{"id":"F2006B06181","name":"AD/PFP/7 Amdt 3 - Sensenich Propellers Operating Limitation","slug":"ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47033,"registerId":"commonwealth-F2006B06181-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PFP/7 Amdt 3 - Sensenich Propellers Operating Limitation","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/7\n\nAmdt 3\n\n  \nSensenich Propellers Operating Limitation 9/96\n\nApplicability: All Sensenich model M76EMM, M76EMMS, 76EM8 and 76EM8S( ) series propellers installed on Lycoming 0-360 series engines except propellers installed on 0-360-A4A, \\-A4D, \\-A4G, \\-A4J, \\-A4K, \\-A4M, \\-A4N, \\-A4P and \\-A5AD or additional\n\nengines identified by suffixes having a digit \"4\" or higher in the second position which are exempt from the requirements of this Directive.\n\nThese propellers are installed on but not limited to the following aircraft. Piper PA- 28-180, PA-28-181, American General Aircraft Holding Co. Inc (formerly Gulfstream American) AA-5 series, Beech B23 and C23, Cessna 172Q, Avions Pierre Robin R-3000/160 and aircraft modified by various STC’s.\n\nRequirement: 1. Avoid continuous engine operation between 2150 and 2350 RPM.\n\n2. Unless previously carried out, either manufacture and install a placard in the aircraft adjacent to the engine RPM tachometer with the following words in letters at least 3.0 mm high. \" AVOID CONTINUOUS OPERATION BETWEEN 2150 AND 2350 RPM.\" or, mark the engine RPM tachometer in the aircraft with a red arc from 2150 RPM to 2350 RPM.\n\nNote 1: FAA AD 69-09-03 R3 Amdt 39-9583 refers in part. Note 2: AD/PFP/8 refers to the ‘K’ modification standard.\n\nCompliance: For Requirement 1. On receipt of this directive with an effective date of 15 August 1996.\n\nFor Requirement 2. Unless previously carried out within 25 hours TIS from 15 August 1996.\n\nBackground: The manufacturer has advised that continuous operation between specific engine RPM may result in a propeller blade fatigue failure. This AD amendment includes additional propeller/engine combinations that are exempt from the AD requirements.\n\nThe original issue of this Airworthiness Directive became effective on 16 May 1969\\. Amendment 1 of this Airworthiness Directive became effective on 7 August 1969.\n\nAmendment 2 of this Airworthiness Directive became effective on 30 September 1978.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment adds additional propeller/engine combinations that are exempt from the Directive while keeping the original RPM avoidance and placarding requirements and their effective/compliance dates."},"complexity_factors":["Dual requirement: immediate operational prohibition plus a placarding/tachometer marking obligation with a separate 25‑hour TIS compliance window.","Detailed applicability: multiple Sensenich propeller models (M76EMM, M76EMMS, 76EM8, 76EM8S) tied to Lycoming O‑360 engine variants with specific engine-model exceptions.","Exemption rule uses engine suffix conventions (digit '4' or higher in second position), requiring careful identification of engine serial/model codes.","Cross-references to FAA AD 69-09-03 R3 and another CASA AD (AD/PFP/8) require checking external documents for full context.","Affects a wide range of aircraft makes/models and STC-modified aircraft, increasing operator identification and compliance workload."],"plain_english_summary":"This Airworthiness Directive prohibits continuous engine operation between 2150 and 2350 RPM for specified Sensenich M76/M76EM series fixed‑pitch propellers on Lycoming O‑360‑series engines (with stated engine-model exceptions), and requires a placard or a red arc on the tachometer. The manufacturer advises continuous operation in that RPM band may cause propeller blade fatigue failure. It applies to owners/operators of the listed propellers/aircraft; the RPM restriction is effective on receipt and placarding must be completed within 25 hours TIS."},"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":true,"description":"The original 1969 directive covered a narrower set of propeller/engine combinations. Amendment 3 (1996) has expanded the scope by adding exemptions — specifically excluding engines with suffix digits '4' or higher in the second position. This represents a technical refinement where the safety authority has determined certain configurations are not at risk, reducing the regulatory burden for those specific combinations while maintaining the core operating limitation for the remainder."},"complexity_factors":["Single substantive requirement with two implementation options (placard OR red arc marking)","Clear applicability section with specific model numbers and explicit exemptions","Simple conditional logic: 'all X except Y' structure","Minimal cross-referencing (only two non-binding notes referencing related FAA AD and another CASA AD)","No nested definitions or interpretation sections","Straightforward compliance timeline (immediate for operational limitation, 25 hours TIS for physical marking)","Document is short (approximately 300 words) and self-contained"],"plain_english_summary":"This CASA Airworthiness Directive mandates safety action for certain Sensenich fixed‑pitch propellers on Lycoming O‑360‑equipped light aircraft after discovery that sustained operation at 2,150–2,350 RPM can cause blade fatigue and in‑flight failure. Affected operators must avoid continuous operation in that RPM band and add a visible warning or red‑arc to the tachometer within the compliance window.\n\nIt’s a life‑critical rule; some O‑360 variants with specific suffixes are exempt based on new data."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation","history":"/api/acts/ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation/history","analysis":"/api/acts/ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation/analysis","conflicts":"/api/acts/ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation/conflicts","importantCases":"/api/acts/ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation/important-cases","documents":"/api/acts/ad-pfp-7-amdt-3-sensenich-propellers-operating-limitation/documents"}}