{"id":"F2006B10798","name":"AD/IAI-W/22 - Horizontal Stabilizer Trim Actuator","slug":"ad-iai-w-22-horizontal-stabilizer-trim-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56263,"registerId":"commonwealth-F2006B10798-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/22 Horizontal Stabilizer Trim A","sectionType":"part","heading":"AD/IAI-W/22 Horizontal Stabilizer Trim Actuator 12/2000","content":"# AD/IAI-W/22 Horizontal Stabilizer Trim Actuator 12/2000\n\nDM\n\nApplicability: All IAI 1121/1121A/1121B, 1123 and 1124/1124A series aircraft.\n\nRequirement: Inspect the horizontal stabilizer trim actuator for correct installation of the tierod through the dust shield and both jackscrew assemblies in accordance with Israel Aircraft Industries Alert Service Bulletins 1121-27A-028, 1123-27A-053 and 1124- 27A-147, as applicable.\n\nNote: CAAI AD 27-00-09-01 refers.\n\nCompliance: Within 25 flying hours after the effective date of this Airworthiness Directive.\n\nThis Airworthiness Directive becomes effective on 25 October 2000.\n\nBackground: This Directive is prompted by advice from the CAAI that an incorrectly installed dust shield can jam the horizontal stabilizer trim actuator leading to loss of pitch control.\n\n![Signature of Eugene Paul Holzapfel](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 19 October 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 25 October 2000.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical installation defect in specific IAI aircraft models. There is no evidence of scope creep; it targets exactly the unsafe condition described in the background (incorrect dust shield installation) without expanding to unrelated systems or aircraft types."},"complexity_factors":["Single, specific mechanical component targeted (horizontal stabilizer trim actuator)","Only one requirement: visual/physical inspection for correct installation","Three alternative compliance documents referenced (manufacturer service bulletins), but applicant selects based on aircraft model","Simple compliance deadline: 25 flying hours after effective date","No nested exceptions, conditional logic, or defined terms section","Total length: approximately 250 words","Clear applicability section listing specific aircraft models by series"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of IAI 1121/1123/1124 series aircraft to inspect the horizontal stabilizer trim actuator to confirm the dust shield and tie‑rod are correctly installed, per the manufacturer’s service bulletins. The mandatory inspection must be done within 25 flying hours because an incorrect installation can jam the actuator and cause loss of pitch control."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains focused on the listed IAI models and a one-off inspection requirement to verify correct installation of the tierod through the dust shield and jackscrews within 25 flying hours. The AD mirrors and depends on Israel Aircraft Industries Alert Service Bulletins and references a corresponding CAAI AD; it does not broaden applicability, introduce ongoing monitoring, or mandate design modification."},"complexity_factors":["Narrow aircraft applicability: limited to specific IAI 1121/1121A/1121B, 1123 and 1124/1124A series (Applicability).","Short compliance window: inspection required within 25 flying hours, creating scheduling pressure for operators (Compliance).","Prescriptive reliance on manufacturer Alert Service Bulletins for the inspection procedure rather than embedding step-by-step actions in the AD (Requirement).","Single, discrete inspection task with low technical complexity but significant safety consequence if missed (Requirement / Background).","Regulatory authority delegated to CASA as issuing body; enforcement and record-keeping remain with operators (signature/delegate reference)."],"plain_english_summary":"This Airworthiness Directive requires operators of IAI 1121/1121A/1121B, 1123 and 1124/1124A aircraft to inspect the horizontal stabilizer trim actuator and confirm the tierod is correctly routed through the dust shield and both jackscrew assemblies, using the referenced Israel Aircraft Industries Alert Service Bulletins. The inspection must be completed within 25 flying hours because an incorrectly installed dust shield can jam the actuator and lead to loss of pitch control."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-22-horizontal-stabilizer-trim-actuator","history":"/api/acts/ad-iai-w-22-horizontal-stabilizer-trim-actuator/history","analysis":"/api/acts/ad-iai-w-22-horizontal-stabilizer-trim-actuator/analysis","conflicts":"/api/acts/ad-iai-w-22-horizontal-stabilizer-trim-actuator/conflicts","importantCases":"/api/acts/ad-iai-w-22-horizontal-stabilizer-trim-actuator/important-cases","documents":"/api/acts/ad-iai-w-22-horizontal-stabilizer-trim-actuator/documents"}}