{"id":"F2006B09429","name":"AD/ELECT/55 Amdt 2 - Texas Instruments Circuit Breakers","slug":"ad-elect-55-amdt-2-texas-instruments-circuit-breakers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53830,"registerId":"commonwealth-F2006B09429-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ELECT/55 Amdt 2 - Texas Instruments Circuit Breakers","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nElectrical Equipment\n\nAD/ELECT/55\n\nAmdt 2\n\n  \nTexas Instruments Circuit Breakers 8/93\n\nApplicability: Texas Instruments three phase circuit breakers models 6TC6-7.5; 6TC6-10; 6TC20-\n\n7.5 and 6TC20-10 date coded 8150 or earlier.\n\nNote: Aircraft known to have these circuit breakers installed include, but are not limited to, aircraft manufactured by Boeing Commercial Airplanes and Lockheed Corporation.\n\nRequirement: If not previously accomplished inspect the circuit breakers listed above to determine the date code. If the date code is 8150 or earlier, replace the circuit breaker.\n\nNote: FAA AD 90-09-10, Boeing SBs 747-24-2135, 757-24-0054, 767-24-0060, and\n\nLockheed SB 093-24-134 refer.\n\nCompliance: The Compliance for the previous issue of this Directive was prior to 12 November 1990. Compliance for this issue is prior to 22 October 1993.\n\nBackground: Some aircraft have experienced inflight fires which have been attributed to overheating of Texas Instruments circuit breakers. Compliance with this AD is considered necessary to prevent potential overheating of these affected circuit breakers which could result in an onboard fire.\n\nAmendment 1 to this Directive was issued to correct a typographical error only. Amendment 2 is issued to correct errors in the reference documentation and to clarify the requirement.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: addressing the fire risk from specific Texas Instruments circuit breakers. Amendment 2 only corrects documentation errors and clarifies requirements — it does not expand the scope to new aircraft, new part numbers, or new safety issues."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 specific part numbers affected","Single clear requirement: inspect date code, replace if 8150 or earlier","Minimal defined terms (only standard aviation terminology like 'Applicability' and 'Compliance')","No nested exceptions or conditional logic beyond the date code check","Straightforward compliance deadline with clear replacement of previous deadline"],"plain_english_summary":"This AD mandates inspection and, if necessary, replacement of certain Texas Instruments three‑phase circuit breakers (models 6TC6‑7.5, 6TC6‑10, 6TC20‑7.5, 6TC20‑10) with date codes 8150 or earlier after reports of overheating and inflight fires. It affects operators of aircraft using those breakers (notably many Boeing 747/757/767 and Lockheed types) and requires compliance before 22 October 1993. Amendment 2 corrects reference errors and clarifies the actions required."},"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":2,"scope_assessment":{"changed":false,"description":"Amendment 2 corrects reference documentation and clarifies the Requirement (Amendment note) but does not change the core applicability or mandated action: inspect specified circuit breakers and replace those date coded 8150 or earlier by the stated compliance date (Applicability, Requirement, Compliance)."},"complexity_factors":["Narrow technical scope: specific models and a single date code threshold (Applicability, Requirement).","Single clear compliance action: inspect and replace affected breakers (Requirement).","Firm compliance deadline that is historically fixed (Compliance: prior to 22 October 1993).","Cross-references to FAA and manufacturer service bulletins for identification/repair details (Note).","Operational impact limited to aircraft where these breakers are installed; identification may require physical inspection (Applicability, Requirement)."],"plain_english_summary":"This Directive requires aircraft operators to inspect specified Texas Instruments three‑phase circuit breakers (models 6TC6‑7.5; 6TC6‑10; 6TC20‑7.5; 6TC20‑10) and replace any with a date code of 8150 or earlier by 22 October 1993. It applies to aircraft fitted with those breakers, including some Boeing and Lockheed types. The Directive’s stated purpose is to prevent overheating and inflight fires; operators must carry out inspections and replace affected breakers by the stated deadline, incurring inspection and replacement costs. See the Requirement, Applicability, Compliance and Background sections for authority and timing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-55-amdt-2-texas-instruments-circuit-breakers","history":"/api/acts/ad-elect-55-amdt-2-texas-instruments-circuit-breakers/history","analysis":"/api/acts/ad-elect-55-amdt-2-texas-instruments-circuit-breakers/analysis","conflicts":"/api/acts/ad-elect-55-amdt-2-texas-instruments-circuit-breakers/conflicts","importantCases":"/api/acts/ad-elect-55-amdt-2-texas-instruments-circuit-breakers/important-cases","documents":"/api/acts/ad-elect-55-amdt-2-texas-instruments-circuit-breakers/documents"}}