{"id":"F2006B04899","name":"AD/CESSNA 120/11 - Primer Line","slug":"ad-cessna-120-11-primer-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44725,"registerId":"commonwealth-F2006B04899-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nCessna 120 and 140 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CESSNA 120/11 Primer Line 7/2003","sectionType":"part","heading":"AD/CESSNA 120/11 Primer Line 7/2003","content":"# AD/CESSNA 120/11 Primer Line 7/2003\n\nApplicability: Cessna 120 and 140 aircraft up to and including serial number 11842.\n\nRequirement: Unless previously accomplished reroute the primer line, adjust the strainer, and install a shield to the primer liner in accordance with Cessna Service Letter 34.\n\nNote: FAA AD 47-43-01 refers.\n\nCompliance: At the next scheduled maintenance visit.\n\nThis Airworthiness Directive becomes effective on 10 July 2003.\n\nBackground: Failure to reroute the primer could lead to fuel coming into contact with exhaust manifold.\n\n![](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 28 May 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue airworthiness directive addressing a specific mechanical defect. The scope remains tightly focused on the identified unsafe condition (primer line routing) for the specified aircraft models."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability criterion (serial number range)","Single requirement with 3 specific actions","No cross-references to other legislation beyond a non-binding note about FAA AD","Simple compliance trigger (next scheduled maintenance)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"CASA has issued a safety order for Cessna 120/140 aeroplanes (serials up to 11842) after finding the primer fuel line routed too close to the exhaust manifold, creating a fire risk if it leaks. Owners/operators must, at the next scheduled maintenance, reroute the primer line, adjust the strainer, and fit a protective shield per Cessna Service Letter 34. This measure prevents potential in‑flight fires and aligns with an earlier FAA directive."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD stays within the original safety-focused scope: it applies only to Cessna 120/140 aircraft up to serial 11842 and mandates specified corrective maintenance per the referenced service letter to prevent fuel contacting the exhaust manifold. It does not broaden applicability or add measures beyond those required in the directive."},"complexity_factors":["Narrow applicability: specific aircraft types and serial-number cap (Cessna 120/140 up to SN 11842)","Prescriptive technical actions but reliance on an external document (Cessna Service Letter 34) for detailed instructions","Compliance timing tied to 'next scheduled maintenance' (operational scheduling and downtime considerations)","Mandatory regulatory authority: issued under CASR 1998 subreg 39.1(1) with limited operator discretion","Cross-reference to FAA AD 47-43-01 (international regulatory linkage)","Direct costs borne by owners/operators for maintenance and parts; potential opportunity cost from aircraft out-of-service time"],"plain_english_summary":"This AD requires owners/operators of Cessna 120 and 140 aeroplanes (serial numbers up to 11842) to reroute the primer line, adjust the strainer and fit a primer shield in accordance with Cessna Service Letter 34. CASA issued the mandatory measure under CASR subreg 39.1(1) to prevent fuel contacting the exhaust manifold. Owners/operators pay for the work and must have it done at the next scheduled maintenance visit; the AD cross-references FAA AD 47-43-01."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-120-11-primer-line","history":"/api/acts/ad-cessna-120-11-primer-line/history","analysis":"/api/acts/ad-cessna-120-11-primer-line/analysis","conflicts":"/api/acts/ad-cessna-120-11-primer-line/conflicts","importantCases":"/api/acts/ad-cessna-120-11-primer-line/important-cases","documents":"/api/acts/ad-cessna-120-11-primer-line/documents"}}