{"id":"F2006B09219","name":"AD/DHC-8/62 Amdt 2 - Flap Carriage Hook Roller Shafts","slug":"ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53074,"registerId":"commonwealth-F2006B09219-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/62 Amdt 2 - Flap Carriage Hook Roller Shafts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n![](image.002.png)  \nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/DHC-8/62 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/DHC-8/62\n\nAmdt 2\n\n  \nFlap Carriage Hook Roller Shafts 13/2000\n\nApplicability: Model DHC-8 Series 100, 200, and 300 aircraft, serial numbers 3 through 555.\n\nRequirement: 1. Implement a detailed visual inspection of the flap carriage hook roller shafts part number (P/N) 85750362-103 and/or P/N 85750362-105 for condition , in accordance with the inspection schedule introduced by the applicable Temporary Revision (TR) of the Airworthiness Limitations List (AWL) of the DHC-8 Maintenance Manual as detailed below:\n\n    (a) For Series 100 aircraft: PSM 1-8-7: TR AWL-75 and AWL-76 dated 14 July\n\n2000.\n\n    (b) For Series 200 aircraft: PSM 1-82-7: TR AWL 2-19 dated 14 July 2000.\n\n    (c) For Series 300 aircraft: PSM 1-83-7: TR AWL 3-83 dated 14 July 2000.\n\nReplace any flap carriage hook roller shafts that are determined to be cracked, before further flight.\n\n2. Replace all flap carriage hook roller shafts P/N 85750362-103 and P/N 85750362- 105 with Post Mod 8Q101103 roller shafts P/N 85750362-107.\n\nFollowing installation of the Post Mod 8Q101103 roller shafts P/N 85750362-107, comply with the Structural Inspection Program for the Mod 8Q101103 roller shafts as introduced by the Temporary Revisions detailed in Requirement 1.\n\nNote 1: Installation of Post Mod 8Q101103 roller shafts P/N 85750362-107 provides terminating action to the inspection requirements for the Pre Mod 8Q100429 roller shafts P/N 85750362-103 and the Post Mod 8Q100429 roller shafts P/N 85750362- 105.\n\nNote 2: Transport Canada AD CF-1999-10R2 refers.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nCompliance: 1. If the number of flight cycles on an aircraft exceeds the 20,000 flight cycle inspection threshold, or if the 20,000 flight cycle threshold inspection becomes due in less than 12 months after 24 February 2000, carry out the threshold inspection before 24 February 2001.\n\n2. Within 5 years or 20,000 flight cycles after 28 December 2000, whichever occurs first.\n\nThe compliance times for Requirement 1 remains unchanged by this issue. This Amendment becomes effective on 28 December 2000.\n\nBackground: Corrosion of flap carriage hook roller shafts Pre Mod 8Q100429, were found on several in-service aircraft. An investigation by Bombardier identified deficiencies in the manufacturing process that may have resulted in inadequate corrosion protection of some hook roller shafts. If not addressed, cracks initiating from the corrosion sites on the hook roller shafts can degrade the structural integrity of the flap system.\n\nAmendment 1 clarified that the inspection schedule for the flap carriage hook roller shafts did not amend the inspection schedule for the other flap carriage components that are associated with the same inspection Task Number.\n\nAmendment 2 is issued in response to a revision of the related Transport Canada AD which adds P/N 85750362-105 flap carriage hook roller shafts to the inspection and replacement requirements, and updates the TR status of the AWL of the DHC-8 Maintenance Manual.\n\n![](image.003.png)  \nAmendment 1 of this Airworthiness Directive became effective on 24 February 2000\\. The original issue of this Airworthiness Directive became effective on 15 July 1999.\n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 8 November 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 22 November 2000.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 2 expands the AD's scope by adding part number P/N 85750362-105 to the inspection and replacement requirements and updates the Temporary Revision status of the AWL for the DHC-8 Maintenance Manual. Amendment 1 previously clarified that the AWL change did not alter inspection requirements for other flap carriage components (Background/Amendment 1; Background/Amendment 2)."