{"id":"F2005L00073","name":"AD/G2T1/1 - Induction System Inspection","slug":"ad-g2t1-1-induction-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":33421,"registerId":"commonwealth-F2005L00073-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Great Lakes Aircraft Company, LLC Model ","sectionType":"division","heading":"Great Lakes Aircraft Company, LLC Model 2T-1A-1 and 2T-1A-2 Aeroplanes","content":"### Great Lakes Aircraft Company, LLC Model 2T-1A-1 and 2T-1A-2 Aeroplanes\n\n| AD/G2T1/1 | Induction System Inspection | 2/2005 |\n| --------- | --------------------------- | ------ |\n\n| Applicability: | Model 2T-1A-1 and 2T-1A-2 aeroplanes that have a Lycoming IO-360-B1F6, AIO-360-B1G6, or AEIO-360-B1G6 engine installed.                                                                                                                                                |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Visually inspect the aircraft induction system drain fitting located in the induction elbow below the fuel injector for blockage or restriction.                                                                                                                    |\n|                | 2. If the hole is found to be blocked or restricted in the weld area or not drilled through the elbow, as a result of the Requirement 1 inspection, open up the restricted hole or drill a hole in the elbow at the fitting location using a No.10 (0.193 inch) drill. |\n|                | 3. Visually inspect the alternate air door for distortion, heat damage and cracks.                                                                                                                                                                                     |\n|                | 4. If any damage is found as a result of the Requirement 3 inspection, repair or fabricate a new door in accordance with Figure 1, Figure 2 and Figure 3 in this Directive.                                                                                            |\n|                | 5. Visually inspect the aircraft induction system for cleanliness of the air filter, distortion, security and damage from backfire or induction system fire.                                                                                                           |\n|                | 6. If the air filter is dirty, if any distortion, damage or lack of security is found as a result of the Requirement 5 inspection, repair, replace or modify all affected components.                                                                                  |\n|                | Note: FAA AD 2004-25-22 Amdt 39-13910 refers.                                                                                                                                                                                                                          |\n| Compliance:    | For Requirement 1 - Within 25 hours time in service (TIS) after the effective date of this Directive.                                                                                                                                                                  |\n|                | For Requirement 2 - Before further flight, after the Requirement 1 inspection.                                                                                                                                                                                         |\n|                | For Requirement 3 - Within 25 hours TIS after the effective date of this Directive at thereafter at intervals not to exceed 100 hours TIS.                                                                                                                             |\n|                | For Requirement 4 - Before further flight, after the Requirement 3 inspection.                                                                                                                                                                                         |\n|                | For Requirement 5 - Within 25 hours TIS after the effective date of this Directive at thereafter at intervals not to exceed 100 hours TIS.                                                                                                                             |\n\n|             | For Requirement 6 - Before further flight, after the Requirement 5 inspection.                                                                                                                                                                                                                                                                                                                                                                                |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | This Airworthiness Directive becomes effective on 17 February 2005.                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background: | This Directive is issued following advice from the FAA regarding reports of heat distortion, damage and cracks found in the aircraft induction system on Lycoming IO-360-B1F6, AIO- 360-B1G6 and AEIO-360-B1G6 engines. The actions specified in this Directive are intended to prevent the aircraft induction system from becoming blocked or restricted, which could result in engine failure. This failure could lead to loss of control of the aeroplane. