{"id":"F2006B09465","name":"AD/EMB-110/24 Amdt 1 - Control Wheel Spindle","slug":"ad-emb-110-24-amdt-1-control-wheel-spindle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53933,"registerId":"commonwealth-F2006B09465-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/24 Amdt 1 - Control Wheel Spindle","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)  Embraer EMB-110 (Bandeirante) Series Aeroplanes\n\n \n\n# AD/EMB-110/24\n\nAmdt 1\n\nApplicability: All model EMB-110.\n\n# Control Wheel Spindle 1/92\n\n \n\nRequirement: 1. Inspect Control Spindle as follows:\n\n \n\nRemove control colume cover.\n\n \n\nMeasure diameter of forward thread of the spindle. If diameter is 3/4\" no further action is necessary.\n\nIf diameter is 3/8\" proceed with inspection:-\n\n \n\nRemove spindle assembly and check vertical and conical wall thickness close to the aft ball bearing:\n\n \n\n1. Measure the depth of the large hole - this dimension should be 42mm approx.\n\n\n \n\nb.   Measure from the aft end to the aft bearing shoulder - this dimension should be 44 mm approx.\n\n \n\nc.    Calculate difference in dimension under (a) and (b).\n\n \n\nd.    Through the hole in the conical surface measure the wall thickness.\n\n \n\ne.    Crack detect all parts at the junction of the aft spindle in the region of the hole in the conical surface using the fluorescent magnetic particle method.\n\n \n\nCondition 1.\n\n \n\nIf dimension calculated at (c) is equal or greater than 2.6 mm and the dimension at (d) is equal or greater than 2 mm and there is no crack indication, the spindle may be reinstalled and the aircraft returned to service.\n\n \n\nCondition 2.\n\n \n\nIf dimensions determined (c) and (d) are below 2.6 mm and/or 2 mm respectively and there is no crack indication:-\n\n \n\nInstall a new spindle P/N 110-500-10-01-10-04. If not available it is permitted to reinstall P/N 4A-500-10-01-10-03 and repeat inspection by fluorescent magnetic particle method at intervals not exceeding 250 hours time in service until P/N 110-500-10-01-10-04 is available.\n\n \n\nCondition 3.\n\n \n\nIf a crack is detected the spindle is unserviceable and must be discarded.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\nInstall new spinddle P/N 110-500-10-01-10-04 if available or install a new spindle P/N 4A-500-10-01-10-03 and apply condition 1 or 2 as determined by inspection.\n\n \n\n2. Replace spindles affected by repeat inspections as specified in Condition 2 of Requirement 1, with a spindle P/N 4A-500-10-01-10-03 provided it complies with Condition 1 of Requirement 1, or; replace with spindles P/N 111A-500-10-01-10- 01 or P/N 110-500-10-01-10-04.\n\n \n\nNote 1: The terms aft end and forward end used in requirement 1 text have the following meaning:\n\n \n\nAft End - The end of the spindle with the greater diameter.\n\n \n\nForward End - The end of the spindle with the smaller threaded diameter.\n\n \n\nNote 2: Embraer Alert SB 110-27-0070 and Brazil CTA AD 83-02-01 R3 refers.\n\n \n\nCompliance: 1. Unless already accomplished; within 10 hours time in service after 12 January 1992, inspect in accordance with Requirement 1, until Requirement 2 is accomplished.\n\n \n\n2. Prior to 29 February 1992.\n\n \n\nThe compliance of the previous issue of this Directive was: within 10 hours time in service after 15 February 1983 and thereafter as per requirement.\n\n \n\nBackground: The manufacturer has been notified of a structural failure of the control wheel spindle, which resulted in the detachment of the control wheel in flight. Amendment 1 is issued to align this Directive with a revision of the relevant country of origin AD which requires terminating action in lieu of inspections.\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":5,"scope_assessment":{"changed":true,"description":"The amendment shifts from recurring inspection-based management to a terminating-action requirement: operators must inspect immediately (within 10 hours) and fit the specified replacement spindle by the compliance date. The background explicitly states the change aligns this Directive with the country-of-origin AD that requires a terminating replacement instead of ongoing inspections; the previous issue allowed continued inspections (per the earlier compliance note)."