{"id":"F2006L00145","name":"AD/SF340/98 - Main Landing Gear Shock Strut Uplock Axle","slug":"ad-sf340-98-main-landing-gear-shock-strut-uplock-axle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58035,"registerId":"commonwealth-F2006L00145-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"SAAB SF340 Series Aeroplanes","sectionType":"division","heading":"SAAB SF340 Series Aeroplanes","content":"### SAAB SF340 Series Aeroplanes\n\n| AD/SF340/98 | Main Landing Gear Shock Strut Uplock Axle | 2/2006 |\n| ----------- | ----------------------------------------- | ------ |\n\n| Applicability: | Model SF340A aircraft, serial numbers 004 through 159.Model 340B aircraft, serial numbers 160 through 459.                                                                                                                    |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with SAAB Aircraft AB Service Bulletin SAAB 340-32-132, dated 3 November 2005, or later CAA approved revision.Note: Swedish CAA AD AD 1-199 refers.                                                      |\n| Compliance:    | Before 9 May 2006.                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 16 February 2006.                                                                                                                                                           |\n| Background:    | A report was received of a cracked main landing gear shock strut uplock axle. The cause was determined to be hydrogen embrittlement. All uplock axles produced in the same batch are to be removed from service and scrapped. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 December 2005","sortOrder":0},{"sectionNumber":"AD/SF340/98","sectionType":"part","heading":"AD/SF340/98","content":"## AD/SF340/98","sortOrder":1},{"sectionNumber":"Main Landing Gear Shock Strut Uplock Axl","sectionType":"part","heading":"Main Landing Gear Shock Strut Uplock Axle","content":"## Main Landing Gear Shock Strut Uplock Axle","sortOrder":2},{"sectionNumber":"2/2006","sectionType":"part","heading":"2/2006","content":"## 2/2006","sortOrder":3}],"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":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety-critical defect in a defined aircraft population. The scope remains precisely limited to the identified batch of uplock axles with hydrogen embrittlement issues."},"complexity_factors":["Single, specific mechanical component addressed (uplock axle)","Clear applicability criteria (specific serial number ranges)","Single compliance action (follow referenced service bulletin)","No defined terms section or interpretation provisions","No conditional logic, exceptions, or nested provisions","Straightforward deadline structure (single date)","Minimal cross-referencing (only to SAAB service bulletin and Swedish CAA AD)"],"plain_english_summary":"CASA requires owners/operators of SAAB SF340A (s/n 004–159) and 340B (s/n 160–459) to remove and scrap the main landing gear shock strut uplock axle per SAAB Service Bulletin 340-32-132 (3 Nov 2005) before 9 May 2006. A cracked axle caused by hydrogen embrittlement was found, indicating a batch manufacturing defect that could lead to gear collapse or failure to deploy. Compliance is mandatory for continued airworthiness."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive retains a narrowly targeted scope: it applies only to specified SAAB SF340 serial numbers and to uplock axles from the implicated batch, requiring their removal and scrapping per the referenced service bulletin. There is no textual expansion of scope beyond those serial numbers or the named part."},"complexity_factors":["Narrow, fleet-specific applicability — explicit serial‑number ranges limiting which aircraft are affected (Applicability).","Mandated physical action: removal and scrapping of all uplock axles produced in the same batch (Background) increases logistical and disposal steps.","Dependence on an external technical document: compliance requires following SAAB Service Bulletin 340‑32‑132 or a later CAA‑approved revision (Requirement).","Firm timeline: an effective date and a fixed compliance deadline create scheduling pressure for operators (Compliance; effective date line).","Regulatory oversight point: later revisions to the service bulletin require CAA approval, introducing administrative discretion and potential delay (Requirement).","Safety cause cited (hydrogen embrittlement) implies immediate operational impact for affected parts and a need for traceability of batch production (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of SAAB SF340A (s/n 004–159) and SF340B (s/n 160–459) to remove and scrap a batch of main landing‑gear shock‑strut uplock axles and to carry out work in SAAB Service Bulletin 340‑32‑132 (3 Nov 2005 or a later CAA‑approved revision). It sets an effective date (16 Feb 2006) and a compliance deadline (before 9 May 2006) after a reported cracked axle caused by hydrogen embrittlement; operators bear the cost and must follow the approved technical instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-98-main-landing-gear-shock-strut-uplock-axle","history":"/api/acts/ad-sf340-98-main-landing-gear-shock-strut-uplock-axle/history","analysis":"/api/acts/ad-sf340-98-main-landing-gear-shock-strut-uplock-axle/analysis","conflicts":"/api/acts/ad-sf340-98-main-landing-gear-shock-strut-uplock-axle/conflicts","importantCases":"/api/acts/ad-sf340-98-main-landing-gear-shock-strut-uplock-axle/important-cases","documents":"/api/acts/ad-sf340-98-main-landing-gear-shock-strut-uplock-axle/documents"}}