{"id":"F2006B05018","name":"AD/CESSNA 177/24 - Fuel Quantity Transmitter","slug":"ad-cessna-177-24-fuel-quantity-transmitter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44928,"registerId":"commonwealth-F2006B05018-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 177/24 - Fuel Quantity Transmitter","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)  Cessna 177 Series Aeroplanes\n\n \n\nAD/CESSNA 177/24 Fuel Quantity Transmitter 3/79\n\nApplicability: All models 177 and 177RG with S/Nos. 17700001 thru 17702672, 177RG001 thru 177RG1266 and F177RG0001 thru F177RG0177.\n\n \n\nRequirement: Action in accordance with Cessna SL SE78-69. Compliance:  Within 100 hours time in service after 28 February 1979.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied AD text sets a clear applicability (specific serial-number ranges), a single requirement (perform work per Cessna SL SE78-69) and a deadline (within 100 hours TIS after 28 February 1979). The document itself does not reference any earlier or later versions, nor does it state that the scope has been expanded or narrowed relative to an earlier instrument. On the basis of the text provided, there is no evidence within the instrument that the scope has changed from an earlier intent."},"complexity_factors":["Short, single-item mandate: the AD requires one action referenced to an external service letter (low procedural complexity).","Cross-reference to an external document (Cessna SL SE78-69) increases practical complexity because the AD does not contain procedural detail.","Serial-number-specific applicability requires checking aircraft records to determine effect on each tail number.","A fixed compliance window (100 hours TIS after 28 February 1979) imposes scheduling constraints.","The AD text omits allocation of cost, verification procedures, or enforcement mechanics, leaving those operational details to implementers."],"plain_english_summary":"This Airworthiness Directive requires specified Cessna 177 and 177RG aeroplanes (listed serial ranges) to receive the action set out in Cessna Service Letter SE78‑69 within 100 hours time‑in‑service after 28 February 1979. It creates a mandatory duty for owners/operators to arrange and complete that work but defers procedural detail, costs, and verification to the service letter and local operational arrangements."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1979 with a narrow technical scope (one component on specific aircraft). It has not expanded beyond its original purpose of addressing a specific fuel transmitter defect."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined elements: applicability (serial number ranges) and compliance deadline","Single cross-reference to external technical document (Cessna Service Letter SE78-69)","No nested conditions or exceptions","Straightforward command structure: identify aircraft → perform action → meet deadline"],"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) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Cessna 177 aircraft to inspect or fix a problem with the **fuel quantity transmitter** — the device that tells the pilot how much fuel is in the tank. The directive references a Cessna Service Letter (SL SE78-69) which contains the detailed technical instructions.\n\n**Who it affects:** Owners and operators of:\n- Cessna 177 and 177RG models\n- Specific serial numbers: 17700001 through 17702672, 177RG001 through 177RG1266, and F177RG0001 through F177RG0177\n\n**When it had to be done:** Within 100 hours of flying time after 28 February 1979.\n\n**Why it matters:** Faulty fuel gauges can lead to fuel starvation, engine failure, and accidents. This AD ensures a known defect gets fixed before it causes an incident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-24-fuel-quantity-transmitter","history":"/api/acts/ad-cessna-177-24-fuel-quantity-transmitter/history","analysis":"/api/acts/ad-cessna-177-24-fuel-quantity-transmitter/analysis","conflicts":"/api/acts/ad-cessna-177-24-fuel-quantity-transmitter/conflicts","importantCases":"/api/acts/ad-cessna-177-24-fuel-quantity-transmitter/important-cases","documents":"/api/acts/ad-cessna-177-24-fuel-quantity-transmitter/documents"}}