{"id":"F2006B10854","name":"AD/INST/5 Amdt 1 - Fuel Contents Gauges - Tank Unit - Inspection and Modification","slug":"ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56350,"registerId":"commonwealth-F2006B10854-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/5 Amdt 1 - Fuel Contents Gauges - Tank Unit - Inspection and 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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Instruments and Automatic Pilots\n\n \n\nAD/INST/5\n\nAmdt 1\n\n\nFuel Contents Gauges - Tank Unit - Inspection and Modification\n\n\n12/67\n\n \n\nApplicability: Stewart Warner Tank Units Type 391 (Piper P/No. 550613) installed in the following Piper Aircraft: PA-28-140 S/Nos. 28-20551 to 28-20672; PA28-150, 160 and 180\n\nS/Nos. 28-1761 to 28-2183; PA38-235 with S/Nos. 28-10003 to 28-10600.\n\n \n\nDocument: Piper SB No. 223. Compliance: Before 28 December 1967.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a historical Airworthiness Directive from 1967 (as indicated by the '12/67' date and 1967 compliance deadline). It remains a narrow, targeted safety order addressing a specific defective part in specific aircraft. There is no evidence of scope creep; it has not expanded beyond its original purpose of mandating inspection/modification of Stewart Warner fuel gauges in mid-1960s Piper aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (equipment type and aircraft serial numbers)","Single compliance requirement with fixed deadline","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or alternative compliance methods","Simple structure: identification, applicability, document reference, compliance date"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Piper aircraft to inspect and modify their fuel gauges.\n\n**What it does:**\n- Targets **Stewart Warner fuel tank gauges** (model 391, part number 550613) installed in certain Piper Cherokee aircraft built in the mid-1960s.\n- Requires these fuel gauges to be inspected and modified according to **Piper Service Bulletin No. 223** — a technical instruction from the manufacturer.\n- Sets a **hard deadline**: the work must be done before 28 December 1967.\n\n**Who it affects:**\n- Owners and operators of specific Piper aircraft models (PA-28-140, PA-28-150, PA-28-160, PA-28-180, and PA-28-235) with specific serial numbers manufactured between roughly 1965 and 1967.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety notices. If you don't comply, your aircraft cannot legally fly. This particular AD addresses potential defects in fuel quantity indication systems — critical for knowing how much fuel you have left in flight. Faulty fuel gauges have caused accidents when pilots unexpectedly ran out of fuel."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based only on the supplied text, the directive's scope aligns with its explicit statements: it applies to Stewart Warner Tank Units Type 391 (Piper P/No. 550613) installed in the listed Piper aircraft serial number ranges and requires compliance with Piper SB No. 223 before 28 December 1967. There is no information in the supplied instrument indicating that the scope has been altered from its original stated applicability or requirements."},"complexity_factors":["Narrow, specific applicability by component type and aircraft serial number ranges (Applicability).","Mandatory reference to an external technical document (Piper SB No. 223) for procedural details (Document).","Fixed compliance deadline creates scheduling pressure (Compliance: Before 28 December 1967).","Technical work (inspection/modification) likely requires certified maintenance capability and parts, creating operational and supply dependencies (implied by Document).","Regulatory enforcement is implicit via placement in the Schedule of Airworthiness Directives, but the directive text provides no alternative compliance paths or exemptions (header; Document)."],"plain_english_summary":"This directive requires inspection and, if necessary, modification of Stewart Warner Tank Units Type 391 (Piper P/No. 550613) installed in specified Piper aircraft, performed in accordance with Piper Service Bulletin No. 223.  \n\nIt affects owners/operators and maintenance organisations of the listed aircraft; work must be completed before 28 December 1967, with costs and scheduling borne by the owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification","history":"/api/acts/ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification/history","analysis":"/api/acts/ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification/analysis","conflicts":"/api/acts/ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification/important-cases","documents":"/api/acts/ad-inst-5-amdt-1-fuel-contents-gauges-tank-unit-inspection-and-modification/documents"}}