{"id":"F2006B03014","name":"AD/B747/112 - Main Entry Door Guide Arm","slug":"ad-b747-112-main-entry-door-guide-arm","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42373,"registerId":"commonwealth-F2006B03014-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/112 - Main Entry Door Guide Arm","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 747 Series Aeroplanes\n\n \n\nAD/B747/112 Main Entry Door Guide Arm 7/92\n\nApplicability: Model 747 series, as listed in Boeing ASB 747-52A2237. Requirement:  Action in accordance with Boeing ASB 747-52A2237.\n\nNote: FAA AD 92-06-07 Amdt 39-8187 refers.\n\n \n\nCompliance: Prior to 25 August 1992.\n\n \n\nBackground: The FAA received a report of migrating guide arm assembly bearings which may have resulted from insufficient bearing retention during production rework. The actions specified by this Directive are intended to prevent an inoperable emergency door power assist system and/or the inability to operate the door, which is required for emergency evacuation. The effective date required by the FAA is extended by approximately two months.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection/repair of door guide arm bearings."},"complexity_factors":["Very short document — approximately 150 words of substantive content","Only 1 defined reference (Boeing ASB 747-52A2237) which is an external technical document","Single, unambiguous compliance requirement: follow the Boeing service bulletin","No nested conditions, exceptions, or alternative compliance paths","No cross-references to other legislation beyond a note about the corresponding FAA directive","Straightforward applicability clause referencing a specific aircraft model list"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 747 aircraft.\n\n**What it does:** It requires airlines and aircraft operators to inspect and fix a problem with the **main entry door guide arm** on certain Boeing 747 models. The guide arm is a mechanical component that helps the aircraft door move smoothly. The issue involves **bearing retention** — basically, small parts inside the door mechanism that weren't secured properly during manufacturing, which could cause them to shift or \"migrate\" out of place.\n\n**Why it matters:** If this problem isn't fixed:\n- The **emergency door power assist system** (the mechanism that helps crew open heavy doors quickly during an emergency) might fail\n- The door might become **impossible to operate** when passengers need to evacuate\n\n**Who must comply:** Operators of Boeing 747 series aircraft listed in Boeing Alert Service Bulletin 747-52A2237.\n\n**Deadline:** The work had to be completed before 25 August 1992 (this AD is historical — it applied to maintenance schedules over 30 years ago)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No substantive change to the technical scope: the AD requires the same corrective actions and applicability as referenced in Boeing ASB 747-52A2237 and the FAA AD. The only material change reported in the text is an extension of the FAA’s effective date by approximately two months and the specific CASA compliance deadline (prior to 25 August 1992)."},"complexity_factors":["Directs compliance by reference to an external Boeing Alert Service Bulletin (747-52A2237), requiring operators to obtain and follow that document","Safety-critical focus (emergency exit power‑assist and door operability) increases operational urgency","Firm compliance deadline (prior to 25 August 1992) creates scheduling and logistical demands","Narrow applicability (specific 747 series) requires fleet applicability checks","Cross-reference to FAA AD increases regulatory tracing for international operators","The AD itself contains little technical detail, shifting technical burden to the service bulletin"],"plain_english_summary":"This airworthiness directive requires operators of certain Boeing 747 models to carry out the corrective work specified in Boeing Alert Service Bulletin 747-52A2237 to address migrating guide‑arm bearings on the main entry door. CASA mandates completion of the work by 25 August 1992 and affected operators (airlines/owners) must pay to perform the actions. The stated purpose is to prevent loss of the emergency‑door power assist or inability to open the door for evacuation; the AD also extends the FAA’s originally required effective date by about two months."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-112-main-entry-door-guide-arm","history":"/api/acts/ad-b747-112-main-entry-door-guide-arm/history","analysis":"/api/acts/ad-b747-112-main-entry-door-guide-arm/analysis","conflicts":"/api/acts/ad-b747-112-main-entry-door-guide-arm/conflicts","importantCases":"/api/acts/ad-b747-112-main-entry-door-guide-arm/important-cases","documents":"/api/acts/ad-b747-112-main-entry-door-guide-arm/documents"}}