{"id":"F2006B06827","name":"AD/SD3-30/26 Amdt 1 - Pitot Static Heaters","slug":"ad-sd3-30-26-amdt-1-pitot-static-heaters","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114691,"registerId":"commonwealth-F2006B06827-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/26 Amdt 1 - Pitot Static Heaters","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)  Short SD3-30 Series Aeroplanes\n\n \n\n# AD/SD3-30/26\n\nAmdt 1\n\nApplicability: All SD3-30.\n\n# Pitot Static Heaters 12/91\n\n \n\nRequirement: Action in accordance with Shorts SB SD3-30-24-25 Revision 2.\n\n \n\nNote: UK CAA mandatory.\n\n \n\nCompliance: At next 'D' check or 4800 flight hours after 30 November 1990, whichever occurs later, but no later than 1 June 1992.\n\n \n\nBackground: To prevent the loss of pitot heat whenever a generator fails. Amendment 1 to this AD is issued to reflect revised procedures introduced by Revision 2 to SB SD3-30-24-25.\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 amendment does not expand the set of aircraft covered — it continues to apply to all SD3-30 aeroplanes (Applicability). The AD updates the required procedures by referencing Revision 2 of Shorts SB SD3-30-24-25 (Requirement; Background), so the technical implementation details change but the population of affected aircraft and the compliance window remain the governing scope."},"complexity_factors":["Reference to an external technical document (Shorts SB SD3-30-24-25 Revision 2) rather than reproducing procedures increases implementation steps.","Compliance deadline linked to maintenance schedule ('D' check) or flight-hours creates scheduling and tracking complexity for operators.","Technical subject matter (pitot/static heating and generator failure interactions) requires specialist maintenance competence.","Interplay with another regulator's mandate (UK CAA) may create multi-jurisdictional coordination needs.","Amendment updates existing procedures rather than changing applicability, so implementers must compare revisions to prior work."],"plain_english_summary":"This AD requires every Short SD3‑30 operator to carry out Shorts Service Bulletin SD3‑30‑24‑25 Revision 2 — at the next scheduled D check or within 4,800 flight hours after 30 Nov 1990, and no later than 1 June 1992. It mandates the SB to prevent pitot‑heat loss after generator failure, shifting cost, scheduling and technical responsibility to owners/operators and their maintenance organisations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive addressing a specific technical defect in a specific aircraft type. Amendment 1 simply updates the reference to a revised service bulletin (Revision 2), maintaining the original scope of ensuring pitot heat reliability. No scope creep is evident."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability (\"All SD3-30\")","Single requirement referencing an external document (Shorts SB SD3-30-24-25 Revision 2)","Simple compliance deadline structure (alternative deadlines with a hard cap)","No nested exceptions or conditional logic","No internal cross-references to other legislation sections","Straightforward background explanation without technical sub-clauses"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. Specifically, it's **AD/SD3-30/26 Amendment 1**, which applies to all **Short SD3-30 series aeroplanes** (a type of regional turboprop aircraft, also known as the Short 330).\n\n**What it does:** The directive requires aircraft operators to follow a specific manufacturer's service bulletin — **Shorts SB SD3-30-24-25 Revision 2** — to fix a problem with the **pitot-static heaters**.\n\n- **Pitot-static system:** This is the equipment that measures airspeed and altitude. The \"pitot tube\" sticks out into the airflow to measure pressure, and the \"static\" ports measure ambient air pressure. These are critical for safe flight.\n- **The problem:** If a generator fails, the pitot heat (which prevents ice from blocking the tubes) could be lost. Iced-up pitot tubes give false airspeed readings — a serious safety hazard.\n- **The fix:** The service bulletin contains revised procedures to ensure pitot heat remains available even if a generator fails.\n\n**Who it affects:** Operators and owners of Short SD3-30 aircraft.\n\n**When to comply:** By the next major 'D' check (a heavy maintenance inspection) or within 4,800 flight hours after 30 November 1990 — whichever comes later, but absolutely no later than 1 June 1992.\n\n**Why it matters:** This prevents potentially catastrophic loss of airspeed indication due to ice buildup, which has caused accidents in aviation history. The UK Civil Aviation Authority (CAA) also made this mandatory, reflecting international coordination on this safety issue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-26-amdt-1-pitot-static-heaters","history":"/api/acts/ad-sd3-30-26-amdt-1-pitot-static-heaters/history","analysis":"/api/acts/ad-sd3-30-26-amdt-1-pitot-static-heaters/analysis","conflicts":"/api/acts/ad-sd3-30-26-amdt-1-pitot-static-heaters/conflicts","importantCases":"/api/acts/ad-sd3-30-26-amdt-1-pitot-static-heaters/important-cases","documents":"/api/acts/ad-sd3-30-26-amdt-1-pitot-static-heaters/documents"}}