{"id":"F2006B11369","name":"AD/MU-2/39 - Fitment of Manual Ignition Switches","slug":"ad-mu-2-39-fitment-of-manual-ignition-switches","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57268,"registerId":"commonwealth-F2006B11369-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/39 - Fitment of Manual Ignition Switches","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)  \nMitsubishi MU-2 Series Aeroplanes\n\nAD/MU-2/39 Fitment of Manual Ignition Switches 4/87\n\nApplicability: Models MU-2B \\-10, \\-15, \\-20, \\-25, \\-26, \\-26A, \\-30 \\-35, \\-36, \\-36A, \\-40 and \\-60.\n\nRequirement: Embody manual ignition switches in accordance with;\n\nFor Mitsubishi Heavy Industries Ltd aircraft - MHI SR 066B dated 13 November 1986, and For Mitsubishi Aircraft International Inc. aircraft \\- MAI SR 040/74-001 Revision A dated 11 December 1986.\n\nNote 1. FAA AD 86-26-02 Amdt 39-5498 refers.\n\nNote 2. An Australian Flight Manual amendment is required for all applicable aircraft fitted with manual ignition switches.\n\nCompliance: Unless already accomplished. Prior to operations after 30 June 1987.\n\nBackground: This Directive provides a continuous ignition selection capability to prevent engine flameouts when operating in, or departing from, an icing environment and to rapidly restore power subsequent to an ice induced flameout.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to the MU-2 model variants listed in the Applicability and requires those aircraft to be fitted with manual ignition switches per the specified manufacturer service documents, with a Flight Manual amendment where fitted. The text does not indicate any expansion or narrowing of scope beyond this stated requirement."},"complexity_factors":["Model-specific applicability limited to a defined list of MU-2 variants (Applicability)","Mandatory compliance by a hard deadline tied to continued operations (Compliance)","Dependence on external manufacturer service documents (MHI SR 066B and MAI SR 040/74-001 Revision A) for technical compliance (Requirement)","Administrative requirement to amend the Australian Flight Manual where switches are fitted (Note 2)","Cross-reference to a foreign regulator's AD (FAA AD) which may require coordination for international operators (Note 1)"],"plain_english_summary":"What this instrument does (mechanics)\n\n- Requires operators/owners of the listed Mitsubishi MU-2 aeroplane models to install manual ignition switches on their aircraft. The installation must follow the service instructions specified for the two manufacturer groups: MHI SR 066B (13 November 1986) for Mitsubishi Heavy Industries aircraft, or MAI SR 040/74-001 Revision A (11 December 1986) for Mitsubishi Aircraft International aircraft (Requirement).\n- Requires an Australian Flight Manual amendment for any applicable aircraft that are fitted with the manual ignition switches (Note 2).\n- Prevents operation of the affected aircraft after 30 June 1987 unless the installation has already been accomplished (Compliance).\n\nWhy the instrument says it is being done\n\n- The instrument states its purpose is to provide a continuous ignition selection capability to prevent engine flameouts during operation in, or departure from, icing conditions and to restore power rapidly following an ice-induced flameout (Background). The AD also cross-references an FAA airworthiness directive (Note 1).\n\nWho pays, who decides, and what changes in behaviour\n\n- Who pays: aircraft owners/operators must arrange and bear the cost of installing the manual ignition switches and of updating the Flight Manual (Requirement; Note 2).\n- Who decides: the Civil Aviation Safety Authority issues this directive and sets the installation specification by reference to the two manufacturer service instructions named in the Requirement.\n- Behaviour change: operators of the listed MU-2 models cannot lawfully continue operations after the stated date unless the installation (and the Flight Manual amendment, if applicable) has been completed; maintenance/installation work must be carried out in accordance with the referenced service instructions (Compliance; Requirement; Note 2).\n\nPractical trade-offs, compliance burdens and incentives\n\n- Compliance burden: installing the switches requires following the external service documents named in the Requirement and amending the Flight Manual if switches are fitted (Requirement; Note 2). This creates direct costs (parts, labour, aircraft downtime) and an administrative task (manual amendment).\n- Incentives and market effects: operators have a compliance incentive (they cannot operate past the deadline without compliance). Maintenance organisations, parts suppliers, and those authorised to amend Flight Manuals are the likely suppliers of the required work; demand for those services will increase for affected aircraft (Applicability; Requirement; Note 2).\n- Implementation risk and discretion: the AD prescribes specific service documents to be followed, which reduces administrative discretion about how to comply but makes execution dependent on the completeness and clarity of those external documents (Requirement).\n- Alignment with other regulators: the AD notes a related FAA directive (Note 1), indicating corresponding foreign regulatory action (Note 1).\n\nNet effect (mechanical summary)\n\n- Operators of the listed MU-2 models must install manual ignition switches per the specified manufacturer service instructions and amend the Flight Manual where required, before operating the aircraft after 30 June 1987. The stated technical objective is to provide continuous ignition selection capability to address engine flameouts associated with icing (Applicability; Requirement; Note 2; Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive remains tightly scoped to its original safety purpose: preventing ice-related engine flameouts in Mitsubishi MU-2 aircraft through manual ignition capability. No scope creep is evident."},"complexity_factors":["Single, unambiguous requirement (fit manual ignition switches)","Only 2 conditional branches (which service bulletin applies depends on manufacturer)","No defined terms section","No cross-references to other legislation (only non-binding notes referencing FAA AD and Flight Manual requirement)","Clear, fixed compliance deadline","Short document (under 200 words)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) for specific Mitsubishi MU-2 aircraft models. It requires owners and operators to install **manual ignition switches** on their planes.\n\n**What it does:**\n- Forces the installation of switches that let pilots manually turn on the engine ignition system whenever they want, rather than relying on automatic systems alone.\n\n**Why it matters:**\n- **Prevents engine flameouts** (sudden engine shutdowns) when flying in or leaving icy conditions\n- Allows pilots to **quickly restart power** if ice causes an engine to cut out\n- Ice buildup can disrupt airflow to engines; continuous ignition helps keep them running\n\n**Who must comply:**\n- Owners/operators of Mitsubishi MU-2B models: -10, -15, -20, -25, -26, -26A, -30, -35, -36, -36A, -40, and -60\n\n**What they must do:**\n- Install switches following specific manufacturer service bulletins (MHI SR 066B or MAI SR 040/74-001 Rev A)\n- Update the aircraft's Flight Manual\n- Complete by **30 June 1987** (unless already done)\n\n**Key point:** This is a **retrofit requirement** — existing aircraft had to be modified, not just new ones."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-39-fitment-of-manual-ignition-switches","history":"/api/acts/ad-mu-2-39-fitment-of-manual-ignition-switches/history","analysis":"/api/acts/ad-mu-2-39-fitment-of-manual-ignition-switches/analysis","conflicts":"/api/acts/ad-mu-2-39-fitment-of-manual-ignition-switches/conflicts","importantCases":"/api/acts/ad-mu-2-39-fitment-of-manual-ignition-switches/important-cases","documents":"/api/acts/ad-mu-2-39-fitment-of-manual-ignition-switches/documents"}}