{"id":"F2006L02237","name":"AD/B747/347 - Horizontal Stabilizer Drive Mechanism","slug":"ad-b747-347-horizontal-stabilizer-drive-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117563,"registerId":"commonwealth-F2006L02237-current","compilationNumber":null,"startDate":"2026-04-03","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/B747/347 | Horizontal Stabilizer Drive Mechanism | 8/2006 |\n| ----------- | ------------------------------------- | ------ |\n\n| Applicability: | Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series aeroplanes.                                                                                                                                                                                                                                                                                                                                    |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with FAA AD 2006-10-02 with a revised effective date of3 August 2006.Note: FAA AD 2006-10-02 Amdt 39-14586 dated 28 April 2006 refers.                                                                                                                                                                                                                                                                                                                               |\n| Compliance:    | As detailed in FAA AD 2006-10-02.                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 3 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Background:    | This AD results from a report of extensive corrosion of a ballscrew in the drive mechanism of the horizontal stabilizer on a similar aeroplane model. The actions detailed in this AD are intended to prevent an undetected failure of the primary load path for the ballscrew in the horizontal stabilizer and subsequent wear and failure of the secondary load path, which could lead to loss of control of the horizontal stabilizer and consequent loss of control of the aeroplane. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n20 June 2006","sortOrder":0},{"sectionNumber":"AD/B747/347","sectionType":"part","heading":"AD/B747/347","content":"## AD/B747/347","sortOrder":1},{"sectionNumber":"Horizontal Stabilizer Drive Mechanism","sectionType":"part","heading":"Horizontal Stabilizer Drive Mechanism","content":"## Horizontal Stabilizer Drive Mechanism","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","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":false,"description":"This AD adopts the requirements of FAA AD 2006-10-02 for the specified Boeing 747 models and sets an Australian effective date (3 August 2006). The instrument does not broaden applicability or add new technical requirements beyond the referenced FAA AD (Requirement; Compliance; Applicability)."},"complexity_factors":["Cross-reference dependency: the AD requires operators to follow FAA AD 2006-10-02 rather than containing procedures itself (Requirement; Compliance)","Applicability spans many Boeing 747 variants, increasing fleet-level administrative coordination (Applicability)","Issue is safety-critical (ballscrew corrosion risks primary load path failure), requiring technical inspections and possible parts/repairs (Background)","Legal force and effective date are specified but substantive inspection schedules/details reside in the referenced FAA AD (Compliance)","Operational impacts: inspections/repairs can cause downtime and direct maintenance costs for operators (Compliance; Background)","Delegated issuance through CASA adds administrative authority but does not add procedural detail (Delegate of the Civil Aviation Safety Authority)"],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Boeing 747 models to follow the inspections and corrective actions set out in FAA AD 2006-10-02 (revised effective 3 August 2006). It targets corrosion and wear in the horizontal stabilizer ballscrew drive mechanism to prevent failure of the primary load path and possible loss of stabilizer control (Background; Requirement).\n\nOperators bear the compliance obligations and costs because the AD adopts the FAA instructions rather than prescribing new procedures domestically (Requirement; Compliance). CASA issued the directive effective 3 August 2006 (Delegate signature)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing the ballscrew corrosion issue in 747 horizontal stabilizers."},"complexity_factors":["Extremely short document (under 300 words)","No defined terms section — relies entirely on external FAA document","Single operative requirement: 'do what the FAA says'","No conditional logic, exceptions, or nested provisions","Simple applicability table listing aircraft models","No cross-references to other Australian legislation"],"plain_english_summary":"This mandatory Airworthiness Directive requires operators of specified Boeing 747 series to inspect and remediate corrosion in the horizontal stabilizer ballscrew, a failure of which could lead to loss of pitch control. Australia is adopting FAA AD 2006-10-02 by reference, so affected 747s operating under Australian registration or in Australian airspace must comply. This is a safety-critical fix to prevent catastrophic control failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-347-horizontal-stabilizer-drive-mechanism","history":"/api/acts/ad-b747-347-horizontal-stabilizer-drive-mechanism/history","analysis":"/api/acts/ad-b747-347-horizontal-stabilizer-drive-mechanism/analysis","conflicts":"/api/acts/ad-b747-347-horizontal-stabilizer-drive-mechanism/conflicts","importantCases":"/api/acts/ad-b747-347-horizontal-stabilizer-drive-mechanism/important-cases","documents":"/api/acts/ad-b747-347-horizontal-stabilizer-drive-mechanism/documents"}}