{"id":"F2006B07777","name":"Airworthiness Directives 2004 - Revocation and Remaking - British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50570,"registerId":"commonwealth-F2006B07777-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes","content":"Airworthiness Directives 2004\n\nI, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\nAuthority, acting under subregulation 39.001 (1) of the Civil\n\nAviation Safety Regulations 1998:\n\n(a) revoke the Airworthiness Directives mentioned in\n\nSchedule 1; and\n\n(b) make, as separate instruments, each Airworthiness\n\nDirective mentioned in Schedule 1 and attached.\n\n![](image.001.png)\n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority\n\n20 December 2004\n\nNote: Each attached Airworthiness Directive is being re-made in exactly the\n\nsame form as appears in the latest published edition of the Directive.\n\n  \nSchedule 1 Revocation and Remaking of\n\nAirworthiness Directives\n\nBritish Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes\n\nAD Name AD Number\n\nWing Bracing Strut Internal V Brace in Outer Wing AD/SA-TP/1\n\nHydraulic Valve - Strengthened Gland AD/SA-TP/2\n\nLift Strut Incorporating Multi Bolt Attachment for Stabilising Strut AD/SA-TP/3\n\nStabiliser Strut SA.B3.20.334 AD/SA-TP/4\n\nThrottle and CSU Controls AD/SA-TP/5\n\nLift Strut Steel Fittings AD/SA-TP/6\n\nThrottle and CSU Controls AD/SA-TP/7\n\nBolts on Undercarriage V Brace and Trunnion at Top of Oleo Leg AD/SA-TP/8\n\nSlat Jack P/N 4694 - Replacement with P/N 4477 AD/SA-TP/9\n\nMain Undercarriage Bracing Strut Shackles AD/SA-TP/10\n\nIce Guard on CSU Swivel Assembly AD/SA-TP/11\n\nElevator Port Control Column Installation AD/SA-TP/12\n\nBrake Unit P/N AH51417 in Lieu of P/N AH50743 AD/SA-TP/13\n\nProtection Strips on Lift Struts AD/SA-TP/14\n\nAxle Bracket and Sliding Tube Assemblies AD/SA-TP/15\n\nControl Column Inspection Hole AD/SA-TP/16\n\nFlap Jacks - Life Limitation AD/SA-TP/17\n\nBolts in Main Undercarriage, Wing Lift Struts and Tailplane Attachments AD/SA-TP/18 Amdt 2\n\nHeat Exchange Unit Intensifier Tube AD/SA-TP/19\n\nDrive Blocks on Dunlop Main Wheel AD/SA-TP/20\n\nPassenger Lap Straps AD/SA-TP/21\n\nMain Lift Strut AD/SA-TP/22 Amdt 2\n\nStructural Components Fatigue Lives AD/SA-TP/23 Amdt 1\n\nEngine Nacelle Upper Longerons AD/SA-TP/24\n\nMain Fuel Tank Vent Pipes AD/SA-TP/25\n\nFlap Operating System AD/SA-TP/26 Amdt 1\n\nAuto-Pilot Emergency Cut Out Control AD/SA-TP/27\n\nWing Lift Strut Fretting AD/SA-TP/28","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument does not broaden or narrow the substantive safety requirements of the listed Airworthiness Directives. It revokes and re-makes the same ADs \"in exactly the same form\" as the latest published editions, so the operational and compliance scope remains unchanged. The change is administrative: replacing existing instrument entries with separately re-made instruments that mirror the published AD texts."},"complexity_factors":["Short instrument: single-page administrative instrument","One statutory power invoked: subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998","Schedule lists 28 Airworthiness Directives by title and AD number","No substantive amendment language—each AD is re-made in the same form as latest published edition","Minimal conditional logic and no nested exceptions or new defined terms"],"plain_english_summary":"**What this instrument does**\n\n- This is an administrative decision by a delegate of the Civil Aviation Safety Authority (CASA) using the power in subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998.\n- It formally revokes a list of Airworthiness Directives (ADs) that apply to British Aerospace (Scottish Aviation) Twin Pioneer series aeroplanes and immediately re-issues (re-makes) each of those ADs as separate legal instruments. The Schedule lists 28 ADs by title and AD number (for example, \"Wing Bracing Strut Internal V Brace in Outer Wing AD/SA-TP/1\" and \"Wing Lift Strut Fretting AD/SA-TP/28\").\n- The instrument states each re-made AD is in exactly the same form as appears in the latest published edition of the Directive.\n\n**Who this affects**\n\n- Owners and operators of British Aerospace (Scottish Aviation) Twin Pioneer series aircraft.\n- Aircraft maintenance organisations and licensed aircraft engineers who must comply with AD-mandated inspections, repairs and parts replacements.\n- Aircraft registrars and certification staff who keep regulatory records and must track the current legal instruments.