{"id":"F2006B06070","name":"AD/PB/4 - Wooden Propeller Blades - Inspection","slug":"ad-pb-4-wooden-propeller-blades-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114468,"registerId":"commonwealth-F2006B06070-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PB/4 - Wooden Propeller Blades - Inspection","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 \\- Beechcraft\n\nAD/PB/4 Wooden Propeller Blades \\- Inspection 9/76\n\nApplicability: All Beech Aircraft Corporation B200, R201, R202, R203 and 214 series propellers having Beech Aircraft Corporation manufactured B200, R201, R203, 214 or 272 series wooden blades installed.\n\nRequirement: A. Within the next 100 hours time in service or one year, which- ever comes first, after 31 October 1976, and thereafter at intervals not to exceed 300 hours time in service or five years, whichever comes first, from the last inspection, visually inspect the blades as follows:\n\n    Carefully remove the plastic coating to expose the shank of the blade for a minimum distance of 4-1/2\" outboard of the ferrule.\n\n    2. Using a 10-power glass, visually inspect the blade surface for cracks and separation as shown on the reproduction of a deteriorated blade in Figure 1.\n\n    3. If no deterioration is found, reinstall the plastic film over the exposed area in accordance with Univair Process (P-200) or an equivalent procedure.\n\n    4. If the blade shows any sign of deterioration, remove it from service and replace it with a serviceable blade before further flight.\n\n    B. Within 100 hours time in service or one year, whichever comes first, after 31 October 1976 and thereafter at intervals not exceeding 100 hours, visually inspect the blade leading edge and tips as follows:\n\n    Using a 10-power magnifying glass examine the tipping area for cracks in the plastic coating coming from under the tipping.\n\n    2. Check for looseness of the tip and leading edge sheathing by holding the blade securely and gripping the sheathing by hand and attempting to flex the tipping while visually observing for relative motion between the piece to which force is applied and adjacent sheathing and blade.\n\n    3. If any of the above conditions are noted, replace the blade with a serviceable blade before further flight.\n\nor FAA AD 76-10-12.\n\nCompliance: In accordance with the requirement.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![Wooden propeller blades](image.002.png)  \n\nFigure 1.","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":3,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive with a narrow, specific scope — inspection of wooden propeller blades on particular Beechcraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive focused on one specific maintenance task","Only 5 defined model series in applicability section","Two distinct inspection requirements with clear intervals (100 hours/1 year vs 300 hours/5 years)","Simple conditional logic: inspect → if damaged then replace, if clean then reseal","References external FAA directive (76-10-12) as alternative compliance path","No nested exceptions or complex cross-referencing within the instrument itself","Technical but precise language appropriate for aviation maintenance (e.g., '10-power glass', 'ferrule', 'sheathing')"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of certain Beechcraft wooden propeller blades to perform regular inspections to detect hidden cracks, separation, or loose sheathing and to replace any defective blades.  \n\nIt requires two recurring inspection routines at defined intervals and specific techniques (coating removal, magnified inspection, and manual checks). It’s aimed at preventing in‑flight propeller failure and ensuring safety."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope is confined to the listed Beech propellers with Beech wooden blades and sets inspection/replacement requirements for those items. The instrument does not expand applicability beyond the specified models or add new categories of parts; it prescribes procedural inspections and intervals for that defined set (Applicability; Requirement)."},"complexity_factors":["Technical inspection steps (remove plastic coating 4½\" outboard of ferrule; 10× magnifier) increase procedural specificity and training needs (Requirement A.1–A.2; B.1).","Multiple interval regimes (initial 100 hours/1 year; then 300 hours/5 years for A; 100 hours/1 year then 100 hours for B) add scheduling complexity (Requirement A; B).","Operational burden on owners/operators who must perform inspections and pay for blade removal/replacement if deterioration is found (Requirement A.4; B.3).","Use of non‑specific terms like \"equivalent procedure\" and \"serviceable blade\" creates some interpretive discretion for maintainers and regulators (Requirement A.3; A.4; B.3).","Cross‑reference to FAA AD 76‑10‑12 creates dependency on another instrument for compliance options (Compliance).","Applicability limited to specific Beech propeller and blade series narrows overall scope but requires accurate fleet identification (Applicability)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Beech variable-pitch propellers fitted with Beech wooden blades to carry out regular visual inspections and to remove and replace any blade that shows deterioration. Inspections set precise actions (remove plastic coating for 4½\" outboard of the ferrule, use a 10× magnifier, check tips and sheathing) and fixed intervals; an FAA AD may be used as an alternative (Applicability; Requirement A–B)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pb-4-wooden-propeller-blades-inspection","history":"/api/acts/ad-pb-4-wooden-propeller-blades-inspection/history","analysis":"/api/acts/ad-pb-4-wooden-propeller-blades-inspection/analysis","conflicts":"/api/acts/ad-pb-4-wooden-propeller-blades-inspection/conflicts","importantCases":"/api/acts/ad-pb-4-wooden-propeller-blades-inspection/important-cases","documents":"/api/acts/ad-pb-4-wooden-propeller-blades-inspection/documents"}}