{"id":"F2006B10151","name":"AD/GA-7/7 - Fuel Line Chafing - Inspection","slug":"ad-ga-7-7-fuel-line-chafing-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55730,"registerId":"commonwealth-F2006B10151-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GA-7/7 - Fuel Line Chafing - Inspection","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)  Gulfstream (Grumman American) GA-7 Series Aeroplanes\n\n \n\nAD/GA-7/7 Fuel Line Chafing - Inspection NK\n\nApplicability: Model GA-7 with S/Nos. GA-7-0001 to GA-7-0076. Document:  1. GAC SB No. ME-14; or\n\n2. FAA AD 79-05-06 amendment 39-3423.\n\n \n\nCompliance: Within 25 hours time in service after 9 April 1979.\n\n \n\nBackground: The main fuel line aft of the left hand engine firewall may be chafed by the propeller control cable.\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 directive, as presented, applies to Model GA-7 aircraft with serial numbers GA-7-0001 to GA-7-0076 and requires inspection within a specified 25-hour time-in-service window after 9 April 1979. The text provides no indication that the applicability, required action, or compliance window has been altered from the instrument's stated terms; it instead points operators to two external documents for technical procedures (Applicability; Compliance)."},"complexity_factors":["Narrow applicability limited to a specific model and serial number range (GA-7-0001 to GA-7-0076).","Single, clearly stated required action (inspection) with a short, fixed compliance window (25 hours TIS after 9 April 1979).","Dependence on external technical documents (GAC SB No. ME-14 or FAA AD 79-05-06) for inspection procedures and any corrective action adds procedural reliance and potential ambiguity.","Technical subject matter (fuel line chafing and propeller control cable interaction) requires qualified maintenance personnel, raising practical implementation considerations.","Temporal specificity (deadline tied to a calendar date and flight hours) increases operational urgency and scheduling pressure for operators."],"plain_english_summary":"What this instrument does (mechanically)\n\n- Requires an inspection of the main fuel line located aft of the left-hand engine firewall on certain Gulfstream (Grumman American) GA-7 aeroplanes. The inspection must be carried out within 25 hours time in service after 9 April 1979 and performed in accordance with either GAC Service Bulletin No. ME-14 or FAA AD 79-05-06 (Applicability; Compliance).\n\nWho it affects\n\n- Owners and operators of Gulfstream (Grumman American) Model GA-7 aeroplanes with serial numbers GA-7-0001 through GA-7-0076 (Applicability).\n- The maintenance organisations and persons who carry out inspections and any corrective work, because the directive points them to specific technical documents for the inspection and any follow-up actions (Applicability).\n\nWhy it matters (official rationale and practical implications)\n\n- The stated reason is that the main fuel line aft of the left-hand engine firewall may be chafed by the propeller control cable (Background). The inspection is intended to detect chafing early.\n\nPractical mechanics, incentives and trade-offs\n\n- Who pays: Aircraft owners/operators pay for the inspection, and for any corrective work if chafing is found (Compliance; Applicability). The directive itself does not state who performs the work, but it points to service/airworthiness documents that set out procedures (Applicability).\n- What operators must do: Arrange for an inspection within the specified 25-hour window and follow the procedures in GAC SB No. ME-14 or FAA AD 79-05-06 (Compliance; Applicability). If the referenced documents require corrective action, operators will also need to arrange and pay for those actions.\n- Time and scheduling impact: The short compliance window (25 hours time in service after 9 April 1979) creates an immediate scheduling requirement for affected aircraft; that can displace planned flying or require urgent maintenance slots (Compliance).\n- Compliance burden and implementation risk: The directive is narrowly targeted (specific model and serial number range) and prescribes external technical documents; this reduces ambiguity about inspection technique but creates dependency on those documents. If the referenced documents are unclear or supply additional required steps, operators must follow them, adding to potential workload and cost (Applicability).\n- Effects on businesses and competition: The measure creates demand for inspection and possible repair work. Independent maintenance providers that are qualified to work on GA-7 aircraft can perform the inspections, so the directive mostly shifts immediate work to the maintenance market rather than altering longer-term ownership or competition dynamics (Applicability; Compliance).\n- Trade-offs and opportunity costs: The instrument trades near-term inspection and possible repair costs and aircraft downtime against mitigation of the hazard described (fuel line chafing by propeller control cable). The directive does not describe probability or severity of outcomes beyond noting the chafing possibility (Background).\n\nWhere the directive leaves discretion and where it is prescriptive\n\n- Prescriptive elements: It prescribes which aircraft are covered, the time window for compliance, and the technical documents to use for the inspection (Applicability; Compliance).\n- Discretion: The text does not detail specific corrective steps in the directive itself; it defers to the referenced service bulletin or FAA AD for the technical procedure, so the exact nature and cost of corrective work depend on those documents (Applicability)."},"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 a specific aircraft model. It has not expanded beyond its original purpose of mandating a one-time inspection for fuel line chafing."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (model and serial number range)","Single compliance requirement with clear deadline","No cross-references to other legislation or complex conditional logic","Straightforward safety issue with simple inspection remedy","Minimal regulatory machinery — essentially a single mandatory instruction"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific Gulfstream GA-7 aeroplanes to inspect the main fuel line located behind the left-hand engine firewall. The concern is that this fuel line may be rubbing (\"chafing\") against the propeller control cable, which could wear through the fuel line and cause a fire or fuel leak.\n\n**Who it affects:** \n- **Aircraft owners/operators** of Gulfstream (formerly Grumman American) GA-7 model aeroplanes with serial numbers GA-7-0001 through GA-7-0076.\n- **Maintenance engineers** who must carry out the inspection.\n\n**What must be done:**\n- Inspect the fuel line for damage caused by rubbing against the propeller control cable.\n- **Deadline:** Complete this inspection within 25 hours of flying time after 9 April 1979.\n\n**Why it matters:** Chafing can wear holes in fuel lines, leading to fuel leaks near hot engine components — a serious fire risk. This directive prevents potential accidents by catching the problem early.\n\n**Technical references:** The inspection must follow either Gulfstream's Service Bulletin ME-14 or the equivalent US Federal Aviation Administration directive (FAA AD 79-05-06)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ga-7-7-fuel-line-chafing-inspection","history":"/api/acts/ad-ga-7-7-fuel-line-chafing-inspection/history","analysis":"/api/acts/ad-ga-7-7-fuel-line-chafing-inspection/analysis","conflicts":"/api/acts/ad-ga-7-7-fuel-line-chafing-inspection/conflicts","importantCases":"/api/acts/ad-ga-7-7-fuel-line-chafing-inspection/important-cases","documents":"/api/acts/ad-ga-7-7-fuel-line-chafing-inspection/documents"}}