{"id":"F2006B04995","name":"AD/CESSNA 170/66 - Fuel Selector Valve","slug":"ad-cessna-170-66-fuel-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44897,"registerId":"commonwealth-F2006B04995-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 170/66 Fuel Selector Valve 3/2","sectionType":"part","heading":"AD/CESSNA 170/66 Fuel Selector Valve 3/2000 TX","content":"# AD/CESSNA 170/66 Fuel Selector Valve 3/2000 TX\n\nApplicability: Model 170, 172, F172, FP172, FR172, P172, R172 and 175 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| 170B  | 609,19401, 20267 through 20999,25000 through 27169      | 172   | 610, 612, 615, 28000 through29999, 36000 through 36999, 46001through 46754            |\n| 172A  | 622, 625, 46755 through 47746                           | 172B  | 630, 17247747 through 17248734                                                        |\n| 172C  | 17248735 through 17249544                               | 172D  | 17249545 through 17250572                                                             |\n| 172E  | 639, 17250573 through 17251822                          | 172F  | 17251823 through 17253392                                                             |\n| 172G  | 17253393 through 17254892                               | 172H  | 638, 17254893 through 17256492,17256494 through 17256512                              |\n| 172I  | 17256513 through 17257161                               | 172K  | 17257162 through 17259223                                                             |\n| 172L  | 17259224 through 17260758                               | 172M  | 17256493,17260759 through17261444, 17261446 through17261577, 17261579 through17263458 |\n| F172D | F172-0001 through F172-0018                             | F172E | F172-0019 through F172-0085                                                           |\n| F172F | F172-0086 through F172-0179                             | F172G | F172-0180 through F172-0319                                                           |\n| F172H | F172-0320 through F172-0654 F17200655 through F17200754 | F172K | F17200755 through F17200804                                                           |","sortOrder":1}],"analysis":{"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":4,"scope_assessment":{"changed":false,"description":"This appears to be a standard, targeted Airworthiness Directive focused on a specific manufacturing defect in fuel selector valves from a specific production period. The scope remains tightly constrained to the identified unsafe condition and affected aircraft population. No evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Extensive serial number tables with multiple ranges and gaps (e.g., \"17256494 through 17256512\" but excluding 17256493 in one range)","Dual applicability criteria: must match BOTH specific serial numbers AND specific part numbers shipped in a narrow date window (6 Dec 1998 – 10 May 1999)","Multiple aircraft model variants (170B, 172A through 172M, F172D through F172K, etc.) with different serial number ranges","Cross-references to undefined sections: document references \"requirement section,\" \"compliance section,\" and \"background section\" that are not fully included in the provided text","Technical aviation terminology (Airworthiness Directive, aeronautical product, delegate) requiring domain knowledge","Nested applicability: (a) listed below by serial number; AND (b) equipped with specific parts... that Cessna shipped during specific dates"],"plain_english_summary":"This AD requires owners/operators of certain Cessna 170, 172 and 175 series aircraft to inspect/repair or replace specific fuel selector valves that Cessna shipped between 6 Dec 1998 and 10 May 1999 (cam P/N 0513123; valve P/Ns 0513120-5, -6, -8, -9, -200).  \n\nIt’s mandatory because a defective valve can cause fuel starvation, engine failure or fire—so affected aircraft cannot legally fly until the required actions are completed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope is confined to the listed aircraft models and serial numbers fitted with the specified fuel selector valve parts/cam shipped between 6 Dec 1998 and 10 May 1999. The instrument does not expand applicability beyond those enumerated categories."},"complexity_factors":["Very specific applicability: long serial‑number ranges across multiple models require precise aircraft identification.","Part‑level targeting: multiple part numbers and a cam part number plus shipment date window increase parts/records checks.","Procedural compliance: requirement to act “in accordance with the instructions” implies technical maintenance procedures and timing obligations.","Administrative burden: operators must check logs/receipts to confirm part origin and schedule corrective work.","Regulatory enforcement: issued under CAR 1998 subreg 39.1(1), creating binding mandatory compliance rather than guidance."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Cessna 170, 172, F172, FP172, FR172, P172, R172 and 175-series aeroplanes fitted with particular fuel selector valve parts or a cam (parts shipped 6 Dec 1998–10 May 1999) to take corrective action to address an identified unsafe condition in the fuel selector valve. It matters because it forces inspections, repairs or replacements at prescribed times, creating direct costs, record‑checking and parts‑sourcing burdens for operators while the regulator enforces compliance under CAR 1998 subreg 39.1(1)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-66-fuel-selector-valve","history":"/api/acts/ad-cessna-170-66-fuel-selector-valve/history","analysis":"/api/acts/ad-cessna-170-66-fuel-selector-valve/analysis","conflicts":"/api/acts/ad-cessna-170-66-fuel-selector-valve/conflicts","importantCases":"/api/acts/ad-cessna-170-66-fuel-selector-valve/important-cases","documents":"/api/acts/ad-cessna-170-66-fuel-selector-valve/documents"}}