{"id":"F2019L00063","name":"AD/BELL 206/57 Amdt 4 Horizontal Stabilizer","slug":"ad-bell-206-57-amdt-4-horizontal-stabilizer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":98695,"registerId":"commonwealth-F2019L00063-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 20","sectionType":"part","heading":"Bell Helicopter Textron Canada (BHTC) 206 and Leonardo Helicopters (Agusta) AB206 Series Helicopters","content":"# Bell Helicopter Textron Canada (BHTC) 206 and Leonardo Helicopters (Agusta) AB206 Series Helicopters\n\n| AD/BELL 206/57 Amdt 4 | Horizontal Stabilizer | 2/2019 |\n| --------------------- | --------------------- | ------ |\n\n| Applicability: | All models of Bell 206 and Leonardo (Agusta Bell) AB206 helicopters with horizontal stabilizers part number (P/N) 206-020-119 (all dash numbers) or P/N206-020-123-3, -4, -3C2 and -4C2, if the stabilizer is fitted with inboard rib P/N206-020-119-051 or -052.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Visually inspect the horizontal stabilizer as described in Bell SB 206-01-73-7 Revision E Paragraph 2, as in force at the time of issue of this AD or Agusta SB206-75 Revision B, as in force at the time of issue of this AD, as applicable.The result of visual inspections, including nil findings, and certification that the AD has been complied with, must be recorded in the aircraft logbook or aircraft maintenance release.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Compliance:    | At intervals not exceeding 25 hours’ time in service.Compliance may be achieved through visual inspection by a pilot who:(a) is authorised to carry out maintenance by the aircraft’s approved system of maintenance; and(b) has been trained on how to meet the Requirement above, including the conduct of the visual inspection.Note 1: Stabilizers that have been repaired in accordance with the documents mentioned in the Requirement section still require the repetitive inspections in accordance with this AD.Note 2: This AD does not authorise pilot maintenance, which is governed by the Regulations. A pilot may perform the visual inspection using a mirror and torch, in accordance with the scheme for permitted pilot maintenance under CAR, if the use of mirror and torch is covered in the training for the visual inspection.Previously approved AMOCs / Exclusions issued for AD/BELL 206/57 Amdt 3 remain valid since there has been no technical changes to the AD. |\n|                | This AD commences on 31 January 2019.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | Amendment 2 corrected the part number applicability and, as a result of local defect experience, clarified the repetitive inspection requirements for repaired stabilizers.Amendment 3 updated the applicability to include the applicable inboard rib part numbers.Amendment 4 approves the visual inspection and certification by a task trained pilot who is authorised to carry out maintenance by the aircraft’s approved system of maintenance.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n23 January 2019","sortOrder":0},{"sectionNumber":"AD/BELL 206/57 Amdt 4","sectionType":"part","heading":"AD/BELL 206/57 Amdt 4","content":"## AD/BELL 206/57 Amdt 4","sortOrder":1},{"sectionNumber":"Horizontal Stabilizer","sectionType":"part","heading":"Horizontal Stabilizer","content":"## Horizontal Stabilizer","sortOrder":2},{"sectionNumber":"2/2019","sectionType":"part","heading":"2/2019","content":"## 2/2019","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Yes. The AD's scope was adjusted across amendments: Amendment 2 corrected stabilizer part-number applicability and clarified repetitive inspections for repaired stabilizers; Amendment 3 expanded applicability to include specific inboard rib part numbers; Amendment 4 authorised visual inspection and certification by a task-trained pilot authorised under the aircraft’s approved maintenance system (Background). These changes modify which serials/components are captured and who may perform inspections."},"complexity_factors":["Multiple specific part-number applicability including dash variants and inboard rib P/Ns (Applicability)","Mandatory reference to external service documents: Bell SB 206-01-73-7 Revision E and Agusta SB206-75 Revision B (Requirement)","Short repetitive interval: inspections at intervals not exceeding 25 hours’ time in service (Compliance)","Allows inspections by pilots only if authorised by the aircraft’s approved maintenance system and task-trained, creating a training/authorization compliance layer (Compliance)","Record-keeping obligation: every inspection result, including nil findings, must be entered in aircraft logbook/maintenance release (Requirement)","Repairs do not remove the repetitive inspection requirement, so repaired parts remain in the inspection loop (Note 1)","Interaction with maintenance regulation: AD does not authorise pilot maintenance generally; permitted pilot maintenance scheme and training limits apply (Note 2)","Previously approved alternative methods of compliance (AMOCs)/exclusions remain valid (Compliance/Background)","Commencement date establishes an operational deadline (Commences on 31 January 2019)"],"plain_english_summary":"This airworthiness directive requires a visual inspection of specified horizontal stabilizers on Bell 206 and AB206 helicopters (certain stabilizer and inboard rib part numbers) every 25 hours' time in service, with results and certification entered in the aircraft logbook or maintenance release. Trained pilots who are authorised by the aircraft’s approved maintenance system may perform the inspection (mirror and torch allowed if covered in training). The AD's amendments corrected part-number applicability, clarified inspections for repaired stabilizers and authorised pilot task-trained inspections."},"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":3,"scope_assessment":{"changed":true,"description":"The original AD (implied by Amendment 2 and 3 references) appears to have been a straightforward mechanical inspection requirement. Amendment 4 significantly expands the scope by introducing an alternative compliance pathway through pilot-performed inspections, effectively changing the AD from a purely maintenance-engineering directive to one that encompasses pilot training and authorisation systems. This represents a shift from mechanical safety regulation to operational procedure regulation."},"complexity_factors":["Multiple specific part numbers with dash number variations (4 distinct part number ranges with conditional applicability)","Cross-references to external technical documents (Bell SB 206-01-73-7 Revision E and Agusta SB206-75 Revision B) without reproducing their content","Conditional compliance pathway allowing pilot-performed inspections with dual prerequisites (authorisation AND training)","Nested applicability criteria: must meet helicopter model AND stabilizer part number AND inboard rib part number","Two notes creating exceptions/clarifications to the main requirement","Reference to previously approved Alternative Means of Compliance (AMOCs) remaining valid"],"plain_english_summary":"This AD mandates regular visual inspections of the horizontal stabiliser on specified Bell 206 and Leonardo (Agusta) AB206 helicopters to detect potential structural weakness that could affect flight safety. Inspections are required at 25‑hour intervals and results must be logged.\n\nAmendment 4 allows authorised, specifically trained pilots to perform the inspection themselves, easing compliance and reducing downtime while preserving safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-57-amdt-4-horizontal-stabilizer","history":"/api/acts/ad-bell-206-57-amdt-4-horizontal-stabilizer/history","analysis":"/api/acts/ad-bell-206-57-amdt-4-horizontal-stabilizer/analysis","conflicts":"/api/acts/ad-bell-206-57-amdt-4-horizontal-stabilizer/conflicts","importantCases":"/api/acts/ad-bell-206-57-amdt-4-horizontal-stabilizer/important-cases","documents":"/api/acts/ad-bell-206-57-amdt-4-horizontal-stabilizer/documents"}}