{"id":"F2007L02185","name":"AD/B747/170 Amdt 1 - Main Entry Door Girt Bar Support Fitting","slug":"ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67417,"registerId":"commonwealth-F2007L02185-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/B747/170 Amdt 1 | Main Entry Door Girt Bar Support Fitting | 8/2007 |\n| ------------------ | ---------------------------------------- | ------ |\n\n| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -300, -400, -400D, 747SR, and 747SP series aircraft; line numbers 1 through 868.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2007-12-11 Amdt 39-15089.Note: Boeing Service Bulletins 747-53A2378 Revision 1 and Revision 3, refer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of2 August 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Amendment becomes effective on 2 August 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | The FAA received reports of corrosion on the floor structure supports for the escape slides of the main deck entry doors. The corrosion was found during scheduled deployment tests of the main entry door escape slides. Uncontrolled corrosion could result in separation of the escape slide from the lower door sill during deployment, and subsequently prevent proper operation during an emergency.Amendment 1 is issued in response to a new FAA AD, which results from a report that the square and conical washers may be installed incorrectly in the girt bar support fitting on aircraft on which the support fitting was repaired or replaced, in accordance with the requirements of the original AD. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 June 2007","sortOrder":0},{"sectionNumber":"AD/B747/170 Amdt 1","sectionType":"part","heading":"AD/B747/170 Amdt 1","content":"## AD/B747/170 Amdt 1","sortOrder":1},{"sectionNumber":"Main Entry Door Girt Bar Support Fitting","sectionType":"part","heading":"Main Entry Door Girt Bar Support Fitting","content":"## Main Entry Door Girt Bar Support Fitting","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","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":4,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the original focus on corrosion by also addressing reports that square and conical washers may have been installed incorrectly on girt bar support fittings after earlier repairs or replacements. The instrument therefore increases the range of required inspections/rectifications for the listed aircraft by adopting FAA AD 2007-12-11 and specified Boeing service bulletins (effective 2 August 2007)."},"complexity_factors":["Cross-references to external normative documents (FAA AD 2007-12-11 and Boeing service bulletins) requiring users to obtain and follow separate technical material.","Applicability spans multiple 747 variants (models listed) and a defined line-number range (1–868), requiring fleet-tailored compliance tracking.","Technical inspection and repair work (corrosion remediation; correct washer installation) demands specialised maintenance skills and parts.","Amendment 1 modifies original directive scope to add checks for incorrect washer installation after prior repairs, increasing follow-up work.","Regulatory enforcement depends on CASA adopting and fixing the effective date, creating a clear compliance deadline (2 August 2007)."],"plain_english_summary":"This airworthiness directive requires operators of Boeing 747 series aircraft (line numbers 1–868) to follow FAA AD 2007-12-11 and related Boeing service bulletins to inspect and repair main entry door girt bar support fittings, effective 2 August 2007. It addresses corrosion found on escape-slide supports and a report that square and conical washers may have been installed incorrectly. Operators are responsible for carrying out inspections and repairs; CASA enforces compliance by adopting the FAA requirements."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose: ensuring the airworthiness of main entry door escape slide fittings on specific Boeing 747 aircraft. The amendment adds a specific technical correction (washer installation issue) but does not expand beyond the original safety concern regarding girt bar support fittings."},"complexity_factors":["Short, single-purpose directive with one primary requirement","Only 2 defined technical references (FAA AD 2007-12-11 and Boeing Service Bulletins 747-53A2378)","No nested exceptions or conditional logic — applies to a clearly defined list of aircraft models","Cross-references to external technical documents rather than internal legislative provisions","Straightforward applicability table with specific model numbers and line numbers"],"plain_english_summary":"This AD mandates inspection and repair of the girt bar support fittings on main entry doors of older Boeing 747s (line numbers 1–868) to address corrosion in the floor structure and incorrect washer installations that could allow an escape slide to detach during evacuation. It affects operators of 747-100/200/300/400/747SR/747SP series aircraft and requires compliance with the referenced FAA AD and Boeing service bulletins by the effective date (2 August 2007)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting","history":"/api/acts/ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting/history","analysis":"/api/acts/ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting/analysis","conflicts":"/api/acts/ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting/conflicts","importantCases":"/api/acts/ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting/important-cases","documents":"/api/acts/ad-b747-170-amdt-1-main-entry-door-girt-bar-support-fitting/documents"}}