{"id":"F2006B09792","name":"AD/F28/57 - Frame 1600 Centre Bracket","slug":"ad-f28-57-frame-1600-centre-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54712,"registerId":"commonwealth-F2006B09792-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/57 - Frame 1600 Centre Bracket","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/57 Frame 1600 Centre Bracket 9/94\n\nCANCELLED.\n\n \n\nBackground: This Directive required inspection for fatigue cracks, and repair or replacement of the frame 1600 centre bracket. As the initial and repeat inspections for this bracket have since been incorporated in the F28 Structural Integrity Program (under Item 53-10- 21), which is covered by AD/F28/45, there is no longer a requirement for AD/F28/57.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The instrument removes a standalone requirement (AD/F28/57) that originally required inspection for fatigue cracks and repair or replacement of the frame 1600 centre bracket. Those inspection items have been incorporated into the F28 Structural Integrity Program (Item 53-10-21) and are now covered by AD/F28/45, so the separate AD/F28/57 requirement is cancelled (Background)."},"complexity_factors":["Short, narrowly focused instrument — document only records cancellation of a single AD (AD/F28/57) and gives a brief reason (Background).","Cross-reference to other material (Item 53-10-21 of the F28 Structural Integrity Program and AD/F28/45) requires readers to consult additional documents for full compliance details (Background).","Technical subject-matter (fatigue inspection and structural repair) is referenced but not described in technical detail here, shifting technical complexity to the referenced program/AD (Background).","Regulatory consequence is administrative (consolidation/cancellation) rather than introducing new procedures or standards, reducing interpretive complexity.","Limited stakeholder detail — affected parties are implied (operators, maintenance organisations), but the document does not specify implementation steps or transitional arrangements (Background)."],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Cancels Airworthiness Directive AD/F28/57, titled \"Frame 1600 Centre Bracket\" for Fokker F28 series aeroplanes. The document header lists the issuing authority as the Civil Aviation Safety Authority under the Civil Aviation Regulations 1998, Part 39 (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES). The AD itself is marked \"CANCELLED\" (AD/F28/57 Frame 1600 Centre Bracket 9/94 — CANCELLED).\n\n- Explains why: the inspection tasks (initial and repeat inspections for fatigue cracks of the frame 1600 centre bracket) and any required repair or replacement that AD/F28/57 enforced have been incorporated into the F28 Structural Integrity Program (under Item 53-10-21) and are now covered by AD/F28/45 (Background). Because those inspection items are already included in AD/F28/45, AD/F28/57 is no longer required (Background).\n\n**Who this affects**\n\n- Operators and owners of Fokker F28 series aeroplanes, and the maintenance organisations that perform inspections and repairs. The original AD required those inspections and remedial work (Background). The regulator responsible for issuing and cancelling the AD is the Civil Aviation Safety Authority (document header).\n\n**Why this matters (purpose claims and practical effects)**\n\n- Purpose as stated in the source: to remove a separate, standalone requirement (AD/F28/57) because the inspection items have been folded into an existing Structural Integrity Program and are now enforced under AD/F28/45 (Background).\n\n- Practical, source-grounded implications:\n  - Inspections and repair/replacement obligations are not eliminated; they remain part of the F28 Structural Integrity Program and are enforced under AD/F28/45 (Background). In other words, the maintenance requirement persists but its regulatory location has changed.\n  - The cancellation removes a separate AD to be complied with or tracked (AD/F28/57 is cancelled), and transfers the applicable inspection schedule to Item 53-10-21 within the Structural Integrity Program (Background).\n\n**Costs, incentives and trade-offs (source-grounded analysis)**\n\n- Who pays: the source shows that inspections and repairs were required by the cancelled AD, so aircraft operators and their maintenance providers bear the cost of performing inspections and any repair or replacement that the inspections identify (Background).\n\n- Compliance burden: the operational burden of performing inspections and repairs remains, because those tasks are now part of the F28 Structural Integrity Program and covered by AD/F28/45 (Background). The administrative burden of monitoring one separate AD (AD/F28/57) is removed; compliance tracking is consolidated under AD/F28/45 (Background).\n\n- Incentives and behaviour: the regulator has consolidated overlapping inspection requirements into a single program (Item 53-10-21 under the Structural Integrity Program) and cancelled the duplicate AD; this directs operators to follow the program referenced in AD/F28/45 rather than a standalone AD (Background). The source does not describe enforcement mechanisms beyond this transfer.\n\n- Trade-offs and opportunity costs: the source indicates a reduction in redundancy (AD/F28/57 removed because its tasks are incorporated elsewhere), but does not quantify costs saved or additional administrative tasks created by the consolidation (Background).\n\n- Implementation risk and bureaucratic discretion: the source states the administrative reason for cancellation (incorporation into the structural program) and thus shows regulator discretion in consolidating ADs; it does not describe any transitional measures, timelines, or risk assessments associated with that action (Background).\n\n**Effects on market-related factors (what the source does and does not say)**\n\n- What the source shows: compliance obligations for inspection/repair continue, but under a different AD/program (Background). The document does not describe effects on competition, prices, productivity, ownership, contract freedom, or the operational freedom of independent maintenance businesses.\n\n- What the source does not show: there is no explicit statement about changes to inspection intervals, technical standards, enforcement priorities, or cost-sharing arrangements; the only change recorded is the consolidation of inspection items into the Structural Integrity Program and cancellation of the standalone AD (Background).\n\n**Net mechanical takeaway**\n\n- Operators of Fokker F28 aircraft must continue to follow the inspection and repair requirements for the frame 1600 centre bracket, but those requirements are now enforced through the F28 Structural Integrity Program (Item 53-10-21) and AD/F28/45, not through AD/F28/57, which has been cancelled (Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation instrument that formally terminates a previous directive. It does not expand scope; it narrows it by removing redundant requirements that have been subsumed into a broader maintenance program."},"complexity_factors":["Single operative provision (cancellation)","No defined terms section","No cross-references to other legislation beyond a single mention of related directive AD/F28/45","Background explanation provided in plain narrative form","Extremely short document (under 200 words of substantive content)"],"plain_english_summary":"This is a **cancelled airworthiness directive** for Fokker F28 series aircraft. It previously required airlines to inspect a specific part (the \"frame 1600 centre bracket\") for fatigue cracks and repair or replace it if damaged. The directive has been cancelled because those inspection requirements are now covered by a broader structural integrity program (referenced as AD/F28/45). In practical terms: if you fly or maintain these aircraft, you no longer need to follow this specific directive, but you must follow the replacement program instead."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-57-frame-1600-centre-bracket","history":"/api/acts/ad-f28-57-frame-1600-centre-bracket/history","analysis":"/api/acts/ad-f28-57-frame-1600-centre-bracket/analysis","conflicts":"/api/acts/ad-f28-57-frame-1600-centre-bracket/conflicts","importantCases":"/api/acts/ad-f28-57-frame-1600-centre-bracket/important-cases","documents":"/api/acts/ad-f28-57-frame-1600-centre-bracket/documents"}}