{"id":"F2006B06183","name":"AD/PFP/9 Amdt 1 - Propeller Mounting Bolts - Inspection and Torque Check","slug":"ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47037,"registerId":"commonwealth-F2006B06183-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PFP/9 Amdt 1 - Propeller Mounting Bolts - Inspection and Torque Check","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 - Fixed Pitch\n\n \n\nAD/PFP/9\n\nAmdt 1\n\n\nPropeller Mounting Bolts - Inspection NK and Torque Check\n\n \n\nApplicability: All McCauley and Sensenich fixed pitch metal propellers.\n\n \n\nRequirement: 1. Inspect propeller mounting bolts by magnetic particle method whenever the propeller is removed from the engine for reconditioning or repair.\n\n \n\n2. The propeller mounting bolt torque shall be checked at intervals not exceeding 500 hours time in service.\n\n \n\nCompliance: As above.\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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific maintenance task for specific propeller models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 substantive requirements with clear, unconditional language","No defined terms section or interpretation provisions","No cross-references to other legislation or regulations","Simple applicability statement with no exceptions or conditions","Straightforward compliance timing ('As above' referring to the requirement itself)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on aircraft propellers.\n\n**What it does:**\nThis directive sets two safety requirements for **McCauley and Sensenich fixed-pitch metal propellers** (common on small aircraft):\n\n1. **Magnetic particle inspection of mounting bolts** — Whenever a propeller is taken off the engine for reconditioning or repair, the bolts that hold it on must be checked using a special magnetic testing method. This detects tiny cracks or flaws that could cause the bolt to fail.\n\n2. **Torque check every 500 hours** — The tightness (torque) of the propeller mounting bolts must be checked at least once every 500 hours of flight time.\n\n**Who it affects:**\n- Aircraft owners and operators with McCauley or Sensenich fixed-pitch metal propellers\n- Licensed aircraft maintenance engineers who work on these propellers\n- Flying schools, charter operators, and private pilots using affected aircraft\n\n**Why it matters:**\nPropeller mounting bolts are critical safety components. If they crack or loosen, the propeller could detach from the engine in flight — a potentially catastrophic failure. This directive prevents accidents by ensuring bolts are regularly inspected for hidden damage and kept properly tightened."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This instrument is labelled 'Amdt 1' to AD/PFP/9 and therefore represents an amendment. The amendment establishes two explicit maintenance obligations for the affected propellers: (1) magnetic particle inspection of propeller mounting bolts whenever the propeller is removed for reconditioning or repair, and (2) verification of propeller mounting bolt torque at intervals not exceeding 500 hours time in service (Applicability; Requirement 1 and 2). The text provided does not include the prior wording, but the amendment format and the specified requirements indicate an added or clarified set of obligations for the named propellers."},"complexity_factors":["Limited number of clear, discrete requirements (two duties: magnetic particle inspection on propeller removal; torque checks every ≤500 hours) (Requirement 1 and 2).","Technical specificity: mandates a particular non-destructive method (magnetic particle inspection) which requires specialised equipment and trained technicians (Requirement 1).","Operational scheduling implications: recurring interval obligation (≤500 hours TIS) creates ongoing compliance planning (Requirement 2).","Narrow applicability but high technical entry barrier: applies only to McCauley and Sensenich fixed-pitch metal propellers, concentrating effects on a defined operator cohort (Applicability).","Text does not specify alternative methods, torque values, record-keeping format, or exemptions, which leaves practical implementation details to operators and MROs and may require supplementary guidance (Requirement 1 and 2)."],"plain_english_summary":"This airworthiness directive covers McCauley and Sensenich fixed‑pitch metal propellers and requires magnetic‑particle inspection of propeller mounting bolts whenever a propeller is removed for reconditioning or repair, plus recurring torque checks on those bolts at intervals not exceeding 500 hours. It affects aircraft owners/operators and maintenance providers—adding one‑off inspection work, ongoing torque‑monitoring, and associated costs and downtime to detect bolt defects and reduce bolt‑related failure risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check","history":"/api/acts/ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check/history","analysis":"/api/acts/ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check/analysis","conflicts":"/api/acts/ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check/conflicts","importantCases":"/api/acts/ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check/important-cases","documents":"/api/acts/ad-pfp-9-amdt-1-propeller-mounting-bolts-inspection-and-torque-check/documents"}}