{"id":"F2006B07829","name":"Airworthiness Directives 2004 - Revocation and Remaking - DH 84 (Dragon) Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50737,"registerId":"commonwealth-F2006B07829-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 - DH 84 (Dragon) Series Aeroplanes","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 20.2\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n Airworthiness Directives 2004\n\n I, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\n Authority, acting under subregulation 39.001 (1) of the Civil\n\n Aviation Safety Regulations 1998:\n\n (a) revoke the Airworthiness Directives mentioned in\n\n Schedule 1; and\n\n (b) make, as separate instruments, each Airworthiness\n\n Directive mentioned in Schedule 1 and attached.\n\n \n\n ![](image.001.png)\n\n David Villiers\n\n Delegate of the Civil Aviation Safety Authority\n\n \n\n  20 December 2004\n\n Note:   Each attached Airworthiness Directive is being re-made in exactly the\n\n same form as appears in the latest published edition of the Directive.\n\n \n\n\n Schedule 1 Revocation and Remaking of\n\n Airworthiness Directives\n\n DH 84 (Dragon) Series Aeroplanes\n\n AD Name AD Number\n\n Fuel System Control - Modification AD/DH 84/1\n\n Undercarriage Strut - Inspection AD/DH 84/2 Amdt 2\n\n Flight Limitations - CANCELLED AD/DH 84/3\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument performs exactly the function stated in its title — revocation and remaking of specific Airworthiness Directives. There is no expansion beyond this narrow administrative purpose. The note explicitly confirms each directive is being remade 'in exactly the same form' as previously published, indicating no substantive change to the safety requirements themselves."},"complexity_factors":["Extremely short instrument (under 300 words)","Only 3 substantive items in Schedule 1","No defined terms section","No conditional logic or nested exceptions","Single cross-reference to Civil Aviation Safety Regulations 1998 (subregulation 39.001(1)) — standard enabling power","Straightforward administrative action (revoke and remake) with no policy changes"],"plain_english_summary":"This is a technical aviation safety instrument that **revokes and remakes** specific safety rules for a particular type of vintage aircraft.\n\n**What it does:**\n- **Revokes** (cancels) three existing Airworthiness Directives (safety rules) for **DH 84 (Dragon) Series Aeroplanes** — a 1930s-era British biplane still flown in Australia\n- **Remakes** two of those directives in identical form as separate legal instruments:\n  - **AD/DH 84/1**: Requires a modification to the fuel system controls\n  - **AD/DH 84/2 Amdt 2**: Requires inspection of the undercarriage (landing gear) strut\n- **Cancels without remaking** one directive:\n  - **AD/DH 84/3**: Flight limitations (previously cancelled, now formally revoked)\n\n**Who it affects:**\n- Owners and operators of DH 84 Dragon aircraft in Australia\n- Maintenance organisations servicing these aircraft\n- The Civil Aviation Safety Authority (CASA) itself\n\n**Why it matters:**\nAirworthiness Directives are **legally binding safety orders** issued when a design flaw, maintenance issue, or operational risk is discovered in an aircraft type. Compliance is mandatory — you cannot legally fly the aircraft until the required action is completed. This instrument is essentially **housekeeping**: consolidating and reissuing these safety rules as standalone instruments rather than keeping them bundled together under the 2004 umbrella directive. This ensures each safety requirement remains clearly enforceable and traceable."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Overall scope is mostly unchanged for the two ADs that are re-made in identical form (AD/DH 84/1 and AD/DH 84/2 Amdt 2), so substantive obligations they impose continue. However, scope has changed with respect to AD/DH 84/3: that Flight Limitations directive is recorded as CANCELLED (Schedule 1), which removes that particular regulatory requirement for affected aircraft. The instrument therefore preserves existing obligations in two cases while removing one obligation in another."},"complexity_factors":["Instrument is short and procedural: primarily revocation and re-issuance of existing ADs.","Relies on attachments (the re-made ADs) that are not reproduced in the text, requiring cross-checking with the published ADs to see substantive requirements.","Legal authority is a single delegated power (subregulation 39.001(1)), so substantive legal reasoning is limited but hinge on delegated discretion.","One listed AD is expressly cancelled, creating a substantive change that must be verified against prior obligations.","Possible administrative impact on record-keeping and citation of instruments despite no substantive change for re-made ADs."],"plain_english_summary":"What this instrument does (mechanically)\n\n- The delegate of the Civil Aviation Safety Authority (CASA) uses power under subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 to revoke certain airworthiness directives and to reissue them as separate instruments (see opening paragraph and subregulation citation).