{"id":"F2006B11358","name":"AD/MU-2/29 - Avionic Equipment Mounting Shelf - Modification","slug":"ad-mu-2-29-avionic-equipment-mounting-shelf-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57256,"registerId":"commonwealth-F2006B11358-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/29 - Avionic Equipment Mounting Shelf - Modification","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Mitsubishi MU-2 Series Aeroplanes\n\n \n\nAD/MU-2/29 Avionic Equipment Mounting Shelf - Modification 1/84\n\nApplicability: MU-2B-36A/-60 S/N 697SA, 699SA, 701SA, 706SA, 708SA, 709SA, 711SA, 713SA, 714SA, 719SA, 720SA, 721SA, 723SA, 725SA, 727SA, 729SA thru 736SA,\n\n738SA thru 747SA, 749SA thru 757SA, 759SA, 761SA, 763SA and 765SA.\n\n \n\nDocument: Mitsubishi S.B. 015/53-001 Rev. A.\n\n \n\nNote: FAA AD 80-04-01 Amendment 39-3686 refers.\n\n \n\nCompliance: Within 100 hours time in service after 31st January 1984.\n\n \n\nBackground: Modification of the equipment mounting shelf is required to assure a reliable attitude reference.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD applies to the listed Mitsubishi MU-2 serial-number aircraft and requires modification of the avionic equipment mounting shelf per the referenced Mitsubishi service bulletin within a specified 100‑hour time limit. The text indicates the scope is to mandate that specific technical modification for those aircraft; there is no indication in the source that the scope was altered from that original intent (Applicability; Document; Compliance; Background)."},"complexity_factors":["Narrow applicability: specific MU-2 serial numbers are listed (Applicability).","Single, focused technical action required (modification of mounting shelf) (Background).","Clear, short compliance window (100 hours TIS after 31/01/1984) which creates a scheduling constraint (Compliance).","External technical detail delegated to a single manufacturer service bulletin (Mitsubishi S.B. 015/53-001 Rev. A) which must be consulted for implementation (Document).","Cross-reference to an FAA AD for related regulatory context but no additional domestic procedural layers (Note)."],"plain_english_summary":"What the instrument changes, mechanically\n\n- Requires a physical modification to the avionic equipment mounting shelf on specified Mitsubishi MU-2B-36A/-60 aeroplanes. The modification is to be carried out in accordance with Mitsubishi Service Bulletin S.B. 015/53-001 Rev. A. (Document)\n- The rule applies only to the aircraft listed by serial number in the AD. (Applicability)\n- The modification must be completed within 100 hours time in service after 31 January 1984. (Compliance)\n\nOfficial stated purpose\n\n- The AD states the modification is required \"to assure a reliable attitude reference.\" (Background)\n\nWho decides and how it is done\n\n- The Civil Aviation Safety Authority issued the directive and points to the manufacturer's service bulletin for the required technical work. The AD also refers to an FAA airworthiness directive for related context. (Document; Note)\n- The specific technical steps are set out in Mitsubishi S.B. 015/53-001 Rev. A. The AD directs operators to follow that document. (Document)\n\nWho is affected and who pays\n\n- The burden falls on the owners/operators of the listed MU-2 serial-numbered aeroplanes to ensure the modification is done within the 100‑hour window. (Applicability; Compliance)\n- The AD itself does not allocate funding; therefore owners/operators will be the parties who must arrange and meet the costs of carrying out the modification (the AD sets the obligation and timing). (Applicability; Compliance)\n\nCompliance burden, timing and operational implications\n\n- The compliance deadline is operationally specific: the modification must occur within 100 hours time in service after 31 January 1984, which creates a scheduling requirement tied to aircraft utilisation. Operators must plan maintenance within that time window. (Compliance)\n- The AD does not specify who must perform the work (for example, manufacturer vs independent maintenance provider), nor does it list required parts or downtime; those details are expected to be handled through the referenced service bulletin. (Document)\n\nCosts, incentives and trade-offs (source‑grounded)\n\n- Benefit is concentrated: the stated safety improvement accrues to operators and their passengers by improving the reliability of an attitude reference system on the listed aircraft. (Background; Applicability)\n- Cost burden is likewise concentrated: the owners/operators of the listed serial-number aircraft bear the direct costs of complying with the modification and any associated aircraft downtime. (Applicability; Compliance)\n- The AD anchors the technical standard to the manufacturer’s service bulletin and references an FAA AD, so compliance requires following those external technical instructions rather than leaving method to operator discretion. This reduces technical discretion over how the modification is done while placing the practical work and cost on operators. (Document; Note)\n\nImplementation risk, substitution and unintended consequences (source‑grounded)\n\n- The AD does not describe downstream effects (parts availability, manpower, or longer-term operational impacts). Any such effects must be managed by operators following the Mitsubishi service bulletin. (Document)\n\nWhat the AD does not say\n\n- The AD does not specify who carries out the work, the cost amounts, or enforcement mechanisms beyond setting the compliance obligation and deadline. It does not enumerate secondary economic effects or detail alternatives to the modification. (Applicability; Compliance; Document)\n\nBottom line\n\n- If you operate one of the listed MU-2 serial-number aircraft, this AD requires you to have the avionic equipment mounting shelf modified per Mitsubishi S.B. 015/53-001 Rev. A within 100 hours TIS after 31 January 1984 to address attitude reference reliability. The AD sets the obligation and technical reference; owners/operators must arrange and pay for the work and schedule it within the prescribed time window. (Applicability; Document; Compliance; Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, original airworthiness directive with a narrow, specific safety purpose. It has not expanded beyond its original intent — it addresses one identified safety issue (attitude reference reliability) on specific aircraft models through a single mandated modification."},"complexity_factors":["Single, specific technical requirement (one modification)","Limited applicability (42 specific aircraft serial numbers listed)","No defined terms section or interpretation provisions","No nested exceptions or conditional logic","Single cross-reference to manufacturer document and FAA equivalent","Clear, fixed compliance deadline (100 hours time in service after specific date)","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1988.\n\n**What it does:**\nRequires owners and operators of specific Mitsubishi MU-2B-36A and MU-2B-60 aircraft to modify the avionic (electronic navigation and flight instrument) equipment mounting shelf. The modification ensures the attitude reference system — which tells pilots the aircraft's orientation relative to the horizon — works reliably.\n\n**Who it affects:**\n- Owners and operators of 42 specific Mitsubishi MU-2 aircraft (identified by serial numbers ranging from 697SA to 765SA)\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nA faulty attitude reference can give pilots incorrect information about whether the aircraft is level, climbing, or turning. This is critical for flight safety, especially in poor visibility. The directive mandates a fix based on a manufacturer service bulletin to prevent potential accidents caused by unreliable instrument readings.\n\n**Key requirements:**\n- **When:** Must be completed within 100 hours of flight time after 31 January 1984\n- **How:** Follow Mitsubishi Service Bulletin 015/53-001 Revision A\n- **Reference:** Aligns with US Federal Aviation Administration (FAA) AD 80-04-01"}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-29-avionic-equipment-mounting-shelf-modification","history":"/api/acts/ad-mu-2-29-avionic-equipment-mounting-shelf-modification/history","analysis":"/api/acts/ad-mu-2-29-avionic-equipment-mounting-shelf-modification/analysis","conflicts":"/api/acts/ad-mu-2-29-avionic-equipment-mounting-shelf-modification/conflicts","importantCases":"/api/acts/ad-mu-2-29-avionic-equipment-mounting-shelf-modification/important-cases","documents":"/api/acts/ad-mu-2-29-avionic-equipment-mounting-shelf-modification/documents"}}