\n\n**Why it matters (mechanics, not policy)**\n\n- Airworthiness Directives are mandatory safety requirements. Revoking and re-making ADs preserves their force as current legal instruments while giving each AD its own separate instrument identity.\n- Mechanically, this does not change the substantive requirements of the ADs (the text is re-made in the same form). The likely immediate effects are administrative: operators must ensure they apply the re-made AD instruments and keep records referring to the current instrument references.\n\n**Claimed purpose and practical test of that claim**\n\n- The instrument explicitly claims the ADs are re-made \"in exactly the same form as\" the latest published editions. If true, the practical effect is continuity: no new maintenance tasks or compliance standards are imposed beyond existing AD text. The primary benefit is administrative clarity and up-to-date instrument status (the legal instrument on the statute/registry matches the published edition).\n\n- Costs and trade-offs: the move is predominantly administrative. It creates small compliance costs for operators and maintainers who must check that they are working to the re-made instrument numbers and may have to update manuals, maintenance logs, or compliance filings. There is limited implementation risk if the re-made instruments or their attachments are not distributed or recorded correctly, which could cause temporary confusion over which instrument to follow.\n\n- Incentives and who pays: CASA (via its delegate) decides to revoke and re-make; the recurring costs fall on aircraft operators and maintenance organisations (time to update records and confirm instrument references). The safety requirements themselves (inspections, parts replacements) remain the operator’s cost of compliance.\n\n**Concrete mechanics and discretion**\n\n- Authority used: subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 gives CASA the power to issue ADs; the delegate exercises that power to revoke and re-make the listed ADs.\n- The Schedule lists the AD titles and AD numbers that are revoked and re-made. Because the text is not altered, the substantive obligations remain governed by the re-made instruments.\n\n**Potential unintended consequences and implementation issues**\n\n- Short-term record-keeping confusion if registries, operators and maintenance organisations do not synchronise references to the re-made ADs.\n- If the attachments (the re-made AD instruments) are not published or distributed promptly, there is a transient legal risk about which instrument is current. The text aims to avoid this by stating each AD is re-made in the same form as the latest published edition.\n\n**Bottom line**\n\n- This instrument is an administrative re-issuance of 28 ADs affecting Twin Pioneer aircraft. It does not change the substantive safety requirements but updates the legal form/identity of those ADs. Operators must check and, if necessary, update records to reference the re-made instruments (see subregulation 39.001(1) and Schedule 1)."},"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":3,"scope_assessment":{"changed":false,"description":"The legislation performs exactly the function described in its title — revoking and remaking specific Airworthiness Directives for one aircraft type. There is no scope creep; it is a narrow, technical administrative instrument with no expansion beyond its stated purpose."},"complexity_factors":["Very short instrument (under 500 words)","Only one substantive operative provision (subregulation 39.001(1)) cited as the power source","No defined terms section — relies entirely on external references to the Civil Aviation Safety Regulations 1998","Simple binary structure: revoke list in Schedule 1, then re-make as separate instruments","No conditional logic, exceptions, or nested provisions","Tabular schedule is purely descriptive (lists AD names and numbers) with no legal operative content","Heavy reliance on external documents (the attached ADs themselves are not reproduced in the legislative text)"],"plain_english_summary":"CASA revokes 28 existing Airworthiness Directives for the British Aerospace (Scottish Aviation) Twin Pioneer and re‑issues each one as a separate legal instrument. It’s a housekeeping move to unbundle a 2004 composite instrument into individual ADs, making them easier to locate and manage.\n\nThe substantive safety requirements remain unchanged; this affects Twin Pioneer owners/operators, maintenance engineers, and regulators for administrative clarity."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-british-aerospace-scottish-aviation-twin-pione/documents"}}