{"id":"F2008L02506","name":"AD/ATR 42/24 - Flaps - 45 Degree Configuration","slug":"ad-atr-42-24-flaps-45-degree-configuration","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74467,"registerId":"commonwealth-F2008L02506-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Avions de Transport Regional ATR 42 Seri","sectionType":"division","heading":"Avions de Transport Regional ATR 42 Series Aeroplanes","content":"### Avions de Transport Regional ATR 42 Series Aeroplanes\n\n| AD/ATR 42/24 | Flaps - 45 Degree Configuration | 9/2008 DM |\n| ------------ | ------------------------------- | --------- |\n\n| Applicability: | ATR - GIE Avions de Transport Régional ATR 42-200, 42-300 and 42-320 aircraft. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. For all Aircraft - Revise the Limitations and Performance Sections of the EASA-approved ATR42-200/300/320 Aircraft Flight Manual (AFM) to include the ATR 42 AFM Temporary Revision (TR) No.51 and delete pages concerning Mod 01314.By means of this TR No. 51, the 45° flaps configuration can only be used for emergency operations by decision of the captain provided that icing conditions have not been encountered during the flight and the aircraft is clear of ice.Note 1: When changes introduced by TR No.51 have been incorporated into the Normal EASA-approved revisions of the AFM, the Normal revisions may be inserted into the AFM, provided that the information contained in the Normal revisions is identical to that specified in TR No.51Note 2: The new Appendix 20 “Landing with Flaps 45°” provided by AFM TR No.51 does NOT constitute any airworthiness approval to conduct Normal Operations with Flaps at 45º but is only ATR guidance and recommended information to be used in case any individual operational exemption is granted by a National Aviation Authority (NAA) for using of the 45º Flaps setting on specific airfields where no icing conditions may be encountered and the aircraft is clear of ice.2. For all ATR 42-200, 42-300 and 42-320 aircraft Pre Mod. 01192 or which have NOT embodied SB ATR42-27-0008 at any revision, in service - Unless previously accomplished, restrict the maximum permissible flaps extension in normal operations to 30° and install new speed limits placards as instructed in the accomplishment instructions of SB ATR42-27-0008 Revision 6 or later EASA approved revision and after embodiment, send the accomplishment report back to ATR. |\n\n| | 3. For ATR 42 with manufacturing serial numbers (MSN) 027,102, 106 and 214, and modified per SB ATR42-27-0080 - Unless accomplished previously, undo changes introduced by SB ATR42-27-0080 and restrict the maximum permissible flaps extension in normal operations to 30° and install new speed limits placards as instructed in the accomplishment instructions of SB ATR42-27-0099 original issue or later EASA approved revision and after embodiment, send the accomplishment report back to ATR.4. For ATR 42 MSN 097, if not previously modified per SB ATR42-27-0008 at any revision - Modify the aircraft per the instructions of SB ATR42-27-0099 original issue or later EASA approved revision.5. For ATR 42 MSN 403 - Modify the aircraft per the instructions of SB ATR42-27-0099 original issue or later EASA approved revision.6. For all other ATR 42 not addressed by Requirements 2, 3, 4 & 5 of this AD - Check that the red colour mechanical stop is installed on flaps control and that the following statement is written on the speed limits placard concerning the VFE limitations:“EMER: (45°). 130 kt”.If any discrepancy is found, contact ATR to obtain the procedure in order to restore the aircraft to the approved configuration and implement the procedure accordingly.7. Do not install ATR Mod. 01314 or implement SB ATR42-27-0080 on any aeroplane.Note 3: EASA AD 2008-0124 dated 4 July 2008 refers. The EASA AD supersedes Direction Générale de l'Aviation Civile (DGAC) France AD F-1986-130-003.Note 4: DGAC AD F-1986-130-003 is listed in Table 1 of AD/ATR 42/1, “State of Design Airworthiness Directives”. AD/ATR 42/1 requires the operator to determine the applicability of each of the ADs listed in Table 1. As AD F-1986-130-003 has been superseded by EASA AD 2008-0124, F-1986-130-003 should be considered as no longer being applicable. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | For Requirement 1 - Within 7 days after the effective date of this AD.For Requirements 2, 3, 4, 5 and 6 - Within 6 months after the effective date of this AD.For Requirement 7 - After the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 16 July 2008. |\n\n| Background: | DGAC AD F-1986-130-003 was issued following an incident during a training flight when a temporary loss of the aircraft pitch control occurred due to a suspected tailplane stall that would have been caused by the conjunction of ice accretion on tail surface, flaps extension at 45° and airplane by the approach speed.Revision 1 of AD F-1986-130-003, in April 1997, prohibited the use of flaps at the 45° configuration, except for emergency situations, and mandated the installation of a mechanical stop along with new markings through ATR modification (Mod) 01192 (ATR Service Bulletin (SB) ATR 42-27-0008). However the DGAC AD let the possibility for some operators to request an operational exemption, based on the aircraft operating network, granted by their National Aviation Authority. For these specific cases, the mechanical stop could be removed and the markings modified, in accordance with Mod 01314 (SB ATR42-27-0080).These days, with second-hand aircraft movements worldwide, it is likely that some aircraft which were previously granted with an operational exemption can be currently operated without the flaps 45° limitation in geographic locations where the use of the 45° configuration may represent an unsafe condition.This AD mandates AFM TR No.51 of the AFM with modification of the aircraft so as to restrict the maximum flaps extension to 30°. These actions are intended to prevent an uncontrollable nose pitch-down at low altitude resulting from a tail plane stall caused by ice accretions on tail surfaces in conjunction with full flaps down at 45° and the aircraft at approach speeds. