{"id":"F2020L00146","name":"AD/R22/30 Amdt 6 Main Rotor Spindle","slug":"ad-r22-30-amdt-6-main-rotor-spindle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":100720,"registerId":"commonwealth-F2020L00146-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Robinson Helicopter Company R22 Series H","sectionType":"part","heading":"Robinson Helicopter Company R22 Series Helicopters","content":"# Robinson Helicopter Company R22 Series Helicopters\n\n| AD/R22/30 Amdt 6 | Main Rotor Spindle | 4/2020 |\n| ---------------- | ------------------ | ------ |\n\n| Applicability: | All Robinson Helicopter Company R22 helicopters fitted with main rotor spindle part number A158-1 and journal part number A106.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Action in accordance with the Compliance Procedures of Robinson Helicopter Company Service Bulletin (SB) No. 60A, as in force from time to time.2. Visually inspect reworked spindle part number A158-1, and journal part number A106, for cracks in accordance with requirement 1 above.Note 1: This directive applies to all Robinson Helicopter Company R22 helicopters regardless of serial number. The Federal Aviation Administration of the United States of America (FAA) has determined that all R22 helicopters could be affected, not just those identified in the Requirement Document.Note 2: FAA AD 88-26-01R2 Amdt 39-6646 is consistent with this AD.Note 3: Robinson R22 Service Letter (SL) SL-68 refers to new part number A158-3 main rotor blade (MRB) spindles which are now available and are not subject to CASA AD/R22/30 Amdt 6 or FAA AD 88-26-01R2.                                      |\n| Compliance:    | 1. Before 28 April 1989.2. Within 500 hours’ time in service after 23 March 2000, and thereafter at intervals not to exceed 500 hours’ time in service.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n|                | This AD commences on 4 March 2020.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | A crack was found in a main rotor spindle after a balance check of the main rotor could not be achieved. Upon rotor blade removal, a crack was found running from the spindle bolt hole to the spindle upper surface. Failure to detect the crack would have resulted in blade separation. Amendment 3 corrected the related FAA AD reference.Amendment 6 is issued to clarify the inapplicability of CASA AD/R22/30 Amdt 6 and FAA 88-26-01R2 to later MRB spindles, part number A158-3. Robinson Helicopter Company R22 Service Letter SL-68 refers.Amendment 5 was issued to clarify the applicability of the Airworthiness Directive. The related FAA AD applies to all R22 Helicopters, not just those identified by serial number in Robinson SB 60A.Amendment 4 of this Airworthiness Directive became effective on 23 March 2000 and was issued to correct an anomaly in the repetitive inspection requirement. |\n|                | Amendment 3 of this Airworthiness Directive became effective on 21 March 1991.The original issue of this Airworthiness Directive became effective on 10 November 1988.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n\n![A picture containing music\nDescription automatically generated](image.001.png)\n\nBen Wilson  \nDelegate of the Civil Aviation Safety Authority\n\n18 February 2020","sortOrder":0},{"sectionNumber":"AD/R22/30 Amdt 6","sectionType":"part","heading":"AD/R22/30 Amdt 6","content":"## AD/R22/30 Amdt 6","sortOrder":1},{"sectionNumber":"Main Rotor Spindle","sectionType":"part","heading":"Main Rotor Spindle","content":"## Main Rotor Spindle","sortOrder":2},{"sectionNumber":"4/2020","sectionType":"part","heading":"4/2020","content":"## 4/2020","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (1988) applied to specific serial numbers identified in Robinson SB 60A. Amendment 5 expanded applicability to ALL R22 helicopters regardless of serial number, following FAA determination that the safety risk was universal. Amendment 6 further refined scope by explicitly excluding newer A158-3 spindles. The directive has evolved from targeted intervention to universal application with specific exclusions, significantly broadening its reach while carving out exceptions for improved components."},"complexity_factors":["Multiple amendment history references (Amendments 3, 4, 5, 6) create contextual clutter","Cross-reference to external documents: Robinson Service Bulletin SB No. 60A and FAA AD 88-26-01R2","Dual compliance timelines (original 1989 deadline vs 2000 repetitive inspection regime)","Part number specificity requiring careful identification (A158-1 vs A158-3 distinction)","Nested applicability notes clarifying scope expansion beyond original serial number limitations"],"plain_english_summary":"This CASA Airworthiness Directive mandates repetitive inspections of Robinson R22 main rotor spindles (part A158-1 with journal A106) for cracks, using Robinson Service Bulletin SB No. 60A, because undetected cracks could allow a rotor blade to separate in flight. It applies to all R22s regardless of serial number, with inspections every 500 flight hours.\n\nAmendment 6 clarifies that replacement spindles P/N A158-3 are excluded from this AD."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Amendments altered scope: earlier amendments expanded applicability to note the FAA considered all R22 helicopters affected regardless of serial number (Background; Amendment 5). Amendment 6 clarified that later main rotor spindle part number A158‑3 is not subject to this AD (Requirement Note 3; Background), thereby narrowing scope for helicopters fitted with the newer spindles while maintaining inspection requirements for A158‑1/A106 units."},"complexity_factors":["Cross-reference to Robinson Service Bulletin No. 60A whose requirements apply “as in force from time to time,” creating a moving external compliance standard (Requirement 1).","Multiple dated compliance deadlines and an AD commencement date that do not align chronologically (Compliance; “This AD commences on 4 March 2020”; Compliance dates: “Before 28 April 1989” and “Within 500 hours … after 23 March 2000”).","Applicability tied to specific part numbers A158‑1 and A106 while FAA findings and earlier amendments treat all R22s as potentially affected, producing scope tension (Applicability; Note 1; Background).","Repetitive inspection regime with a 500‑hour interval imposes ongoing maintenance planning and recordkeeping on operators (Compliance).","Existence of an alternative path via newer part number A158‑3 which is excluded from this AD, adding an option to replace rather than inspect (Requirement Note 3; Background).","Multiple amendments and cross-references to FAA ADs and Robinson service letters increase interpretive burden (Background: Amendments 3–6; FAA AD references).","Inspection requirement distinguishes reworked spindles and journals, creating potential ambiguity for identifying material condition and applicable actions (Requirement 2).","Safety consequence (blade separation if cracks undetected) raises enforcement and verification importance for regulators and operators (Background)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Robinson R22 helicopters fitted with main rotor spindle A158-1 and journal A106 to follow Robinson Service Bulletin No. 60A compliance procedures and to visually inspect reworked spindles and journals for cracks. Inspections are mandated before 28 April 1989, and then within 500 hours after 23 March 2000 and at 500‑hour intervals thereafter; the measure aims to detect cracks that could lead to blade separation."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-r22-30-amdt-6-main-rotor-spindle","history":"/api/acts/ad-r22-30-amdt-6-main-rotor-spindle/history","analysis":"/api/acts/ad-r22-30-amdt-6-main-rotor-spindle/analysis","conflicts":"/api/acts/ad-r22-30-amdt-6-main-rotor-spindle/conflicts","importantCases":"/api/acts/ad-r22-30-amdt-6-main-rotor-spindle/important-cases","documents":"/api/acts/ad-r22-30-amdt-6-main-rotor-spindle/documents"}}