{"id":"F2006B09220","name":"AD/DHC-8/63 Amdt 2 - Horizontal Stabiliser Skin Disbonding Follow-Up - 2","slug":"ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53078,"registerId":"commonwealth-F2006B09220-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/63 Amdt 2 - Horizontal Stabiliser Skin Disbonding Follow-Up - 2","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-8/63 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 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-8/63\n\nAmdt 2\n\n  \n\nHorizontal Stabiliser Skin Disbonding Follow-Up \\- 2\n\n  \n3/2000\n\nApplicability: All DHC-8 Series aircraft which have horizontal stabilisers serial numbers CAP 003 through CAP 050 fitted.\n\nNote: As the aircraft serial number may not be the same as that of the horizontal stabiliser, it may be necessary to check the data plate on the left side of the horizontal stabiliser and the component record cards to identify the stabiliser.\n\nRequirement: 1. Provide bond integrity test samples as follows:\n\n    In accordance with instructions in Bombardier Repair Drawing (RD) RD8-55- 669 Issue 3, dated 17 March 1999, cut small samples from the affected bonded horizontal stabiliser skins as test coupons for bonding integrity testing.\n\n    b. Mark the cut samples in accordance with instructions in RD8-55-669 Issue 3.\n\n    c. Send the cut samples to Bombardier Aerospace at the address shown in RD8- 55-669 Issue 3, for testing.\n\n    d. Complete installation of the repair in accordance with RD8-55-669 Issue 3 to return aircraft to service.\n\n    2. Replace and/or repair the horizontal stabiliser, or;\n\n    3. Return the horizontal stabiliser to the normal bonding integrity inspection program in accordance with PSM 1-8-7.\n\nNote: Transport Canada AD CF-99-15 R1 refers.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nCompliance: 1. Unless already accomplished, provide samples to Bombardier for testing before 24 April 2000.\n\n    2. Replace or repair before further flight if notified by Bombardier Aerospace that the bonding samples do not meet the acceptance criteria specified in the Appendix to Bombardier engineering document, AEROC 8.4.AC.12, Section 55-0013-1, Issue\n    2. Otherwise, replace or repair if no notification is received within 30 days after completion of repair action described in Requirement 1, or;\n\n    3. Return the horizontal stabiliser to the normal inspection program if notified by Bombardier Aerospace that the bonding samples meet the acceptance criteria specified in the Appendix to Bombardier engineering document, AEROC 8.4.AC.12, Section 55-0013-1, Issue 2.\n\nThe compliance time for Requirement 1 remains unchanged for this issue. This Amendment becomes effective on 23 March 2000.\n\nBackground: Inspections mandated by Airworthiness Directives AD/DHC-8/51 and AD/DHC-8/55 have identified the need for an additional disbonding check of the skin panels on the horizontal stabilisers with serial numbers CAP 003 to CAP 050.\n\nAmendment 1 reflected the issue of AEROC 8.4.AC.12, Section 55-0013-1 Issue 2, which incorporates new test criteria for the horizontal stabiliser skin test coupons.\n\nAmendment 2 is issued to correct the Requirement 1 compliance to provide new test samples.\n\nThe original issue of this Airworthiness Directive became effective on 28 July 1999.\n\n![](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 14 February 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 23 February 2000.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: addressing horizontal stabiliser skin disbonding in specific DHC-8 aircraft. Amendment 2 is a technical correction to Amendment 1 regarding test sample procedures, not an expansion of scope. The directive maintains the same applicability (serial numbers CAP 003-CAP 050) and fundamental safety objective as the original July 1999 issue."},"complexity_factors":["Multiple cross-references to external technical documents (Bombardier Repair Drawing RD8-55-669 Issue 3, PSM 1-8-7, AEROC 8.4.AC.12 Section 55-0013-1 Issue 2, Transport Canada AD CF-99-15 R1)","Conditional compliance pathways dependent on third-party test results (three different outcomes based on Bombardier's notification)","Specific serial number range applicability requiring physical inspection of component data plates","Nested timing requirements (absolute deadline of 24 April 2000 for sampling, plus 30-day trigger for action if no response received)","Technical aviation terminology requiring domain knowledge (bond integrity, disbonding, test coupons, horizontal stabiliser)","Revocation and replacement of previous amendment (Amendment 1) creating version control complexity"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of Bombardier DHC‑8 aircraft with horizontal stabilisers serial CAP 003–CAP 050 to cut small skin samples and send them to Bombardier for bond‑strength testing by 24 April 2000. If samples fail — or if no results are received within 30 days — the stabiliser must be repaired or replaced before flight; passing samples return the part to normal inspections. It’s Amendment 2, correcting earlier instructions and addressing a potential structural‑integrity risk from stabiliser disbonding."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 2 corrects the Requirement 1 compliance instructions to provide new test samples and incorporates updated test criteria, but does not broaden applicability (still limited to horizontal stabilisers serial CAP 003–CAP 050). The change is procedural—adjusting test sampling and acceptance criteria—rather than expanding which aircraft are subject to the directive."},"complexity_factors":["Technical testing and physical work: cutting, marking and shipping of test coupons per Bombardier Repair Drawing RD8‑55‑669 Issue 3.","Decision dependence on manufacturer: Bombardier test results and notifications determine mandatory repair/replace actions and return to inspection (Requirement 1 and Compliance section).","Serial‑number tracing: operators may need to inspect the stabiliser data plate and component records to identify affected units (Applicability note).","Conditional compliance paths: different outcomes (repair/replace before further flight, or return to PSM 1‑8‑7 inspection program) depend on test results or lack of notification within 30 days (Compliance).","Cross‑referenced documents: the AD relies on external documents and criteria (AEROC 8.4.AC.12 Section 55‑0013‑1 Issue 2; RD8‑55‑669 Issue 3; PSM 1‑8‑7; Transport Canada AD CF‑99‑15 R1), increasing coordination and verification burden.","Regulatory timetables: a fixed sample submission deadline (before 24 April 2000) and pre‑flight repair requirement if samples fail increases scheduling pressure."],"plain_english_summary":"This AD requires operators of DHC‑8 aeroplanes fitted with horizontal stabilisers serial CAP 003–CAP 050 to cut and mark small bond‑test samples from the stabiliser skin per Bombardier Repair Drawing RD8‑55‑669 Issue 3, send those samples to Bombardier for testing, and then either repair/replace the stabiliser or return it to the normal inspection programme depending on Bombardier’s test result. Bombardier’s notification drives mandatory repair/replacement before further flight; sample submission deadline is before 24 April 2000. Operators carry the work and cost burden."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2","history":"/api/acts/ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2/history","analysis":"/api/acts/ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2/analysis","conflicts":"/api/acts/ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2/conflicts","importantCases":"/api/acts/ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2/important-cases","documents":"/api/acts/ad-dhc-8-63-amdt-2-horizontal-stabiliser-skin-disbonding-follow-up-2/documents"}}