{"id":"F2006B10455","name":"AD/HS 125/172 - Rosemount Pitot Probes","slug":"ad-hs-125-172-rosemount-pitot-probes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116173,"registerId":"commonwealth-F2006B10455-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nBritish Aerospace BAe 125 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/HS 125/172 Rosemount Pitot Probes 8/2","sectionType":"part","heading":"AD/HS 125/172 Rosemount Pitot Probes 8/2004","content":"# AD/HS 125/172 Rosemount Pitot Probes 8/2004\n\nApplicability: Model Hawker 800XP aeroplanes having serial number 258266 and serial numbers 258277 through 258500 inclusive.\n\nRequirement: 1. Replace the existing Rosemount Aerospace 853JF pitot probes with new Rosemount Aerospace 853JF1 pitot probes (includes installing a new ammeter, two new shunts, and improved electrical writing), in accordance with paragraph\n\n3.A. of the Accomplishment Instructions of Raytheon Service Bulletin SB 34- 3412, dated March 2001.\n\n2. Rosemount Aerospace 853JF pitot probe or an ammeter having P/N 2132-01- 0017, shall not be installed on any aeroplane as a replacement part.\n\nNote: FAA AD 2004-09-26 Amdt 39-13616 refers.\n\nCompliance: For Requirement 1 \\- At the next scheduled 24-month inspection, but no later than 6 months after the effective date of this Directive.\n\nFor Requirement 2 \\- As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 5 August 2004.\n\nBackground: This Directive requires replacement of certain existing pitot probes with new probes.\n\nThis action is necessary to prevent loss or fluctuation of indicated airspeed, which could result in hazardously misleading information being provided to the flight crew.\n\n![](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 23 June 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 July 2004.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It targets a specific safety defect in specific aircraft serial numbers and does not expand beyond the original purpose of correcting unsafe pitot probe conditions."},"complexity_factors":["Single, specific aircraft model and narrow serial number range (258266 and 258277-258500)","Only two requirements: replacement of parts and prohibition on future installation","Straightforward compliance timeline with clear deadline","Minimal cross-referencing (only one FAA AD mentioned in a note, not incorporated by complex reference)","No nested definitions or interpretation sections","Short document (approximately 300 words)","Single unsafe condition addressed with single corrective action"],"plain_english_summary":"This is a safety order (called an Airworthiness Directive or AD) issued by Australia's aviation safety regulator (CASA) that applies to specific Hawker 800XP business jets. It requires owners/operators to replace certain faulty pitot probes (sensors that measure airspeed) with improved versions. The old probes can cause dangerous airspeed readings to flicker or disappear, which could mislead pilots during flight. The replacement must happen at the next routine 24-month inspection, but no later than 6 months after the directive takes effect. Additionally, the old probe model and a specific ammeter part number are banned from being installed on any aircraft from the effective date onward. The directive takes effect on 5 August 2004."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD confines action to a defined set of Hawker 800XP serial numbers and mandates replacement consistent with the referenced Raytheon Service Bulletin and FAA AD. It does not expand applicability to other models or systems, nor add ongoing surveillance requirements; therefore the scope does not change from the directive's stated safety-correction intent."},"complexity_factors":["Narrow applicability: limited to specific Hawker 800XP serial numbers (reduces scope complexity).","Single, discrete technical action: replace a specified pitot probe model with a numbered successor and associated components.","Compliance timing linked to scheduled 24‑month inspection or within six months (creates a clear but binding window).","Prohibition on installing specified parts from the effective date (ongoing maintenance constraint).","Cross-references to Raytheon Service Bulletin and FAA AD add dependence on external technical instructions for execution and records.","Safety-critical subject (airspeed indicators) raises enforcement and audit attention despite procedural simplicity.","Practical complexity from parts procurement, scheduling maintenance slots, and updating maintenance records."],"plain_english_summary":"This AD requires operators of certain Hawker 800XP aircraft (s/n 258266 and 258277–258500) to replace Rosemount 853JF pitot probes with Rosemount 853JF1 units (including associated ammeter, shunts and wiring) at the next 24‑month inspection or within six months, and prohibits fitting the older probe or ammeter P/N 2132-01-0017 from the effective date. CASA states the measure prevents loss or fluctuation of indicated airspeed; the cost and downtime for parts and maintenance fall to aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-172-rosemount-pitot-probes","history":"/api/acts/ad-hs-125-172-rosemount-pitot-probes/history","analysis":"/api/acts/ad-hs-125-172-rosemount-pitot-probes/analysis","conflicts":"/api/acts/ad-hs-125-172-rosemount-pitot-probes/conflicts","importantCases":"/api/acts/ad-hs-125-172-rosemount-pitot-probes/important-cases","documents":"/api/acts/ad-hs-125-172-rosemount-pitot-probes/documents"}}