{"id":"F2006B03338","name":"AD/B767/161 - Engine Strut Wire Bundles","slug":"ad-b767-161-engine-strut-wire-bundles","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42775,"registerId":"commonwealth-F2006B03338-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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 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\n![](image.001.png)\n\nBoeing 767 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B767/161 Engine Strut Wire Bundles 2/","sectionType":"part","heading":"AD/B767/161 Engine Strut Wire Bundles 2/2002","content":"# AD/B767/161 Engine Strut Wire Bundles 2/2002\n\nApplicability: Model 767 series aeroplanes, line numbers 1 through 821 inclusive, equipped with Pratt & Whitney PW4000 series engines.\n\nRequirement: 1. Perform a one-time detailed visual inspection of the wire bundles located in the aft section of the strut forward fairing panel of both engine struts to detect chafing damage, per Boeing Service Bulletin (SB) 767-73A0049, Revision 3, dated 20 December 2000, or Revision 4, dated 5April 2001.\n\nInspections accomplished prior to the effective date of this Directive per SB 767- 73A0049, Revision 2, dated 27 April 2000, or per Boeing Standard Wiring Practices Manual D6-73A0049, Subject 20-10-13 or 20-30-12, are acceptable for compliance with the applicable action specified in this Directive.\n\nNote 1: For the purposes of this Directive, a detailed visual inspection is defined as: \"An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.''\n\n    2. If chafing damage of any wire bundle is detected during the Requirement 1 inspection, repair the bundle in accordance with SB 767-73A0049, Revision 3 or Revision 4.\n\n    3. Replace all wires that were repaired by splicing, in accordance with Requirement 2, with new wires per SB 767-73A0049, Revision 3 or Revision 4.\n\nNote 2: Any of the Type 2 tapes listed in Boeing Standard Wiring Practices Manual D6-54446, Subject 20-00-11, dated 1 May 2000, are acceptable alternatives to the TFE-2X Teflon wrap specified in Figure 1 of Boeing SB 767-73A0049, Revision 3 or Revision 4.\n\n    4. Carry out the following actions in accordance with the Accomplishment Instructions of Boeing SB 767-73-0051, dated 20 December 2000.\n\n    Visually inspect the wire bundles to detect chafing damage; if any damaged wires are found, replace the wires that require a splice repair with new wires.\n\n    b. Replace the existing support bracket of the wire bundle with a new bridge bracket, support bracket, and wire bundle clamps.","sortOrder":1},{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"part","heading":"Boeing 767 Series Aeroplanes","content":"## Boeing 767 Series Aeroplanes\n\nAD/B767/161 (continued)\n\n    5. Report inspection results, as described in SB 767-73A0049, Revision 3 or Revision 4, to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124-2207 USA.\n\n    6. Support brackets located in the aft section of the strut forward fairing panel of either engine strut, as identified in the \"Existing Part Number'' column of Paragraph 2.E. of Boeing SB 767-73-0051, may not be installed on any aeroplane.\n\nNote 3: FAA AD 2001-24-01 Amdt 39-12517 refers.\n\nCompliance: For Requirement 1 - Prior to the accumulation of 10,000 hours time-in-service (TIS) or within 180 days after the effective date of this Directive, whichever occurs later.\n\nFor Requirement 2 - Before further flight, immediately following the Requirement 1 inspection.\n\nFor Requirement 3 \\- Concurrent with Requirement 4.\n\nFor Requirement 4 - Within 6,000 hours TIS or 18 months after the effective date of this Directive, whichever occurs later.\n\nFor Requirement 5 - Within 10 days after accomplishing the actions required by Requirements 1 or 4.\n\nFor Requirement 6 \\- As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 21 February 2002.\n\nBackground: This Directive requires a one-time detailed visual inspection of certain wire bundles located in the aft section of the strut forward fairing panel of both engine struts to detect chafing damage and, if necessary, repair or replacement of wiring. The Directive also requires replacement of wires repaired by splicing and damaged wires that require splicing, and replacement of the support brackets of the existing wire bundles with new brackets and clamps.","sortOrder":2}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive's scope aligns with its stated safety purpose: it applies only to Boeing 767 aeroplanes line numbers 1–821 with PW4000 engines (Applicability) and limits action to specified wire bundles and support brackets. It prescribes inspection, repair/replacement, bracket retrofit, reporting, and a prohibition on listed existing brackets (Requirements 1–6; Compliance). No provision expands coverage beyond the described airplanes or wiring locations; rather, it adds procedural, parts and reporting obligations consistent with the Directive's background rationale."