{"id":"F2006B09859","name":"AD/F50/32 Amdt 1 - Electrical Power - Terminal Block and Contactor Torque Values","slug":"ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54944,"registerId":"commonwealth-F2006B09859-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F50/32 Amdt 1 - Electrical Power - Terminal Block and Contactor Torque Values","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)  \nFokker F50 (F27 Mk 50) Series Aeroplanes\n\nAD/F50/32\n\nAmdt 1\n\n  \n\nElectrical Power \\- Terminal Block and Contactor Torque Values\n\n  \n7/90\n\nApplicability: All F27 Mk50 aircraft serial numbers 20103 to 20108; 20110 to 20169, 20171 and\n\n20172.\n\nRequirement: Action in accordance with Fokker Service Bulletin F50-24-A013 Revision 2 or later.\n\nNote: RLD Airworthiness Directive BLA 89-159 Issue 2 also refers.\n\nCompliance: Prior to 21 January 1990.\n\nBackground: Recently, an incident occurred on a Fokker 100, involving smoke on the flight deck during approach. The most probable cause is thought to be an improperly tightened terminal on a generator line contactor (GLC) in the electrical power centre (EPC). The contactor’s resistance generated enough heat to make the terminal red hot, which resulted in the partial melting of the EPC. As the installation on Fokker 50 aircraft is similar, and improperly tightened connections have also been found on these aircraft, this Airworthiness Directive calls for the inspection and adjustment of the torque values on the terminal blocks and contactors in the EPC and on the relay panel in the forward cargo compartment.\n\nAmendment 1 to this AD is issued to reflect a change in effectivity, compliance, and the Requirement document revision status. No additional work is generated by this amendment.","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 makes administrative updates only (aircraft serial numbers affected, compliance date, and document revision status). The core safety purpose — inspecting and tightening electrical terminals to prevent overheating — remains unchanged from the original directive."},"complexity_factors":["Very short document (under 300 words)","Only 3 operative provisions: applicability, requirement, and compliance","Single cross-reference to a Fokker Service Bulletin and a Dutch RLD directive","No defined terms section — all language is technical but plain","No conditional logic or nested exceptions","Amendment 1 explicitly states 'no additional work is generated' — simplifying interpretation"],"plain_english_summary":"CASA requires operators of specified Fokker F50 aircraft to inspect and tighten electrical terminals in the electrical power centre and a forward‑cargo relay panel per Fokker Service Bulletin F50‑24‑A013 Rev 2 (or later). The measure prevents overheating, smoke, or fire after a similar Fokker 100 incident.\n\nIt applies to the listed serial‑numbered F50s and carried a compliance deadline of 21 January 1990."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 altered administrative details—effectivity, compliance wording and the cited Requirement document revision—but the directive states it \"generates no additional work.\" The substantive scope of mandated inspections and torque adjustments remains as originally issued (Amendment 1; Requirement; Background)."},"complexity_factors":["Narrow applicability by serial number limits the affected fleet but requires accurate aircraft identification (Applicability).","Mandatory reliance on an external manufacturer document (Fokker Service Bulletin F50-24-A013 Rev 2 or later) means implementers must obtain and follow that bulletin (Requirement).","A firm compliance deadline creates scheduling and logistical pressure on operators and maintenance organisations (Compliance: Prior to 21 January 1990).","Technical nature of work (inspection and torque adjustment of terminal blocks/contactors in EPC and relay panel) requires qualified maintenance personnel and appropriate tooling (Background/Requirement).","Cross-reference to an overseas airworthiness directive introduces potential coordination or duplication considerations (Note: RLD Airworthiness Directive BLA 89-159 Issue 2).","Administrative amendment adjusted effectivity, compliance and document revision status while stating no additional work was generated (Amendment 1), which raises small administrative complexity without changing technical tasks."],"plain_english_summary":"AD requires operators of certain Fokker F50 (F27 Mk50) aeroplanes to inspect and, if needed, re-torque terminal blocks and contactors in the electrical power centre and the forward cargo relay panel. The work must follow Fokker Service Bulletin F50-24-A013 Revision 2 (or later) and be completed by 21 January 1990. CASA issues the directive; aircraft operators/maintainers pay for and must change maintenance actions to meet the specified torque values."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values","history":"/api/acts/ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values/history","analysis":"/api/acts/ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values/analysis","conflicts":"/api/acts/ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values/conflicts","importantCases":"/api/acts/ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values/important-cases","documents":"/api/acts/ad-f50-32-amdt-1-electrical-power-terminal-block-and-contactor-torque-values/documents"}}