{"id":"F2006B08132","name":"AD/CESSNA 303/5 Amdt 1 - Turbocharger and Exhaust Mount","slug":"ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115268,"registerId":"commonwealth-F2006B08132-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 303/5 Amdt 1 - Turbocharger and Exhaust Mount","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)  \nCessna T303 Series Aeroplanes\n\nAD/CESSNA 303/5\n\nAmdt 1\n\n  \nTurbocharger and Exhaust Mount 4/87\n\nApplicability: Cessna model T303/Crusader, 1982 through 1984 with serial numbers T30300001 through T30300315.\n\nRequirement: Action in accordance with Cessna Service Bulletin MEB86-19 Rev 1.\n\nNote: S.B. MEB86-20 has also been issued and is recommended by the manufacturer to be accomplished concurrently when complying with S.B. MEB86-19.\n\nCompliance: Unless already accomplished, prior to the issue of the next Maintenance Release after 31 May 1987.\n\nBackground: The manufacturer has recognised a problem with the turbocharger and exhaust system mounting, and is supplying a modification kit to improve the service life. This amendment is raised to incorporate Revision 1 of the Requirement Document which changes nearly all areas of the original issue and to alter the compliance time.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The instrument explicitly states it is an amendment that incorporates Revision 1 of the Requirement Document, and that Revision 1 'changes nearly all areas of the original issue and ... alter[s] the compliance time.' That indicates the scope and timing of the original directive were changed by this amendment (Background)."},"complexity_factors":["Narrow applicability limited to specific model years and serial number range (Applicability).","Mandatory reliance on an external technical document (Cessna Service Bulletin MEB86-19 Rev 1) to define the required work (Requirement).","Amendment incorporates a Revision 1 that 'changes nearly all areas' of the original issue and alters the compliance time, introducing potential uncertainty about differences between versions (Background).","Fixed compliance deadline tied to the next Maintenance Release after 31 May 1987 (Compliance).","Recommended (but non-mandatory) concurrent service bulletin (MEB86-20) that may expand scope if followed (Note).","Manufacturer supplies a modification kit, but the instrument does not specify cost allocation or payment terms (Background)."],"plain_english_summary":"What this instrument does\n\n- It requires a specific modification to the turbocharger and exhaust mount on certain Cessna T303/Crusader aeroplanes. (Applicability; Requirement)\n\nWho it affects\n\n- Owners/operators of Cessna T303/Crusader aeroplanes built 1982–1984 with serial numbers T30300001 through T30300315. (Applicability)\n\nWhat must be done, mechanically\n\n- The affected aircraft must be modified in accordance with Cessna Service Bulletin MEB86-19 Rev 1. (Requirement)\n- The manufacturer has issued a modification kit to address the turbocharger and exhaust mounting. (Background)\n- The manufacturer also recommends accomplishing Service Bulletin MEB86-20 at the same time, but that second bulletin is presented as a recommendation rather than a mandatory requirement in this instrument. (Note)\n\nWhen it must be done\n\n- Unless already done, the required modification must be completed before the next Maintenance Release issued after 31 May 1987. (Compliance)\n\nWhy it was issued (stated purpose)\n\n- The stated reason is that the manufacturer recognised a problem with the turbocharger and exhaust system mounting and is supplying a kit to improve service life. This amendment incorporates Revision 1 of the Requirement Document, which the background says changes nearly all areas of the original issue and alters the compliance time. (Background)\n\nHow this changes behaviour, incentives and practical costs\n\n- Obligation and decision: The instrument creates an obligation that falls on those responsible for the listed aircraft to ensure the modification described in the service bulletin is completed by the specified compliance moment. The instrument identifies the required technical document to follow (Cessna Service Bulletin MEB86-19 Rev 1). (Requirement; Compliance)\n- Supply and procurement: The manufacturer is supplying a modification kit for this work, but the instrument does not specify payment terms or who bears the cost of parts or labour. (Background)\n- Compliance burden: Operators must obtain and apply the referenced service bulletin and, unless already done, schedule the modification before the stated Maintenance Release deadline. The instrument also signals an additional recommended task (MEB86-20) that may increase the scope of work if followed. (Requirement; Note; Compliance)\n- Implementation risk and administrative change: The amendment incorporates Revision 1, which the background says changes nearly all areas of the original requirement and alters the compliance time; that revision may require operators and maintenance organisations to review and, if necessary, redo or adjust earlier work that followed the original issue. (Background)\n\nLimited scope and direct effects\n\n- The directive applies to a narrowly defined set of serial numbers and model years. Its measurable effects are: (1) a technical change must be made in line with the named service bulletin, and (2) the work must be completed by the named compliance milestone. The instrument does not set out cost recovery, subsidies, or enforcement penalties in the text provided. (Applicability; Requirement; Compliance)\n\nTrade-offs and opportunity costs (source-grounded)\n\n- The source states the objective (improving service life of turbocharger/exhaust mount) and supplies a technical route (service bulletin and kit). It does not quantify costs, time in maintenance, or effects on aircraft availability. Operators therefore face a choice between scheduling the modification (and absorbing whatever parts/labour and downtime are required) or having non-compliant aircraft past the compliance date. (Background; Requirement; Compliance)\n\nPractical note on reading the instrument\n\n- This instrument is an airworthiness directive that points to an external technical document (Cessna Service Bulletin MEB86-19 Rev 1) as the required method of compliance; readers must consult that service bulletin for the technical steps, parts lists and labour instructions referenced here. (Requirement)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: mandating a specific safety modification for a defined aircraft type. The amendment updates the technical reference document and compliance timing, but does not expand the scope beyond the turbocharger/exhaust mount issue for the specified Cessna models."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (specific aircraft serial numbers)","Single requirement referencing an external technical document (Cessna Service Bulletin)","Simple compliance deadline structure (single date trigger)","No nested exceptions or conditional logic","No cross-references to other legislation beyond the enabling regulations (Civil Aviation Regulations 1998, Part 39)"],"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 as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific Cessna T303 Crusader aeroplanes (built 1982–1984, serial numbers T30300001 through T30300315) to carry out a specific safety modification to the turbocharger and exhaust mounting system.\n\n**Who must act:** Anyone who owns, operates, or maintains one of these specific Cessna aircraft.\n\n**What action is required:** They must follow the instructions in **Cessna Service Bulletin MEB86-19 Revision 1** — a technical document from the manufacturer describing the fix. The manufacturer also recommends doing a related bulletin (MEB86-20) at the same time, though this isn't mandatory.\n\n**When it had to be done:** Before the aircraft's next **Maintenance Release** (a formal certificate showing an aircraft is safe to fly) issued after 31 May 1987. If already done, no further action needed.\n\n**Why it matters:** The manufacturer identified that the turbocharger and exhaust mounting system had a design problem that could affect safety and service life. This AD ensures all affected Australian aircraft were modified to prevent potential failures.\n\n**Key change in this version:** This amendment updates the original directive to use a revised technical document (Revision 1 of the service bulletin, which changed almost everything from the original) and adjusts the compliance deadline."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount","history":"/api/acts/ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount/history","analysis":"/api/acts/ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount/analysis","conflicts":"/api/acts/ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount/conflicts","importantCases":"/api/acts/ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount/important-cases","documents":"/api/acts/ad-cessna-303-5-amdt-1-turbocharger-and-exhaust-mount/documents"}}