{"id":"F2006B08899","name":"AD/DH 82/13 Amdt 1 - Introduction of Increased Strength Seat Harness Transverse Cable","slug":"ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52410,"registerId":"commonwealth-F2006B08899-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 82/13 Amdt 1 - Introduction of Increased Strength Seat Harness Transverse Cable","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\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/DH 82/13 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\nDe Havilland DH 82 (Tiger Moth) Series Aeroplanes\n\nAD/DH 82/13\n\nAmdt 1\n\n  \n\nIntroduction of Increased Strength Seat Harness Transverse Cable\n\n  \n4/2001\n\nApplicability: All DH 82 Series aircraft.\n\nRequirement: Replace existing harness transverse cables with cables of higher strength in accordance with British Aerospace Mandatory TNS CT(Moth) No 37 Issue 2 dated 1 December 2000. Alternate cables of equivalent or greater strength to those required by TNS CT(Moth) No 37 Issue 2 are acceptable.\n\nNote: UK CAA AD 002-10-2000 refers.\n\nCompliance: Before 22 February 2002. Unless already accomplished.\n\nThis amendment becomes effective on 19 April 2001.\n\nBackground: Investigation in UK has shown that, under overload conditions, the initial point of failure of the harness assembly or attachments can be the shoulder harness transverse cable. This failure will result in total loss of upper body restraint for the seat occupant. The UK Air Accident Investigation Branch specifically recommended that the existing cable be replaced by one of higher strength.\n\nAmendment 1 has been raised to permit alternate cables to those specified in the requirement document to be used.\n\nThe original issue of this Airworthiness Directive became effective on 22 February 2001.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 26 February 2001\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 March 2001.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"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":2,"scope_assessment":{"changed":true,"description":"Amendment 1 relaxes the original specification by allowing alternate cables of equivalent or greater strength instead of mandating only the cable specified in TNS CT(Moth) No 37 Issue 2 (Requirement; \"Alternate cables... are acceptable\"). Applicability, the safety rationale (UK investigation), and the compliance deadline remain the same (Applicability; Background; Compliance)."},"complexity_factors":["Single, prescriptive corrective action (replace transverse cable) — low procedural complexity (Requirement).","Applies to a defined, small fleet: all DH 82 series aircraft (Applicability).","Fixed compliance deadline creates a clear timeline for action (Compliance: before 22 February 2002).","References an external technical document (British Aerospace Mandatory TNS CT(Moth) No 37 Issue 2) — requires access and technical interpretation.","Permits alternate cables of equivalent or greater strength, which introduces an assessment step to verify equivalence.","Revocation of the prior AD and issuance under CAR 1998 subregulation 39.1(1) adds a formal regulatory step but no added procedural layers (Background/intro)."],"plain_english_summary":"This Airworthiness Directive requires all De Havilland DH 82 (Tiger Moth) aircraft to have their shoulder-harness transverse cable replaced with a higher‑strength cable by 22 February 2002, using the specification in British Aerospace TNS CT(Moth) No 37 Issue 2 or an alternate of equal/greater strength. It responds to a UK investigation that found the original cable can fail under overload and cause loss of upper‑body restraint; aircraft operators and maintainers must source and fit compliant cables by the deadline."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the AD. The change is minor and procedural—adding explicit permission for equivalent alternative cables rather than restricting operators to one specific manufacturer's part. The core safety purpose (replacing weak transverse cables) remains unchanged."},"complexity_factors":["Single, clearly defined applicability (all DH 82 Series aircraft)","One primary requirement with a straightforward alternative (equivalent or greater strength cables)","Single compliance deadline with simple exception (unless already accomplished)","Minimal cross-referencing (one British Aerospace technical document and one UK CAA AD mentioned in notes only)","No nested conditions, exceptions, or defined terms section","Short document (approximately 300 words)","Clear, sequential structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This CASA Airworthiness Directive requires all De Havilland DH 82 “Tiger Moth” operators to replace the transverse shoulder-harness cable with a stronger British Aerospace part (or an equivalent or stronger alternative). It fixes a known failure mode that can leave occupants without upper-body restraint in a crash. The replacement deadline was 22 February 2002; Amendment 1 explicitly permits equivalent cables."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable","history":"/api/acts/ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable/history","analysis":"/api/acts/ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable/analysis","conflicts":"/api/acts/ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable/conflicts","importantCases":"/api/acts/ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable/important-cases","documents":"/api/acts/ad-dh-82-13-amdt-1-introduction-of-increased-strength-seat-harness-transverse-cable/documents"}}