{"id":"F2006B05633","name":"AD/PA-28/78 - Fuel Tank Vent and Vent Hose - Modification and Replacement","slug":"ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135290,"registerId":"commonwealth-F2006B05633-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AD/PA-28/78 Fuel Tank Vent and Vent","sectionType":"part","heading":"AD/PA-28/78 Fuel Tank Vent and Vent","content":"# AD/PA-28/78 Fuel Tank Vent and Vent\n\nHose \\- Modification and Replacement\n\nApplicability: Model PA-28-161 with S/Nos. 28-7816024 to 28-7916475. Model PA-28-181 with S/Nos. 28-7890023 to 28-7990493. Model PA-28-201T with S/Nos. 28-7921001 to 28-7921068. Model PA-28-201 with S/Nos. 28R-7737135 to 28R-7837317. Model PA28RT-201 with S/Nos. 28R-7918001 to 28R-7918172. Model PA28R-201T with S/Nos. 28R-7703309 to 28R-7803373.\n\nModel PA28RT-201T with S/Nos. 28R-7931001 to 28R-7931222. Model PA-28-235 with S/Nos. 28-7710079 to 28-7710089.\n\nModel PA-28-236 with S/Nos. 28-7911001 to 28-7911204.\n\nDocument: Piper SB No. 646.\n\nCompliance: Within 100 hours time in service after 30 November 1979.","sortOrder":0},{"sectionNumber":"11/79","sectionType":"part","heading":"11/79","content":"# AD/PA-28/78 Fuel Tank Vent and Vent\n\nHose \\- Modification and Replacement\n\nApplicability: Model PA-28-161 with S/Nos. 28-7816024 to 28-7916475. Model PA-28-181 with S/Nos. 28-7890023 to 28-7990493. Model PA-28-201T with S/Nos. 28-7921001 to 28-7921068. Model PA-28-201 with S/Nos. 28R-7737135 to 28R-7837317. Model PA28RT-201 with S/Nos. 28R-7918001 to 28R-7918172. Model PA28R-201T with S/Nos. 28R-7703309 to 28R-7803373.\n\nModel PA28RT-201T with S/Nos. 28R-7931001 to 28R-7931222. Model PA-28-235 with S/Nos. 28-7710079 to 28-7710089.\n\nModel PA-28-236 with S/Nos. 28-7911001 to 28-7911204.\n\nDocument: Piper SB No. 646.\n\nCompliance: Within 100 hours time in service after 30 November 1979.\n\n#   \n11/79","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating fuel vent system repairs."},"complexity_factors":["Very short document (approximately 150 words)","No defined terms section","No cross-references to other legislation","Simple conditional logic: if you own one of these specific aircraft (identified by model and serial number), you must comply","Single compliance requirement with clear deadline","No exceptions or exemptions stated","Technical content refers to external manufacturer document (Piper SB No. 646) rather than prescribing technical details within the instrument itself"],"plain_english_summary":"This AD requires owners/operators of specified Piper PA-28 Cherokees/Archers/Dakotas/Arrows (listed serials) to modify or replace fuel tank vents and vent hoses per Piper Service Bulletin No. 646, within 100 flight hours after 30 November 1979. \n\nIt addresses blocked/defective vents that can cause fuel starvation and engine power loss, reducing crash risk."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD confines its scope to the listed models and serial numbers and mandates work per Piper SB No. 646 within a fixed 100‑hour window. The text shows no expansion or narrowing beyond that original prescription."},"complexity_factors":["Narrow, enumerated applicability: specific PA‑28 models and serial numbers reduce legal ambiguity.","Single technical remedy referenced: compliance depends on Piper SB No. 646 (manufacturer document).","Short, fixed compliance window (100 hours after 30 Nov 1979) creates scheduling pressure for operators.","Low discretionary decision-making for operators—action is mandatory rather than optional.","Implementation logistics: parts availability, qualified maintenance labour, and aircraft downtime are operational constraints.","Document repeats applicability and compliance terms verbatim, but contains no alternative compliance paths or exemptions."],"plain_english_summary":"Requires modification or replacement of the fuel tank vent and vent hose on specified Piper PA‑28 series aircraft, carried out in accordance with Piper Service Bulletin No. 646. It applies only to the listed serial numbers and must be completed within 100 hours time in service after 30 November 1979.\n\nOwners/operators pay for parts, labour and downtime; the regulator mandates the work and compliance is recorded in maintenance logs. The rule forces a one‑time maintenance action with limited technical discretion; main burdens are cost, parts availability and aircraft downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement","history":"/api/acts/ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement/history","analysis":"/api/acts/ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement/analysis","conflicts":"/api/acts/ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement/conflicts","importantCases":"/api/acts/ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement/important-cases","documents":"/api/acts/ad-pa-28-78-fuel-tank-vent-and-vent-hose-modification-and-replacement/documents"}}