{"id":"F2006B04969","name":"AD/CESSNA 170/40 - Mixture Control Connection","slug":"ad-cessna-170-40-mixture-control-connection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44852,"registerId":"commonwealth-F2006B04969-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/40 - Mixture Control Connection","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 170/40 Mixture Control Connection 10/80\n\nApplicability: Model 172RG with S/Nos 172RG-0001 to 172RG-0573.\n\nRequirement: (a) Inspect the mixture control connection at the carburettor mixture arm to ensure that the control cable inner wire is secured to the clamp at the arm with an AN960-10 (approx 063ins. thick) washer installed between wire and retaining nut and an AN960-10L (approx .032ins. thick) washer installed between wire and arm.\n\n    (b) If the parts are assembled correctly, check that the minimum torque on the MS20365-1032C retaining nut is 15 inch-pounds and that the P/N S2323-11 clamp will swivel in the mixture control arm.\n\n    (c) If the parts are assembled incorrectly, remove and discard the MS20365-1032C nut. Install washers in correct sequence and fit new MS20365-1032C nut. Torque nut to 15 inch-pounds minimum and ensure that P/N S2323-11 clamp will swivel in the mixture control arm.\n\nCompliance: Within 25 hours time in service after 7 October 1980.\n\nBackground: Incorrect assembly of the mixture control connection during manufacture may cause slippage of the control wire and result in engine power loss due to lean mixture.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive targeting a specific manufacturing defect in a limited aircraft population. It has not expanded beyond its original purpose of addressing the mixture control assembly defect."},"complexity_factors":["Single, discrete mechanical inspection task with clear pass/fail criteria","Only 3 specific part numbers referenced (AN960-10, AN960-10L, MS20365-1032C, S2323-11)","No defined terms section or interpretive provisions","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Linear structure: applicability → requirement → compliance → background","Single exception path (if incorrect, then fix) with no nested conditions"],"plain_english_summary":"This CASA Airworthiness Directive requires owners of specified Cessna 172RGs (s/n 172RG‑0001 to 172RG‑0573) to inspect and, if necessary, correct the mixture control connection at the carburettor because an incorrect factory assembly can let the control cable slip and cause sudden engine power loss.  \n\nInspections and any repairs must be done within 25 flight hours after 7 October 1980 to ensure safe fuel‑air mixture control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive is targeted to specified 172RG serial numbers to correct an assembly error that may cause mixture‑control wire slippage. It does not expand obligations beyond inspection and correction of the identified connection, and retains the original corrective scope and a fixed compliance deadline."},"complexity_factors":["Narrow applicability by model and serial numbers (172RG‑0001 to 172RG‑0573) reduces scope complexity.","Technical specificity: requires particular part numbers (AN960‑10, AN960‑10L, S2323‑11, MS20365‑1032C) and an exact minimum torque (15 in‑lb).","Short compliance window (25 hours TIS after 7 Oct 1980) creates operational timing pressure for operators.","Clear, prescriptive inspect/replace steps limit regulatory discretion and interpretive complexity.","Safety‑critical mechanical outcome (prevent control‑wire slippage) raises stakes for correct execution.","Implementation requires access to the carburettor and basic maintenance skills or certified maintenance support."],"plain_english_summary":"Orders owners/operators of Cessna 172RG aeroplanes (S/Ns 172RG‑0001 to 172RG‑0573) to inspect the carburettor mixture‑control connection and ensure specified washers, clamp (P/N S2323‑11) and retaining nut (MS20365‑1032C) are fitted and torqued so the clamp can swivel. If assembled incorrectly, the nut must be replaced, washers fitted in sequence and torque set to at least 15 inch‑pounds, then verified.\n\nCompliance is required within 25 hours time‑in‑service after 7 October 1980. Owners/operators pay inspection and repair costs. The stated purpose is to prevent control‑wire slippage that may cause engine power loss."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-40-mixture-control-connection","history":"/api/acts/ad-cessna-170-40-mixture-control-connection/history","analysis":"/api/acts/ad-cessna-170-40-mixture-control-connection/analysis","conflicts":"/api/acts/ad-cessna-170-40-mixture-control-connection/conflicts","importantCases":"/api/acts/ad-cessna-170-40-mixture-control-connection/important-cases","documents":"/api/acts/ad-cessna-170-40-mixture-control-connection/documents"}}