\n- The instrument lists the affected directives in Schedule 1. For the DH 84 (Dragon) series aeroplanes it: (a) remakes in separate instruments the directives titled \"Fuel System Control - Modification\" (AD/DH 84/1) and \"Undercarriage Strut - Inspection\" (AD/DH 84/2 Amdt 2); and (b) records that the directive \"Flight Limitations\" (AD/DH 84/3) is cancelled (see Schedule 1).\n- The instrument states that each attached Airworthiness Directive is being re-made in exactly the same form as appears in the latest published edition of the Directive (see the Note). The instrument is signed by the delegate, David Alan Villiers, dated 20 December 2004.\n\nWho is affected\n\n- Owners and operators of DH 84 (Dragon) series aeroplanes and organisations that perform maintenance or airworthiness compliance for those aircraft are the primary parties affected because the listed ADs set technical and operational requirements for those aeroplanes (see Schedule 1 for the ADs named).\n- CASA (through its delegate) is the decision maker that implements the change (see subregulation 39.001(1) reference and the signature block).\n\nWhy this matters (stated purpose and practical implications)\n\n- The instrument’s stated action is administrative: to revoke the listed ADs and re-make them as separate instruments in the same substantive form as the latest published editions (see Note). That means, per the instrument text, the substantive technical or operational requirements in the re-made ADs remain unchanged.\n\nPractical consequences, incentives and costs\n\n- Compliance obligations for the two re-made ADs (Fuel System Control and Undercarriage Strut) should remain substantively the same because they are being re-issued in the same form; therefore the direct compliance costs for operators arising from those ADs remain in place (see Note and Schedule 1).\n- The cancellation of the \"Flight Limitations\" AD (AD/DH 84/3) removes that particular regulatory requirement for holders of the affected aircraft; that reduces whatever compliance or operational constraint that AD previously imposed (see Schedule 1).\n- Administrative and transaction costs are incurred by the regulator to revoke and re-issue instruments and by regulated parties and record-keepers who must track the change in instrument form or numbering. Those are implementation costs implied by the act of revocation and reissuing (the instrument records the revocation and re-making process; see opening paragraph and Schedule 1).\n\nTrade-offs, discretion and implementation risk\n\n- Discretion: the action is taken by a CASA delegate under the specific regulatory power cited (subregulation 39.001(1)). The instrument therefore rests on delegated administrative discretion to revoke and reissue ADs (opening paragraph and signature block).\n- Because the re-made ADs are stated to be identical in substance to the latest published editions, the main trade-off is administrative: potential benefits of having each AD as a separate, stand-alone instrument (for filing, citation, or clarity) against the risk of temporary confusion among operators or record-keepers about which instrument version applies.\n- Implementation risk is mainly administrative (document-tracking, update of compliance records) rather than substantive change to technical obligations, except where an AD is cancelled (in this case AD/DH 84/3), which is a substantive change to regulatory obligations for affected aircraft (see Schedule 1).\n\nWho pays and who decides\n\n- Who decides: a CASA delegate acting under subregulation 39.001(1) decides to revoke and remake the ADs (see opening paragraph and subregulation reference).\n- Who pays: operators and maintenance organisations bear ongoing compliance costs for the re-made ADs because their requirements remain in force; they also bear any minor administrative costs of updating records. Cancellation of the Flight Limitations AD reduces obligations and therefore reduces costs for those operators who had been subject to that AD (see Schedule 1).\n\nSource citations\n\n- Delegation and authority: opening paragraph referencing subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998.\n- List of affected directives and cancellation: Schedule 1.\n- Statement that re-made ADs are identical to the latest published editions: the Note immediately following the signature block.\n- Signing and date: signature block naming David Alan Villiers, dated 20 December 2004."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-dh-84-dragon-series-aeroplanes/documents"}}