{"id":"F2006B09517","name":"AD/EMB-120/30 - Aileron and Elevator Rotary Variable Inductive Transducer Bellcrank Inspection","slug":"ad-emb-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54096,"registerId":"commonwealth-F2006B09517-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-120/30 - Aileron and Elevator Rotary Variable Inductive Transducer Bellcrank Inspection","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)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.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.\n\nEmbraer EMB-120 Series Aeroplanes\n\nAD/EMB-120/30 Aileron and Elevator Rotary Variable Inductive\n\nTransducer Bellcrank Inspection\n\n  \n10/2001\n\nTX\n\nApplicability: All EMB-120( ) models, serial numbers 120004, and 120006 through 120355 inclusive, modified in accordance with any revision of Embraer Service Bulletins (SB) 120-31-0039, 120-31-0040, 120-31-0041 or 120-31-0042.\n\nRequirement: Perform a one-time inspection, in accordance with the procedures in Embraer Alert SB 120-31-A046, of the aileron and elevator rotary variable inductive transducer (RVIT) bellcrank to ensure they are properly assembled and that the bolt that attaches the bellcrank is properly torqued.\n\nNote: DAC (Brazil) Emergency AD 2001-07-01 refers.\n\nCompliance: Within 50 hours time in service from the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 7 August 2001.\n\nBackground: The Brazilian Departamento de Aviação Civil (DAC) has received reports of aileron control range being limited due to interference between the aileron RVIT bellcrank and the head of the pin that attaches the RVIT support. The DAC has determined that similar interference may also occur with the elevator RVIT bellcrank limiting the range of elevator control.\n\nThis Directive requires a one-time inspection of both RVIT bellcrank assemblies to ensure the there is no interference which may limit either aileron or elevator travel.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 2 August 2001\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 7 August 2001.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive aligns with the original safety concern in the background: it targets RVIT bellcrank interference that may limit aileron or elevator travel and mandates a one-time inspection on the specified modified serials. It does not broaden the affected fleet beyond the listed serial numbers and SB modifications, nor does it convert the requirement into a recurring inspection."},"complexity_factors":["Narrow applicability by specific serial numbers and modification status (Applicability)","Requires follow-up to an external supplier document: Embraer Alert SB 120-31-A046 (Requirement)","Short compliance window of 50 hours time-in-service (Compliance)","Technical nature of work: assembly check and bolt torque verification (Requirement/Background)","One-time mandatory action rather than recurring inspections (Requirement)","Regulatory basis under CAR 1998 subreg 39.1(1) (Header)","Cross-reference to Brazilian DAC Emergency AD 2001-07-01 (Background)","Potential ambiguity about which SB revisions qualify as the listed modification (Applicability)"],"plain_english_summary":"This Airworthiness Directive requires a one-time inspection of the aileron and elevator rotary variable inductive transducer (RVIT) bellcranks on specified Embraer EMB-120 aircraft (serials 120004 and 120006–120355) modified per the listed Embraer service bulletins, to confirm correct assembly and bolt torque and prevent interference that could limit control travel. Operators must complete the inspection within 50 hours time-in-service; the CASA delegate issued the AD under CAR 1998 subreg 39.1(1). Operators bear the compliance cost and carry out a technical inspection to restore certainty of control movement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific unsafe condition identified by the Brazilian aviation authority regarding RVIT bellcrank interference on modified EMB-120 aircraft. The directive has not expanded beyond its original purpose of mandating a one-time inspection to prevent control surface restriction."},"complexity_factors":["Single, specific mechanical inspection requirement with clear reference to external technical document (Embraer Alert SB 120-31-A046)","Narrow applicability: limited to specific aircraft model, serial number range, and prior modification history","No defined terms section — technical terms (RVIT, bellcrank, torque) are industry-standard or explained by context","Simple compliance structure: one-time action with single time-based deadline (50 hours time in service)","No nested exceptions, conditional logic, or cross-references to other legislation beyond the enabling regulation (CAR 1998 subregulation 39.1(1))","Short document (approximately 300 words) with standard AD format"],"plain_english_summary":"This CASA safety order requires operators of certain modified Embraer EMB‑120 aircraft to carry out a one‑time inspection of the aileron and elevator bellcranks (which include rotary variable inductive transducers) to confirm correct assembly and proper bolt torque. It targets specified serial numbers modified per Embraer service bulletins, must be done within 50 flight hours of 7 August 2001, and addresses a risk of control restriction from part interference."},"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-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection","history":"/api/acts/ad-emb-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection/history","analysis":"/api/acts/ad-emb-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection/analysis","conflicts":"/api/acts/ad-emb-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection/conflicts","importantCases":"/api/acts/ad-emb-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection/important-cases","documents":"/api/acts/ad-emb-120-30-aileron-and-elevator-rotary-variable-inductive-transducer-bellcrank-inspection/documents"}}