},"complexity_factors":["Technical measurement steps: forward thread diameter check and multiple depth/length measurements with numeric thresholds (e.g. 42 mm approx, 44 mm approx, difference ≥ 2.6 mm, wall thickness ≥ 2 mm).","Conditional branching: three Conditions (serviceable, interim with repeat inspections, unserviceable if cracked) determine different outcomes and parts to install.","Multiple part numbers and interim allowance: mandated part P/N 110-500-10-01-10-04, temporary use of P/N 4A-500-10-01-10-03 with 250‑hour reinspection intervals, and alternative P/N 111A-500-10-01-10-01.","Specific NDT method required: fluorescent magnetic particle crack detection mandated at a particular junction.","Tight compliance timing: initial inspection within 10 hours TIS and final replacement required by a set date (prior to 29 Feb 1992), creating short operational windows.","Ambiguous language: several dimensions described as \"approx\" which may require engineering judgement during inspection.","Cross-references: refers to Embraer Alert SB 110-27-0070 and Brazil CTA AD 83-02-01 R3, requiring access to external documents for full context.","Operational impact: inspections, part sourcing and potential repeated downtime or increased maintenance hours for operators and maintenance organisations."],"plain_english_summary":"This airworthiness directive requires inspection and, by a fixed deadline, replacement of the control‑wheel spindle on all Embraer EMB‑110 aeroplanes. It prescribes specific diameter and wall‑thickness measurements, fluorescent magnetic‑particle crack detection and allows temporary use of an older part number with repeat inspections until the specified replacement part is fitted.\n\nIt affects EMB‑110 operators and maintenance organisations, who must inspect within 10 flight hours and install the terminating replacement before the compliance date after a reported in‑flight detachment of a control wheel."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original 1983 directive required recurring inspections at intervals. Amendment 1 (1992) significantly expanded the scope by mandating 'terminating action' — permanent replacement of defective spindles rather than allowing indefinite repeated inspections. This shifted from an ongoing monitoring regime to a mandatory retrofit program with hard deadlines."},"complexity_factors":["Multiple conditional pathways (Conditions 1, 2, and 3) with interdependent measurement thresholds","Technical measurement requirements requiring specialised tools (micrometers, fluorescent magnetic particle inspection equipment)","Part number substitution rules with conditional availability clauses ('if available' provisions)","Mixed measurement systems (imperial: 3/4\", 3/8\"; metric: 42mm, 44mm, 2.6mm, 2mm)","Cross-references to external documents (Embraer Alert SB 110-27-0070 and Brazil CTA AD 83-02-01 R3)","Temporal compliance layering (original 1983 deadline, amended 1992 deadlines, 250-hour recurring inspection intervals)","Technical terminology requiring definitions (Note 1 clarifies 'aft' vs 'forward' ends)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Embraer EMB-110 aircraft to inspect and, if necessary, replace the control wheel spindle after reports of an in-flight detachment. It mandates wall-thickness and crack-detection testing and removal of any cracked or worn spindles to prevent loss of control.\n\nCompliance deadlines require prompt action and final replacement timelines to establish a permanent fix."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-24-amdt-1-control-wheel-spindle","history":"/api/acts/ad-emb-110-24-amdt-1-control-wheel-spindle/history","analysis":"/api/acts/ad-emb-110-24-amdt-1-control-wheel-spindle/analysis","conflicts":"/api/acts/ad-emb-110-24-amdt-1-control-wheel-spindle/conflicts","importantCases":"/api/acts/ad-emb-110-24-amdt-1-control-wheel-spindle/important-cases","documents":"/api/acts/ad-emb-110-24-amdt-1-control-wheel-spindle/documents"}}