{"id":"F2006B03378","name":"AD/B767/203 - Transformer Rectifier Unit - Ground Bracket","slug":"ad-b767-203-transformer-rectifier-unit-ground-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42841,"registerId":"commonwealth-F2006B03378-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\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 CASR 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\nBoeing 767 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B767/203 Transformer Rectifier Unit -","sectionType":"part","heading":"AD/B767/203 Transformer Rectifier Unit - Ground Bracket 2/2005","content":"# AD/B767/203 Transformer Rectifier Unit \\- Ground Bracket 2/2005\n\nDM\n\nApplicability: Boeing Model 767-200, \\-300 and \\-300F series aeroplanes, as listed in Boeing Alert Service Bulletin (ASB) 767-24A0119, Revision 2, dated 19 August 2004 on which the actions of Boeing Service Bulletin 767-24-0119, dated 14 May 1998 and/or Revision 1, dated 16 December 1999 have been accomplished.\n\nRequirement: Rework the ground stud bracket of the transformer rectifier unit (TRU) and structure mounting surface, together with measuring the resistance from the bracket to the structure and the grounding lug to the bracket using a bonding meter, in accordance with the Accomplishment Instructions of ASB 767-24A0119 Revision 2, as revised by Boeing Information Notice 767-24A0119 IN 01, dated 21 October 2004, except that collars with part number (P/N) BACC30BL6 (as listed in paragraph 2.C. \"Parts Necessary For Each Aeroplane\" of the ASB) may be used in lieu of collars P/N BACC30M6 specified in Step 4, Sheet 3 of Figure 1 of the accomplishment Instructions.\n\nNote: FAA AD 2004-23-14 Amdt 39-13869 refers.\n\nCompliance: Within 45 days after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 15 December 2004.\n\nBackground: The United States Federal Aviation Administration (FAA) has received a report of loss of all direct current (DC) power generation during a flight, due to inadequate electrical ground path between the ground bracket of the TRU and the structure. This Directive is issued to prevent depletion of the main battery and consequent loss of all DC power, which could cause the loss of flight critical systems and requires the reworking the surface of the ground stud brackets of the TRU and the aeroplane structure mounting surface, together with the measurement of the resistance from the bracket to the structure and the ground lug to the bracket.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\n![](image.001.png)Delegate of the Civil Aviation Safety Authority 3 December 2004","sortOrder":1}],"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":4,"scope_assessment":{"changed":false,"description":"The Directive retains a narrow, corrective scope: rework and resistance measurement for the TRU ground bracket on the specific Boeing 767s listed in ASB 767-24A0119 Rev 2 where prior SB work was done (Applicability; Requirement). It modifies implementation details (e.g. permits a specific collar part substitution and cites an Info Notice) but does not broaden the set of affected aircraft or add new categories of obligation beyond the described rework and testing (Requirement; Note)."},"complexity_factors":["Technical nature of the work: requires mechanical rework of TRU ground stud bracket and aircraft structure plus electrical resistance measurements using a bonding meter (Requirement; Background).","Cross-references to manufacturer documents: compliance must follow Boeing ASB 767-24A0119 Revision 2 and Boeing Information Notice 767-24A0119 IN 01 (Requirement), adding procedural dependency.","Limited applicability: only applies to aircraft listed in the ASB and where earlier Boeing Service Bulletin 767-24-0119 or its Revision 1 have been accomplished (Applicability), creating a conditional applicability filter.","Parts substitution clause: allows use of collars P/N BACC30BL6 instead of P/N BACC30M6 (Requirement), introducing a narrow materials exception to the accomplishment steps.","Short mandatory timeframe: operators must comply within 45 days of the AD’s effective date (Compliance), increasing scheduling and logistical pressure.","Measurement and verification reliance: the AD directs resistance measurements but defers detailed acceptance criteria and detailed steps to the ASB/Info Notice (Requirement), so compliance depends on following those referenced instructions precisely.","Regulatory overlap: note referring to FAA AD 2004-23-14 creates an external audit/verification linkage (Note), which may affect recordkeeping or bilateral oversight."],"plain_english_summary":"This Directive requires operators of certain Boeing 767-200, -300 and -300F aeroplanes (those listed in Boeing ASB 767-24A0119 Revision 2 and on which earlier SB actions were done) to rework the transformer rectifier unit (TRU) ground-stud bracket and the aircraft mounting surface and to measure grounding resistance with a bonding meter. Compliance is mandatory within 45 days. The stated aim is to prevent depletion of the main battery and consequent loss of all DC power by restoring a reliable ground path."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific unsafe electrical grounding condition in Boeing 767 TRU units. It does not expand beyond the original safety purpose of preventing DC power loss."},"complexity_factors":["Single specific technical requirement with clear cross-reference to Boeing service bulletin","One explicit exception/modification allowed (alternative part number BACC30BL6 in lieu of BACC30M6)","Limited applicability criteria (specific aircraft models + previous SB accomplishment)","Simple compliance timeframe (45 days from effective date)","No nested conditional logic or multiple alternative compliance paths","Short document (approximately 300 words) with single purpose","Technical aviation terminology requires domain knowledge but is standard for the field"],"plain_english_summary":"This CASA Airworthiness Directive orders operators of certain Boeing 767-200/-300/-300F aircraft (specifically those that already had SB 767-24-0119 applied) to rework a TRU ground-stud bracket and mounting surface and verify bonding with a resistance test within 45 days of 15 Dec 2004. It addresses a poor ground path that could cause total DC power loss in flight — a proven hazard that risks loss of critical systems and passenger safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-203-transformer-rectifier-unit-ground-bracket","history":"/api/acts/ad-b767-203-transformer-rectifier-unit-ground-bracket/history","analysis":"/api/acts/ad-b767-203-transformer-rectifier-unit-ground-bracket/analysis","conflicts":"/api/acts/ad-b767-203-transformer-rectifier-unit-ground-bracket/conflicts","importantCases":"/api/acts/ad-b767-203-transformer-rectifier-unit-ground-bracket/important-cases","documents":"/api/acts/ad-b767-203-transformer-rectifier-unit-ground-bracket/documents"}}