{"id":"F2008L02735","name":"AD/DA42/6 - Aircraft Flight Manual - Lightning Strike Procedures","slug":"ad-da42-6-aircraft-flight-manual-lightning-strike-procedures","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74823,"registerId":"commonwealth-F2008L02735-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Diamond DA42 Series Aeroplanes","sectionType":"division","heading":"Diamond DA42 Series Aeroplanes","content":"### Diamond DA42 Series Aeroplanes\n\n| AD/DA42/6 | Aircraft Flight Manual - LightningStrike Procedures | 10/2008 DM |\n| --------- | --------------------------------------------------- | ---------- |\n\n| Applicability: | DA 42 and DA 42 M aircraft, all serial numbers. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | Unless previously accomplished, amend the applicable Aircraft Flight Manual (AFM) to incorporate the new lightning strike procedure in accordance with the instructions contained in Diamond Aircraft Industries (DAI) Temporary RevisionTR-MÄM-42-270 dated 31 May 2008. |\n| | TR-MÄM-42-270 may be removed from the AFM when the AFM is amended by a normal revision which includes or supersedes the TR-MÄM-42-270 lightning strike procedure. |\n| | Note 1: After any lightning strike, the aircraft should be inspected in accordance with the DA 42 Aircraft Maintenance Manual, Chapter 05-50, paragraph 5.D. |\n| | Note 2: EASA AD 2008-0136 refers. |\n| Compliance: | Within 30 days after the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 8 August 2008. |\n| Background: | Diamond DA 42 and DA 42 M aircraft are prohibited from intentional flights into known thunderstorms. The AFM Section 2.13 already specifies that “Flights into known thunderstorms are prohibited\". Nevertheless, some aircraft recently experienced lightning strikes of unusual high levels over the design requirement with various resulting damage. The analyses of these incidents have identified structural damage that may not be visible to the pilot.This condition, if not corrected, may lead to loss of control, or additional damage, even if the aircraft is subsequently operated within the allowed flight envelope. To address this risk, DAI has developed additional AFM procedures to be applied in case of lightning strike, including an airspeed limitation and certain procedures to avoid additional loads to the structure. |\n\n| | For these reasons, this Directive requires the amendment of the applicable AFM to incorporate the new lightning strike procedure. |\n| --- | --------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n24 July 2008","sortOrder":0},{"sectionNumber":"AD/DA42/6","sectionType":"part","heading":"AD/DA42/6","content":"## AD/DA42/6","sortOrder":1},{"sectionNumber":"Aircraft Flight Manual - LightningStrike","sectionType":"part","heading":"Aircraft Flight Manual - LightningStrike Procedures","content":"## Aircraft Flight Manual - Lightning \nStrike Procedures","sortOrder":2},{"sectionNumber":"10/2008 DM","sectionType":"part","heading":"10/2008 DM","content":"## 10/2008 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive does not change which aircraft are covered or the existing prohibition on intentional flight into known thunderstorms. It adds mandatory AFM procedures and post‑strike inspection steps for the same DA42/DA42 M fleet (Applicability; Background; Requirement; Note 1), but does not expand operational scope beyond those aircraft or alter existing flight prohibitions."},"complexity_factors":["Broad applicability to all DA42 and DA42 M serial numbers — affects entire fleet (Applicability).","Mandatory AFM amendment to incorporate an external Temporary Revision (TR‑MÄM‑42‑270) — procedural dependence on an external document (Requirement).","Short compliance deadline of 30 days from effective date — tight implementation timetable for operators (Compliance).","Provision allowing removal of the TR only when a normal AFM revision supersedes it — requires coordination with AFM revision cycles (Requirement).","Post‑strike inspection requirement referencing the DA42 Aircraft Maintenance Manual (Chapter 05‑50, para 5.D) — imposes maintenance inspection actions and associated costs (Note 1).","Reference to EASA AD 2008‑0136 — alignment with external regulator documents may require cross‑referencing and administrative tracking (Note 2 / Background).","Does not reproduce procedural detail in the AD itself (the TR contains airspeed and manoeuvre limits) — operators must obtain and integrate the TR text into AFMs (Requirement)."],"plain_english_summary":"Requires owners/operators of all Diamond DA42 and DA42 M aeroplanes to amend their Aircraft Flight Manual within 30 days to incorporate Diamond Aircraft’s temporary lightning‑strike procedure (TR‑MÄM‑42‑270). It also directs post‑strike inspections per the DA42 Maintenance Manual. The Civil Aviation Safety Authority mandated the change; the compliance cost and maintenance actions fall on operators and maintenance organisations. Mechanically, the AFM addition prescribes an airspeed limit and load‑avoidance steps to manage risk from lightning strikes and potential hidden structural damage."},"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 AD maintains its original narrow scope: mandating a specific flight manual amendment for lightning strike procedures on a particular aircraft type. There is no evidence of scope creep."},"complexity_factors":["Single, specific requirement: insert one temporary revision into the Aircraft Flight Manual","Only one defined term of note (AFM - Aircraft Flight Manual)","No nested exceptions or conditional logic — straightforward compliance deadline","Clear applicability (two specific aircraft models, all serial numbers)","Background explanation is narrative and accessible, not technical regulatory cross-referencing","Single cross-reference to EASA AD 2008-0136 (informational only)"],"plain_english_summary":"Owners and operators of Diamond DA42 twin‑engine aircraft must insert a temporary Aircraft Flight Manual revision (TR‑MÄM‑42‑270) within 30 days of 8 August 2008 adding new lightning‑strike emergency procedures, including airspeed limits and steps to reduce structural stress. This mandatory AD responds to unexpected, severe lightning damage that can be hidden from pilots and prevents further control loss or structural failure until a permanent AFM update is issued."}},"importantCases":[],"_links":{"self":"/api/acts/ad-da42-6-aircraft-flight-manual-lightning-strike-procedures","history":"/api/acts/ad-da42-6-aircraft-flight-manual-lightning-strike-procedures/history","analysis":"/api/acts/ad-da42-6-aircraft-flight-manual-lightning-strike-procedures/analysis","conflicts":"/api/acts/ad-da42-6-aircraft-flight-manual-lightning-strike-procedures/conflicts","importantCases":"/api/acts/ad-da42-6-aircraft-flight-manual-lightning-strike-procedures/important-cases","documents":"/api/acts/ad-da42-6-aircraft-flight-manual-lightning-strike-procedures/documents"}}