{"id":"F2006B11276","name":"AD/MiG 15/1 - Aircraft Maintenance Check","slug":"ad-mig-15-1-aircraft-maintenance-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57079,"registerId":"commonwealth-F2006B11276-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MiG 15/1 - Aircraft Maintenance Check","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)  \nMikoyan and Gurevich (MiG 15) Series Aeroplanes\n\nAD/MiG 15/1 Aircraft Maintenance Check 10/93 DM\n\nApplicability: All SB Lim-1, SB Lim-2 and MiG 15 series aeroplanes.\n\nRequirement: 1. If not already carried out, establish and record time in service for all time-lifed components and ensure compliance with approved life limits. Refer data approved pursuant to CAA letter \"Operation of MiG 15 Type aeroplanes and Derivatives\" dated 10 August 1993.\n\n    2. (a) Carry out an idle speed engine run.\n\n    (b) Remove the aircraft tail section and inspect as indicated below to ensure that there are no unsafe conditions present, with particular reference to flammable fluids and ignition sources.\n\nAircraft\n\n    (i) the rear fuel tank installation including the fuel transfer pump and associated plumbing.\n\n    (ii) the exhaust section heat blanket.\n\n    (iii) the tail pipe and jet nozzle.\n\n    (iv) all exposed flexible hoses.\n\n    (v) sealing of refuelling port surroundings and filler cap.\n\nEngine\n\n    (vi) the upper and lower fuel pumps including the lower pump solenoid valve (isolation valve)\n\n    (vii) the Barometric Pressure Control (BPC) including the vent gauze for obstruction\n\n    (viii) the jet (exhaust) pipe\n\n    (ix) measure the turbine blade tip clearance for minimum acceptable dimension and record the results\n\n    (c) Reinstall the aircraft tail section\n\n    (d) In accordance with data approved pursuant to CAA letter \"Operation of MiG 15 Type Aeroplanes and Derivatives\" dated 10 August 1993, mark cockpit EGT indicators with a \"red radial\" line at the maximum permissible temperature for take-off relevant to the rating for the installed engine and carry out a calibration check of the EGT indicating system, and the engine RPM indicating system.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n    3. Carry out an engine ground run and check for:\n\n    (a) correct set up for upper and lower engine fuel pumps,\n\n    (b) isolation valve operation, and\n\n    (c) correct maximum RPM setting.\n\n    4. Remove appropriate aircraft fuselage access panels and inspect the engine and rear fuel tank installation for condition and evidence of flammable fluid leakage. Reinstall access panels after inspection and any required rectification.\n\nCompliance: Requirements 1, 2 and 3\n\n    (a) before further flight for aircraft already issued with a \"Permit to Fly for Historical and Ex-Military Aircraft\", and\n\n    (b) before being issued with a \"Permit to Fly for Historical and Ex-Military Aircraft\" for other aircraft.\n\nRequirements 2 (a), (b), (c) and 3\n\nat intervals of 50 hours time in service Requirement 2 (b) (ix)\n\nbefore the first flight of the day Requirement 4\n\nat intervals of 10 hours in service\n\nBackground: All MiG 15 aircraft in Australia were grounded subsequent to the 13 March 1993 accident in Canberra pending the outcome of the accident investigation. The AD requirements cover areas of concern identified during the accident investigation. Compliance with this AD will form part of the basis for revoking the grounding action taken on the aircraft however compliance alone does not constitute airworthiness of the aircraft nor guarantees continued safe operation.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Before the AD, all MiG‑15 aircraft in Australia were grounded (Background). The AD replaces blanket grounding with a set of prescriptive inspections, tests and record checks that must be completed before a 'Permit to Fly for Historical and Ex‑Military Aircraft' is issued or before further flight, and at specified intervals. Compliance is necessary to lift the grounding but is explicitly not a standalone declaration of airworthiness (Background; Compliance)."},"complexity_factors":["Multiple technical tasks (structural removal, fuel-system, exhaust, turbine clearance measurements) increase maintenance skill and tooling needs (Requirement 2(b), 2(b)(ix)).","Staggered compliance timings: before further flight/permit issuance, daily (before first flight), 10‑hour and 50‑hour intervals impose differing record and scheduling burdens (Compliance section; Requirements 2(a),(b),(c),3,4).","Recordkeeping and verification obligation to establish time-in-service for life‑limited components and ensure approved life limits are met requires access to historical data and documentation (Requirement 1).","Dependence on external approved data (‘CAA letter “Operation of MiG 15 Type aeroplanes and Derivatives” dated 10 August 1993’) creates a regulatory coupling and possible ambiguity if that data is updated or inaccessible (Requirement 1; Requirement 2(d)).","Operational constraints: removal/reinstallation of tail section and fuselage panels, engine runs and calibrations cause aircraft downtime and potential facility restrictions (Requirement 2(b),(c); Requirement 4).","Enforcement and consequence link to permit status creates administrative discretion for the regulator and an operational incentive for owners to comply promptly (Compliance; Background)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of all SB Lim-1, SB Lim-2 and MiG‑15 series aeroplanes to record time-in-service for life‑limited parts, perform specified inspections of tail, fuel and exhaust systems, run idle and ground engine checks, mark and calibrate EGT/RPM indicators, and measure turbine blade clearances. Checks must be completed before issuing or flying under a “Permit to Fly for Historical and Ex‑Military Aircraft” and at stated intervals; the measure responds to an accident investigation and supports lifting the grounding but does not itself guarantee airworthiness."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive issued in response to a specific accident. It maintains narrow scope limited to MiG 15 series aircraft and the specific maintenance issues identified in the 1993 Canberra crash investigation. No evidence of scope creep beyond original aviation safety purpose."},"complexity_factors":["Single discrete subject matter (MiG 15 maintenance) with clear applicability","Only 4 main requirements with numbered sub-paragraphs (2a-ix, 3a-c, etc.)","Minimal defined terms – only refers to external documents (CAA letter dated 10 August 1993) for technical specifications","Straightforward conditional logic: 'If not already carried out' appears once; compliance deadlines are clearly bifurcated by aircraft status","No cross-references to other legislation beyond Civil Aviation Regulations 1998 Part 39","Background section provides clear context but doesn't create additional legal obligations","Physical document appears to be a scanned/faxed directive with simple formatting"],"plain_english_summary":"This CASA Airworthiness Directive for MiG‑15 and SB Lim‑1/2 aircraft in Australia requires operators to follow strict maintenance, life‑tracking, fuel‑system and engine monitoring checks and pre‑flight tests after a 1993 fatal crash. \n\nIt affects museums, private collectors and warbird pilots, lifting the grounding only under conditions designed to reduce fire and engine‑failure risks when flying 1950s Soviet military jets recreationally."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mig-15-1-aircraft-maintenance-check","history":"/api/acts/ad-mig-15-1-aircraft-maintenance-check/history","analysis":"/api/acts/ad-mig-15-1-aircraft-maintenance-check/analysis","conflicts":"/api/acts/ad-mig-15-1-aircraft-maintenance-check/conflicts","importantCases":"/api/acts/ad-mig-15-1-aircraft-maintenance-check/important-cases","documents":"/api/acts/ad-mig-15-1-aircraft-maintenance-check/documents"}}