{"id":"F2006B06178","name":"AD/PFP/3 Amdt 3 - Fairey Metal Propellers","slug":"ad-pfp-3-amdt-3-fairey-metal-propellers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47026,"registerId":"commonwealth-F2006B06178-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PFP/3 Amdt 3 - Fairey Metal Propellers","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 \\- Fixed Pitch\n\nAD/PFP/3\n\nAmdt 3\n\n  \nFairey Metal Propellers 10/88\n\nApplicability: All Fairey Metal propellers. Requirement: 1. Daily Inspection:\n\nCarefully examine the blade sheet for cracks on both sides and both edges in the region adjacent to the boss and identification stamping. This inspection may be made visually and without removing the propeller from the aircraft. Withdraw from service any propeller found to be cracked.\n\nNote: Daily inspection may be performed and certified by the pilot or owner.\n\n    2. Half Overhaul Period Inspection:\n\nRemove the propeller from the hub and the boss blocks from the blade sheet. Clean the blade sheet and inspect for cracks, particularly in the vicinity of the bolt holes and in regions where any fretting or corrosion has occurred. This inspection shall be made under strong diffused illumination using a suitable microscope with magnification in the range 15 to 25 diameters. Withdraw from service any propeller found to be cracked.\n\nIf no cracks are found, remove any fretting or corrosion from the blade sheet and boss blocks by means of coarse emery followed by fine emery.\n\nBefore re-assembly, ensure that the boss blocks are correctly fitted to the blade sheet using the blueing method. At least 80 per cent contact shall be achieved and at no place shall there be more than .002-in. clearance between boss blocks and blade sheet. This mating of surfaces shall be obtained without bolt pressure of any kind. A light tap with a mallet on the faces of the boss, which is held in alignment on the blade sheet by a suitable mandrel, is all that is permitted to obtain a blade marking.\n\n    3. Overhaul:\n\nAt the specified overhaul period, inspect and re- condition the propeller in accordance with Fairey Aviation Specification No. FAC1. In addition, carry out the following operations:\n\n    (a) Check fitment of boss blocks to blade sheet by the blueing method as prescribed in sub-paragraph 2 above.\n    (b) At each overhaul, anodise the propeller blade sheet and inspect for cracks. The anodic treatment shall be carried out in accordance with specification DTD 910 (latest issue) or other approved specification.\n\nWhen above contact is achieved ensure any exposed bare metal is reprotected using Alodine or varnish as detailed in Fairey Aviation specification FAC 1.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nCompliance: For Para. 1 \\- At each daily or overnight inspection.\n\nFor Para. 2 \\- Within 50 hours time in service of the mid- overhaul period.\n\nFor Para. 3 \\- Before installation in an aircraft following each overhaul completed after 30 August 1965.\n\nExemption: Notwithstanding the foregoing, propellers which have completed between 300 and 500 hours time in service since last overhaul before 30 August 1965 and have been inspected in that period in accordance with DCA Special Inspection Fairey/61/1 are hereby exempted from the inspection requirement of para. 2 during that current overhaul period.\n\nBackground: Recently a Fairey propeller was found assembled with barium chromate as the jointing compound. Use of an extrudable substance in this application can cause loss of hub bolt torque.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This Amendment 3 imposes explicit, mandatory inspection and overhaul procedures applicable to all Fairey Metal propellers, adds technical fit and surface‑treatment requirements (blueing method, anodising per DTD 910/FAC1), and includes a narrow exemption for propellers with 300–500 hours since overhaul inspected under DCA Special Inspection Fairey/61/1. It therefore tightens procedural scope and materials/assembly controls compared with an unspecified prior state."},"complexity_factors":["Multiple inspection tiers with different actions and timing: daily, mid‑overhaul (within 50 flight hours), and overhaul (before reinstallation after overhaul)","Technical inspection standards: microscope magnification requirement (15–25×), strong diffused illumination, and specific fit tolerances (≥80% contact, ≤0.002 in clearance)","Procedural requirements for removal, cleaning, fretting/corrosion treatment (coarse then fine emery), anodising to DTD 910 or approved spec, and re‑protection methods (Alodine or varnish) referenced to Fairey Specification FAC1","Permitted certifier for daily checks is non‑technical (pilot or owner), but mid‑overhaul and overhaul require specialised inspection equipment and reconditioning","A limited exemption clause for propellers with 300–500 hours since overhaul creates a conditional carve‑out to the mid‑overhaul inspection","Background safety rationale (barium chromate found) introduces a materials/assembly risk focus that drives the specific measures"],"plain_english_summary":"This Airworthiness Directive sets mandatory inspection and overhaul steps for all Fairey Metal fixed‑pitch propellers. It requires daily visual checks (pilot or owner may certify), a mid‑overhaul blade‑sheet inspection under 15–25× magnification after removal, and specified overhaul treatments including anodising and a ‘‘blueing’’ fit check; cracked propellers must be withdrawn.\n\nThe Authority says the measures respond to a discovery of barium chromate jointing compound that can reduce hub‑bolt torque. The rules shift inspection and reconditioning duties and costs to operators and require specific tools, skills and materials to comply."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a straightforward amendment to an existing Airworthiness Directive. The scope remains tightly focused on inspection and maintenance requirements for Fairey metal propellers. The amendment adds specific technical requirements (anodising, blueing method specifications) and addresses a specific safety issue (barium chromate jointing compound), but does not expand beyond the original purpose of ensuring airworthiness of these specific propellers."},"complexity_factors":["Technical aviation terminology throughout (e.g., 'boss blocks', 'blueing method', 'anodise', 'fretting')","Three distinct inspection regimes with different compliance timeframes","Specific technical specifications referenced (Fairey Aviation Specification FAC1, DTD 910)","Precise measurement requirements (0.002-inch clearance, 80% contact, 15-25x magnification)","Conditional exemption clause with specific hour ranges (300-500 hours) and date cutoff (30 August 1965)","Cross-reference to prior inspection standard (DCA Special Inspection Fairey/61/1)"],"plain_english_summary":"This rule requires owners, operators, and mechanics of Fairey metal propellers to follow a stepped inspection and maintenance regime — from daily visual checks through intermediate microscope inspections to full overhauls with anodising and reassembly per manufacturer instructions — to detect and prevent blade or hub cracking. It was tightened after wrong sealant use (barium chromate) was found to loosen bolts; a limited exemption covers propellers previously inspected under an earlier directive."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pfp-3-amdt-3-fairey-metal-propellers","history":"/api/acts/ad-pfp-3-amdt-3-fairey-metal-propellers/history","analysis":"/api/acts/ad-pfp-3-amdt-3-fairey-metal-propellers/analysis","conflicts":"/api/acts/ad-pfp-3-amdt-3-fairey-metal-propellers/conflicts","importantCases":"/api/acts/ad-pfp-3-amdt-3-fairey-metal-propellers/important-cases","documents":"/api/acts/ad-pfp-3-amdt-3-fairey-metal-propellers/documents"}}