{"id":"F2007L04512","name":"AD/BELL 205/70 Amdt 1 - Tail Rotor Blade Fwd Tip Weight Retention Block and Aft Tip Closure","slug":"ad-bell-205-70-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":70967,"registerId":"commonwealth-F2007L04512-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 205 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 205 Series Helicopters","content":"### Bell Helicopter Textron 205 Series Helicopters\n\n| AD/BELL 205/70 Amdt 1 | Tail Rotor Blade Fwd Tip WeightRetention Block and Aft Tip Closure | 13/2007 |\n| --------------------- | ------------------------------------------------------------------ | ------- |\n\n| Applicability: | Model 205A, 205A-1, and 205B helicopters with a tail rotor blade part number212-010-750-009 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) 205-00-80 Revision D or 205B-00-34 Revision D, or later FAA approved revisions, as applicable. 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 205-00-80 Revision D or 205B-00-34 Revision D, or later FAA approved revisions, as applicable.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 205-00-80 Revision D or 205B-00-34 Revision D, or later FAA approved revisions, as applicable.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\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.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 205/70 Amdt 1","sectionType":"part","heading":"AD/BELL 205/70 Amdt 1","content":"## AD/BELL 205/70 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 expanded the AD's applicability to include additional blade part and serial numbers and clarified requirements to re‑identify modified blades and perform dynamic balancing. This change in scope is stated in the Background: the amendment was issued in response to a new FAA AD that expands applicability and clarifies re‑identification and balancing (Background)."},"complexity_factors":["Narrow and detailed applicability list with multiple serial‑number exclusions increases identification work for operators (Applicability).","Technical inspections required (adhesive bond void inspection; countersink screw flushness) demand skilled maintenance labour and access to the Component Repair and Overhaul Manual for limits (Requirement 1–2).","Corrective options include removal of blades exceeding repair limits, installation of shear pins, and aft tip closure rivet installation — each is hands‑on work that may require shop time and parts (Requirement 1–3).","Re‑identification of modified blades by adding “FM” and mandatory dynamic balancing of the tail rotor hub add administrative and shop-balance steps (Requirement 3).","Short compliance window imposes scheduling pressure: must be done within 100 hours time in service after 20 December 2007 unless already accomplished (Compliance).","Dependence on external service documents and approvals (Bell ASB 205-00-80 Rev D or 205B-00-34 Rev D or later FAA‑approved revisions; FAA AD cross‑reference) creates document‑control and versioning complexity (Requirement; Note).","Direct cost and operational burden fall on aircraft owners/operators and their maintenance providers who must decide, fund and perform inspections and repairs (implied from Requirement and Compliance).","Potential for parts, tooling or shop‑availability constraints given rivet installation and dynamic balancing tasks (implied from Requirement 3)."],"plain_english_summary":"Mandates inspection and, if necessary, repair or replacement of specified Bell 205 tail rotor blade forward tip weight retention blocks and aft tip closures, plus re-identification and dynamic balancing after modification. The rule targets operators of Model 205A/205A‑1/205B helicopters with the listed blade part and serial numbers to reduce the risk of blade loss after reports of missing tip components."},"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":4,"scope_assessment":{"changed":true,"description":"This Amendment 1 significantly expanded the original directive's scope. The Background 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 added new mandatory requirements (re-identification marking with 'FM' and dynamic balancing) that weren't in the original AD/BELL 205/70."},"complexity_factors":["Dense serial number exclusions requiring careful cross-checking (17 specific exclusions plus 'subsequent assigned numbers')","Multiple reference documents required (Bell ASB 205-00-80 Rev D or 205B-00-34 Rev D with 'later FAA approved revisions')","Three distinct technical inspection/repair procedures with specific conditional triggers","Part number ranges (-009 through -129) requiring verification against aircraft records","Dual regulatory reference (FAA AD 2007-22-02) creating cross-border dependency","Technical aviation terminology requiring specialist knowledge (countersink screws, abrasion strip, shear pins, dynamic balancing)"],"plain_english_summary":"This AD mandates inspection and remedial work on specified Bell 205 tail rotor blades—removing or repairing blades with degraded adhesive bonds or improperly seated fasteners, adding aft-tip rivets, re-identifying modified blades, and dynamically rebalancing the rotor. It applies to owners/operators of affected Bell 205A/205A‑1/205B helicopters to prevent blade separation and loss of control following reported in‑flight failures.\n\nCompliance was required within 100 flight hours after 20 December 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-205-70-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure","history":"/api/acts/ad-bell-205-70-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/history","analysis":"/api/acts/ad-bell-205-70-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/analysis","conflicts":"/api/acts/ad-bell-205-70-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/conflicts","importantCases":"/api/acts/ad-bell-205-70-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/important-cases","documents":"/api/acts/ad-bell-205-70-amdt-1-tail-rotor-blade-fwd-tip-weight-retention-block-and-aft-tip-closure/documents"}}