{"id":"F2006B08944","name":"AD/DH114/33 - Pneumatic System - Main Air Reservoirs","slug":"ad-dh114-33-pneumatic-system-main-air-reservoirs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52564,"registerId":"commonwealth-F2006B08944-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/33 - Pneumatic System - Main Air Reservoirs","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)  DH114 (Heron) Series Aeroplanes\n\n \n\nAD/DH114/33 Pneumatic System - Main Air Reservoirs NK\n\nApplicability: All models.\n\n \n\nDocument: Hawker Siddeley TNS Heron (114) No. S.7, Issue 1. Compliance: Before 31 December 1971.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Based solely on the directive text provided, the scope appears consistent with its stated intent: mandate compliance with a specific manufacturer document for the DH114 main air reservoirs across all models, to be completed before a set date. The AD does not indicate any change of scope from that stated purpose."},"complexity_factors":["Short, single requirement with a clear compliance deadline","Explicit applicability to all models (low scope ambiguity)","No procedural detail in the AD itself—relies on an external manufacturer document (adds an interpretive dependency)","Undeclared code \"NK\" introduces a small interpretive unknown","Historical fixed deadline reduces ongoing regulatory complexity but may create practical scheduling pressure for operators"],"plain_english_summary":"This AD requires all DH114 (Heron) operators to obtain and comply with Hawker Siddeley TNS Heron (114) No. S.7, Issue 1 concerning the pneumatic system main air reservoirs, and to complete the work before 31 December 1971. It affects aircraft owners, operators and maintenance organisations, who bear the cost and scheduling burden; the AD mandates compliance but defers technical detail to the manufacturer document."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on main air reservoirs for one aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 substantive requirements: applicability statement and compliance deadline","Single cross-reference to external technical document (Hawker Siddeley TNS Heron No. S.7)","No defined terms, no conditional logic, no exceptions","Straightforward command structure: 'do X by Y date'"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft: the **DH114 Heron series** (a British-made twin-engine passenger plane from the 1950s).\n\n**What it requires:**\n- Aircraft operators must inspect or modify the **main air reservoirs** (the tanks that store compressed air for the plane's pneumatic systems, such as brakes and landing gear) according to a specific technical document: *Hawker Siddeley TNS Heron (114) No. S.7, Issue 1*.\n\n**Who it affects:**\n- Anyone operating a DH114 Heron aircraft in Australia.\n\n**Deadline:**\n- Compliance was required **before 31 December 1971**.\n\n**Why it matters:**\n- Air reservoirs are critical safety components. Failures can lead to loss of braking or other essential systems. This directive ensures older aircraft meet updated safety standards for these components.\n\n**Note:** This directive is now **historical** — the compliance deadline passed over 50 years ago. It remains in the regulations as a record of required safety actions for this aircraft type."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-33-pneumatic-system-main-air-reservoirs","history":"/api/acts/ad-dh114-33-pneumatic-system-main-air-reservoirs/history","analysis":"/api/acts/ad-dh114-33-pneumatic-system-main-air-reservoirs/analysis","conflicts":"/api/acts/ad-dh114-33-pneumatic-system-main-air-reservoirs/conflicts","importantCases":"/api/acts/ad-dh114-33-pneumatic-system-main-air-reservoirs/important-cases","documents":"/api/acts/ad-dh114-33-pneumatic-system-main-air-reservoirs/documents"}}