{"id":"F2006B07853","name":"Airworthiness Directives 2004 - Revocation and Remaking - Enstrom F-28 Series Helicopters","slug":"airworthiness-directives-2004-revocation-and-remaking-enstrom-f-28-series-helicopters","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50814,"registerId":"commonwealth-F2006B07853-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 - Enstrom F-28 Series Helicopters","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\nEnstrom F-28 Series Helicopters\n\nAD Name AD Number\n\nRetirement Life - Critical Components AD/ENST 28/1 Amdt 5\n\nStabilizer Spar Attachment AD/ENST 28/2 Amdt 2\n\nCable Gauge/Circuit Protection Coordination - Modification AD/ENST 28/3\n\nMain Rotor Spindle - Inspection and Retirement - CANCELLED AD/ENST 28/4 Amdt 1\n\nMain Rotor Spindle - Inspection and Retirement - CANCELLED AD/ENST 28/5 Amdt 1\n\nPre-Certification Requirements - Modifications AD/ENST 28/6\n\nMain Rotor Transmission Attachment Bolts - Inspection and Replacement AD/ENST 28/7 Amdt 1\n\nFuselage Structure - Inspection AD/ENST 28/8\n\nMain Rotor Mast AD/ENST 28/9 Amdt 4\n\nTail Cone Attachment Bolts - Inspection and Replacement AD/ENST 28/10\n\nFuel Tank Vent - Modification AD/ENST 28/11\n\nTail Rotor Pitch Link Safety Washer - Replacement AD/ENST 28/12\n\nMain Rotor Hub Retention Lock Washer - Replacement AD/ENST 28/13\n\nUpper Swashplate Bearing - Inspection and Lubrication AD/ENST 28/14 Amdt 1\n\nTail Rotor Spindle and Drive Shaft - Inspection and Retirement AD/ENST 28/15 Amdt 2\n\nTail Rotor Pitch Link Retainer and Guide Bolt - Replacement AD/ENST 28/16\n\nWide Chord Tail Rotor Counterweights - Modification AD/ENST 28/17\n\nAlternator Field Cable Protection - Modification AD/ENST 28/18\n\nFuel Strainer Drain Valve - Modification AD/ENST 28/19\n\nMixture Control System Maintenance Checks and Modification AD/ENST 28/20\n\nTail Rotor Blade Grip - Inspection and Modification AD/ENST 28/21\n\nMain Rotor Transmission Mount Bolts - Inspection AD/ENST 28/22\n\nRAJAY Turbocharger and Fuel Nozzle Vent Line - Modification AD/ENST 28/23\n\nMain Rotor Retention Assembly - Inspection AD/ENST 28/24\n\nClutch Engagement Over Centre Lock Warning Light AD/ENST 28/25\n\nTail Rotor Drive Shaft Couplings AD/ENST 28/26 Amdt 2\n\nNarrow Chord Tail Rotor Forged Grips - Inspection AD/ENST 28/27\n\nClutch Engagement Handle Guard AD/ENST 28/28\n\nRotor Head Hub AD/ENST 28/29\n\n  \nTail Rotor Spindle AD/ENST 28/30 Amdt 2\n\nMain Rotor Transmission Clutch Assembly AD/ENST 28/31\n\nTail Rotor Gearbox AD/ENST 28/32 Amdt 1\n\nTail Rotor Drive Flexible Couplings AD/ENST 28/33\n\nMain Rotor Shaft AD/ENST 28/34\n\nInadvertent Trim Motor Operation AD/ENST 28/35\n\nLamiflex Bearings AD/ENST 28/36\n\nVoltage Regulator AD/ENST 28/37\n\nMain Rotor Hub Plates AD/ENST 28/38","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The legislation maintains its original scope precisely. This is a pure 'revoke and remake' instrument with no expansion of regulatory reach. The 38 Airworthiness Directives remain substantively identical to their previous versions, covering the same Enstrom F-28 helicopter models and the same safety-critical components. The exercise is procedural — ensuring legal continuity under the Civil Aviation Safety Regulations 1998 framework — rather than substantive."},"complexity_factors":["Simple, standardised administrative structure: single operative clause with two sub-paragraphs (revocation and remaking)","No substantive legal amendments — the directives are remade 'in exactly the same form'","Minimal conditional logic — only straightforward listing of instruments in Schedule 1","No defined terms section — relies on external definitions in Civil Aviation Safety Regulations 1998","Single cross-reference (subregulation 39.001(1) of CASR 1998) — standard enabling provision","Tabular schedule format makes the list of 38 directives readable but lengthy","No nested exceptions or complex temporal provisions"],"plain_english_summary":"This instrument formally revokes and remakes 38 existing Airworthiness Directives for Enstrom F‑28 helicopters, renewing them in their current form so they remain legally valid and enforceable. It’s a legal housekeeping exercise — it does not change the safety requirements but preserves their force.\n\nIt affects Enstrom F‑28 owners/operators, maintenance engineers, and CASA, and covers safety‑critical systems like rotors, structure, fuel, electrical, and drive components."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument does not change the substantive scope of the underlying Airworthiness Directives. It is an administrative revocation and re‑making of existing ADs in the same form as their latest published editions. The legal requirements imposed by those ADs remain unchanged by this instrument; any change to scope would require amendments to the text of the individual ADs themselves."