{"id":"F2006B04986","name":"AD/CESSNA 170/58 - Nose Landing Gear Actuator Attach Fitting","slug":"ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44882,"registerId":"commonwealth-F2006B04986-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/58 - Nose Landing Gear Actuator Attach Fitting","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 170, 172, F172, FR172 and 175 Series Aeroplanes\n\nAD/CESSNA 170/58 Nose Landing Gear Actuator Attach Fitting 8/95\n\nApplicability: All Cessna 172RG aircraft with Serial Numbers 172RG0001 to 172RG1191 without Cessna reinforcement kit SK172-142 installed.\n\nRequirement: 1. a. Remove the 6 AN23-9A bolts attaching the nose landing gear actuator fitting (P/N 2413002-3) to the lower fuselage skin.\n\n1. b. Inspect the actuator fitting for cracks at the bolt holes using fluorescent penetrant.\n\n1. c. Visually inspect the bolt holes in the skin for elongation and cracking. Replace the skin if elongation in any hole exceeds 0.03 inches.\n\nNote: Cessna Service Bulletin SEB93-8 and Service Kit SK172-142 refer.\n\nCompliance: Initially inspect in accordance with Requirement 1 before 50 hours time in service after 20 July 1995 or before 20 October 1995, whichever occurs first.\n\nRe-inspect at intervals not to exceed 300 hours time in service.\n\nBackground: There have been a number of reports of cracking of the nose landing gear actuator fitting and associated elongation of fastener holes in the skin. In two of the reports the fitting was cracked 80% through the thickness. Fitting failure could result in collapse of the nose landing gear.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety defect in a specific aircraft type. The scope remains precisely limited to the nose landing gear actuator fitting issue as originally identified."},"complexity_factors":["Single, specific aircraft model and serial number range","Straightforward three-step inspection requirement (remove, inspect, replace if needed)","Only one defined term ('time in service' — implied standard aviation term)","Clear compliance deadline with simple alternative trigger (hours vs calendar date)","Single cross-reference to manufacturer service bulletin (informational only)","No nested exceptions or conditional logic — applicability is binary (has/doesn't have reinforcement kit)"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Cessna 172RGs (s/n 172RG0001–172RG1191) without kit SK172-142 to inspect and, if needed, repair the nose landing gear actuator fitting and adjacent skin. It requires removal of the fitting bolts, fluorescent penetrant inspection for cracks, and replacement of skin if bolt holes are stretched beyond tolerance.\n\nInitial inspection is before 50 flight hours after 20 July 1995 or by 20 Oct 1995, then every 300 flight hours. Failure could cause nose gear collapse."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is confined to identified Cessna 172RG serial numbers without the reinforcement kit and prescribes inspection and repair steps; the instrument does not expand or narrow that applicability beyond the text provided."},"complexity_factors":["Narrow applicability limited to specific serial-numbered aircraft lacking kit SK172-142","Requires physical removal of actuator fasteners and a fluorescent-penetrant crack inspection","Quantitative replacement trigger (skin hole elongation > 0.03 inches)","Fixed initial compliance window (50 flight hours or a calendar date) plus recurring 300‑hour intervals","References manufacturer service bulletin and kit for corrective action details"],"plain_english_summary":"This airworthiness directive requires owners/operators of certain Cessna 172RG aeroplanes (serials 172RG0001–172RG1191) without reinforcement kit SK172‑142 to remove and inspect the nose‑landing‑gear actuator attach fitting and the adjacent fuselage skin for cracking and hole elongation. It aims to prevent nose‑gear collapse by detecting cracked fittings or overstressed skin.\n\nThe cost and work fall on aircraft owners/operators: repairs (including skin replacement if any hole elongation exceeds 0.03 inches) and recurring inspections every 300 flight hours, with an initial short‑term compliance deadline."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting","history":"/api/acts/ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting/history","analysis":"/api/acts/ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting/analysis","conflicts":"/api/acts/ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting/conflicts","importantCases":"/api/acts/ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting/important-cases","documents":"/api/acts/ad-cessna-170-58-nose-landing-gear-actuator-attach-fitting/documents"}}