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n6 January 2005\n\n  \n![](image.002.png)\n\n![](image.003.png)\n\n![](image.004.png)","sortOrder":0},{"sectionNumber":"AD/G2T1/1","sectionType":"part","heading":"AD/G2T1/1","content":"## AD/G2T1/1","sortOrder":1},{"sectionNumber":"Induction System Inspection","sectionType":"part","heading":"Induction System Inspection","content":"## Induction System Inspection","sortOrder":2},{"sectionNumber":"2/2005","sectionType":"part","heading":"2/2005","content":"## 2/2005","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with tightly scoped applicability. It addresses a specific safety defect in specific aircraft with specific engines, exactly as intended for ADs. No scope creep detected."},"complexity_factors":["Straightforward sequential requirements (numbered 1-6) with clear conditional logic ('if X found, do Y')","Only 3 defined technical terms (TIS = 'time in service', specific engine models, aircraft models)","Simple compliance structure with two clear deadlines: 25 hours TIS for initial inspections, 100 hours TIS for recurring","No cross-references to other legislation beyond a single note referencing the originating FAA AD","Limited scope — applies only to specific aircraft model with specific engines","Visual diagrams referenced but not reproduced in text (Figures 1-3)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's aviation regulator (CASA) that requires specific aircraft owners to perform inspections and repairs.\n\n**What it does:**\nThis directive orders owners of specific Great Lakes biplanes (Models 2T-1A-1 and 2T-1A-2) with certain Lycoming engines to inspect and potentially fix their **induction systems** — the parts that bring air into the engine for combustion.\n\n**Who it affects:**\n- Owners/operators of Great Lakes 2T-1A-1 and 2T-1A-2 aircraft\n- Only those with Lycoming IO-360-B1F6, AIO-360-B1G6, or AEIO-360-B1G6 engines\n\n**What must be done:**\n- **Inspect** the drain fitting in the induction elbow (a pipe joint) for blockages — must be done within 25 flight hours of the directive taking effect\n- **Fix any blockages immediately** before flying again\n- **Inspect** the alternate air door (a backup air intake) for heat damage or cracks — initially within 25 flight hours, then every 100 flight hours\n- **Repair or replace** damaged doors immediately\n- **Inspect** the air filter and entire induction system for dirt, damage, or loose parts — initially within 25 flight hours, then every 100 flight hours\n- **Clean, repair or replace** any affected parts immediately\n\n**Why it matters:**\nThe FAA (American regulator) reported cases where heat damage and cracks in these systems caused blockages. A blocked induction system can cause **engine failure**, which could lead to **loss of control** and a crash. This directive prevents that by catching problems early.\n\n**Key deadlines:**\n- Initial inspections: Within 25 hours of flying time after 17 February 2005\n- Repeat inspections: Every 100 flight hours thereafter\n- Any repairs found necessary: Must be done **before the next flight**"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD stays within its original safety-focused purpose: to detect and remove blockages and to detect and repair heat/distortion damage in the induction system for the specified Great Lakes models and Lycoming engines. It mirrors the FAA advisory material referenced and does not add requirements beyond inspections, drilling a specified hole if blocked, recurring checks, and repair/replacement actions using the figures provided. There is no indication in this text that the Directive substantially broadened its scope beyond preventing induction blockage and related damage."},"complexity_factors":["Single-page AD with a limited applicability (two aircraft models with three specific engine types)","Six discrete, procedural requirements (inspections and corrective actions)","Initial compliance windows (25 hours TIS) and a single recurring interval (100 hours TIS) creating straightforward timing rules","One precise machining instruction (No.10 / 0.193 inch drill) for a mandatory corrective action","References to external material (FAA AD 2004-25-22 and Figures 1–3) but no extensive cross-references to other domestic legislation","No large interpretation/definitions section or nested exceptions; corrective actions must be completed before further flight where defects are found"],"plain_english_summary":"This AD requires owners/operators of Great Lakes 2T-1A-1 and 2T-1A-2 aeroplanes with specified Lycoming IO/AEO-360 engines to inspect and, where necessary, repair the induction (air intake) system — including drain fittings, alternate air door and filter/duct condition — to remove blockages, fix heat/distortion damage, and restore proper drainage/security.\n\nIt matters because blockage or induction-system damage can cause engine failure; compliance (inspections, repairs, occasional drilling/fabrication) is mandatory and borne by aircraft owners/operators and maintenance organisations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g2t1-1-induction-system-inspection","history":"/api/acts/ad-g2t1-1-induction-system-inspection/history","analysis":"/api/acts/ad-g2t1-1-induction-system-inspection/analysis","conflicts":"/api/acts/ad-g2t1-1-induction-system-inspection/conflicts","importantCases":"/api/acts/ad-g2t1-1-induction-system-inspection/important-cases","documents":"/api/acts/ad-g2t1-1-induction-system-inspection/documents"}}