{"id":"F2007L00565","name":"AD/DA42/1 - Fuel System - Auxiliary Fuel Tank Venting","slug":"ad-da42-1-fuel-system-auxiliary-fuel-tank-venting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":63896,"registerId":"commonwealth-F2007L00565-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/DA42/1 | Fuel System - Auxiliary Fuel Tank Venting | 4/2007 DM |\n| --------- | ----------------------------------------- | --------- |\n\n| Applicability: | Diamond Aircraft Industries GmbH DA 42 aeroplanes with serial numbers 42.015, 42.028, 42.036, 42.044, 42.055, 42.059, 42.062, 42.067, 42.069, 42.075 up to 42.100 inclusive, 42.105, 42.106, 42.108, 42.114, 42.115, 42.117 up to 42.122 inclusive and 42.124.                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect and modify the auxiliary fuel tank system as detailed in Diamond Aircraft Industries Mandatory Service Bulletin (MSB) 42-032/1 dated 24 January 2007 or later EASA approved revisions.2. Insert into the DA42 Maintenance Manual the AMM-TR-OAM-42-056f Temporary Revision and update the maintenance program to comply with that Temporary Revision.Note: EASA AD 2007-0047 dated 23 February 2007 refers.                                                                                                                                                              |\n| Compliance:    | At the next scheduled inspection but no later 15 April 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 9 March 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | There have been three reported failures of the auxiliary fuel tank venting system. Failure of this system led to the inability to supply the complete auxiliary fuel quantity to the main tanks and the collapse of the auxiliary tank.It is suspected that the vent lines were obstructed by ice accretion under certain climatic conditions or blockage of the vent valves because of fuel contaminants.Undetected failures of the auxiliary fuel tank venting system may lead to lower usable fuel quantities, subsequent fuel starvation and/or fuel spillage into the nacelle. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n28 February 2007","sortOrder":0},{"sectionNumber":"AD/DA42/1","sectionType":"part","heading":"AD/DA42/1","content":"## AD/DA42/1","sortOrder":1},{"sectionNumber":"Fuel System - Auxiliary Fuel Tank Ventin","sectionType":"part","heading":"Fuel System - Auxiliary Fuel Tank Venting","content":"## Fuel System - Auxiliary Fuel Tank Venting","sortOrder":2},{"sectionNumber":"4/2007 DM","sectionType":"part","heading":"4/2007 DM","content":"## 4/2007 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD targets a defined subset of DA42 serial numbers and prescribes specific corrective actions (inspect/modify per MSB, insert temporary maintenance revision, update maintenance program). There is no expansion of applicability beyond those serial numbers or addition of unrelated requirements; the scope aligns with addressing the reported auxiliary tank venting failures and preserving existing airworthiness oversight mechanisms."},"complexity_factors":["Applicability limited to a specific list of serial numbers—operators must check serial numbers against the AD applicability.","Mandatory compliance with an external manufacturer document (MSB 42-032/1) or later EASA-approved revisions, creating dependence on up-to-date revision control.","Requirement to insert a Temporary Revision into the Maintenance Manual and update the maintenance program, adding administrative and record-keeping steps.","Short compliance window (next scheduled inspection but no later than 15 April 2007; AD effective 9 March 2007) may force scheduling and operational disruption.","Technical nature of the inspection/modification of fuel venting hardware may require parts, specialised maintenance labour and possible downtime.","Cross-reference to EASA AD 2007-0047 increases regulatory linkage and potential for subsequent changes via foreign authority revisions."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of the listed Diamond DA42 serial-numbered aeroplanes to inspect and modify the auxiliary fuel tank venting system following Diamond MSB 42-032/1 (or later EASA-approved revisions). It also requires inserting a temporary revision into the DA42 Maintenance Manual and updating the maintenance program. The work must occur at the next scheduled inspection but no later than 15 April 2007 (AD effective 9 March 2007) to address reported venting failures that can reduce usable fuel, cause tank collapse, fuel starvation or nacelle spillage."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety defect in a specific aircraft type. The scope remains precisely limited to the identified fuel venting issue and the affected serial numbers. No scope creep is evident."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 substantive requirements (inspection/modification + manual update)","Single applicability table with explicit serial number list","No defined terms section","No cross-references to other legislation (only references to manufacturer service bulletin and EASA AD)","Simple conditional logic: 'if your serial number is in this list, comply by this date'","Clear, single compliance deadline with no exceptions or alternative methods"],"plain_english_summary":"Owners/operators of certain Diamond DA42 twin‑engine aeroplanes must inspect and modify the auxiliary fuel tank venting system to remove a blockage risk that has caused tank collapse, fuel starvation, and fuel ingress into nacelles. Affected aircraft are specific serial numbers listed in the AD; the work and a maintenance manual update must be done by the next inspection or by 15 April 2007. This is an urgent safety order to prevent engine failure or fire."},"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-da42-1-fuel-system-auxiliary-fuel-tank-venting","history":"/api/acts/ad-da42-1-fuel-system-auxiliary-fuel-tank-venting/history","analysis":"/api/acts/ad-da42-1-fuel-system-auxiliary-fuel-tank-venting/analysis","conflicts":"/api/acts/ad-da42-1-fuel-system-auxiliary-fuel-tank-venting/conflicts","importantCases":"/api/acts/ad-da42-1-fuel-system-auxiliary-fuel-tank-venting/important-cases","documents":"/api/acts/ad-da42-1-fuel-system-auxiliary-fuel-tank-venting/documents"}}