{"id":"F2007L03802","name":"AD/BELL 206/167 Amdt 3 - Transmission Pylon Support Spindle","slug":"ad-bell-206-167-amdt-3-transmission-pylon-support-spindle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70297,"registerId":"commonwealth-F2007L03802-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 20","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n| AD/BELL 206/167 Amdt 3 | Transmission Pylon Support Spindle | 12/2007 DM |\n| ---------------------- | ---------------------------------- | ---------- |\n\n| Applicability: | Bell Model 206 A and B series helicopters, and Agusta Model AB 206 A and B series helicopters; that have the following part number 206-031-554 Transmission Pylon Support Spindle (Spindle) serial numbers, installed:Spindles repaired by Cadorath Aerospace Inc.,B12-11568, B12-12244, B12-12260, B12-12647, B12-12676, B12-12847,B12-13292, B12-14395, B12-15750, B12-17149, B12-17266, B12-1828, B12-18649, B12-19330, B12-19381, B12-20668, B12-2224, B12-2286, B12-3595, B12-3774, B12-3808, B12-5171, B12-757, B12-8053, B12-8605, B12-932, B-21223, B-21297, B22005, B22515, B-22558, CAI3852, CAI3853, EA287, EA318, EA322, EA393, EA751, EA761, MW546, RE1044, RE113, RE743.Spindles repaired by H-S Tools & Parts Inc.,B12-11127, B12-12883, B12-13158, B12-13535, B12-13545, B12-13593,B12-13657, B12-13716, B12-14061, B12-14078, B12-15131, B12-15908,B12-16078, B12-16267, B12-16825, B12-16867, B12-17149, B12-17266,B12-18157, B12-18163, B12-18456, B12-19450, B12-21573, B12-3106, B12-605, B12-7627, B-22385, EA-391, MW445, MW506, MW546, RE278, RE329, RE852. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Check the technical logbook entries to determine if a Spindle part number206-031-554 with a serial number listed in the Applicability section above is installed on the helicopter.If an affected Spindle is installed, before further flight, replace the Spindle with a serviceable part.Note: Transport Canada AD CF-2007-02R1, EASA ADs 2007-0257 and 2007-0089, refer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Compliance:    | Within 16 flight hours after 25 September 2007, but no later than15 October 2007; unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n|                | This Amendment becomes effective on 25 September 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n\n| Background: | A Transportation Safety Board of Canada investigation into an accident has revealed that the Spindle repaired by Cadorath Aerospace Inc., failed during flight and resulted in loss of control of the helicopter. This Directive requires removal of all Spindles repaired by Cadorath Aerospace Inc.Amendment 1 required the same technical actions as the original issue of this Directive to be applied to Agusta Model 206 A and B series helicopters.Amendment 2 corrected the text of the compliance statement for Model AB 206 helicopters, with no change to the compliance time.Amendment 3 is issued in response to a revision of the related Transport Canada AD and a new EASA AD, which include Spindles repaired by HS Tools & Parts Inc. to the applicability. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n20 September 2007","sortOrder":0},{"sectionNumber":"AD/BELL 206/167 Amdt 3","sectionType":"part","heading":"AD/BELL 206/167 Amdt 3","content":"## AD/BELL 206/167 Amdt 3","sortOrder":1},{"sectionNumber":"Transmission Pylon Support Spindle","sectionType":"part","heading":"Transmission Pylon Support Spindle","content":"## Transmission Pylon Support Spindle","sortOrder":2},{"sectionNumber":"12/2007 DM","sectionType":"part","heading":"12/2007 DM","content":"## 12/2007 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 3 expanded the applicability to include spindles repaired by H‑S Tools & Parts Inc.; earlier amendments added Agusta AB 206 helicopters and corrected compliance text. The directive's mechanical requirement (remove and replace listed spindles) remains, but the population of affected parts was increased (Background)."},"complexity_factors":["Long, explicit list of affected serial numbers requires manual logbook checks and parts traceability.","Applicability limited by model, part number and specific repairers increases administrative filtering.","Short compliance window (16 flight hours / fixed date) raises operational scheduling pressure.","Cross-references to foreign ADs (Transport Canada, EASA) create coordination and verification steps.","Amendment history alters scope (adds repairer), requiring operators to track revisions for completeness."],"plain_english_summary":"This airworthiness directive requires operators to check technical logbooks and, if installed, remove and replace specific Transmission Pylon Support Spindles (P/N 206-031-554) with listed serial numbers repaired by Cadorath Aerospace Inc. or H‑S Tools & Parts Inc. on Bell 206 A/B and Agusta AB 206 A/B helicopters (Applicability; Requirement). Operators must complete replacements within 16 flight hours after 25 Sep 2007 or by 15 Oct 2007; the action follows an investigation into a spindle failure (Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (implied by Amendment 1 and 2 references) applied only to Cadorath Aerospace repairs. Amendment 3 significantly expanded the scope to include spindles repaired by H-S Tools & Parts Inc. after new European and Canadian safety directives identified additional defective repairs. The core purpose (removing faulty spindles) remained consistent, but the population of affected aircraft grew substantially."},"complexity_factors":["Highly specific applicability limited to two helicopter model series and 77 specific serial numbers","Simple binary compliance requirement (check logbook → replace if affected → no flight until done)","Clear, fixed compliance deadline with minimal conditional language","No nested exceptions or complex alternative compliance methods","Straightforward amendment history explaining incremental expansion of scope","Extensive serial number lists create visual density but do not add legal complexity"],"plain_english_summary":"This AD orders immediate grounding and replacement of certain transmission pylon support spindles on Bell 206A/B and Agusta AB 206A/B helicopters because repairs by Cadorath Aerospace Inc. and H‑S Tools & Parts Inc. were found defective. A spindle failure already caused a loss-of-control accident.\n\nOwners/operators of affected serial-numbered spindles must install a serviceable part within 16 flight hours after Sept 25, 2007 and no later than Oct 15, 2007."},"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-206-167-amdt-3-transmission-pylon-support-spindle","history":"/api/acts/ad-bell-206-167-amdt-3-transmission-pylon-support-spindle/history","analysis":"/api/acts/ad-bell-206-167-amdt-3-transmission-pylon-support-spindle/analysis","conflicts":"/api/acts/ad-bell-206-167-amdt-3-transmission-pylon-support-spindle/conflicts","importantCases":"/api/acts/ad-bell-206-167-amdt-3-transmission-pylon-support-spindle/important-cases","documents":"/api/acts/ad-bell-206-167-amdt-3-transmission-pylon-support-spindle/documents"}}