{"id":"F2006B06032","name":"AD/PA-46/26 - Engine Operating Limitations","slug":"ad-pa-46-26-engine-operating-limitations","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114430,"registerId":"commonwealth-F2006B06032-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-46/26 - Engine Operating Limitations","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-46 (Malibu) Series Aeroplanes\n\nAD/PA-46/26 Engine Operating Limitations 4/96\n\nApplicability: PA46-350P Malibu Mirage aircraft serial numbers 4622001 through 4622189.\n\nRequirement: 1. Install an engine operating limitation placard on the pilot's side instrument panel in accordance with the procedure detailed in Piper Service Bulletin No. 982, Instructions 1, 2 and 3.\n\n2. A Flight Manual amendment, reflecting the requirements of Piper Service Bulletin No. 982, Instruction 4, is required and is available to Certificate of Registration holders on request to the Authority.\n\nNote: FAA Airworthiness Directive 95-23-12 refers.\n\nCompliance: Prior to 30 April 1996.\n\nBackground: This Directive has been issued to require an amendment to engine operating procedures. The requirement has been issued to prevent fatigue damage to the propeller caused by operating the engine above certain manifold pressure limits.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive does not expand or narrow its subject beyond the stated measures. It requires a placard and a Flight Manual amendment for the specific PA46-350P serial numbers listed (Applicability; Requirement 1; Requirement 2) to limit manifold pressure and address propeller fatigue (Background). No text in the instrument indicates a change from that stated purpose or a broader scope."},"complexity_factors":["Very narrow applicability limited to PA46-350P serial numbers 4622001–4622189 (Applicability).","Two discrete, straightforward requirements: install a placard and amend the Flight Manual (Requirement 1; Requirement 2).","Compliance tied to an external technical document (Piper Service Bulletin No. 982) which prescribes the exact procedure (Requirement 1).","Fixed compliance deadline (Prior to 30 April 1996) creates a time-bound obligation (Compliance).","Administrative detail: Flight Manual amendment is provided by the Authority on request rather than automatically (Requirement 2), creating a minor procedural step.","Technical safety rationale (propeller fatigue related to manifold pressure) underpins the rule but does not add legal complexity to the directive text (Background).","Reference to an FAA Airworthiness Directive adds cross-jurisdictional context but does not change obligations in this text (Note)."],"plain_english_summary":"Applies to Piper PA-46-350P Malibu Mirage aircraft, serials 4622001–4622189: owners must, by 30 April 1996, fit an engine‑operating‑limitation placard on the pilot’s panel (per Piper SB No. 982) and amend the Flight Manual (amendment available from the Civil Aviation Safety Authority). The measures—paid for by the certificate holder—impose documented manifold‑pressure limits to reduce propeller fatigue by restricting certain engine operating practices."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical issue (propeller fatigue) in a specific aircraft model. It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (under 200 words)","Only 2 substantive requirements, both referencing a single external document (Piper Service Bulletin No. 982)","No defined terms section — uses plain aviation terminology","Simple applicability test (specific serial number range)","Single compliance deadline with no conditional extensions or exceptions","No cross-references to other legislation beyond the enabling regulations (CAR 1998 Part 39) and the FAA AD note"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a recall notice for aircraft, but legally binding.\n\n**What it does:** It requires owners of specific Piper PA-46 Malibu Mirage aeroplanes (serial numbers 4622001 through 4622189) to:\n- **Install a warning placard** on the pilot's instrument panel showing new engine operating limits\n- **Update the aircraft's Flight Manual** to reflect these new limits (available free from CASA on request)\n\n**Why it matters:** Operating the engine above certain manifold pressure limits was causing **fatigue damage to the propeller** — essentially, the propeller was wearing out prematurely and could potentially fail. This directive prevents that by clearly warning pilots not to exceed safe power settings.\n\n**Who must comply:** Anyone who owns or operates the affected Piper Malibu Mirage aircraft (specific serial numbers listed). The work had to be done before 30 April 1996.\n\n**Key point:** This is a reactive safety measure based on a US Federal Aviation Administration (FAA) directive (95-23-12), showing how Australia harmonises its aviation safety rules with international standards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-46-26-engine-operating-limitations","history":"/api/acts/ad-pa-46-26-engine-operating-limitations/history","analysis":"/api/acts/ad-pa-46-26-engine-operating-limitations/analysis","conflicts":"/api/acts/ad-pa-46-26-engine-operating-limitations/conflicts","importantCases":"/api/acts/ad-pa-46-26-engine-operating-limitations/important-cases","documents":"/api/acts/ad-pa-46-26-engine-operating-limitations/documents"}}