{"id":"F2009L03661","name":"AD/GAF-N22/69 Amdt 6 - Ailerons","slug":"ad-gaf-n22-69-amdt-6-ailerons","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141494,"registerId":"commonwealth-F2009L03661-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"GAF N22 and N24 Series Aeroplanes","sectionType":"division","heading":"GAF N22 and N24 Series Aeroplanes","content":"### GAF N22 and N24 Series Aeroplanes\n\n| AD/GAF-N22/69 Amdt 6 | Ailerons | 11/2009 |\n| -------------------- | -------- | ------- |\n\n| Applicability: | All Model N22 and N24 Series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Action in accordance with ASTA Nomad Alert Service Bulletin ANMD-57-18 Issue 1 dated 14 August 2006.2. Incorporate ASTA Nomad Alert Service Bulletin ANMD-27-53 dated20 February 2008.Incorporation of ANMD-27-53 dated 20 February 2008 cancels the limitations imposed by Alert Service Bulletin ANMD-57-18, and is terminating action for this Airworthiness Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Compliance:    | Requirement 1: Within 50 hours time in service after 26 October 2006 or before26 November 2006, whichever occurs first.Requirement 2: Before 30 June 2010.The compliance time for Requirement 1 remains unchanged from the previous Amendment of this Airworthiness Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | This Amendment becomes effective on 22 October 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | Late in 2002 the manufacturer advised CASA of another Nomad accident which was possibly caused by aileron flutter with the flaps at 38 degrees. This, along with the other flutter incidents, has resulted in the manufacturer issuing ANMD-57-18 Issue 1 as a precautionary measure while they further investigate the issue.The manufacturer has now completed their investigation and issued Alert Service Bulletin ANMD-27-53 to modify flap actuation linkages to restore the necessary rigidity to the outboard flap, and hence the aileron. The unacceptable flexibility of the outboard flap mechanism allows flutter to occur in extreme circumstances.This amendment mandates Alert Service Bulletin ANMD-27-53, which requires modifications to the aircraft, but terminates the limitations imposed by earlier amendments. |\n\n|     | The initial issue of this AD imposed weight and speed restrictions in the flaps extended configuration, and prohibited the use of 38 degrees flap.Amendments 1 and 2 progressively eased these restrictions as the investigation progressed.Amendment 4 of this Airworthiness Directive became effective on 12 March 2003.Amendment 5 mandated Alert Service Bulletin ANMD-57-18 issue 1 dated14 August 2006.The original issue of this Airworthiness Directive became effective on20 September 1994. |\n| --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n10 September 2009","sortOrder":0},{"sectionNumber":"AD/GAF-N22/69 Amdt 6","sectionType":"part","heading":"AD/GAF-N22/69 Amdt 6","content":"## AD/GAF-N22/69 Amdt 6","sortOrder":1},{"sectionNumber":"Ailerons","sectionType":"part","heading":"Ailerons","content":"## Ailerons","sortOrder":2},{"sectionNumber":"11/2009","sectionType":"part","heading":"11/2009","content":"## 11/2009","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":3,"scope_assessment":{"changed":false,"description":"The legislation maintains its original scope — ensuring airworthiness of GAF N22/N24 aileron systems. While the directive has evolved through six amendments over 15 years (progressively moving from temporary flight restrictions to permanent modifications), each amendment has remained tightly focused on the same safety issue. The current version terminates earlier restrictions rather than expanding into new regulatory areas."},"complexity_factors":["Short, single-purpose document (2 substantive requirements)","Minimal defined terms (only standard aviation terminology like 'time in service')","Clear sequential compliance dates with explicit deadlines","No nested conditional logic — requirements are straightforward 'do X by Y date'","Heavy reliance on external documents (Service Bulletins) without reproducing their content","Historical context requires reading background section to understand amendment lineage, but does not affect current compliance obligations"],"plain_english_summary":"This AD requires owners/operators of GAF N22 and N24 Nomad aircraft to carry out mandated aileron/flap modifications to eliminate dangerous aileron flutter caused by flexible outboard flaps. It directs compliance with manufacturer bulletins (ANMD-57-18 and the permanent fix ANMD-27-53) with the permanent modification required by 30 June 2010.\n\nIt affects all operators of these twin‑turboprops and restores unrestricted operations after long‑standing safety limits imposed since 1994."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Scope shifted from imposing temporary operational restrictions (weight/speed limits and prohibition of 38° flap) to mandating a hardware modification that, once done, terminates those prior limitations. The amendment replaces interim operational limits with a specified engineering fix as terminating action (Background; Requirement 2)."},"complexity_factors":["Applicability to all N22/N24 models — broad fleet coverage increases operational impact (Applicability).","Two-stage compliance: interim action (ANMD‑57‑18) and a terminating modification (ANMD‑27‑53) with separate deadlines (Requirement 1; Requirement 2; Compliance).","Technical nature of the required modification (flap actuation linkage rigidity) means work must be done to manufacturer alert service bulletin standards (Requirement 2; Background).","Removal of prior operational limits once modification is incorporated creates sequencing and scheduling pressure for operators (Requirement 2; Background).","Fixed compliance deadlines and an effective date create potential short-term grounding or operational restrictions if work is not scheduled (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of all GAF N22/N24 aeroplanes to modify the flap actuation linkages to restore outboard flap rigidity (ASTA Nomad Alert Service Bulletin ANMD‑27‑53) and to follow interim measures in ANMD‑57‑18 until that modification is done. It affects aircraft owners/operators, who must pay for and arrange the work within set timeframes (Requirement 1 and Requirement 2). CASA enforces compliance; the mandatory modification replaces earlier operational limits on flap use (Background; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-69-amdt-6-ailerons","history":"/api/acts/ad-gaf-n22-69-amdt-6-ailerons/history","analysis":"/api/acts/ad-gaf-n22-69-amdt-6-ailerons/analysis","conflicts":"/api/acts/ad-gaf-n22-69-amdt-6-ailerons/conflicts","importantCases":"/api/acts/ad-gaf-n22-69-amdt-6-ailerons/important-cases","documents":"/api/acts/ad-gaf-n22-69-amdt-6-ailerons/documents"}}