{"id":"F2006B03747","name":"AD/BEECH 23/33 - Fuel Selector Valve","slug":"ad-beech-23-33-fuel-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43341,"registerId":"commonwealth-F2006B03747-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 23/33 - Fuel Selector Valve","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)  \nBeechcraft 19, 23 and 24 Series Aeroplanes\n\nAD/BEECH 23/33 Fuel Selector Valve 8/77\n\nApplicability: Models A23-19, 19A, M19A, B19 with S/Nos. MB-1 to MB-654, 23, A23, A23A, B23 and C23 with S/Nos. M-2 to M-1516; A23-24 and A24 with S/Nos. MA-1 to MA-368; A24R and B24R with S/Nos. MC-2 to MC-180.\n\nRequirement: 1. Unless previously installed under Beechcraft SI No. 0364-289 Rev 3, replace fuel selector guard with a new guard as detailed in Beechcraft SI No. 0838.\n\n    2. Inspect fuel selector guard for correct unusable fuel quantity placard in accordance with Beechcraft SI No. 0838.\n\n    3. Check for freedom from binding and for correct shut-off of the fuel selector valve in accordance with Beechcraft SI No. 0364-289 Revision 3.\n\nNote: Para. 3 is not applicable to aircraft fitted with P/N 169-380086-1 fuel selector valves.\n\nCompliance: For Paras. 1 and 2 \\- Within 100 hours time in service after 31 August 1977.\n\nFor Para. 3 \\- Within 100 hours time in service after 31 August 1977 and thereafter at intervals not exceeding 100 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This appears to be a complete, original Airworthiness Directive from 1977 (as indicated by '8/77' in the title). The scope is tightly focused on fuel selector valve safety modifications for specific Beechcraft models, with no evidence of scope creep or expansion beyond this original safety purpose."},"complexity_factors":["Multiple serial number ranges across four aircraft model families to track","Cross-references to two external Beechcraft Service Instructions (SI No. 0364-289 Rev 3 and SI No. 0838)","One explicit exemption (Note excluding P/N 169-380086-1 valves from Para. 3)","Different compliance timeframes for different paragraphs (Paras 1-2 vs Para. 3)","Ongoing repetitive inspection requirement for Para. 3 (every 100 hours)","Conditional applicability ('Unless previously installed') for Para. 1"],"plain_english_summary":"This AD mandates safety actions on the fuel selector valve for certain Beechcraft 19/23/24-series aircraft: install a new selector guard, verify the unusable-fuel placard, and ensure the valve moves freely and seals in OFF (the latter not required if P/N 169-380086-1 is installed). It affects owners/operators of 1960s–70s Musketeer/Sport/Sundowner/Sierra variants and prevents in-flight engine stoppage from selector failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No. The directive is narrowly targeted to the fuel‑selector guard, unusable‑fuel placard and selector operation for the listed Beechcraft models and serial ranges. It prescribes replacement, verification and recurring checks, with one part‑number exception and 100‑hour compliance intervals; it does not expand or narrow applicability beyond the stated list."},"complexity_factors":["Applicability spans multiple models and specific serial‑number ranges — operators must check serial numbers to determine if the AD applies (Applicability).","Three distinct actions are required: guard replacement, placard inspection, and valve freedom/shut‑off checks (Requirements Paras. 1–3).","Mandatory compliance references external Beechcraft Service Instructions (SI No. 0838 and SI No. 0364‑289 Rev 3) — work scope depends on those documents.","An explicit exception for aircraft fitted with a particular part number (P/N 169‑380086‑1) changes who must carry out recurring checks (Note).","Time‑based deadlines and recurring 100‑hour inspection intervals introduce scheduling, recordkeeping and potential downtime (Compliance)."],"plain_english_summary":"This airworthiness directive requires owners/operators of specified Beechcraft 19/23/24‑series aeroplanes (listed by model and serial number) to replace the fuel‑selector guard if not already modified, verify the unusable‑fuel placard, and inspect the selector for freedom and correct shut‑off per Beechcraft service instructions. Compliance actions must occur within 100 hours time‑in‑service, and selector operation checks repeat every 100 hours where applicable. Mechanically it mandates a parts change plus recurring inspections; owners bear parts and labour costs and must schedule the work to avoid grounding."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-23-33-fuel-selector-valve","history":"/api/acts/ad-beech-23-33-fuel-selector-valve/history","analysis":"/api/acts/ad-beech-23-33-fuel-selector-valve/analysis","conflicts":"/api/acts/ad-beech-23-33-fuel-selector-valve/conflicts","importantCases":"/api/acts/ad-beech-23-33-fuel-selector-valve/important-cases","documents":"/api/acts/ad-beech-23-33-fuel-selector-valve/documents"}}