{"id":"F2006L00131","name":"AD/BAe 146/52 Amdt 3 - Fuselage Frame 29","slug":"ad-bae-146-52-amdt-3-fuselage-frame-29","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58011,"registerId":"commonwealth-F2006L00131-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 146 Series Aeropla","sectionType":"division","heading":"British Aerospace BAe 146 Series Aeroplanes","content":"### British Aerospace BAe 146 Series Aeroplanes\n\n| AD/BAe 146/52 Amdt 3 | Fuselage Frame 29 | 2/2006 |\n| -------------------- | ----------------- | ------ |\n\n| Applicability: | All Model BAe 146 Series aircraft;All BAe 146 RJ70 and RJ85 Series aircraft which do not have Modification HCM01411A, B, or C embodied, and All BAe 146 RJ100 Series aircraft which do not have Modification HCM01411A or B embodied.                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect in accordance with BAE Systems Service Bulletin (SB) 53-130 or SB 53-131 Revision 1, as applicable; or later EASA approved service bulletin revision.The polymer coating on Frame 29 may prevent a thorough visual inspection. In this case, operators must utilise the referenced surface eddy current inspection technique.Note: UK CAA AD 012-05-94 and AD 013-03-95 refer.                                                                                                                                                                                                                                                                                                               |\n| Compliance:    | For BAe 146 aircraft:Unless already accomplished, at or before the ‘Threshold Inspection’ period detailed in Table ‘A’ of SB 53-130; and thereafter at the ‘Repeat Inspection’ intervals specified in Table ‘A’ of the service bulletin.For BAe 146 RJ aircraft:Unless already accomplished, at or before the ‘Threshold Inspection’ period detailed in Table 2 of SB 53-131 Revision 1; and thereafter at the ‘Repeat Inspection’ intervals specified in Table 2 of the service bulletin.The requirement for repeat inspections is cancelled if the work has been fully completed at each affected bolt position as detailed in Repair Instruction Leaflet HC536H9159 or HC536H9168, as applicable. |\n|                | This Amendment becomes effective on 16 February 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n\n| Background: | Cracking was experienced on the fatigue specimen in Frame 29 at the bolt holes in the web and inboard flange. The inspection will assist in finding the cracks before they develop to a critical length.Amendment 1 included Avro 146 RJ aircraft in the inspection requirements of this Directive.Amendment 2 responded to a revision of the BAe 146 (Avro) RJ aircraft Requirement document, which introduced the latest amendment of the Non-Destructive Testing Manual.Amendment 3 is issued to emphasise the requirement to accomplish an eddy current inspection of Frame 29 if the polymer coating does not allow a thorough visual inspection.The original issue of this airworthiness directive became effective on 22 June 1995. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n22 December 2005","sortOrder":0},{"sectionNumber":"AD/BAe 146/52 Amdt 3","sectionType":"part","heading":"AD/BAe 146/52 Amdt 3","content":"## AD/BAe 146/52 Amdt 3","sortOrder":1},{"sectionNumber":"Fuselage Frame 29","sectionType":"part","heading":"Fuselage Frame 29","content":"## Fuselage Frame 29","sortOrder":2},{"sectionNumber":"2/2006","sectionType":"part","heading":"2/2006","content":"## 2/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Yes. The directive’s scope has been broadened and refined over successive amendments: Amendment 1 added Avro/BAe 146 RJ aircraft to the requirement; Amendment 2 updated the requirement to reflect a revised Non‑Destructive Testing Manual; Amendment 3 adds an explicit eddy‑current inspection requirement where polymer coating prevents a thorough visual inspection. Operators must therefore apply the expanded applicability and updated NDT method requirements."},"complexity_factors":["Applicability varies by model and by whether specific modifications (HCM01411A/B/C) have been embodied, requiring operators to check modification status.","Multiple cross-references to BAE Service Bulletins (SB 53-130, SB 53-131 Rev 1) and allowance for later EASA‑approved revisions increases version-tracking.","Inspection timing tied to 'Threshold' and 'Repeat' tables contained in the service bulletins rather than the AD text, shifting compliance detail to external documents.","Conditional non‑destructive testing requirement: if polymer coating prevents visual inspection, a surface eddy‑current technique is mandated (Amendment 3).","Repeat inspection requirement is cancellable only where repairs are fully completed at each affected bolt position per Repair Instruction Leaflets HC536H9159 or HC536H9168.","Amendment history (original AD, Amendment 1 and 2, and this Amendment 3) alters applicability and test procedures, requiring operators to reconcile historical and current requirements.","Compliance date and historical effective dates must be observed (AD effective 16 Feb 2006; original AD effective 22 Jun 1995), adding administrative tracking."],"plain_english_summary":"This directive requires operators of BAe 146 series aeroplanes (including specified RJ70/85/100 variants that have not had certain modifications embodied) to inspect fuselage Frame 29 for fatigue cracking using BAE Systems Service Bulletins SB‑53‑130 or SB‑53‑131 (or later EASA‑approved revisions). If a polymer coating prevents a reliable visual check, operators must carry out a surface eddy‑current inspection; inspections follow the service bulletin’s threshold and repeat intervals, and repeat inspections stop where full repairs per Repair Instruction Leaflets HC536H9159/HC536H9168 are completed."},"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":4,"scope_assessment":{"changed":true,"description":"The original 1995 directive applied only to BAe 146 aircraft. Amendment 1 expanded scope to include Avro 146 RJ aircraft. Amendment 3 further refines the technical requirements by adding the eddy current inspection mandate, effectively tightening safety standards without expanding the aircraft pool. The directive has evolved from a basic inspection order to a more technically sophisticated safety instrument with conditional testing protocols."},"complexity_factors":["Multiple aircraft variants with different applicability rules (BAe 146 vs RJ series, with specific modification exclusions)","Cross-references to external technical documents (Service Bulletins 53-130 and 53-131 Revision 1, Repair Instruction Leaflets HC536H9159 and HC536H9168)","Conditional logic: different compliance timelines for different aircraft models","Nested conditions: the eddy current requirement only triggers if polymer coating prevents visual inspection","Termination condition for repeat inspections (completion of specific repairs)","Historical amendment tracking (references to Amendments 1 and 2, original 1995 issue, and UK CAA ADs)"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of BAe 146 and RJ70/85/100 series to inspect Frame 29 for fatigue cracks around bolt holes and to repeat inspections at set intervals until affected bolt positions are repaired. If a protective polymer coating prevents visual checks, eddy‑current (non‑destructive) inspection is mandatory.\n\nIt’s a safety action to prevent structural failure from fatigue, updating the original AD to explicitly require advanced testing where visual inspection isn’t possible."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-52-amdt-3-fuselage-frame-29","history":"/api/acts/ad-bae-146-52-amdt-3-fuselage-frame-29/history","analysis":"/api/acts/ad-bae-146-52-amdt-3-fuselage-frame-29/analysis","conflicts":"/api/acts/ad-bae-146-52-amdt-3-fuselage-frame-29/conflicts","importantCases":"/api/acts/ad-bae-146-52-amdt-3-fuselage-frame-29/important-cases","documents":"/api/acts/ad-bae-146-52-amdt-3-fuselage-frame-29/documents"}}