{"id":"F2006B02422","name":"AD/ANSON/3 - Boost Gauge - Modification","slug":"ad-anson-3-boost-gauge-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41665,"registerId":"commonwealth-F2006B02422-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/3 - Boost Gauge - Modification","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)  Avro Anson and Avro 19 Series Aeroplanes\n\n \n\nAD/ANSON/3 Boost Gauge - Modification 2/51\n\nApplicability: Anson.\n\n \n\nDocument: 1. A.V. Roe Anson Mod. No. 122; or\n\n \n\n2. RAAF Anson Order No. 4; or 3. ANO 105.1.31.4.5.3.\n\nCompliance: Forthwith.\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":3,"scope_assessment":{"changed":false,"description":"The text of the Directive sets a clear, narrow scope — modification of the boost gauge on Avro Anson aeroplanes — and provides no indication within the provided material that this scope has been altered from an earlier intent. The AD assigns compliance to operators of Anson aircraft and specifies three alternative source documents to be followed, with immediate effect (Applicability; Document: 1–3; Compliance: Forthwith)."},"complexity_factors":["Mandatory compliance by reference to three external documents rather than containing technical steps in the AD itself (Document: 1–3).","Immediate compliance requirement (\"Forthwith\") increases urgency and scheduling pressure (Compliance: Forthwith).","Narrow applicability (only Avro Anson aeroplanes) reduces breadth but concentrates affected parties (Applicability: Anson).","Lack of stated rationale or detail in the AD increases reliance on the referenced documents and on operator/regulator interpretation.","Regulatory enforcement is binary (comply or seek approved alternative), leaving little operational discretion without regulator approval."],"plain_english_summary":"### What this instrument does\n\nThis Airworthiness Directive orders that the boost gauge installation or arrangement on Avro Anson aeroplanes be modified. The directive requires operators to follow one of three specific source documents when carrying out the work: A.V. Roe Anson Mod. No. 122; RAAF Anson Order No. 4; or ANO 105.1.31.4.5.3. (See: Document list.) The obligation to comply is immediate — the Directive says \"Forthwith.\" (See: Compliance: Forthwith.)\n\n### Who it affects\n\n- Owners and operators of Avro Anson aircraft (Applicability: Anson). They are the parties who must have the modification carried out and certified.\n\n### How it works mechanically\n\n- The Directive does not include the technical steps in its text. Instead, it points to one of three external documents that contain the modification instructions (Document: 1–3). An operator must obtain the relevant referenced document and perform the modification described there.\n\n### Who pays and who decides\n\n- Payment: The owner/operator pays for parts, labour and any associated downtime needed to carry out the modification. The Directive itself does not specify funding arrangements. (See: Document list and Compliance.)\n- Decision and enforcement: The Civil Aviation Safety Authority issues the Directive as part of the Schedule of Airworthiness Directives; compliance is mandatory once the AD is published. (Header: Schedule of Airworthiness Directives.)\n\n### Behaviour changes and immediate effects\n\n- Operators must arrange for the boost gauge modification to be carried out without delay, using one of the referenced documents as the technical standard. This will typically mean scheduling maintenance, procuring parts (if specified in the referenced document), and recording the work in maintenance logs.\n\n### Practical trade-offs, burdens and implementation notes\n\n- Administrative/technical burden: The AD is short on technical detail and prescribes compliance by reference, so operators must locate and follow the specified modification documents. That creates extra steps compared with an AD that includes full instructions.\n- Financial and opportunity cost: Costs are borne by the owner/operator (parts, mechanic hours, and aircraft downtime). The AD’s immediate compliance requirement can increase scheduling pressure and short-term operational disruption. (See: Compliance: Forthwith.)\n- Discretion and enforcement: The AD prescribes the result (modification according to the named documents) and sets no technical variance or alternative method in the published text. Any deviation would require formal approval or an alternative method of compliance from the regulator. The AD itself leaves choice to the operator only in which of the three referenced documents to follow. (See: Document: 1–3.)\n- Implementation risk: Because the AD does not include the technical procedure, there is reliance on the completeness and applicability of the referenced documents. If the referenced documents differ or are not readily available, that can delay compliance or create ambiguity about the correct procedure.\n\n### Source-cited provisions\n\n- Applicability: \"Anson.\" (Applicability)\n- Modification documents: \"1. A.V. Roe Anson Mod. No. 122; or 2. RAAF Anson Order No. 4; or 3. ANO 105.1.31.4.5.3.\" (Document)\n- Timing: \"Compliance: Forthwith.\" (Compliance)\n\nNo explicit problem statement or technical rationale is included in the text provided; the AD simply prescribes the modification and immediate compliance by reference to the named documents."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue Airworthiness Directive from 1951 (indicated by '2/51' in the reference number). It addresses one specific technical modification to one specific aircraft type. There is no evidence of scope creep; it remains precisely targeted at the boost gauge modification requirement as originally issued."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implicitly referenced ('forthwith' — immediate compliance)","No cross-references to other legislation beyond the three alternative technical documents","Simple binary applicability (applies to 'Anson' aircraft — no conditional exceptions)","Single compliance requirement with three alternative implementation pathways","No nested conditions, exceptions, or temporal phasing"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for **Avro Anson aircraft**.\n\n**What it does:**\n- Requires owners/operators of Anson aeroplanes to modify the **boost gauge** (an instrument that measures engine supercharger pressure) according to specific technical documents.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains an **Avro Anson** aircraft in Australia.\n\n**What must be done:**\nThe modification must be carried out **\"forthwith\"** (immediately — no grace period). The work must follow one of these three approved technical documents:\n- A.V. Roe Modification No. 122 (from the original manufacturer); or\n- RAAF Anson Order No. 4 (Royal Australian Air Force technical order); or  \n- ANO 105.1.31.4.5.3 (an Air Navigation Order reference).\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. Non-compliance means the aircraft cannot legally fly. This particular AD addresses a specific technical issue with the boost gauge system — likely a safety-critical instrument for engine management in these vintage military aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-3-boost-gauge-modification","history":"/api/acts/ad-anson-3-boost-gauge-modification/history","analysis":"/api/acts/ad-anson-3-boost-gauge-modification/analysis","conflicts":"/api/acts/ad-anson-3-boost-gauge-modification/conflicts","importantCases":"/api/acts/ad-anson-3-boost-gauge-modification/important-cases","documents":"/api/acts/ad-anson-3-boost-gauge-modification/documents"}}