},"complexity_factors":["Applicability limited to DHC-8 Series 100, 200, 300, serial numbers 3–555 (Applicability) — discrete fleet scope.","Multiple part numbers and modification states to track: P/N 85750362-103 (Pre Mod 8Q100429), P/N 85750362-105 (Post Mod 8Q100429), and replacement P/N 85750362-107 (Post Mod 8Q101103) (Requirement 1–2; Note 1).","Inspections are mandated by Temporary Revisions to the Airworthiness Limitations List (AWL) of the DHC-8 Maintenance Manual, requiring maintenance organisations to follow TR AWL entries per series (Requirement 1).","Conditional compliance timing based on flight cycles and calendar dates (20,000 flight-cycle threshold, specific dates referenced) and a 5-year/20,000-cycle replacement window (Compliance).","Installation of the new P/N 85750362-107 provides terminating action to earlier inspection obligations (Note 1), creating a trade-off between upfront replacement cost and recurring inspection burden.","Cross-reference to a related Transport Canada AD (Note 2/Background) requires operators to reconcile multiple authorities and revised foreign ADs.","Safety rationale and root cause in the Background: corrosion and manufacturing-process deficiencies — introduces urgency but limited prescriptive remediation beyond inspection and replacement wording.","Amendment history: clarification in Amendment 1 about unrelated flap carriage component inspections and the addition of P/N 85750362-105 in Amendment 2 (Background/Amendment 2) increases interpretation points for implementers.","Immediate safety action: cracked shafts must be replaced before further flight (Requirement 1) — potential for short-notice maintenance and operational disruption."],"plain_english_summary":"This directive requires operators of Bombardier DHC-8 Series 100/200/300 aeroplanes (serials 3–555) to inspect specified flap carriage hook roller shafts (P/N 85750362-103 and P/N 85750362-105) under Temporary Revisions to the Airworthiness Limitations List, replace any cracked shafts before further flight, and replace all 103/105 shafts with Post Mod 8Q101103 shafts (P/N 85750362-107).\n\nIt responds to discovered corrosion and manufacturing deficiencies; compliance is driven by a 20,000 flight-cycle threshold or fixed dates, and fitting the new P/N 85750362-107 stops the earlier inspection requirement."},"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":"The original directive (July 1999) addressed only Pre Mod 8Q100429 shafts (P/N 85750362-103). Amendment 1 (February 2000) clarified inspection scheduling but didn't expand scope. Amendment 2 (November 2000) significantly expanded scope by adding Post Mod 8Q100429 shafts (P/N 85750362-105) to the requirements, effectively covering shafts that were previously considered 'fixed' by an earlier modification. This doubled the affected part population and introduced a new terminating modification (8Q101103)."},"complexity_factors":["Multiple part numbers (P/N 85750362-103, -105, -107) with different modification statuses (Pre Mod 8Q100429, Post Mod 8Q100429, Post Mod 8Q101103) that must be tracked separately","Three different aircraft series (100, 200, 300) each with separate maintenance manual references (PSM 1-8-7, 1-82-7, 1-83-7) and different Temporary Revision numbers","Dual compliance timelines: one based on flight cycles (20,000 cycles) and one based on calendar dates (24 February 2000/2001, 28 December 2000), with 'whichever occurs first' logic","Nested requirements: Requirement 1 inspections continue even after Amendment 2, while Requirement 2 introduces a separate replacement mandate with its own 5-year/20,000-cycle deadline","Cross-reference to Canadian aviation safety regulation (Transport Canada AD CF-1999-10R2), requiring operators to consult foreign documentation","Terminating action concept: installation of new parts ends inspection obligations for old parts, creating a conditional compliance pathway"],"plain_english_summary":"This safety order requires owners/operators of De Havilland DHC‑8 Series 100/200/300 (serials 3–555) to inspect and replace corroded flap carriage hook roller shafts that can crack due to a manufacturing defect. It mandates immediate replacement of cracked parts and eventual fitment of an improved shaft to eliminate recurring inspections. Compliance is mandatory because shaft failure could cause flap loss and risk of loss of control during critical flight phases."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts","history":"/api/acts/ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts/history","analysis":"/api/acts/ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts/analysis","conflicts":"/api/acts/ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts/conflicts","importantCases":"/api/acts/ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts/important-cases","documents":"/api/acts/ad-dhc-8-62-amdt-2-flap-carriage-hook-roller-shafts/documents"}}