},"complexity_factors":["Technical inspection and repair standards: Requires a 'detailed visual inspection' with defined aids and possible surface cleaning (Note 1), which raises skill and access requirements.","Multiple, staggered compliance deadlines: Different actions have different windows (Requirement 1: 10,000 TIS or 180 days; Requirement 4: 6,000 TIS or 18 months; reporting within 10 days, etc.), increasing scheduling complexity (Compliance section).","Interdependent actions: Detection of chafing triggers immediate repairs (Requirement 2) and replacement of any spliced wires with new wires (Requirement 3), creating chained workscopes and parts needs.","Parts change and prohibition: Mandates replacement of existing support brackets with specific new bridge/support brackets and clamps (Requirement 4) and prohibits installation of listed existing bracket part numbers (Requirement 6), affecting spares and maintenance inventory.","External normative references: Compliance depends on multiple Boeing Service Bulletins and Standard Wiring Practices Manuals (SB 767-73A0049 Revs 2–4; SB 767-73-0051; D6-54446), so operators must obtain and follow those documents.","Reporting obligation: Requires results reporting to Boeing within 10 days (Requirement 5), adding administrative burden and potential data-sharing obligations.","Acceptance of prior work: Allows prior inspections done under earlier SB revision or specified wiring practice manuals to satisfy the AD (Requirement 1), requiring record checks to confirm acceptability.","Safety-consequence linkage: The AD is framed to prevent dual wire faults that could produce inadvertent thrust overboost, loss of thrust, or engine shutdown (Background), which ties maintenance action to operational safety risk and possible grounding decisions.","Cross-regulatory alignment: AD notes an FAA AD reference (Note 3), which may affect multinational operator compliance coordination."],"plain_english_summary":"This AD requires operators of Boeing 767s (line nos 1–821) with Pratt & Whitney PW4000 engines to perform a one‑time detailed inspection of specific engine‑strut wire bundles, repair or replace chafed wires (including replacing any spliced wires with new wiring), install new support brackets and clamps, and report results to Boeing; certain existing brackets are prohibited. It targets chafing that can cause dual wire faults and engine thrust or shutdown hazards and creates inspection, repair, parts and scheduling costs for operators."},"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":4,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a focused, single-purpose scope: addressing unsafe wiring conditions in specific Boeing 767 engine struts. The document maintains its original safety intent without scope creep."},"complexity_factors":["Multiple compliance deadlines tied to different requirements (flight hours vs calendar dates, 'whichever occurs later' calculations)","Cross-references to external Boeing Service Bulletins (SB 767-73A0049 Revisions 3 and 4, SB 767-73-0051) and the Boeing Standard Wiring Practices Manual","Conditional logic: Requirement 2 only applies 'if chafing damage is detected', Requirement 3 applies to wires 'repaired by splicing' in Requirement 2","Technical aviation terminology requiring specialized knowledge (TIS/time-in-service, TFE-2X Teflon wrap, strut forward fairing panel, splicing)","Acceptable alternative compliance paths (Revision 2 inspections, Standard Wiring Practices Manual methods, Type 2 tapes as alternatives)","Nested applicability: limited to specific model series, specific line numbers (1-821), and specific engine type (Pratt & Whitney PW4000)"],"plain_english_summary":"This CASA safety order requires operators of Boeing 767s (line numbers 1–821) with Pratt & Whitney PW4000 engines to inspect and repair wiring in the engine struts, replace previously spliced wires and old support brackets, and report findings to Boeing. \n\nIt addresses chafed or damaged wires that could cause engine power surges, loss of thrust, or shutdowns, reducing the risk of hazardous in-flight or takeoff incidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-161-engine-strut-wire-bundles","history":"/api/acts/ad-b767-161-engine-strut-wire-bundles/history","analysis":"/api/acts/ad-b767-161-engine-strut-wire-bundles/analysis","conflicts":"/api/acts/ad-b767-161-engine-strut-wire-bundles/conflicts","importantCases":"/api/acts/ad-b767-161-engine-strut-wire-bundles/important-cases","documents":"/api/acts/ad-b767-161-engine-strut-wire-bundles/documents"}}