{"id":"F2006B09030","name":"AD/DHC-2/13 - Wing - Inspection and Modification","slug":"ad-dhc-2-13-wing-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52720,"registerId":"commonwealth-F2006B09030-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-2/13 - Wing - Inspection and Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nDHC-2 (Beaver) Series Aeroplanes\n\nAD/DHC-2/13 Wing - Inspection and Modification 3/66 Applicability: All models which are, or have at any time been, engaged in agricultural operations. Requirement: 1. Inspection:\n\nCarry out an internal inspection for cracking of the wing lower surface in the region of Rib Station 110 (Wing Station 137). Pay particular attention to:\n\n    (a) the wing skin at the outboard rivet line of the chordwise skin joint for a distance of 10 inches forward and aft of the spar; and\n\n    (b) the lower aft flange of the spar and the spar boom on the lower forward face of the spar.\n\nUse visual and fluorescent penetrant methods for carrying out this inspection. If cracks are discovered the wing shall be repaired to an approved repair scheme.\n\n2. Modification (applicable only to wings which are not cracked in the area described in para. 1). Reinforce the wing lower surface in accordance with DH Canada Drawing C2Z-3111.\n\nNote: In order to carry out the inspection and modification it will be necessary to remove portions of the upper wing skin. Hawker De Havilland Australia should be contacted for advice on this and for copies of the reference drawing.\n\nCompliance: Before each wing attains a total of 10,000 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a vintage airworthiness directive (original reference 3/66 suggests 1966 origin) that remains focused on its original narrow purpose: addressing a specific structural fatigue issue in DHC-2 Beaver wings used in agricultural operations. The scope has not expanded beyond this specific safety issue."},"complexity_factors":["Single specific aircraft type (DHC-2 Beaver) with narrow applicability (agricultural operations only)","Contains one technical drawing reference (C2Z-3111) and one specific structural location (Rib Station 110/Wing Station 137)","Simple conditional structure: inspect → if cracked then repair, if not cracked then modify","Single compliance deadline (10,000 hours time in service)","Minimal defined terms (uses standard aviation terminology without extensive definitions)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Short length (approximately 200 words of substantive content)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of DHC‑2 Beaver aircraft that have ever been used for agricultural work to inspect the lower wing near Rib Station 110 for cracks and either repair or fit a strengthening kit. Inspections (visual and fluorescent penetrant) must occur before 10,000 total hours; cracked wings get approved repairs, crack‑free wings must be reinforced. It aims to prevent structural failure from agriculture‑related stress."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument's text confines applicability to DHC‑2 aircraft used (or previously used) in agricultural operations and prescribes inspection, repair or reinforcement before 10,000 wing hours. The document itself does not indicate any change to that scope from an earlier intent; no alteration of the population affected is evident within the provided text."},"complexity_factors":["Targeted technical inspection: requires visual and fluorescent‑penetrant methods for a specific wing area (Requirement para.1).","Decision point and approval discretion: if cracks are found the wing must be repaired to an approved repair scheme (Requirement para.1) — introduces approval/engineering oversight.","Mandatory modification option: wings not found cracked must be reinforced per DH Canada Drawing C2Z‑3111 (Requirement para.2) — requires access to specific manufacturer drawing.","Logistics and labour: inspection/modification may require removal of portions of the upper wing skin (Note) and associated reassembly work.","Information dependency: operators are directed to contact Hawker De Havilland for advice and reference drawings (Note).","Compliance timing: work must be done before each wing reaches 10,000 hours time in service (Compliance) — recurring deadline per wing.","Limited applicability: only affects DHC‑2 models that are, or have at any time been, engaged in agricultural operations (Applicability) — narrows affected population and concentrates costs.","Operator cost and operational disruption: owners/operators must fund inspections, repairs or reinforcement and schedule downtime (Applicability; Requirement; Note)."],"plain_english_summary":"This directive requires DHC‑2 (Beaver) aeroplanes that are, or have ever been, used in agricultural operations to have an internal inspection for cracks at a specific wing location and, if no cracks are found, to have the lower wing reinforced to a manufacturer drawing. Owners/operators must arrange and pay for the inspection, any approved repairs, or the reinforcement before each wing reaches 10,000 hours. Inspections use visual and fluorescent‑penetrant methods and may require removal of upper wing skin and contact with Hawker De Havilland for drawings."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-13-wing-inspection-and-modification","history":"/api/acts/ad-dhc-2-13-wing-inspection-and-modification/history","analysis":"/api/acts/ad-dhc-2-13-wing-inspection-and-modification/analysis","conflicts":"/api/acts/ad-dhc-2-13-wing-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-dhc-2-13-wing-inspection-and-modification/important-cases","documents":"/api/acts/ad-dhc-2-13-wing-inspection-and-modification/documents"}}