{"id":"F2006B11366","name":"AD/MU-2/36 Amdt 1 - Pitot System","slug":"ad-mu-2-36-amdt-1-pitot-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57265,"registerId":"commonwealth-F2006B11366-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/36 Amdt 1 - Pitot System","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-2/36\n\nAmdt 1\n\n\nPitot System 8/86\n\n \n\nApplicability: All models MU-2B, Serial Numbers 001 up to and including 753, with or without the SA suffix.\n\n \n\nDocument: 1. Mitsubishi Aircraft International Ltd. Service Recommendation No 020/34-005 Rev B; or\n\n \n\n2. Mitsubishi Heavy Industries Ltd Service Recommendation No. 053A.\n\n \n\nNote: FAA AD 85-04-03 refers.\n\n \n\nCompliance: Prior to 31 August 1986.\n\n \n\nBackground: 1. Pilot reports indicate that erroneous airspeed indications have been noted during flight in icing conditions. The erroneous airspeed indication was caused by accumulation of ice in the pitot tube mast.\n\n \n\n2. This Directive has been amended to increase the serial number applicability.\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":true,"description":"This is Amendment 1 to the original AD/MU-2/36. The amendment explicitly expanded the scope by increasing the serial number applicability range to cover more aircraft than the original directive. The background section confirms this was a deliberate expansion of coverage rather than a clarification."},"complexity_factors":["Very short document (approximately 250 words)","Only 2 defined applicability criteria (model and serial number range)","Simple binary compliance path (follow either of 2 specified documents)","Single deadline with no conditional extensions or exceptions","No cross-references to other legislation beyond a single note referencing an FAA AD","No nested definitions or interpretive provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nIt requires owners and operators of specific Mitsubishi MU-2B aeroplanes to take action to fix a dangerous icing problem in the **pitot system** (the equipment that measures airspeed). Ice building up in the pitot tube mast was causing false airspeed readings during flight in icy conditions — a serious safety risk.\n\n**Who it affects:**\n- All Mitsubishi MU-2B aircraft with serial numbers 001 through 753 (including those with \"SA\" suffix)\n- Aircraft operators, maintenance organisations, and owners of these planes\n\n**What must be done:**\nOperators must follow one of two specific service bulletins issued by Mitsubishi (Service Recommendation No 020/34-005 Rev B, or Service Recommendation No. 053A) to correct the defect.\n\n**When:**\nThe fix had to be completed before 31 August 1986.\n\n**Why it matters:**\nErroneous airspeed indications in icing conditions can lead to pilots making dangerous decisions — such as stalling the aircraft or flying too fast. This directive was issued after pilots reported the problem, and was later expanded (Amendment 1) to cover more aircraft serial numbers than originally specified."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Background paragraph 2 expressly states the Directive was amended to increase the serial number applicability. That amendment expands the set of MU-2B operators required to carry out the pitot‑system work and therefore increases the aggregate compliance obligations and costs borne by aircraft owners/operators (Background 2; Applicability)."},"complexity_factors":["Narrow technical scope: applies only to MU-2B models, Serial Numbers 001–753 (Applicability) — reduces legal complexity but concentrates effect on a defined operator group.","Hard compliance deadline: specifies a fixed completion date (Prior to 31 August 1986) (Compliance) — creates a time‑bound administrative burden for operators.","External norm reference: requires following one of two external Mitsubishi service recommendations (Document) — implementation depends on accessing and following those documents, increasing procedural dependency.","Safety rationale tied to empirical reports: cites pilot reports of erroneous airspeed from pitot mast icing (Background 1) — establishes a technical trigger for the directive rather than a broad regulatory standard.","Amendment alters scope: notes an amendment to increase serial number applicability (Background 2) — changes who must comply and therefore the universe of affected payers and service workload.","Enforcement and cost allocation implicit: the AD requires operators to act but does not specify funding or subsidy (Applicability; Document; Compliance) — implies owners/operators bear the compliance cost and scheduling burden."],"plain_english_summary":"Mandates that operators of Mitsubishi MU-2B aeroplanes (serial numbers 001–753) must carry out the pitot‑system work specified in one of two Mitsubishi service recommendations to prevent erroneous airspeed indications caused by ice in the pitot tube mast. Compliance was required by 31 August 1986. It affects aircraft owners and operators who must arrange and pay for the inspection, modification or maintenance set out in the referenced service documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-36-amdt-1-pitot-system","history":"/api/acts/ad-mu-2-36-amdt-1-pitot-system/history","analysis":"/api/acts/ad-mu-2-36-amdt-1-pitot-system/analysis","conflicts":"/api/acts/ad-mu-2-36-amdt-1-pitot-system/conflicts","importantCases":"/api/acts/ad-mu-2-36-amdt-1-pitot-system/important-cases","documents":"/api/acts/ad-mu-2-36-amdt-1-pitot-system/documents"}}