers - Variable Pitch - Hamilton Standard\n\n| AD/PHS/10 Amdt 2 | Hydromatic Propeller - Aluminium Blades | 4/2017 |\n| ---------------- | --------------------------------------- | ------ |\n\n| Applicability: | Hamilton Standard Hydromatic (non-counterweighted) propellers with aluminium blades that use engine oil for pitch control (does not apply to propellers with integral oil control or to propellers with steel blades) of the following types: 22D30, 22D40, 23D40, 23E50, 23E60, 24D50, 24E60, 33D50, 33E60, 34D50, 34D51, 34E60, 43D50, 43D51, 43E60, and 43H60, as installed on an aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Remove blades and visually inspect for evidence of corrosion in the blade fillet and shank area, particularly under the Teflon friction reduction strip and the resin corrosion barrier, in accordance with Hamilton Standard Aluminium Blade Overhaul Manual No. 130B dated 1 March 1980, as in force at the date of this AD.2. For propellers fitted to Limited Category aircraft for which the Australian Warbirds Association Ltd (AWAL) is the administering authority under Part 132 of CASR 1998:Comply with the requirements in AWAL Maintenance Direction No: 16-001, as in force from time to time.                                                                                                                                                                                                                                                        |\n| Compliance:    | 1. For propellers, other than those described in requirement 2:At periods not exceeding 6 years calendar time in service.2. For propellers described in requirement 2:As detailed in AWAL Maintenance Direction No: 16-001, as in force from time to time.Note 1: AWAL Maintenance Direction No: 16-001 expresses additional requirements at the Annual inspection of the propeller. The blade removal inspection must be completed at periods not exceeding 12 years calendar time in service.Note 2: Calendar periods are deemed to commence from the time the propeller is first installed on an aircraft following reconditioning or inspection in accordance with the AD and shall be uninterrupted including all subsequent service and storage periods.Note 3: The AWAL Maintenance Direction does not apply to any aircraft that has been flown off salt water. |\n|                | This AD commences on 20 February 2017.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | The FAA advise the possibility of fatigue cracking, leading to blade separation, initiated by severe corrosion around the shank and blade fillet area, particularly under the Teflon friction strip. FAA AD 81-13-06 R2 refers.Amendment 1 (1987) of this Directive was issued to extend the inspection period after initial inspection.Amendment 2 of this AD allows for Limited Category aircraft administered by the Australian Warbird Association Ltd to have an extended inspection period by compliance with the requirements contained in AWAL Maintenance Direction 16-001.AWAL requested that CASA review the AD and submitted maintenance reports and statements that demonstrated that no significant corrosion had been found at the previous propeller disassembly inspections at the 6 yearly intervals.                                                 |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n15 February 2017","sortOrder":0},{"sectionNumber":"AD/PHS/10 Amdt 2","sectionType":"part","heading":"AD/PHS/10 Amdt 2","content":"## AD/PHS/10 Amdt 2","sortOrder":1},{"sectionNumber":"Hydromatic Propeller - Aluminium Blades","sectionType":"part","heading":"Hydromatic Propeller - Aluminium Blades","content":"## Hydromatic Propeller - Aluminium Blades","sortOrder":2},{"sectionNumber":"4/2017","sectionType":"part","heading":"4/2017","content":"## 4/2017","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Amendment 2 modifies the original AD by allowing Limited Category aircraft administered by the Australian Warbirds Association Ltd to comply with AWAL Maintenance Direction No.16‑001 instead of the standard AD inspection timetable. This introduces an alternative inspection regime (with a blade removal inspection cap of 12 years and additional annual requirements in AWAL MD) and retains exclusions (integral oil control, steel blades, and aircraft flown off salt water)."},"complexity_factors":["Multiple specific propeller model numbers listed for applicability (narrow technical scope increases administrative complexity).","Technical inspection requirement: blade removal and visual inspection of fillet/shank area under Teflon/resin barriers (requires trained maintenance personnel and overhaul manual reference).","External documentary references: Hamilton Standard Aluminium Blade Overhaul Manual No.130B and AWAL Maintenance Direction No.16‑001 (requires cross‑referencing and staying current with those documents).","Different compliance regimes: general 6‑year calendar inspection interval versus alternative AWAL intervals and a 12‑year blade removal cap for some Limited Category aircraft (complex scheduling and recordkeeping).","Exclusions and caveats: does not apply to propellers with integral oil control or steel blades, and AWAL alternative does not apply to aircraft flown off salt water (requires fleet‑level applicability assessment).","Calendar time counting rule from reconditioning/inspection events and uninterrupted service/storage periods (creates precise timing and compliance-tracking obligations)."],"plain_english_summary":"This AD requires owners/operators of specified Hamilton Standard Hydromatic aluminium-blade, oil‑controlled, non‑counterweighted propellers to remove blades and visually inspect the blade fillet and shank (especially under the Teflon friction strip and resin barrier) for corrosion, following Hamilton Standard Manual No.130B. The AD lets Limited Category aircraft administered by the Australian Warbirds Association Ltd (AWAL) follow AWAL Maintenance Direction No.16‑001 (which permits extended intervals for some inspections). Owners/operators pay for inspections; CASA issues the requirement and AWAL may set an alternative schedule."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original AD (1981, per FAA AD 81-13-06) was a straightforward corrosion inspection requirement. Amendment 1 (1987) extended inspection periods after initial compliance. Amendment 2 (2017) significantly expanded the scope by creating a special regulatory pathway for Limited Category warbird aircraft, introducing a delegated authority arrangement (AWAL), and effectively bifurcating the compliance regime based on aircraft category and operating environment (salt water exclusion). This moved beyond pure safety engineering to accommodate heritage aviation operational realities."},"complexity_factors":["Multiple applicability exclusions (integral oil control, steel blades) requiring careful model identification","Dual compliance pathways with different timeframes (6-year vs 12-year cycles)","Cross-reference to external documents: Hamilton Standard Manual 130B and AWAL Maintenance Direction 16-001","Conditional logic for Limited Category aircraft with specific administering authority requirement","Calendar time calculation rules with 'uninterrupted' service/storage periods (Note 2)","Specific exclusion for salt-water flown aircraft in the AWAL pathway"],"plain_english_summary":"This AD mandates periodic removal and visual inspection of certain Hamilton Standard aluminium-blade, oil-controlled propellers to detect hidden corrosion under protective coatings that can cause fatigue cracking and blade separation. It targets affected operators of those propellers to prevent catastrophic in‑flight failure.\n\nStandard aircraft must inspect every 6 years; Australian warbird/limited‑category aircraft may use a 12‑year interval if they follow AWAL Maintenance Direction 16‑001."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades","history":"/api/acts/ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades/history","analysis":"/api/acts/ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades/analysis","conflicts":"/api/acts/ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades/conflicts","importantCases":"/api/acts/ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades/important-cases","documents":"/api/acts/ad-phs-10-amdt-2-hydromatic-propeller-aluminium-blades/documents"}}