{"id":"F2006B03077","name":"AD/B747/175 Amdt 1 - Door Switch Replacement","slug":"ad-b747-175-amdt-1-door-switch-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42436,"registerId":"commonwealth-F2006B03077-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/175 Amdt 1 - Door Switch Replacement","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 747 Series Aeroplanes\n\nAD/B747/175\n\nAmdt 1\n\n  \nDoor Switch Replacement 4/98\n\nApplicability: All B747 \\-100, \\-200 and \\-300 series aeroplanes as listed in Boeing Alert Service Bulletin (ASB) 747-33A2252 Revision 2 dated 4 December 1997.\n\nRequirement: 1. Replace switches S4 and/or S5 or S7 and S8, as applicable, that are installed in the cabin attendant’s panel, at Door 4 right, and the equivalent switches at Door 2 right with new items in accordance with the procedures specified in Boeing ASB 747- 33A2252 Revision 2.\n\n2. Switches, having part numbers identified in the ‘Old Switch’ column of any table contained in Boeing ASB 747-33A2252 Revision 2 shall not to be installed at Door 2 Right or at Door 4 Right of any aeroplane.\n\nNote: FAA AD 97-08-05 Amdt 39-9993 refers.\n\nCompliance: 1. Prior to 26 April 1998.\n\n2. Subsequent to 26 March 1998.\n\nThis amendment becomes effective on 26 March 1998.\n\nBackground: Amendment 1 to this AD changes the Boeing Service Bulletin reference. The original reference did not detail the procedure for door 2 Right.\n\nReports have been received by the FAA that fires have occurred on some aeroplanes due to the internal failure of some of these switches. The actions specified by this AD are intended to prevent the installation and use of switches that could short circuit when they fail, and consequently cause smoke and fire aboard the aeroplane.\n\nThe original issue of this airworthiness directive became effective on 19 June 1997.","sortOrder":0}],"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":true,"description":"Amendment 1 updates the Boeing Service Bulletin reference to Revision 2 and adds the procedure for Door 2 Right that the original reference omitted, thereby expanding and clarifying the original AD's operational scope to explicitly include Door 2 Right and the related prohibition on old parts (Background; Requirement 1; Requirement 2)."},"complexity_factors":["Applicability to multiple B747 sub‑series and reliance on an external Boeing Alert Service Bulletin for detailed procedures (Applicability; Requirement 1).","Technical maintenance action (physical replacement of switches) requiring licensed maintenance staff and adherence to the ASB procedures (Requirement 1).","Two distinct compliance timings: mandatory completion date for replacements and an effective ban date for old parts (Compliance).","Prohibition on reinstalling listed 'Old Switch' part numbers imposes inventory control and parts-tracking obligations on operators (Requirement 2).","Regulatory cross-reference to FAA AD 97-08-05 creates a need to coordinate compliance records across jurisdictions (Note).","Limited administrative discretion: mandatory airworthiness directive leaves operators no substantive choice about whether to comply, only when and how (Requirement; Compliance).","Operational/logistical burdens on operators for parts procurement and scheduling aircraft downtime (implied by Requirement 1 and Compliance)."],"plain_english_summary":"**Requires specified cabin-attendant door switches on Boeing 747‑100/‑200/‑300 aircraft to be replaced and forbids reinstallation of listed old switch part numbers, using Boeing ASB 747-33A2252 Revision 2.** The measure is intended to prevent internal switch failures that can short‑circuit and cause smoke or fire; aircraft operators pay for and must complete the replacements by 26 April 1998 and stop fitting banned switches after 26 March 1998."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original directive only covered Door 4 Right. Amendment 1 expands scope to also cover Door 2 Right, doubling the physical locations where switches must be replaced. The background explicitly states this expansion was necessary because the original Boeing Service Bulletin reference did not detail the procedure for Door 2 Right."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 defined switch identifiers (S4, S5, S7, S8)","Single external reference to Boeing Service Bulletin 747-33A2252 Revision 2","Simple two-part requirement structure with clear applicability","No nested exceptions or conditional logic","Straightforward compliance dates with no alternative methods"],"plain_english_summary":"This safety order requires Australian operators of Boeing 747‑100/200/300 aircraft to replace specific cabin attendant door switches on the right side (Doors 2 and 4) because the old switches can short circuit and cause smoke or fire. Reinstallation of the old switches is banned from 26 March 1998; replacements must be completed by 26 April 1998. Amendment 1 adds Door 2 Right to the original requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-175-amdt-1-door-switch-replacement","history":"/api/acts/ad-b747-175-amdt-1-door-switch-replacement/history","analysis":"/api/acts/ad-b747-175-amdt-1-door-switch-replacement/analysis","conflicts":"/api/acts/ad-b747-175-amdt-1-door-switch-replacement/conflicts","importantCases":"/api/acts/ad-b747-175-amdt-1-door-switch-replacement/important-cases","documents":"/api/acts/ad-b747-175-amdt-1-door-switch-replacement/documents"}}