{"id":"F2006B09520","name":"AD/EMB-120/35 - Main Wheel Hubcap","slug":"ad-emb-120-35-main-wheel-hubcap","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54106,"registerId":"commonwealth-F2006B09520-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\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.\n\n![](image.001.png)\n\nEmbraer EMB-120 (Brasilia) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/EMB-120/35 Main Wheel Hubcap 4/2003","sectionType":"part","heading":"AD/EMB-120/35 Main Wheel Hubcap 4/2003","content":"# AD/EMB-120/35 Main Wheel Hubcap 4/2003\n\nApplicability: EMB \\- 120( ) aircraft, serial numbers 120003, 120004 and 120006 through 120359 inclusive.\n\nRequirement: 1. Carry out an inspection of the main wheel hubcap anti-skid drive coupling clips in accordance with paragraphs 2.1.1 through 2.1.5 of Embraer EMB - 120 Service Bulletin (SB) No. 120-32-0088.\n\n    2. Adjust the clip “G” gap as required to achieve the desired dimension as shown in figure 1 of Embraer EMB \\-120 SB No. 120-32-0088.\n\n    3. Where the clip cannot be adjusted as per Requirement 2, replace the clip with REV D clips in accordance with Part III of Embraer EMB \\-120 SB No. 120-32- 0088.\n    4. Replace pre-REV D clips hubs with REV D or later revision clips in accordance with Part III of Embraer EMB \\-120 SB No. 120-32-0088.\n\n    5. Amend the main wheel change procedure to include an inspection of the main wheel anti-skid drive coupling clip in accordance with Requirements 1 and 2 of this directive.\n\nNote: DAC (Brazil) AD 2003-01-01 Amendment 39-977 refers.\n\nCompliance: 1. Within 400 flight hours or 6 months from the effective date of this directive, whichever comes first.\n\n    2. Within 400 flight hours or 6 months from the effective date of this directive, whichever comes first.\n    3. Prior to returning the main wheel hubcap to service.\n\n    4. Within 800 flight hours or 12 months from the effective date of this directive, whichever comes first.\n    5. No later than 25 May 2003.\n\nThis Airworthiness Directive becomes effective on 17 April 2003.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Multiple numbered requirements (5 distinct actions) with different compliance deadlines","Cross-reference to external technical document (Embraer Service Bulletin 120-32-0088) which is not reproduced in the directive","Technical aviation terminology requiring specialized knowledge (e.g., \"anti-skid drive coupling clips\", \"REV D clips\", \"G gap\")","Conditional logic: Requirement 3 only applies \"where the clip cannot be adjusted\" per Requirement 2","Dual metric compliance periods (flight hours OR calendar time, whichever comes first)","Reference to foreign aviation directive (Brazilian DAC AD 2003-01-01) for context"],"plain_english_summary":"This CASA safety order directs operators of specified Embraer EMB‑120 Brasilia aircraft to inspect and, where needed, adjust or replace small wheel hubcap clips that connect the anti‑skid system to the wheels. \n\nIt targets affected EMB‑120s to prevent clip failure that could impair braking on landing—reducing risk of runway overruns—and requires maintenance changes to ensure ongoing compliance."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The supplied AD specifies a defined applicability and prescribes inspections, adjustments, replacements and a procedural amendment with clear compliance deadlines. The text includes a note referring to DAC (Brazil) AD 2003‑01‑01 Amendment 39‑977 but contains no indication that the scope here alters the original corrective intent or broadens/narrows applicability beyond that described in this instrument. (See 'Applicability', 'Requirement' and 'Compliance' sections.)"},"complexity_factors":["Narrow serial‑number applicability (Applicability: EMB‑120 serials 120003, 120004 and 120006–120359) increases record‑keeping and parts-tracking complexity.","Multiple distinct mandatory actions with different triggers (Requirements 1–5) require sequencing and different compliance windows.","Mixed remedies: inspect and adjust (Req 1–2), replace where adjustment impossible (Req 3), and wholesale replacement of pre‑REV D clips within longer deadline (Req 4) — creates logistical planning for parts and down‑time.","Compliance timing specified in flight hours or months (Compliance: Req 1–2 within 400 flight hours or 6 months; Req 4 within 800 flight hours or 12 months; Req 5 by 25 May 2003) demands monitoring of utilisation metrics.","Technical dependency on an external document: actions must be performed 'in accordance with' Embraer SB No. 120‑32‑0088 (Requirement text) — operators must obtain and follow the SB exactly.","Operational/procedural change required: amendment of the main wheel change procedure to include the inspection (Req 5) imposes a maintenance‑process update and training/approval steps.","Parts‑specification constraint: replacement requires REV D or later clips and references Part III of the SB (Req 3–4), creating procurement and configuration‑control considerations.","Cross‑reference to foreign authority (Note: DAC (Brazil) AD 2003‑01‑01 Amendment 39‑977) may entail alignment of records and international compliance checks."],"plain_english_summary":"This Airworthiness Directive requires operators of Embraer EMB‑120 aeroplanes (serials 120003, 120004 and 120006–120359) to inspect the main wheel hubcap anti‑skid drive coupling clips, adjust the clip “G” gap where needed, replace non‑adjustable or pre‑REV D clips with REV D (or later) clips, and amend the main wheel change procedure. All work must follow Embraer Service Bulletin 120‑32‑0088 and meet the specified flight‑hour or calendar deadlines to address an identified unsafe condition."},"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-emb-120-35-main-wheel-hubcap","history":"/api/acts/ad-emb-120-35-main-wheel-hubcap/history","analysis":"/api/acts/ad-emb-120-35-main-wheel-hubcap/analysis","conflicts":"/api/acts/ad-emb-120-35-main-wheel-hubcap/conflicts","importantCases":"/api/acts/ad-emb-120-35-main-wheel-hubcap/important-cases","documents":"/api/acts/ad-emb-120-35-main-wheel-hubcap/documents"}}