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n10 July 2008","sortOrder":0},{"sectionNumber":"AD/ATR 42/24","sectionType":"part","heading":"AD/ATR 42/24","content":"## AD/ATR 42/24","sortOrder":1},{"sectionNumber":"Flaps - 45 Degree Configuration","sectionType":"part","heading":"Flaps - 45 Degree Configuration","content":"## Flaps - 45 Degree Configuration","sortOrder":2},{"sectionNumber":"9/2008 DM","sectionType":"part","heading":"9/2008 DM","content":"## 9/2008 DM","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This AD maintains its original scope as a safety-critical airworthiness directive addressing the specific hazard of tailplane stall in icing conditions with 45° flaps. The multiple requirements for different aircraft configurations reflect necessary technical granularity rather than scope creep — the core purpose (restricting 45° flap use to emergencies) remains consistent across all variants."},"complexity_factors":["Seven distinct requirements applying to different subsets of aircraft based on manufacturing serial numbers (MSNs) and modification status","Extensive cross-referencing to external documents: EASA-approved Aircraft Flight Manual (AFM), Temporary Revision (TR) No.51, multiple Service Bulletins (SB ATR42-27-0008, SB ATR42-27-0080, SB ATR42-27-0099), and EASA AD 2008-0124","Nested conditional logic: Requirements 2-6 each apply to specific aircraft configurations (Pre Mod. 01192, post-SB embodiment, specific MSNs, etc.)","Dual regulatory framework references: Australian AD implementing/superseding French DGAC AD and EASA AD","Technical aviation terminology requiring domain knowledge (MSN, Mod, SB, AFM, TR, VFE, tailplane stall)","Multiple compliance deadlines varying by requirement (7 days vs 6 months vs ongoing)","Exception-within-exception structure: Emergency use permitted despite general prohibition, but only under specific conditions (no icing, captain's decision)"],"plain_english_summary":"This AD orders ATR 42-200/300/320 operators to prohibit routine use of 45° flaps—allowing them only in emergencies when no ice is present—update flight manuals accordingly, and modify most aircraft (mechanical stops and placards) while banning Mod 01314. \n\nIt responds to a tailplane-stall risk from ice-induced aerodynamic upset that can cause sudden, uncontrollable nose-down pitch on approach, and affects operators and maintenance organisations servicing relevant ATR 42s in Australia."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Compared with earlier DGAC practice that allowed case-by-case operational exemptions (and Mod 01314 to remove the mechanical stop), this AD tightens scope by mandating AFM limits, reinstating or requiring mechanical stops/placards and forbidding Mod 01314/SB ATR42-27-0080 (see Requirements 1, 2, 3 and 7). It therefore restricts normal use of 45° flaps fleet-wide except narrowly for captain-declared emergencies where no icing has been encountered."},"complexity_factors":["Multiple applicability classes: whole fleet plus specific MSNs (027, 097, 102, 106, 214, 403) with different actions required (Requirement 2–5).","Cross-references to technical material: AFM TR No.51, SB ATR42-27-0008 Revision 6, SB ATR42-27-0099, and prohibitions on Mod 01314/SB ATR42-27-0080.","Different compliance timelines: AFM change within 7 days; physical modifications/placards and checks within 6 months; prohibition effective immediately.","Mixed action types: procedural change (AFM revision), hardware installation (mechanical stop/placards), undoing prior modifications, and mandatory modification embodied reporting to ATR.","Operational conditionality: 45° flap allowed only for emergency by captain and only if no icing encountered (creates operational judgement calls).","Reporting and post-modification paperwork: requirement to send accomplishment reports to ATR after embodiment.","Interaction with prior national ADs and EASA AD 2008-0124, requiring operators to reconcile historical exemptions and second-hand aircraft histories."],"plain_english_summary":"This Airworthiness Directive forces operators of ATR 42-200/300/320 aeroplanes to change their Aircraft Flight Manual (insert AFM Temporary Revision No.51) so the 45° flap setting is permitted only for captain-declared emergency use (and only if no icing has been encountered). It also requires physical changes or placards to limit normal flap use to 30° on specified serial-numbered aircraft and cancels previously allowed modifications that removed the 45° restriction. Operators bear the cost and must report compliance within set deadlines."}},"importantCases":[],"_links":{"self":"/api/acts/ad-atr-42-24-flaps-45-degree-configuration","history":"/api/acts/ad-atr-42-24-flaps-45-degree-configuration/history","analysis":"/api/acts/ad-atr-42-24-flaps-45-degree-configuration/analysis","conflicts":"/api/acts/ad-atr-42-24-flaps-45-degree-configuration/conflicts","importantCases":"/api/acts/ad-atr-42-24-flaps-45-degree-configuration/important-cases","documents":"/api/acts/ad-atr-42-24-flaps-45-degree-configuration/documents"}}