},"complexity_factors":["Very short primary instrument: single operative paragraph revoking and re‑making listed ADs.","Invokes one legislative power: subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998.","Schedule lists 38 individual ADs (AD/ENST 28/1 to AD/ENST 28/38), some with amendment numbers — increases administrative scope but not legal complexity.","Two items in the Schedule are marked \"CANCELLED\", which may require checking publication history but does not add conditional logic within the instrument.","Each AD is re‑made \"in exactly the same form\" as the latest published edition — no new definitions, exceptions or cross‑referencing introduced here.","Complexity is concentrated in the attached AD texts themselves (not included here); this instrument is a simple administrative reissuance."],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- The delegate of the Civil Aviation Safety Authority (CASA) revokes a list of existing Airworthiness Directives (ADs) for Enstrom F‑28 series helicopters and then re‑issues each of those ADs as separate instruments in the same wording as the latest published editions. The power used is subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998. (See main text and Schedule 1.)\n\n**Who this affects**\n\n- Owners and operators of Enstrom F‑28 series helicopters.\n- Maintenance organisations, engineers and certifying staff who perform inspections, modifications, replacements or retirement of parts under those ADs.\n- Suppliers of parts and labour used to comply with the ADs.\n- CASA and its delegated officers responsible for oversight and enforcement.\n\n**Why it matters**\n\n- Airworthiness Directives are legally enforceable requirements that mandate safety actions (inspections, repairs, part replacements, retirements, or modifications) to correct identified unsafe conditions on aircraft.\n- Re‑issuing the ADs as separate instruments preserves their legal force while changing their administrative form. The instrument expressly says each AD is being re‑made \"in exactly the same form as appears in the latest published edition of the Directive.\" That means no substantive change to the technical requirements is being made by this instrument; it is an administrative reissue. (See instrument text: re‑making clause and Schedule 1.)\n\n**Who pays and who decides**\n\n- CASA (through its delegate) decides to revoke and re‑make the ADs. The delegate acts under a specific regulation (subregulation 39.001(1) CASR 1998).\n- Costs of compliance — parts, labour, aircraft downtime and record‑keeping — fall on the aircraft owners/operators and their maintenance suppliers as required by each AD.\n\n**What behaviour changes**\n\n- Practically none in terms of technical compliance: affected parties must continue to follow the AD requirements because the instrument re‑issues those ADs unchanged.\n- Administrative behaviour could change: operators and maintainers will need to rely on the newly issued separate instruments as the operative legal documents and ensure records reference the re‑made ADs.\n\n**Practical effects, trade‑offs and implementation notes**\n\n- Administrative clarity: remaking ADs as separate instruments may simplify citation, record‑keeping or legal form. The instrument is explicit that the content of each AD is not being altered.\n- Compliance costs remain tied to the substantive requirements of the individual ADs (inspections, replacements, retirements, modifications). Those costs are borne by operators/owners and concentrated on the affected fleet, while the safety benefits are concentrated on the users and the public that rely on safe operation.\n- Implementation risk is mainly administrative: ensuring the re‑made ADs are correctly published, indexed, and linked to maintenance records so there is no uncertainty about which instrument is operative. The instrument does not change technical compliance dates or requirements; any such change would need to appear in the individual AD texts themselves.\n\n**Notable details in the Schedule**\n\n- The Schedule lists 38 ADs for the Enstrom F‑28 series (AD/ENST 28/1 through AD/ENST 28/38), some showing amendment numbers. Two entries in the list (AD/ENST 28/4 and AD/ENST 28/5) are marked \"CANCELLED\" in the schedule — the instrument nonetheless lists them for revocation and re‑making as part of the administrative exercise.\n\n**Source and limits of this analysis**\n\n- This is a mechanical, source‑based description. The instrument itself states it is re‑making the ADs without substantive change; any substantive effect would only exist if the attached re‑made ADs differ from earlier texts, which the instrument denies."},"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-enstrom-f-28-series-helicopters","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-enstrom-f-28-series-helicopters/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-enstrom-f-28-series-helicopters/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-enstrom-f-28-series-helicopters/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-enstrom-f-28-series-helicopters/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-enstrom-f-28-series-helicopters/documents"}}