{"id":"F2006B10784","name":"AD/IAI-W/1 - Maximum Operating Speed - Limitation","slug":"ad-iai-w-1-maximum-operating-speed-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56247,"registerId":"commonwealth-F2006B10784-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-W/1 - Maximum Operating Speed - Limitation","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/1 Maximum Operating Speed \\- Limitation 1/80\n\nApplicability: All models 1123 and 1124 with S/Nos. 94 to 269.\n\nRequirement: Install in clear view of the pilot a placard as follows, as applicable to model type:\n\n    For model 1123:\n\nMAXIMUM OPERATING SPEED LIMIT (VMO/MMO) WITH OR WITHOUT FUEL IN TIP TANKS:\n\nWITH AUTOPILOT ENGAGED AND WITHOUT FUEL IN TIP TANKS:\n\n    2. For model 1124:\n\nMAXIMUM OPERATING SPEED LIMIT (VMO/MMO) WITH AUTOPILOT DISENGAGED:\n\n  \nBELOW 22500 FT 314 KTS\n\nIAS ABOVE 22500 FT 0.710 M.\n\nBELOW 26000 FT 314 KTS\n\nIAS ABOVE 26000 FT 0.765 M.\n\nBELOW 22500 FT 314 KTS\n\nIAS ABOVE 22500 FT 0.710 M.\n\nWITH AUTOPILOT ENGAGED: BELOW 26000 FT 314 KTS\n\nIAS ABOVE 26000 FT 0.765 M.\n\nCompliance: Within 10 hours time in service after 5 December 1979, placard to remain in place until aeroplane is modified in accordance with SB No. WW23 or SB No. WW24-17 as applicable and Israel CAA AD No. 1007.\n\nBackground: A discrepancy in the pattern of rivets installed in the wing root assembly and in the total strength assumption has been noted by the manufacturer.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific structural defect in a limited fleet of aircraft. The scope remains tightly focused on the original safety issue — the rivet pattern and strength assumption discrepancy in the wing root — and the prescribed remedy (speed limitation via placard). There is no evidence of scope creep; the directive does not expand into unrelated operational areas or aircraft systems."},"complexity_factors":["Multiple conditional variables: model type (1123 vs 1124), autopilot status, fuel tank status, and altitude thresholds create a matrix of different speed limits","Mixed units of measurement: requires understanding of both KTS (knots/indicated airspeed) and Mach number, with different crossover altitudes for different configurations","Cross-references to external documents: compliance requires reference to manufacturer service bulletins (SB WW23, SB WW24-17) and a foreign aviation authority directive (Israel CAA AD No. 1007)","Temporal compliance requirement: specific deadline tied to flight hours after a fixed date","Technical aviation terminology: assumes knowledge of VMO/MMO (maximum operating speed limits), time in service, and airworthiness directive concepts"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Israel Aircraft Industries Westwind business jets (models 1123/1124, serials 94–269) to install a cockpit placard limiting airspeed because of discovered wing-root rivet defects and reduced wing strength. Compliance was required within 10 flight hours after 5 December 1979. The placard remains until the aircraft receive the manufacturer’s permanent structural modifications per the specified service bulletins and related Israeli AD."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive imposes a temporary operational limitation (a placard with speed limits) on a defined set of serial-numbered aircraft until specified structural modifications are carried out. It does not broaden the class of affected aircraft beyond the stated S/N range or amend certification standards; it prescribes an interim operational control pending modification per the listed service documents."},"complexity_factors":["Model- and serial-number limited applicability (all 1123/1124 with S/N 94–269) increases narrow targeting and tracking requirements","Different speed limits expressed as IAS or Mach depending on altitude (altitude-dependent limits introduce operational nuance)","Different autopilot and fuel-in-tip-tank conditions alter which limit applies (conditional rules increase pilot decision points)","Short compliance window (10 hours time in service) imposes quick operational changes on operators","Requirement is temporary and tied to later modifications via two Service Bulletins and an Israel CAA AD, creating procedural linkage to other documents"],"plain_english_summary":"Requires operators of Israel Aircraft Industries Westwind models 1123 and 1124 (S/N 94–269) to install a cockpit placard showing maximum operating speeds (IAS or Mach) under specified altitude, autopilot and tip‑tank fuel conditions. Compliance is due within 10 hours’ time in service; the placard must stay in place until the aeroplane is modified via the listed Service Bulletins and Israel CAA AD. The manufacturer reported a rivet/strength discrepancy; operators bear the installation cost and must observe the speed limits until modification is complete."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-1-maximum-operating-speed-limitation","history":"/api/acts/ad-iai-w-1-maximum-operating-speed-limitation/history","analysis":"/api/acts/ad-iai-w-1-maximum-operating-speed-limitation/analysis","conflicts":"/api/acts/ad-iai-w-1-maximum-operating-speed-limitation/conflicts","importantCases":"/api/acts/ad-iai-w-1-maximum-operating-speed-limitation/important-cases","documents":"/api/acts/ad-iai-w-1-maximum-operating-speed-limitation/documents"}}