{"id":"F2006B06341","name":"AD/PROCTOR/2(Re-Issue) - Rear Fuselage Drain Holes - Modification","slug":"ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47533,"registerId":"commonwealth-F2006B06341-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PROCTOR/2(Re-Issue) - Rear Fuselage Drain Holes - 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)  Percival Proctor Series Aeroplanes\n\n \n\nAD/PROCTOR/2\n\n(Re-Issue)\n\n\nRear Fuselage Drain Holes - Modification 6/50\n\n \n\nApplicability: All Mk. I, Mk. II and Mk. III as indicated, operated in other than Class 1. Requirement:              1. Percival Mod. Nos. 210 (Mk.I) and 676 (Mk’s II and III), or\n\n2. DCA/PROCTOR/2, or 3. A.N.O. 105.1.26.0.2.2.\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This entry is labelled a re-issue but the document text presents a single, unchanged set of applicability and compliance requirements. Based on the re-issued text provided, the scope — which aircraft are affected and the requirement to implement one of the listed modifications forthwith — is not altered in this re-issue."},"complexity_factors":["Narrow technical scope (single modification subject: rear fuselage drain holes) reduces conceptual complexity.","Immediate compliance requirement (\"Forthwith\") raises operational complexity for scheduling and downtime.","Multiple alternative compliance routes (two Percival Mod numbers and two referenced documents) require cross-referencing and a choice by operators.","Dependence on external technical documents (DCA/PROCTOR/2 and A.N.O. 105.1.26.0.2.2) introduces administrative and interpretive steps.","Reference to operational classification (\"operated in other than Class 1\") requires operators to determine applicability for each aircraft."],"plain_english_summary":"This AD mandates an immediate modification of the rear fuselage drain‑hole arrangement on Percival Proctor Mk I, II and III aircraft when operated other than Class 1. Operators/owners must, forthwith, complete one of three prescribed compliance options (two Percival mod numbers or the referenced documents), fund and arrange the work, and may choose the method that best fits their technical and operational constraints. Mandatory timing makes prompt scheduling and certified maintenance capability essential."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a re-issued Airworthiness Directive maintaining its original narrow scope: a specific structural modification for a specific vintage aircraft type (Percival Proctor). The 'Re-Issue' notation suggests republication for clarity or administrative purposes rather than expansion of scope."},"complexity_factors":["Extremely short document (under 200 words)","Only 3 defined modification references (Percival Mod. Nos. 210/676, DCA/PROCTOR/2, A.N.O. 105.1.26.0.2)","Single applicability condition (aircraft model + operational class exclusion)","Simple binary compliance requirement (do one of three things)","No nested exceptions, cross-references to other legislation, or conditional logic","Straightforward imperative language ('Forthwith', 'Requirement')"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **Percival Proctor Series aeroplanes** (specifically Mk. I, Mk. II, and Mk. III models) that are **not** operated in 'Class 1' (which typically means private/recreational use rather than commercial air transport).\n\n**What it requires:**\nOwners and operators must modify the rear fuselage drain holes on these aircraft. This modification prevents water accumulation that could cause corrosion or structural damage.\n\n**How to comply:**\nYou must carry out **one** of the following approved modifications:\n- **Percival Modification No. 210** (for Mk. I aircraft) or **No. 676** (for Mk. II and III), **or**\n- **DCA/PROCTOR/2** (an alternative approved design), **or**\n- **A.N.O. 105.1.26.0.2.2** (referencing an older Air Navigation Order).\n\n**When:**\n**Forthwith** — meaning immediately, without delay.\n\n**Why it matters:**\nDrain holes allow water to escape from the aircraft structure. If blocked or improperly designed, water traps can cause rust, weakening the airframe and potentially creating serious safety risks. This AD ensures these vintage aircraft remain safe to fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification","history":"/api/acts/ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification/history","analysis":"/api/acts/ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification/analysis","conflicts":"/api/acts/ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification/conflicts","importantCases":"/api/acts/ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification/important-cases","documents":"/api/acts/ad-proctor-2-re-issue-rear-fuselage-drain-holes-modification/documents"}}