{"id":"F2006B06215","name":"AD/PHZL/53 Amdt 2 - Blade Clamps","slug":"ad-phzl-53-amdt-2-blade-clamps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47112,"registerId":"commonwealth-F2006B06215-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/53 Amdt 2 - Blade Clamps","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPropellers \\- Variable Pitch \\- Hartzell\n\nAD/PHZL/53\n\nAmdt 2\n\n  \nBlade Clamps 5/89\n\nApplicability: All model ( )HC-( ) ( )(X,V) Series propellers fitted with P/No C-3-( ) blade clamp assemblies.\n\nRequirement: 1. Replace all propeller blade clamp assemblies S/No. 0 to D5293 or inspect as follows:\n\n    (a) Visually inspect the internal inboard radius area of the clamp, especially next to the clamp bolt hole, for corrosion. Remove from service all clamps showing signs of corrosion.\n\n    (b) Magnetic particle inspect all internal and external surfaces of the clamp in accordance with Hartzell specification No H-S-7.\n\n    (c) Dye penetrant inspect all external surfaces of clamp assemblies S/No 0 to D5293 which, after initial inspection 1(a) and 1(b), remain in service.\n\n    2. Replace all propeller blade clamp assemblies which have mismatching serial numbers on each clamp half or have unreadable serial numbers.\n\n    3. Carry out the following on propeller blade clamp assemblies with S/No. D5294 to K6336:\n\n    (a) using a 10x power magnifying glass, inspect the inner bearing race radius, especially next to the inner clamp bolt hole, for defects in the form of corrosion, tool marks, gouges, scratches, etc.\n\n    (b) remove all evidence of defects in the clamp inner bearing race radius. Replace all reworked clamps that exceed the rework limitations defined in SI No. 159B.\n\n    (c) magnetic particle inspect the clamp for evidence of cracks in accordance with Hartzell Specification H-S-7. Replace all cracked clamps.\n\n    (d) replate all reworked clamps before placing back in service in accordance with Hartzell Specification H-S-5.\n\nNote: Hartzell SI No 159B and FAA AD85-14-10 Amdt 39-5414 refer.\n\nCompliance: Except for requirement 1(C), at next overhaul, recondition or repair which necessitates disassembly after 30 November 1986 or within 12 months, whichever occurs first. For requirement 1 (C), inspect clamps at each inspection for issue of maintenance release.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBackground: Due to the high stresses in this area, surface damage of any type impairs the airworthiness of the clamp. This Directive has been amended to provide an additional inspection as an alternative to replacement of some clamps. This directive further amended to clarify the S/No 0 to D5293 clamp inspection requirements.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"This is Amendment 2 to an existing directive. The background note explicitly states the directive has been expanded from its original form: it now provides 'an additional inspection as an alternative to replacement' (broadening options) and was further amended 'to clarify' requirements for the 0-D5293 serial range. The original likely mandated replacement only; this version adds inspection alternatives, effectively growing the scope to include both replacement and detailed inspection pathways."},"complexity_factors":["Multiple serial number ranges with different treatment requirements (0-D5293 vs D5294-K6336)","Nested conditional logic: Requirement 1 offers replacement OR inspection pathway, with 1(c) applying only to clamps that remain in service after 1(a) and 1(b)","Cross-references to external technical documents (Hartzell Specification H-S-7, H-S-5, and Service Instruction No. 159B, plus FAA AD85-14-10)","Specific technical inspection methods referenced by standard numbers rather than described in full (magnetic particle, dye penetrant)","Compliance timing varies by sub-requirement (1(c) has different deadline than 1(a) and 1(b))"],"plain_english_summary":"This AD requires inspections, repairs, or replacement of Hartzell variable-pitch propeller C‑3 series blade clamps based on serial-number groups: older clamps must be replaced or undergo corrosion, magnetic-particle, and dye‑penetrant checks; mid-range clamps need close visual inspection, limited repairs, magnetic testing and replating; clamps with mismatched or unreadable serials must be replaced immediately. \n\nIt affects owners/operators and maintenance shops for HC‑series propellers. Compliance is at next overhaul/reconditioning or within 12 months, with dye‑penetrant checks at every maintenance release."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Amendments added an inspection alternative to outright replacement for some clamps and clarified inspection requirements for clamps S/No. 0 to D5293 (Background). The directive therefore broadened accepted maintenance options while refining which serial-numbered clamps must be inspected or replaced."},"complexity_factors":["Multiple serial-number ranges with different required actions (S/No. 0 to D5293; D5294 to K6336) increasing procedural branching (Requirement 1; Requirement 3).","Several inspection techniques mandated (visual, magnetic-particle per Hartzell H-S-7, dye penetrant) requiring specialised equipment and qualified personnel (Requirements 1(a)–(c), 3(c)).","Rework and replate rules with external manufacturing/maintenance specifications and limits (Hartzell SI No. 159B, H-S-5) add dependency on manufacturer documents and acceptance criteria (Requirement 3(b),(d); Note).","Specific administrative requirement to replace clamps with mismatching or unreadable serial numbers creates an enforcement/compliance trigger (Requirement 2).","Staggered compliance timing: most work at next overhaul/recondition/repair after 30 Nov 1986 or within 12 months, but one inspection requirement (1(c)) must occur at each inspection for issue of maintenance release, complicating scheduling (Compliance).","References to external directives (FAA AD85-14-10) and manufacturer service instructions require cross-referencing and may impose further technical detail not reproduced in the directive (Note).","Operational cost and scheduling burdens fall on aircraft owners/operators and maintenance organisations who decide whether to repair, rework, replate or replace clamps (implicit in Requirements and Compliance)."],"plain_english_summary":"Requires owners/operators and maintenance organisations to inspect or replace specific Hartzell P/No C-3-( ) propeller blade clamp assemblies by serial-number range for corrosion, cracks and surface damage, using visual, magnetic-particle and dye-penetrant methods, and to replate or replace clamps that fail limits. Timing ties to next overhaul/recondition/repair (or 12 months) with one inspection item required at each maintenance-release inspection; affects those who maintain or own affected HC-series propeller-equipped aircraft and who pay for the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-53-amdt-2-blade-clamps","history":"/api/acts/ad-phzl-53-amdt-2-blade-clamps/history","analysis":"/api/acts/ad-phzl-53-amdt-2-blade-clamps/analysis","conflicts":"/api/acts/ad-phzl-53-amdt-2-blade-clamps/conflicts","importantCases":"/api/acts/ad-phzl-53-amdt-2-blade-clamps/important-cases","documents":"/api/acts/ad-phzl-53-amdt-2-blade-clamps/documents"}}