{"id":"F2006B04429","name":"AD/BELL 206/115 - Horizontal Stabilizer P/N 206-023-119-151","slug":"ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44254,"registerId":"commonwealth-F2006B04429-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/115 - Horizontal Stabilizer P/N 206-023-119-151","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/115 Horizontal Stabilizer P/N 206-023-119-151 13/89\n\nTX\n\nApplicability: Model 206L, 206L-1 and 206L-3.\n\nRequirement: 1. Inspect the horizontal stabilizer to determine if the raised external doubler is installed. The doubler is visible on the top of the stabilizer surface extending approx 100 mm (4\") outward from either side of the tail boom, and covers the upper surface of the horizontal stabilizer from within 12 mm (1/2\") of the forward leading edge to the trailing edge.\n\n2. Remove from service any stabilizer that does not have the doubler installed.\n\nNote 1: Installation of an external doubler will not bring the stabilizer into conformity nor provide an equivalent level of safety.\n\nNote 2: FAA AD 89-20-13 refers.\n\nCompliance: Prior to further flight after 20 October 1989.\n\nBackground: The FAA has determined that the subject stabilizers have been either incorrectly manufactured or repaired. The stabilizers may not have the required overall skin thickness, may not have a required external doubler and otherwise may not conform to the approved type design. There has been a failure where the stabilizer separated from the aircraft and struck the tail rotor.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in a specific aircraft part. It has not expanded beyond its original purpose of grounding faulty horizontal stabilizers."},"complexity_factors":["Single, specific part number targeted (P/N 206-023-119-151)","Only three helicopter models affected (206L, 206L-1, 206L-3)","Two straightforward requirements: visual inspection and removal if non-compliant","No defined terms section or complex interpretation provisions","Single compliance deadline with no conditional extensions or exceptions","Minimal cross-referencing (only one FAA AD reference in a note)","No nested exceptions or conditional logic"],"plain_english_summary":"This Airworthiness Directive orders immediate inspection of horizontal stabilizers (P/N 206-023-119-151) on Bell 206L, 206L-1, and 206L-3 helicopters to verify the presence of a raised external doubler; any stabilizer lacking it must be removed from service. Operators may not fly after 20 October 1989 until inspection and removals are completed, and retrofitting a doubler later does not remedy already-unsafe parts."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive targets a specific part number on specified helicopter models and mandates inspection and removal if non‑conforming; it implements the original safety correction for identified manufacturing/repair defects and does not expand scope beyond that purpose (Applicability; Requirement; Background)."},"complexity_factors":["Narrow applicability: only Bell 206L, 206L‑1 and 206L‑3 models are affected (Applicability).","Simple, visual inspection criterion: presence of a raised external doubler visible on the top surface (Requirement 1).","Binary required corrective action: remove from service any stabilizer without the doubler — no remedial installation path authorised by this AD (Requirement 2; Note 1).","Immediate compliance date creates operational disruption risk (Compliance).","Safety rationale clear and specific: prior stabilizer separation incident motivates the measure (Background).","Reference to an external regulatory action increases cross‑jurisdictional linkage (FAA AD 89‑20‑13 referenced in Note 2).","Potential compliance cost and downtime fall on aircraft owners/operators because affected units must be withdrawn (Requirement 2; Compliance)."],"plain_english_summary":"This directive requires operators of Bell 206L, 206L‑1 and 206L‑3 helicopters to inspect horizontal stabilizer P/N 206‑023‑119‑151 for a raised external doubler and to remove from service any stabilizer that lacks it (Requirement 1–2; Applicability). Compliance was required before further flight after 20 October 1989 because some stabilizers were manufactured or repaired incorrectly and one separated and struck the tail rotor; fitting a doubler later does not by itself restore conformity (Note 1; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151","history":"/api/acts/ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151/history","analysis":"/api/acts/ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151/analysis","conflicts":"/api/acts/ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151/conflicts","importantCases":"/api/acts/ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151/important-cases","documents":"/api/acts/ad-bell-206-115-horizontal-stabilizer-p-n-206-023-119-151/documents"}}