{"id":"F2006B10778","name":"AD/IAI-A/3 - Airframe De-Ice Boots - Pressure Indication Switches","slug":"ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56235,"registerId":"commonwealth-F2006B10778-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-A/3 - Airframe De-Ice Boots - Pressure Indication Switches","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)  \n![](image.002.png)  Israel Aircraft Industries 1125 (Astra) Series Aeroplanes\n\n \n\n# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  For 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 CAR 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 \n\n# AD/IAI-A/3 Airframe De-Ice Boots - Pressure Indication Switches\n\n\n7/2000\n\n \n\nApplicability: Model 1125 and Astra SPX aeroplanes with Serial Numbers 004 through 115 inclusive.\n\n \n\nRequirement:  If not previously accomplished, replace all the inflation pressure indication switches of the airframe de-ice boots system with switches Part Number V25W787003-005 in accordance with Astra Alert Service Bulletin 1125-30A-199 dated 17 April 2000.\n\n \n\nNote: Israel CAA AD 30-00-02-05 refers.\n\n \n\nCompliance: Before 7 March 2001.\n\n \n\nThis Airworthiness Directive becomes effective on 13 July 2000.\n\n \n\nBackground: Existing indication on the switches of the de-icing boots system operate at 13±1 PSIG whereas, according to the de-icing boot’s manufacturer, 15 PSIG is the required pressure for effective de-icing. Therefore, indication of normal system operation may be misleading when the system is operating at reduced pressure and ice removal capability may be insufficient throughout the aeroplanes certified envelope of ice conditions.\n\n \n\nThis Directive requires the replacement of the existing switches with switches that operate at a higher pressure.\n\n![](image.003.png)  \n\n\n \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 23 May 2000\n\n \n\n \n\n \n\n \n\n \n\n \n\n![](image.002.png)  \n\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.\n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains aligned with the stated safety objective in the AD: it targets replacement of pressure indication switches on specified aircraft (Applicability; Requirement) to correct misleading indications (Background). The directive does not extend beyond the listed models/serials or require additional modifications, so the scope has not changed from the AD’s corrective intent."},"complexity_factors":["Narrow technical remedy: specific part number (V25W787003-005) required","Limited applicability by model and serial numbers (Model 1125 and Astra SPX, S/N 004–115)","Fixed compliance deadline (before 7 March 2001) and effective date (13 July 2000)","Reliance on an external manufacturer service bulletin (Astra Alert Service Bulletin 1125-30A-199)","Safety-critical system (airframe de-ice boots) raises operational risk if not complied with","Administrative enforcement under CAR subregulation 39.1(1) with no alternative compliance path stated"],"plain_english_summary":"Requires owners/operators of Israel Aircraft Industries Model 1125 and Astra SPX aeroplanes (S/N 004–115) to replace airframe de‑ice boot inflation pressure indication switches with Part No. V25W787003‑005 per Astra Alert Service Bulletin 1125‑30A‑199. Deadline: before 7 March 2001; AD effective 13 July 2000. CASA says existing switches indicate at 13±1 PSIG while 15 PSIG is required for effective de‑icing, so the replacement raises the indication threshold. Owners pay for parts and installation; compliance is mandatory under CAR subregulation 39.1(1)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted airworthiness directive addressing a specific safety defect in a limited fleet of aircraft. The scope remains precisely focused on the original safety issue: correcting misleading pressure indications in de-icing systems."},"complexity_factors":["Single, specific aircraft model range (serial numbers 004-115)","One clear mechanical action required (switch replacement)","Single compliance deadline with no conditional exceptions","Only one defined part number referenced","No nested cross-references to other legislation (only a non-binding note referencing an Israeli CAA directive)","Background explanation provided in plain language"],"plain_english_summary":"Owners/operators of Israel Aircraft Industries 1125 and Astra SPX (serials 004–115) must replace de‑icing system pressure indication switches with P/N V25W787003‑005 per the manufacturer's 17 Apr 2000 service bulletin, before 7 Mar 2001. The existing switches show “normal” at 13 PSI though boots require 15 PSI, so the replacement ensures pilots get accurate pressure readings and prevents undetected, unsafe ice accumulation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches","history":"/api/acts/ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches/history","analysis":"/api/acts/ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches/analysis","conflicts":"/api/acts/ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches/conflicts","importantCases":"/api/acts/ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches/important-cases","documents":"/api/acts/ad-iai-a-3-airframe-de-ice-boots-pressure-indication-switches/documents"}}