{"id":"F2006B11333","name":"AD/MSR/4 - L/H Fuel Supply Hose - Replacement Fuel Gauge Vent - Modification","slug":"ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57210,"registerId":"commonwealth-F2006B11333-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/4 - L/H Fuel Supply Hose - Replacement Fuel Gauge Vent - 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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Aerospatiale Rallye Series Aeroplanes\n\n \n\nAD/MSR/4 L/H Fuel Supply Hose - Replacement Fuel Gauge Vent - Modification\n\n\n8/62\n\n \n\nApplicability: Fuel Supply Hose - Aircraft with S/Nos. 1 to 100 - Vent Mod - Aircraft with S/Nos. 1 to 107.\n\n \n\nDocument: Rallye SB No. 9. Compliance: Forthwith.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text does not indicate any change in scope from an earlier or different instrument. The directive sets a clear, limited scope: required modification/replacement actions for Aerospatiale Rallye aircraft within the specified serial-number ranges, to be carried out according to Rallye SB No. 9 and complied with forthwith under Part 39 of the Civil Aviation Regulations 1998."},"complexity_factors":["Short, focused directive with limited scope (applies only to Aerospatiale Rallye series aircraft) — (Applicability).","Different serial-number ranges for two related items (L/H fuel supply hose: S/N 1–100; vent modification: S/N 1–107) requiring implementers to check aircraft identity — (Applicability).","Technical work and specifications are delegated to an external document (Rallye SB No. 9), requiring operators to obtain and follow that service bulletin — (Document: Rallye SB No. 9).","Immediate compliance timeframe ('Forthwith') creates a short implementation window for owners/operators — (Compliance: Forthwith).","Legal basis under Part 39 of the Civil Aviation Regulations 1998 imposes mandatory regulatory effect though the AD text is brief — (Civil Aviation Regulations 1998, PART 39 - 105)."],"plain_english_summary":"This directive requires owners/operators of Aerospatiale Rallye aeroplanes in the specified serial-number ranges to immediately replace the left‑hand fuel supply hose and, where applicable, the fuel‑gauge vent by following Rallye Service Bulletin No. 9. Compliance is required forthwith; affected operators are responsible for arranging the work and bearing parts, labour and downtime costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing specific known defects in early production aircraft. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges)","Single cross-reference to external technical document (Service Bulletin No. 9)","No conditional logic or nested exceptions","Simple imperative compliance requirement ('Forthwith')","No interpretation section or defined terms"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by the Civil Aviation Safety Authority (CASA) for **Aerospatiale Rallye series aeroplanes**.\n\n**What it does:**\n- Requires two specific safety fixes on certain aircraft:\n  1. **Replacement of the left-hand (L/H) fuel supply hose** on aircraft with serial numbers 1 to 100\n  2. **Modification of the fuel gauge vent** on aircraft with serial numbers 1 to 107\n\n**Who it affects:**\n- Owners and operators of early-model Aerospatiale Rallye aircraft (specific serial number ranges)\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. They are issued when an unsafe condition is found in an aircraft type that is likely to exist or develop in other aircraft of the same type.\n- \"Compliance: Forthwith\" means this must be done **immediately** — there is no grace period.\n- The reference to \"Rallye SB No. 9\" (Service Bulletin) provides the technical instructions for completing the work.\n\n**Key takeaway:** If you own or operate an early Rallye aircraft in these serial number ranges, you must get this fuel system work done immediately to keep your aircraft legally airworthy and safe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification","history":"/api/acts/ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification/history","analysis":"/api/acts/ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification/analysis","conflicts":"/api/acts/ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification/conflicts","importantCases":"/api/acts/ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification/important-cases","documents":"/api/acts/ad-msr-4-l-h-fuel-supply-hose-replacement-fuel-gauge-vent-modification/documents"}}