{"id":"F2006B10799","name":"AD/IAI-W/23 - Brake System Hydraulic Fuse","slug":"ad-iai-w-23-brake-system-hydraulic-fuse","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56264,"registerId":"commonwealth-F2006B10799-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \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 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.","sortOrder":0},{"sectionNumber":"AD/IAI-W/23 Brake System Hydraulic Fuse ","sectionType":"part","heading":"AD/IAI-W/23 Brake System Hydraulic Fuse 7/2001","content":"# AD/IAI-W/23 Brake System Hydraulic Fuse 7/2001\n\nApplicability: Israel Aircraft Industries Ltd. (IAI) 1121, 1121A, 1121B, 1123, 1124 and 1124A series aircraft.\n\nRequirement: 1. Perform a functional test (by measuring fluid loss) for proper operation of hydraulic fuses installed in brake system and emergency hydraulic indicating system in accordance with one of the following, as applicable to the aircraft:\n\n    (a) Commodore Jet Service Bulletin (SB) 1121-29-022 for Model 1121, 1121A and 1121B series aeroplanes.\n\n    (b) Westwind SB 1123-29-045 for Model 1123 series aeroplanes.\n\n    (c) Westwind SB 1124-29-132 for Model 1124 and 1124A series aeroplanes.\n\nIf during the inspection required by paragraph 1(a) to 1(c), any discrepancy is found, replace the fuse with a new, improved fuse part number 713047 with suffix “A” after the serial number, prior to further flight.\n\n2. Do not install a hydraulic fuse having part number 713047, unless it has a suffix “A” after the serial number.\n\nNote 1: CAA Israel AD 29-97-03-10 and FAA AD 98-06-10 refer.\n\nNote 2: Replacement of fuse with part number 713047 with suffix “A” after the serial number does not constitute a terminating action for the repeat inspections.\n\nCompliance: 1. Unless previously accomplished, carry out initial inspection within 250 flight hours or 1 year after the effective date of this Airworthiness Directive, whichever occurs first. Thereafter repeat the inspection at intervals not to exceed 1200 flight hours or 3 years, whichever occurs first.\n\n2. From the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 12 July 2001.","sortOrder":1}],"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":3,"scope_assessment":{"changed":false,"description":"The directive applies to the specific IAI 1121/1123/1124 series listed in the Applicability and directs testing, replacement and installation limits for a specific fuse P/N. The text does not expand or narrow that applicability beyond the stated aircraft models or introduce additional categories of products or operations (Applicability; Requirement; Compliance)."},"complexity_factors":["Technical operational test required: functional fluid-loss test of hydraulic fuses (Requirement 1(a)–1(c)).","Model-specific procedures: three different service bulletins referenced depending on aircraft model (Requirement 1(a)–1(c)).","Part-number detail and installation restriction: replacement part must be P/N 713047 with suffix “A”; installation of 713047 without suffix “A” is prohibited (Requirement 1, Requirement 2).","Recurring compliance burden: initial inspection within 250 flight hours or 1 year, then repeat every 1200 flight hours or 3 years (Compliance).","Non-terminating replacement: Note 2 states installing the improved fuse does not terminate the repeat inspections, creating ongoing inspection costs.","Cross-jurisdictional references: CAA Israel AD and FAA AD cited (Note 1), requiring coordination with foreign service instructions and records.","Immediate operational constraint: any discrepant fuse must be replaced prior to further flight, creating potential AOG/parts-procurement impacts (Requirement 1).","Regulatory provenance and discretion: AD issued under CAR 1998 subregulation 39.1(1) by CASA delegate (introductory text), indicating administrative authority to mandate corrective action."],"plain_english_summary":"This Airworthiness Directive requires operators of Israel Aircraft Industries models 1121, 1121A, 1121B, 1123, 1124 and 1124A to perform a fluid-loss functional test of brake-system hydraulic fuses using the model-specific service bulletin. If a fuse fails the test, it must be replaced with part number 713047 bearing an “A” suffix before further flight, and fuses without the “A” suffix must not be installed.\n\nThe AD sets an initial inspection window (250 flight hours or 1 year) and recurring intervals (every 1200 flight hours or 3 years) and states that replacement with the “A”-suffix fuse does not stop the repeat inspections."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with focused scope — it addresses a specific unsafe condition in specific aircraft models through targeted inspection and replacement requirements. The scope remains tightly constrained to brake system hydraulic fuses on the identified IAI aircraft series."},"complexity_factors":["Multiple applicability categories requiring different service bulletins (3 separate manufacturer documents referenced)","Conditional logic: 'if discrepancy found, replace before further flight'","Dual compliance timelines (initial vs. recurring inspections with different intervals)","Part number suffix distinction creates a technical compliance trap (713047 vs 713047A)","Cross-references to foreign aviation authorities (CAA Israel and FAA ADs)"],"plain_english_summary":"This CASA safety order requires owners/operators of IAI Westwind and Commodore Jet models listed to test brake-system hydraulic fuses for fluid loss per manufacturer service bulletins, replace any failing fuses with the improved part (PN ending in \"A\"), and prohibits fitting the old design from the effective date.  \n\nHydraulic fuses prevent catastrophic hydraulic loss from a broken brake line; the action addresses an unsafe condition. Initial test is due within 250 flight hours or 1 year, then every 1,200 hours or 3 years."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-23-brake-system-hydraulic-fuse","history":"/api/acts/ad-iai-w-23-brake-system-hydraulic-fuse/history","analysis":"/api/acts/ad-iai-w-23-brake-system-hydraulic-fuse/analysis","conflicts":"/api/acts/ad-iai-w-23-brake-system-hydraulic-fuse/conflicts","importantCases":"/api/acts/ad-iai-w-23-brake-system-hydraulic-fuse/important-cases","documents":"/api/acts/ad-iai-w-23-brake-system-hydraulic-fuse/documents"}}