{"id":"F2006B09060","name":"AD/DHC-3/12 - Flap Hydraulic Jack","slug":"ad-dhc-3-12-flap-hydraulic-jack","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52809,"registerId":"commonwealth-F2006B09060-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/12 - Flap Hydraulic Jack","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)  DHC-3 (Otter) Series Aeroplanes\n\n \n\nAD/DHC-3/12 Flap Hydraulic Jack NK\n\nApplicability: All models with S/Nos 1 to 201.\n\n \n\nRequirement: Action in accordance with De H Canada EB “O” No 38.\n\n \n\nNote: Canadian AD 57-8 refers.\n\n \n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical component on a specific aircraft type. It has not expanded beyond its original purpose of ensuring flap hydraulic jack integrity."},"complexity_factors":["Extremely short document (under 150 words)","Only one substantive requirement: comply with an external technical document (De Havilland Canada EB \"O\" No. 38)","No defined terms section — relies entirely on external references","No conditional logic or nested exceptions","Single applicability criterion (serial number range)","Cross-references are minimal and informational only (Canadian AD 57-8)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of **De Havilland Canada DHC-3 (Otter) series aeroplanes** with serial numbers 1 through 201 to take immediate action on the **flap hydraulic jack** (the hydraulic system that controls the aircraft's flaps — the movable surfaces on the wings that help with takeoff and landing).\n\n**Who must comply:**\n- Anyone who owns, operates, or maintains affected DHC-3 Otter aircraft in Australia.\n\n**What action is required:**\n- Follow the instructions in **De Havilland Canada Engineering Bulletin \"O\" No. 38** (a technical notice from the aircraft manufacturer).\n- This is linked to **Canadian Airworthiness Directive 57-8**, suggesting this addresses a known safety issue identified by Canadian aviation authorities.\n\n**When:**\n- **\"Forthwith\"** means immediately — no grace period.\n\n**Why it matters:**\nHydraulic flap failures can prevent pilots from properly configuring the aircraft for landing, potentially leading to loss of control or runway accidents. This directive ensures a known defect is fixed before it causes an incident."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument specifies a clear, limited scope: DHC‑3 aeroplanes with serial numbers 1–201 must comply immediately with the actions set out in De Havilland Canada EB \"O\" No 38 (Applicability; Requirement; Compliance). The text itself does not indicate any expansion or narrowing of scope from an earlier version; no change of scope is stated within this instrument."},"complexity_factors":["Short instrument text that delegates substantive technical requirements to an external engineering bulletin (De H Canada EB \"O\" No 38).","Immediate compliance timing (\"Forthwith\") increases operational and logistical complexity for owners/operators.","Applicability specified by serial number range (S/Nos 1–201) requires fleet‑level identification and tracking.","Cross‑reference to a foreign airworthiness directive (Canadian AD 57‑8) adds an additional layer of external material to consult.","Lack of detail in the AD about allowable alternative compliance methods or approval pathways increases regulatory uncertainty."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of De Havilland DHC‑3 (Otter) aircraft with serial numbers 1–201 to carry out, forthwith, the work specified in De Havilland Canada Engineering Bulletin \"O\" No 38 (the AD cites Canadian AD 57‑8). The cost, scheduling and downtime consequences fall on the affected owners/operators; the AD itself defers technical detail to the referenced EB."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-12-flap-hydraulic-jack","history":"/api/acts/ad-dhc-3-12-flap-hydraulic-jack/history","analysis":"/api/acts/ad-dhc-3-12-flap-hydraulic-jack/analysis","conflicts":"/api/acts/ad-dhc-3-12-flap-hydraulic-jack/conflicts","importantCases":"/api/acts/ad-dhc-3-12-flap-hydraulic-jack/important-cases","documents":"/api/acts/ad-dhc-3-12-flap-hydraulic-jack/documents"}}