{"id":"F2006B05026","name":"AD/CESSNA 177/31 - Fuel Selector Valve","slug":"ad-cessna-177-31-fuel-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44936,"registerId":"commonwealth-F2006B05026-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.002.png)\n\n![](image.002.png)  \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 CAR 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 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.","sortOrder":0},{"sectionNumber":"AD/CESSNA 177/31 Fuel Selector Valve 3/2","sectionType":"part","heading":"AD/CESSNA 177/31 Fuel Selector Valve 3/2000 TX","content":"# AD/CESSNA 177/31 Fuel Selector Valve 3/2000 TX\n\nApplicability: Model 177 series aeroplanes as,\n\n    (a) listed below by serial number; and\n\n    (b) equipped with Fuel Selector Valve Cam part number 0513123, or Fuel Selector Valve part number 0513120-5, 0513120-6, 0513120-8, 0513120-9, or 0513120- 200 that Cessna shipped from 6 December 1998 through 10 May 1999.\n\n| Model | Serial Numbers                         | Model | Serial Numbers            |\n| ----- | -------------------------------------- | ----- | ------------------------- |\n| 177   | 661,17700001, 17700003through 17701164 | 177A  | 17701165 through 17701370 |\n| 177B  | 17700002, 17701371through 17702752     |       |                           |\n\nNote 1: The assessment of applicability may be made by the Certificate of Registration Holder by a review of maintenance records.\n\nRequirement: (a) Replace any installed Fuel Selector Valve Cam part number 0513123, or Fuel Selector Valve part number 0513120-5, 0513120-6, 0513120-8, 0513120-9, or\n\n0513120-200, that Cessna shipped from 6 December 1998 through 10 May 1999, in accordance with Cessna Service Bulletin SEB99-7 dated June 7, 1999.\n\n(b) A fuel selector valve cam or fuel selector valve, as identified in paragraph (a) of the Requirement, must not be installed as a replacement part on any aeroplane applicable to this AD, after the effective date of this AD.\n\nNote 2: FAA AD 99-27-02 refers.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is confined to the listed Cessna 177 serial numbers and the specified fuel selector valve cams/valves shipped 6 Dec 1998–10 May 1999. The AD's requirements — mandatory replacement per the Cessna service bulletin and a ban on reinstalling the identified parts — align with the instrument's stated purpose of correcting the unsafe condition and do not broaden applicability beyond those items."},"complexity_factors":["Narrow applicability: specific Cessna 177 models and listed serial number ranges (Applicability).","Limited parts list: only certain fuel selector valve cams/valves shipped between defined dates are targeted (Applicability; Requirement (a)).","Prescriptive compliance: replacement must follow Cessna Service Bulletin SEB99-7, creating a single technical compliance path (Requirement (a)).","Prohibition on reinstalling listed parts after the AD takes effect increases ongoing parts control and inventory checks (Requirement (b)).","Certificate of Registration Holder may determine applicability by reviewing maintenance records, creating an administrative compliance action (Note 1).","Potential operational cost and downtime for owners/operators to source and fit replacement parts (implied by Requirement and Service Bulletin reference).","Cross-reference to FAA AD 99-27-02 may require alignment with overseas compliance history/documentation (Note 2)."],"plain_english_summary":"This AD requires owners/operators of specified Cessna 177-series aeroplanes to replace particular fuel selector valve cams and valves that Cessna shipped between 6 December 1998 and 10 May 1999, and forbids their re‑installation. Replacement must be carried out in accordance with Cessna Service Bulletin SEB99-7.\n\nCertificate of Registration holders must review maintenance records to determine applicability. Affected parties pay for parts and labour and must arrange compliance to correct the identified unsafe condition."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific manufacturing defect in fuel selector valves for a limited production run of Cessna 177 series aircraft. The scope has not expanded beyond this specific safety issue."},"complexity_factors":["Limited conditional logic — only two main requirements (replace existing parts, prohibit future installation)","Specific but narrow applicability — three aircraft models with defined serial number ranges and specific part numbers","Single cross-reference to FAA AD 99-27-02 and Cessna Service Bulletin SEB99-7 for technical implementation details","No nested exceptions or complex definitional sections — interpretation section is minimal","Straightforward compliance structure — action required based on part manufacture dates (6 Dec 1998 to 10 May 1999)"],"plain_english_summary":"This CASA airworthiness directive mandates replacement of certain fuel selector valves and cams shipped by Cessna (Dec 1998–May 1999) on affected Cessna 177/177A/177B Cardinals and prohibits reinstalling those parts.  \n\nIt affects owners, operators and maintenance personnel of the listed serial-numbered aircraft — required because defective valves can cause fuel starvation, engine failure, and loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-31-fuel-selector-valve","history":"/api/acts/ad-cessna-177-31-fuel-selector-valve/history","analysis":"/api/acts/ad-cessna-177-31-fuel-selector-valve/analysis","conflicts":"/api/acts/ad-cessna-177-31-fuel-selector-valve/conflicts","importantCases":"/api/acts/ad-cessna-177-31-fuel-selector-valve/important-cases","documents":"/api/acts/ad-cessna-177-31-fuel-selector-valve/documents"}}