{"id":"F2006L00127","name":"AD/B767/216 - Frequency Converters - Medical and Galley Utility Outlets","slug":"ad-b767-216-frequency-converters-medical-and-galley-utility-outlets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58005,"registerId":"commonwealth-F2006L00127-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/216 | Frequency Converters - Medicaland Galley Utility Outlets | 2/2006 |\n| ----------- | -------------------------------------------------------- | ------ |\n\n| Applicability: | Model 767-300 series aeroplanes, identified in Boeing Service Bulletin (SB) 767-25-0334, Revision 1, dated 19 June 2003.                                                                                                                                                               |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. If not previously accomplished, either:                                                                                                                                                                                                                                             |\n|                | a. Replace the frequency converters used to supply power for medical and galley utility outlets with modified frequency converters in accordance with the Accomplishment Instructions of SB 767-25-0334 Revision 1.                                                                    |\n|                | or                                                                                                                                                                                                                                                                                     |\n|                | b. Remove and deactivate the frequency converters used to supply power for medical and galley utility outlets, and cap and stow the frequency converter wire bundles, in accordance with paragraphs B.1. through B.6. of the Accomplishment Instructions of SB 767-25-0334 Revision 1. |\n|                | Actions accomplished before the effective date of this Directive in accordance with SB 767-25-0334, dated 7 November 2002, are acceptable for compliance with Requirement 1.                                                                                                           |\n|                | Later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2005-24-04, are considered acceptable for compliance with the equivalent Requirements of this Directive.                    |\n|                | 2. Frequency converters that have not been modified in accordance with the Accomplishment Instructions of the service bulletin may not be installed as a replacement spare.                                                                                                            |\n|                | Note: FAA AD 2005-24-04 Amdt 39-14384 refers.                                                                                                                                                                                                                                          |\n| Compliance:    | For Requirement 1 - Within 18 months after the effective date of this Directive.                                                                                                                                                                                                       |\n|                | For Requirement 2 - As of the effective date of this Directive.                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 16 February 2006.                                                                                                                                                                                                                    |\n\n| Background: | The FAA has received a report indicating that a hard short circuit condition between the output of certain frequency converters and their downstream circuit breakers will produce a continuous output current that could cause the undersized output wiring to overheat when the frequency converters fail to shut off.                                                                                                              |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | This Directive is issued to prevent overheating of the output wiring of the frequency converters, which could result in the failure of a wire bundle and consequent adverse effects on other systems sharing the affected wire bundle. This Directive requires either the replacing of the frequency converters used to supply power for medical and galley utility outlets with modified frequency converters or their deactivation. |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n16 December 2005","sortOrder":0},{"sectionNumber":"AD/B767/216","sectionType":"part","heading":"AD/B767/216","content":"## AD/B767/216","sortOrder":1},{"sectionNumber":"Frequency Converters - Medicaland Galley","sectionType":"part","heading":"Frequency Converters - Medicaland Galley Utility Outlets","content":"## Frequency Converters - Medical  \nand Galley Utility Outlets","sortOrder":2},{"sectionNumber":"2/2006","sectionType":"part","heading":"2/2006","content":"## 2/2006","sortOrder":3}],"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":3,"scope_assessment":{"changed":false,"description":"The directive implements the FAA safety objective stated in the Background—to prevent output-wiring overheating from converter failures—without expanding applicability beyond the aeroplanes identified in Boeing SB 767-25-0334. It preserves the FAA's corrective options (replacement or deactivation), accepts prior compliance under the earlier SB, and allows FAA‑approved later SB revisions as alternate compliance (Requirement; Note; Background; Compliance)."},"complexity_factors":["Two explicit compliance paths offered (Requirement 1(a): replace with modified converters; Requirement 1(b): remove/deactivate and stow wiring) which require different technical actions.","Ban on installing unmodified spare converters (Requirement 2) imposes an immediate parts-control obligation.","Work must be performed in accordance with Boeing Service Bulletin 767-25-0334 Accomplishment Instructions, requiring technical maintenance procedures and access to SB details.","Fixed compliance deadline of 18 months creates scheduling and potential operational-downtime pressures (Compliance).","Accepts actions done under earlier SB dated 7 Nov 2002 and later FAA‑approved SB revisions as alternate methods of compliance, creating a need to track FAA approvals and AMOCs (Requirement/Note).","Applicability is limited to aircraft identified in the specified SB, so operators must identify affected fleet members precisely (Applicability).","Safety rationale is technical (hard short causing continuous current and wiring overheating) and ties compliance to a specific failure mode (Background)."],"plain_english_summary":"This directive requires operators of Boeing 767-300 aeroplanes identified in Boeing Service Bulletin 767‑25‑0334 to either fit modified frequency converters for medical and galley utility outlets or deactivate and stow the existing converters; it also prohibits installing unmodified spare converters (Requirement 1–2). The stated aim is to prevent output-wiring overheating if a converter fails (Background). Aircraft operators must arrange and pay for the work within 18 months; later FAA‑approved SB revisions are acceptable alternate compliance (Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific identified safety defect in a particular aircraft system. The scope remains precisely limited to the wiring overheating risk in Boeing 767-300 frequency converters as originally identified by the FAA."},"complexity_factors":["Single, discrete technical subject matter (frequency converters on one aircraft series)","Only 2 substantive requirements with clear binary compliance options (replace OR deactivate)","Minimal defined terms (only standard aviation acronyms like AMOC, FAA, SB)","No nested exceptions or conditional logic beyond the initial applicability test","Straightforward compliance timeline (18 months for Requirement 1, immediate for Requirement 2)","Cross-references limited to one specific Boeing Service Bulletin and one FAA AD","Document is approximately 400 words of operative text"],"plain_english_summary":"This AD requires operators of certain Boeing 767-300s to mitigate a wiring fire risk from faulty frequency converters that can short and overheat wiring. Within 18 months each affected aircraft must either have the converters replaced with modified, safer units or have them permanently disabled and removed; unmodified converters may not be installed as spares. It affects airlines/operators using the specified Boeing service bulletin and prevents potential in‑flight electrical fires."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-216-frequency-converters-medical-and-galley-utility-outlets","history":"/api/acts/ad-b767-216-frequency-converters-medical-and-galley-utility-outlets/history","analysis":"/api/acts/ad-b767-216-frequency-converters-medical-and-galley-utility-outlets/analysis","conflicts":"/api/acts/ad-b767-216-frequency-converters-medical-and-galley-utility-outlets/conflicts","importantCases":"/api/acts/ad-b767-216-frequency-converters-medical-and-galley-utility-outlets/important-cases","documents":"/api/acts/ad-b767-216-frequency-converters-medical-and-galley-utility-outlets/documents"}}