{"id":"F2008L04463","name":"AD/B747/386 - EFIS/ECAS Interface Units","slug":"ad-b747-386-efis-ecas-interface-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76467,"registerId":"commonwealth-F2008L04463-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/386 | EFIS/ECAS Interface Units | 13/2008 |\n| ----------- | ------------------------- | ------- |\n\n| Applicability: | Model 747-400, 747-400D and 747- 400F series aeroplanes, as identified in Boeing Service Bulletin (SB) 747-31-2368, Revision 1, dated 24 July 2006.                                                                                                                                                                                                                                                                                                        |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Replace at least one of the three electronic flight instrument system/engine indicating and crew alerting system (EFIS/EICAS) interface units (EIU), part number (P/N) 622-8589-104, located on the E2-6 shelf of the main equipment centre with a new or modified EIU, P/N 622-8589-105, in accordance with the Accomplishment Instructions of SB 747-31-2368, Revision 1.                                                                                |\n|                | Note 1: SB 747-31-2368, Revision 1, refers to Rockwell Collins Service BulletinEIU-7000-31-502, dated 21 March 2006, as an additional source of service information for modifying an EIU by adding auto restart circuitry, which converts EIU P/N 622-8589-104 to P/N 622-8589-105.                                                                                                                                                                        |\n|                | Actions accomplished before the effective date of this Directive in accordance with Boeing SB 747-31-2368, dated 22 November 2005 (Revision 1 of the service bulletin specifies that the original issue is dated 1 December 2005), are considered acceptable for compliance with the corresponding requirements of this Directive.                                                                                                                         |\n|                | Later revisions of the above SB(s), approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-22, are considered acceptable for compliance with the equivalent Requirements of this Directive.                                                                                                                                                                                     |\n|                | Replacing an EIU with a new or modified EIU in accordance with Requirement 1 of this Directive constitutes terminating action for the EIU replacement (Requirement 3 of AD/B747/308 or paragraph (d)(1) of FAA AD 2004-10-05), provided that the other two EIUs are replaced with EIUs having P/N 622-8589-104 or P/N 622-8589-105. All other actions required by Requirement 1 of AD/B747/308 or paragraph (d)(1) of AD 2004-10-05 must be complied with. |\n|                | Note: FAA AD 2008-13-22 Amdt 39-15585 refers.                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Compliance:    | Within 24 months after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 18 December 2008.                                                                                                                                                                                                                                                                                                                                                                                        |\n\n| Background: | This Directive results from two instances where all six integrated display units (IDUs) on the flight deck panels went blank in flight. The Directive is issued to prevent loss of the IDUs due to failure of all three EFIS/EICAS EIUs, which could result in the inability of the flightcrew to maintain safe flight and landing of the aeroplane. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n6 November 2008","sortOrder":0},{"sectionNumber":"AD/B747/386","sectionType":"part","heading":"AD/B747/386","content":"## AD/B747/386","sortOrder":1},{"sectionNumber":"EFIS/ECAS Interface Units","sectionType":"part","heading":"EFIS/ECAS Interface Units","content":"## EFIS/ECAS Interface Units","sortOrder":2},{"sectionNumber":"13/2008","sectionType":"part","heading":"13/2008","content":"## 13/2008","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope does not expand beyond the identified 747-400 series aeroplanes named in Boeing SB 747-31-2368. The Directive accepts prior Boeing SB compliance and FAA‑approved AMOCs and provides terminating action for certain earlier EIU-replacement requirements, so it aligns with and clarifies existing AD obligations rather than changing their substantive scope."},"complexity_factors":["Technical hardware change: requires fitting or modifying EIUs (part numbers 622-8589-104 → 622-8589-105) and may use Rockwell Collins SB for auto-restart circuitry.","Part-number and configuration dependency: compliance and terminating action depend on specific P/N combinations across the three EIUs.","Interlocking ADs and prior compliance: references and potentially terminates requirements in earlier AD/B747/308 and FAA ADs, creating cross-document dependencies.","Service bulletin control and AMOCs: later SB revisions are acceptable only if FAA‑approved as AMOC to FAA AD 2008-13-22, introducing regulatory coordination.","Fleet applicability limited to aircraft identified in Boeing SB 747-31-2368, requiring operators to check SB applicability before action.","Fixed compliance window (24 months) creates scheduling and logistics pressure for parts procurement and maintenance slots."],"plain_english_summary":"This directive requires operators of certain Boeing 747‑400 series aeroplanes to replace at least one of the three EFIS/EICAS interface units (EIUs) P/N 622‑8589‑104 with a new or modified EIU P/N 622‑8589‑105 within 24 months, using Boeing Service Bulletin 747‑31‑2368. \n\nIt aims to prevent complete flight‑deck display loss; operators pay for parts and labour, must follow the prescribed service bulletins (FAA‑approved revisions accepted), and the replacement can terminate earlier EIU‑replacement obligations if the remaining units are the specified part‑numbers."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific hardware defect in specific Boeing 747 variants. The references to prior directives and alternate compliance methods are standard aviation safety continuity provisions, not scope expansion."},"complexity_factors":["Multiple cross-references to external documents (Boeing Service Bulletin 747-31-2368, Rockwell Collins Service Bulletin EIU-7000-31-502, FAA AD 2008-13-22, and previous Australian AD/B747/308)","Conditional compliance pathways — accepts prior work done under different document versions as valid","Nested terminating action logic — the replacement terminates requirements from a previous directive only if specific conditions are met regarding the other two units","Technical aviation terminology requiring specialized knowledge (part numbers, shelf locations like \"E2-6\", specific aircraft models)","Dual regulatory framework references — coordinates with US FAA directives and allows FAA-approved alternate methods"],"plain_english_summary":"This AD requires operators of certain Boeing 747-400 series aircraft fitted with EIU P/N 622-8589-104 to replace at least one interface unit with the improved P/N 622-8589-105 within 24 months of 18 Dec 2008. It prevents total blanking of all six flight displays (seen in two in‑flight events) by restoring automatic restart capability, and removes the need for the previous repetitive inspections once complied with."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-386-efis-ecas-interface-units","history":"/api/acts/ad-b747-386-efis-ecas-interface-units/history","analysis":"/api/acts/ad-b747-386-efis-ecas-interface-units/analysis","conflicts":"/api/acts/ad-b747-386-efis-ecas-interface-units/conflicts","importantCases":"/api/acts/ad-b747-386-efis-ecas-interface-units/important-cases","documents":"/api/acts/ad-b747-386-efis-ecas-interface-units/documents"}}