{"id":"F2007L04511","name":"AD/BELL 212/63 Amdt 1 - Tail Rotor Blade Fwd Tip Weight Retention Block and Aft Tip Closure","slug":"ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70964,"registerId":"commonwealth-F2007L04511-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 212 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 212 Series Helicopters","content":"### Bell Helicopter Textron 212 Series Helicopters\n\n| AD/BELL 212/63 Amdt 1 | Tail Rotor Blade Fwd Tip WeightRetention Block and Aft Tip Closure | 13/2007 |\n| --------------------- | ------------------------------------------------------------------ | ------- |\n\n| Applicability: | Model 212 helicopters with a tail rotor blade part number 212-010-750-009 through-129, all serial numbers, except serial numbers with a prefix of “A” or “AFS” and the number 11926, 13351, 13367, 13393, 13400, 13402, 13515, 13540, 13568, 13595 through 13602, 13619, and subsequent assigned numbers, installed. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Inspect the tail rotor blade forward tip weight retention block and aft tip closure for adhesive bond voids. Remove any tail rotor blade with a void in excess of that allowed by the Component Repair and Overhaul Manual limitations.2. Inspect the forward tip weight retention block attachment countersink screws in four locations to determine if the head of each countersink screw is flush with the surface of the abrasion strip. The locations of these four screws are depicted on Figure 1 of Bell Helicopter Textron Inc. Alert Service Bulletin (ASB)212-00-111 Revision D, or later FAA approved revision. If any of these screws are set below the surface of the abrasion strip or are covered with filler material, install shear pins in accordance with the Accomplishment Instructions, Part A, Shear Pin Installation paragraphs, of ASB 212-00-111 Revision D, or later FAA approved revision.3. Install the aft tip closure rivets, re-identify the modified blade by adding an “FM”, and dynamically balance the tail rotor hub assembly in accordance with the Accomplishment Instructions, Part B, Aft Tip Closure Rivet Installation paragraphs, of ASB 212-00-111 Revision D, or later FAA approved revision.Note: FAA AD 2007-22-02 Amdt 39-15238 refers. |\n| Compliance: | Within 100 hours time in service after 20 December 2007, unless already accomplished. |\n| | This Amendment becomes effective on 20 December 2007. |\n| Background: | The FAA received reports of five occurrences of missing tail rotor blade forward tip weight retention blocks or aft tip closures that resulted in minor to substantial damage. Such damage could result in loss of a tail rotor blade, and subsequent loss of control of the helicopter. |\n\n| | Amendment 1 is issued in response to a new FAA AD, which expands the applicability to include other part and serial-numbered blades. Additionally, the AD clarifies the requirement to re-identify the modified blade by adding “FM” after the part number, and requires dynamically balancing the tail rotor. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n7 November 2007","sortOrder":0},{"sectionNumber":"AD/BELL 212/63 Amdt 1","sectionType":"part","heading":"AD/BELL 212/63 Amdt 1","content":"## AD/BELL 212/63 Amdt 1","sortOrder":1},{"sectionNumber":"Tail Rotor Blade Fwd Tip WeightRetention","sectionType":"part","heading":"Tail Rotor Blade Fwd Tip WeightRetention Block and Aft Tip Closure","content":"## Tail Rotor Blade Fwd Tip Weight \nRetention Block and Aft Tip Closure","sortOrder":2},{"sectionNumber":"13/2007","sectionType":"part","heading":"13/2007","content":"## 13/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the AD's applicability to include additional part and serial-numbered blades, clarifies the requirement to re-identify modified blades by adding “FM”, and adds an explicit requirement to dynamically balance the tail rotor. These changes broaden who must comply and add procedural and post-modification tasks for operators."},"complexity_factors":["Technical aviation maintenance actions (bond inspection, shear pin installation, rivet installation, dynamic balancing) requiring specialised skills and equipment","Applicability tied to multiple part-number ranges with numerous serial-number exceptions, increasing determination effort for operators","Performance limits (adhesive bond voids) referenced to an external Component Repair and Overhaul Manual rather than stated numerically","Mandatory compliance deadline (100 hours TIS) creating operational scheduling and downtime costs","Dependence on an external manufacturer service bulletin (ASB 212-00-111 Rev D or later FAA-approved revision) for procedural detail and any later amendments","Coordination with FAA ADs and potential need to follow FAA-approved future revisions introduces regulatory interdependence","Re-identification requirement (adding “FM”) imposes recordkeeping and traceability work","Risk of part procurement and replacement costs where removals exceed allowable limits"],"plain_english_summary":"This amendment requires owners/operators of Bell 212 helicopters with specified tail-rotor blade part and serial numbers to inspect and, where necessary, repair or replace tail rotor forward tip weight retention blocks and aft tip closures, fit shear pins, rivet aft tip closures, mark modified blades with “FM” and dynamically balance the tail rotor. Compliance must occur within 100 hours time-in-service after 20 December 2007. The regulator enforces the requirement and references a Bell Alert Service Bulletin for the detailed technical steps; operators bear the parts, labour, and downtime costs."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"This Amendment expands the original directive's scope. The background note explicitly states it was issued 'in response to a new FAA AD, which expands the applicability to include other part and serial-numbered blades.' Additionally, it adds new requirements not in the original: the mandatory re-identification of modified blades with 'FM' marking and the dynamic balancing requirement. The directive has grown from its original safety purpose to cover a broader fleet and impose additional technical requirements."},"complexity_factors":["Dense applicability clause with multiple nested exceptions (excludes serial numbers with 'A' or 'AFS' prefixes plus a long list of specific serial numbers)","Requires cross-referencing external technical documents (Bell Helicopter Alert Service Bulletin 212-00-111 Revision D) for precise screw locations and repair procedures","Three distinct technical requirements with different compliance actions (inspection, conditional repair, mandatory modification)","Conditional logic: 'If voids exceed manual limits, remove blade' and 'If screws are below surface or covered with filler, install shear pins'","Technical aviation terminology requiring specialized knowledge (countersink screws, abrasion strip, shear pins, dynamic balancing, time in service)","Incorporates by reference FAA AD 2007-22-02, creating dual regulatory tracking requirements"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of Bell 212 helicopters with specified tail rotor blade part numbers to inspect and repair blade tip bonding, screw condition, and rear tip fastening, then mark modified blades and dynamically rebalance the tail rotor. \n\nIt responds to FAA reports of blades detaching in flight and must be complied with within 100 flight hours after 20 December 2007 to prevent loss of control and catastrophic accidents."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure","history":"/api/acts/ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/history","analysis":"/api/acts/ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/analysis","conflicts":"/api/acts/ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/conflicts","importantCases":"/api/acts/ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/important-cases","documents":"/api/acts/ad-bell-212-63-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/documents"}}