{"id":"F2006B03489","name":"AD/BAe 146/39 - APU Power Supplies","slug":"ad-bae-146-39-apu-power-supplies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43043,"registerId":"commonwealth-F2006B03489-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/39 - APU Power Supplies","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)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\nAD/BAe 146/39 APU Power Supplies 3/92\n\nCANCELLED.\n\n \n\nBackground: This Directive is cancelled due to an error in the applicability statement.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation notice for a specific airworthiness directive. It does not represent an expansion of scope; rather, it represents the termination of a regulatory instrument due to a technical error in its original drafting. The scope has effectively reduced to zero as the directive no longer applies."},"complexity_factors":["Document is only 4 substantive lines of text","No defined terms section","No cross-references to other legislation","No conditional logic or procedural requirements","Single administrative action (cancellation) with brief explanatory note","Essentially a placeholder or tombstone notice indicating a revoked instrument"],"plain_english_summary":"This is a **cancelled airworthiness directive** for British Aerospace BAe 146 series aircraft.\n\n**What it was:** An Airworthiness Directive (AD) is a mandatory safety notice issued by the Civil Aviation Safety Authority (CASA) that requires aircraft owners or operators to fix specific safety problems. This particular directive (numbered AD/BAe 146/39, originally issued in March 1992) related to the **APU (Auxiliary Power Unit)** power supplies on BAe 146 aeroplanes. The APU is a small engine at the back of the aircraft that provides electricity and air conditioning when the main engines are off.\n\n**What happened:** The directive has been **cancelled** because there was an **error in the applicability statement** — essentially, CASA made a mistake about which specific aircraft or parts this rule actually applied to.\n\n**Why it matters:** When an AD is cancelled due to an error, it means the original safety instruction no longer applies. Aircraft operators no longer need to comply with this specific directive, though they must still follow any replacement or corrected directives that may have been issued separately."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The instrument removes (cancels) the legal force of AD/BAe 146/39 (APU Power Supplies) as issued. The original directive would have applied to British Aerospace BAe 146 Series aeroplanes; this notice states that the directive is cancelled due to an error in the applicability statement, thereby withdrawing the previously intended applicability. The document does not state whether a corrected directive will replace it or provide transitional instructions."},"complexity_factors":["Extremely short instrument: contains only cancellation statement and a one-line background reason.","No technical or procedural requirements, schedules, or compliance steps included.","No dates beyond the original identifier (3/92) and no transitional or replacement instructions.","Limited applicability language (only names BAe 146 Series) but cancellation removes operative scope.","Absence of supporting detail increases practical ambiguity despite low textual complexity (e.g., no guidance on interim measures or reissue)."],"plain_english_summary":"This instrument formally cancels AD/BAe 146/39 (APU Power Supplies), removing that previously issued airworthiness directive as it applied to British Aerospace BAe 146 Series aeroplanes. The Civil Aviation Safety Authority records the cancellation, citing an error in the original applicability statement. Effectively any mandatory obligations from that AD are withdrawn by this notice, though the document does not state whether a corrected directive or interim instructions will follow."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-39-apu-power-supplies","history":"/api/acts/ad-bae-146-39-apu-power-supplies/history","analysis":"/api/acts/ad-bae-146-39-apu-power-supplies/analysis","conflicts":"/api/acts/ad-bae-146-39-apu-power-supplies/conflicts","importantCases":"/api/acts/ad-bae-146-39-apu-power-supplies/important-cases","documents":"/api/acts/ad-bae-146-39-apu-power-supplies/documents"}}