{"id":"F2009L00276","name":"AD/DA40/6 Amdt 1 - Nose Landing Gear Leg","slug":"ad-da40-6-amdt-1-nose-landing-gear-leg","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76812,"registerId":"commonwealth-F2009L00276-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/DA40/6 Amdt 1 | Nose Landing Gear Leg | 4/2009 DM |\n| ---------------- | --------------------- | --------- |\n\n| Applicability: | Model DA 40, DA 40 D, and DA 40 F aircraft, all serial numbers; except aircraft with a nose landing gear leg part number D41-3223-10-00_1 or higher (_2, _3, etc.) installed. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | Inspect the nose landing gear leg in accordance with the instructions of Diamond Aircraft Industries GmbH MSB40-046 / MSBD4-046 original issue, or later EASA approved revision.If cracks are detected during any inspection required by this Directive, before further flight, replace the nose landing gear leg with a serviceable unit in accordance with the instructions of Diamond Aircraft Industries GmbH MSB40-046 / MSBD4-046 original issue, or later EASA approved revision.Inspections and corrective actions accomplished prior to the effective date of this Directive in accordance with the Requirement document at original issue or issue 2, are considered in compliance with the initial requirements of this Directive. After the effective date of this Directive repetitive inspections and corrective actions must be accomplished in accordance with Diamond Aircraft Industries GmbH MSB40-046 / MSBD4-046 at issue 3.After the optional modification of an aircraft by installing a nose landing gear leg part number D41-3223-10-00_1 or higher (_2, _3, etc.), no person shall install a nose landing gear leg part number D41-3223-10-00 on that aircraft.Note 1: After installation on an aircraft of a nose landing gear leg part numberD41-3223-10-00_1 or higher (_2, _3, etc.), the repetitive inspections are no longer required for that aircraft.Note 2: EASA AD 2009-0016 refers. |\n| Compliance: | For aircraft that are predominantly (more than 50% of the time) operated from unsealed runways, inspect:Within 25 flight hours after 1 December 2005 or before 31 December 2005, whichever occurs first; and thereafter at intervals not to exceed 100 flight hours. |\n\n| | For aircraft that are predominantly (more than 50% of the time) operated from sealed runways, inspect:Within 100 flight hours after 1 December 2005, and thereafter at intervals not to exceed 200 flight hours.The compliance times remain unchanged by this issue of the Directive. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Amendment becomes effective on 12 March 2009. |\n| Background: | A report was received of nose landing gear failure in the area of the nose gear leg pivot axle. Investigation revealed a fatigue crack had initiated in the pivot axle. The aircraft involved was used in training and mostly operated on grass runways.Amendment 1 is issued in response to a new EASA AD, which excludes aircraft from applicability that have the improved redesigned nose landing gear leg installed. |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n3 February 2009","sortOrder":0},{"sectionNumber":"AD/DA40/6 Amdt 1","sectionType":"part","heading":"AD/DA40/6 Amdt 1","content":"## AD/DA40/6 Amdt 1","sortOrder":1},{"sectionNumber":"Nose Landing Gear Leg","sectionType":"part","heading":"Nose Landing Gear Leg","content":"## Nose Landing Gear Leg","sortOrder":2},{"sectionNumber":"4/2009 DM","sectionType":"part","heading":"4/2009 DM","content":"## 4/2009 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Amendment 1 narrows applicability by excluding aircraft that have the redesigned nose landing gear leg (part number D41-3223-10-00_1 or higher) installed. After that modification, repetitive inspections are no longer required for that aircraft, and installing the older part number on a modified aircraft is prohibited. The amendment therefore reduces the population subject to ongoing inspection obligations and adds a retrofit-based termination of inspection requirements."},"complexity_factors":["Multiple referenced maintenance documents and revisions (Diamond MSB40-046 original issue and later EASA‑approved revisions) introduce versioning complexity.","Different inspection intervals depending on operational profile (predominantly unsealed vs predominantly sealed runway use) and short initial compliance windows (see Compliance).","Applicability exclusions tied to specific part-numbered retrofit parts (D41-3223-10-00_1 or higher) require tracking part histories/serials.","Post‑modification rule: once improved part installed, repetitive inspections are no longer required and re‑installation of the older part is prohibited — creates inventory and configuration-control issues.","Transitional compliance allowance for inspections done to earlier MSB issue versions requires cross-checking historical maintenance records.","Cross-reference to EASA AD 2009-0016 adds an external regulatory dependency to interpret requirements consistently.","Requirement to ground/replace before further flight if cracks found imposes immediate operational disruption and potential replacement sourcing delays."],"plain_english_summary":"This airworthiness directive requires owners/operators of Diamond DA40, DA40 D and DA40 F aeroplanes to inspect the nose landing gear leg for cracks using Diamond Aircraft MSB40-046 (or later EASA-approved revisions) and to replace any cracked leg before further flight. Inspection intervals differ by whether the aeroplane is mostly operated from sealed or unsealed runways. Operators pay for inspections and replacements; certified maintenance organisations carry out the work and record compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment narrows the scope slightly by excluding aircraft with improved landing gear parts, but remains tightly focused on its original purpose: preventing nose landing gear failures due to fatigue cracks. No scope creep detected."},"complexity_factors":["Short, single-purpose directive focused on one mechanical component","Only 4 defined applicability categories (3 models plus serial number exception)","Two-tier compliance structure based on runway type (sealed vs unsealed)","Cross-reference to external manufacturer documents (MSB40-046 / MSBD4-046) for actual inspection procedures — the AD itself doesn't contain the technical details","Simple conditional logic: if cracks found → replace; if upgraded part installed → inspections no longer required","No nested exceptions or complex definitional sections"],"plain_english_summary":"This mandatory AD requires owners/operators of certain Diamond DA40 aircraft to inspect the nose landing gear for fatigue cracks and replace any cracked gear before further flight. It sets tighter inspection intervals for aircraft that primarily operate from grass/unsealed runways versus sealed runways.\n\nIt affects DA40s that do not have the improved redesigned nose gear; aircraft fitted with the upgraded part are exempt. The AD addresses a discovered pivot-axle fatigue risk that could lead to landing-gear failure."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-da40-6-amdt-1-nose-landing-gear-leg","history":"/api/acts/ad-da40-6-amdt-1-nose-landing-gear-leg/history","analysis":"/api/acts/ad-da40-6-amdt-1-nose-landing-gear-leg/analysis","conflicts":"/api/acts/ad-da40-6-amdt-1-nose-landing-gear-leg/conflicts","importantCases":"/api/acts/ad-da40-6-amdt-1-nose-landing-gear-leg/important-cases","documents":"/api/acts/ad-da40-6-amdt-1-nose-landing-gear-leg/documents"}}