{"id":"F2006B07825","name":"Airworthiness Directives 2004 - Revocation and Remaking - De Havilland DHC-1 (Chipmunk) Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50724,"registerId":"commonwealth-F2006B07825-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 - De Havilland DHC-1 (Chipmunk) 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\nDe Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\nAD Name AD Number\n\nTailplane Bracket Bolt - Locking AD/DHC-1/1\n\nEngine Mount Pick-Up Points - Modification AD/DHC-1/2\n\nFuel Line Cock to Filter - Replacement AD/DHC-1/3\n\nUndercarriage Torque Link Centre Hinge Joint - Modification AD/DHC-1/4\n\nFuel System - Modification AD/DHC-1/5 Amdt 2\n\nEngine Mount Pick-Up Bolt - Inspection AD/DHC-1/6\n\nTailplane Attachment Lugs and Bulkhead - Inspection AD/DHC-1/7\n\nFairey-Reed Propeller - Spinner Removal AD/DHC-1/8\n\nRudder Torque Tube Flange - Inspection AD/DHC-1/9\n\nSuperseded by AD/DHC-1/15 AD/DHC-1/10\n\nElevator Trim Tab Cable - Inspection AD/DHC-1/11\n\nWing Spar Booms and Centre Section - Fatigue Life Limitation AD/DHC-1/12 Amdt 6\n\nFlap Return Spring/Flap Check Cable AD/DHC-1/13\n\nFlap Hinge Arms - Inspection and Modification AD/DHC-1/14\n\nTail Landing Gear and Lower Surface of Tailplane - Inspection and Modification AD/DHC-1/15\n\nTailwheel Yoke Attachment Bolt - Inspection AD/DHC-1/16\n\nCANCELLED AD/DHC-1/17\n\nFuselage Centre Top Structure - Inspection and Modification AD/DHC-1/18\n\nFlap Layshaft and Operating Cam AD/DHC-1/19 Amdt 1\n\nCANCELLED AD/DHC-1/20\n\nWing to Fuselage Attachment Links AD/DHC-1/21 Amdt 1\n\nTailplane Structure AD/DHC-1/22 Amdt 2\n\nCANCELLED AD/DHC-1/23\n\nEngine Mounting Frames - Inspection - CANCELLED AD/DHC-1/24\n\nWing Flap Inner Hinge Bracket and Reinforcing Channel AD/DHC-1/25 Amdt 1\n\nCANCELLED AD/DHC-1/26\n\nSeat Restraint Installations - Modification AD/DHC-1/27\n\nUndercarriage Mounting Casting AD/DHC-1/28 Amdt 8\n\nTailplane Attachment Fittings AD/DHC-1/29 Amdt 2\n\n  \nEngine Mount Upper Attachment Points/Reinforcing Plates AD/DHC-1/30 Amdt 1\n\nFin Rear Spar AD/DHC-1/31 Amdt 1\n\nFuselage Rear Bulkhead AD/DHC-1/32 Amdt 2\n\nTailplane Support Struts AD/DHC-1/33 Amdt 1\n\nShock Absorber Strut Piston Tube AD/DHC-1/34 Amdt 1\n\nEngine Mounting Frame Joints AD/DHC-1/35 Amdt 1\n\nFlap Operating Cables AD/DHC-1/36\n\nEngine Start Isolation Switch AD/DHC-1/37\n\nRe-Classification of Existing Modifications to Mandatory Status AD/DHC-1/38","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not change substantive scope or requirements: it revokes and re‑makes the listed ADs “in exactly the same form” as the latest published editions, so obligations on operators/owners remain unchanged. The action is administrative (re‑issuance under subregulation 39.001(1)) rather than a change of regulatory coverage."},"complexity_factors":["Procedural/administrative action only: revocation and re‑making of existing ADs in identical form (low substantive legal change)","Large number of referenced ADs (multiple entries and amendments listed), requiring cross‑checking attachments to see operative requirements","References to regulatory power: made under subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 (centralised delegate discretion)","Some ADs are marked CANCELLED or superseded in the schedule, so users must consult the attached instruments to determine current applicability","Operational compliance burden falls on private parties (owners/operators/maintenance organisations) to implement inspections/modifications specified in the ADs","Implementation risk from administrative re‑issuance (need to ensure no inadvertent gaps or numbering/confusion between old and re‑made instruments)"],"plain_english_summary":"This instrument revokes a list of existing Airworthiness Directives (ADs) for De Havilland DHC‑1 (Chipmunk) aeroplanes and re‑issues each AD as a separate, identical instrument in the form of the latest published editions. It is made by a Civil Aviation Safety Authority delegate under subregulation 39.001(1). It affects aircraft owners, operators and maintenance organisations, who remain legally obliged to follow the ADs and bear any inspection, modification or repair costs; the delegate decides and publishes the formal legal instruments."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument maintains identical scope to the original Airworthiness Directives. It is purely a machinery-of-government restructuring — converting a consolidated list of directives into separate instruments without altering their substantive content or coverage."},"complexity_factors":["Single operative provision with two clear actions (revocation and remaking)","No defined terms section — all terminology is standard aviation regulatory language","No conditional logic or nested exceptions","Schedule 1 is a simple table listing 38 ADs by name and number","Cross-references limited to subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 (a standard empowering provision)","Document is approximately 1 page of substantive content plus schedule","Note explicitly states directives are remade 'in exactly the same form' — no substantive changes to interpret"],"plain_english_summary":"CASA has revoked 38 existing Airworthiness Directives for De Havilland DHC‑1 Chipmunk aircraft and reissued them as 38 separate, standalone legal instruments.  \n\nThis affects Chipmunk owners and operators (clubs, private/warbird owners) but does not change any safety requirements — it’s purely legal housekeeping to make each AD clearer and easier to find."},"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/airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-dhc-1-chipmunk-series-aeroplanes/documents"}}