{"id":"F2006B10794","name":"AD/IAI-W/19 - Hydraulic Low Pressure Warning System","slug":"ad-iai-w-19-hydraulic-low-pressure-warning-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56259,"registerId":"commonwealth-F2006B10794-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-W/19 - Hydraulic Low Pressure Warning System","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nIsrael Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes\n\nAD/IAI-W/19 Hydraulic Low Pressure Warning System 13/98\n\nApplicability: Model 1124 and 1124A aeroplanes all serial numbers.\n\nRequirement: Modify the electrical wiring and install an independent circuit breaker for the hydraulic low pressure warning system, together with an associated label, on the overhead panel in accordance with Israel Aircraft Industries 1124-Westwind Alert Service Bulletin No 1124-29A-140 dated 15 August 1998.\n\nNote: Israel CAA AD 29-98-09-01 refers.\n\nCompliance: Within 400 hours time in service, but no later than 31 October 1999. This Airworthiness Directive becomes effective on 3 December 1998.\n\nBackground: The nose wheel steering and the hydraulic low pressure warning electrical circuits were connected to the same circuit breaker. A failure in the steering circuit causing the circuit breaker to trip results in a loss of warning of low hydraulic pressure, creating an unsafe condition.\n\nThis directive corrects the unsafe condition by precluding the possibility of a loss of warning of low hydraulic pressure during malfunction of the nose wheel steering electrical circuit.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive addressing one specific safety defect in one aircraft type. It has not expanded beyond its original purpose of mandating a wiring modification to prevent loss of hydraulic pressure warnings."},"complexity_factors":["Single, specific technical requirement with clear reference to manufacturer service bulletin","Only one defined applicability criterion (model numbers and serial numbers)","Simple binary compliance deadline (whichever comes first: 400 hours or fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation provided in plain narrative form","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive mandates rewiring and relabeling on Israel Aircraft Industries Westwind Model 1124/1124A jets so the hydraulic low-pressure warning has its own circuit breaker, per IAI Service Bulletin No. 1124-29A-140. It addresses a wiring fault where a steering-system trip could silence a critical hydraulic warning. It affected all serial numbers; compliance was within 400 flight hours or by 31 Oct 1999 (AD effective 3 Dec 1998)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains corrective and targeted: it applies to all 1124/1124A aircraft and mandates the wiring and circuit‑breaker modification described in the AD (Applicability; Requirement). No expansion beyond the original safety fix is introduced."},"complexity_factors":["Technical electrical work: rewiring and installation of a separate circuit breaker (Requirement).","Must follow manufacturer Alert Service Bulletin procedures (Requirement).","Universal applicability to all serial numbers of two models increases logistical scope (Applicability).","Fixed compliance window creates scheduling pressure for operators (Compliance).","Operational consequence linkage: modification isolates warning circuit from nose‑wheel‑steering faults (Background)."],"plain_english_summary":"Requires wiring changes and fitment of an independent circuit breaker and an overhead‑panel label for the hydraulic low‑pressure warning on IAI Westwind 1124/1124A aircraft. Applies to all serial numbers; owners/operators must carry out the modification per Israel Aircraft Industries Alert Service Bulletin (Requirement) and comply within 400 flight hours or by 31 October 1999 (Compliance). The measure is intended to stop a nose‑wheel‑steering electrical fault from disabling the hydraulic low‑pressure warning (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-19-hydraulic-low-pressure-warning-system","history":"/api/acts/ad-iai-w-19-hydraulic-low-pressure-warning-system/history","analysis":"/api/acts/ad-iai-w-19-hydraulic-low-pressure-warning-system/analysis","conflicts":"/api/acts/ad-iai-w-19-hydraulic-low-pressure-warning-system/conflicts","importantCases":"/api/acts/ad-iai-w-19-hydraulic-low-pressure-warning-system/important-cases","documents":"/api/acts/ad-iai-w-19-hydraulic-low-pressure-warning-system/documents"}}