{"id":"F2006L01336","name":"AD/DA40/4 Amdt 1 - Fuel Valve Universal Joints","slug":"ad-da40-4-amdt-1-fuel-valve-universal-joints","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58846,"registerId":"commonwealth-F2006L01336-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Diamond DA40 Series Aeroplanes","sectionType":"division","heading":"Diamond DA40 Series Aeroplanes","content":"### Diamond DA40 Series Aeroplanes\n\n| AD/DA40/4 Amdt 1 | Fuel Valve Universal Joints | 6/2006 |\n| ---------------- | --------------------------- | ------ |\n\n| Applicability: | Diamond Aircraft Industries DA40 aircraft serial numbers 40.006 though 40.079 inclusive, 40.081 through 40.083 inclusive, 40.201 through 40.417 inclusive, with fuel shaft Part No. D41-2823-20-00 pre Rev “a” installed.Note 1: The inspection requirements of this AD only apply to pre Revision “a” fuel shafts.                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Carry out an inspection of the universal joints of the fuel selector/fuel valve assembly in accordance with Diamond Aircraft Industries GmbH Mandatory Service Bulletin No. MSB 40-030/3 or later approved revisions.2. If defects are found during the inspection detailed in Requirement 1 of this Directive replace the complete drive assembly with new joint Part No.D41-2823-20-00 Rev “a” or higher in accordance with Diamond Aircraft Industries GmbH Mandatory Service Bulletin No. MSB 40-030/3 or later approved revisions.Replacement of the shaft with a Rev “a” or later joint provides terminating action for the requirements of this AD.Note 2: EASA AD 2006-0067 which supersedes Austrian Airworthiness DirectiveNo. A-2004-003 refers. |\n| Compliance:    | For aeroplanes with a time-since-new (TSN) of more than 200 flight hrs:For Requirement 1: Initial inspection within 15 hours after the effective date of this AD, unless previously accomplished; thereafter at intervals not to exceed 50 hours time in service (TIS).For Requirement 2: Prior to further flight.For aeroplanes with a TSN of 200 flight hours or less:For Requirement 1: At the next scheduled inspection but not to exceed 50 hours TIS after the effective date of this AD; thereafter at intervals not to exceed 50 hours TIS.For Requirement 2: Prior to further flight.                                                                                                                                                                 |\n\n|             | This Amendment becomes effective on 8 June 2006.                                                                                                                                                                                                                                                                                                                                       |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | Abnormal manufacturing variations of the universal joints in combination with mechanical wear can lead to universal joint failures and subsequent disconnection between the fuel selector and the fuel valve. This condition might remain unrecognized by the pilot and can result in fuel starvation during flight and/or the unavailability of the emergency fuel shut-off function. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n28 April 2006","sortOrder":0},{"sectionNumber":"AD/DA40/4 Amdt 1","sectionType":"part","heading":"AD/DA40/4 Amdt 1","content":"## AD/DA40/4 Amdt 1","sortOrder":1},{"sectionNumber":"Fuel Valve Universal Joints","sectionType":"part","heading":"Fuel Valve Universal Joints","content":"## Fuel Valve Universal Joints","sortOrder":2},{"sectionNumber":"6/2006","sectionType":"part","heading":"6/2006","content":"## 6/2006","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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This instrument (Amendment 1) explicitly limits application to DA40 aircraft fitted with fuel shaft Part No. D41-2823-20-00 pre‑Rev “a” and prescribes inspection schedules and a replacement that provides terminating action. The amendment therefore clarifies and confines the AD's operational scope to pre‑Rev “a” shafts and specifies short, recurring inspection intervals (initial within 15 hours for TSN>200; thereafter every 50 hours, with alternate timing for TSN≤200). The text itself does not set out the prior AD's original wording, but this amendment establishes the stated applicability and timelines."},"complexity_factors":["Narrow technical applicability defined by multiple serial‑number ranges and a specific part number plus a revision cutoff (Applicability).","Mandatory inspection standard references an external document: Diamond MSB 40‑030/3 (Requirement 1), creating regulatory dependence on that service bulletin and any later approved revisions.","Replacement as terminating action requires fitment of a part at Rev “a” or later (Requirement 2), tying compliance to parts availability and maintenance capability.","Different compliance timelines based on time‑since‑new (TSN) (>200 hrs vs ≤200 hrs) with short initial windows (15 hours for older TSN) and recurring 50‑hour intervals (Compliance).","Replacement required 'prior to further flight' if defects are found, which may cause immediate aircraft downtime and operational disruption (Requirement 2; Compliance).","The AD cross‑references other regulatory instruments (EASA AD 2006‑0067 and Austrian AD A‑2004‑003), adding regulatory coordination to implementation (Note 2).","Phrase 'or later approved revisions' introduces administrative discretion about which revisions of the MSB are acceptable, creating potential compliance uncertainty (Requirement 1 and 2)."],"plain_english_summary":"This airworthiness directive requires inspections of the fuel-selector/fuel-valve universal joints on specified Diamond DA40 aeroplanes that have fuel shaft Part No. D41-2823-20-00 pre‑Revision “a”. Inspections must follow Diamond MSB 40-030/3 and any defective drive assemblies must be replaced with Part No. D41-2823-20-00 Rev “a” or later, which ends the directive’s obligations. \n\nIt affects owners/operators of the listed DA40 serial numbers, who must schedule inspections and bear replacement costs to reduce the risk of selector‑valve disconnection and possible in‑flight fuel starvation."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) to an existing Airworthiness Directive, but it appears to maintain the original scope — addressing fuel valve universal joint failures in specific Diamond DA40 aircraft. The amendment likely clarifies or adjusts compliance times rather than expanding the safety issue addressed."},"complexity_factors":["Short, single-purpose document (1 page)","Only 2 substantive requirements (inspect and replace)","Clear conditional logic based on aircraft flight hours (TSN threshold of 200 hours)","Limited applicability (specific serial number ranges and part numbers)","Cross-reference to only one external document (Diamond Aircraft service bulletin MSB 40-030/3)","Simple compliance timeline with two distinct pathways","No nested exceptions or complex defined terms"],"plain_english_summary":"This AD orders owners of certain Diamond DA40s with a specific fuel valve control shaft to inspect and, if needed, replace the fuel selector universal joints because manufacturing defects/wear can make the selector knob turn without moving the valve. Failure can cause fuel starvation or loss of the emergency shut‑off. Inspections are required every 50 flight hours, with early deadlines for higher‑time aircraft, and defective shafts must be replaced with Rev “a” (or later)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-da40-4-amdt-1-fuel-valve-universal-joints","history":"/api/acts/ad-da40-4-amdt-1-fuel-valve-universal-joints/history","analysis":"/api/acts/ad-da40-4-amdt-1-fuel-valve-universal-joints/analysis","conflicts":"/api/acts/ad-da40-4-amdt-1-fuel-valve-universal-joints/conflicts","importantCases":"/api/acts/ad-da40-4-amdt-1-fuel-valve-universal-joints/important-cases","documents":"/api/acts/ad-da40-4-amdt-1-fuel-valve-universal-joints/documents"}}