{"id":"F2006B03067","name":"AD/B747/165 - Elevator Control System Modifications","slug":"ad-b747-165-elevator-control-system-modifications","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42426,"registerId":"commonwealth-F2006B03067-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/165 - Elevator Control System Modifications","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/B747/165 Elevator Control System Modifications 2/97\n\nApplicability: Model 747-200, -300 and -400 series aeroplanes, having cumulative line number (C/L) 696 through 1057 inclusive and equipped with Parker inboard elevator power control packages (PCP) having Part Number (P/N) 93600-5005 through -5051 inclusive, or P/Ns 327400-1001, \\-1003, 1005 and 1007; certificated in any category.\n\nRequirement: 1. For Model 747-400 series aeroplanes, as listed in Boeing Alert Service Bulletin 747-27A2348, Revision 1, dated January 26, 1995, modify the hydraulic tubing of the right inboard elevator PCP in accordance with Boeing Alert Service Bulletin 747-27A2348, Revision 1, dated January 26, 1995.\n\n2. For all applicable aeroplanes, modify the left and right servo assemblies of the inboard elevator PCP, in accordance with Parker Service Bulletin 327400-27-171, Revision 1, dated April 14, 1995, or Parker Service Bulletin 93600-27-173 dated May 17, 1995 as applicable.\n\nNote: FAA AD 96-22-01 amendment 39-9790 refers.\n\nCompliance: 1. Within 12 months of the effective date of this directive.\n\n2. Within three years of the effective date of this directive.\n\nThis airworthiness directive becomes effective on 30 January 1997.\n\nBackground: The FAA has received a report of an uncommanded right elevator deflection after takeoff and reports of elevator/control column 'bumps' during the landing gear retraction cycle of these aeroplanes. The actions introduced by this Directive are intended to prevent uncommanded elevator deflection which could result in structural damage and reduced controllability of the aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The directive applies only to the listed Boeing 747 variants, cumulative line numbers and specified Parker PCP part numbers. The text sets targeted mechanical modifications to address reported uncommanded elevator behaviour; it does not indicate any expansion or narrowing of that applicability beyond what is stated."},"complexity_factors":["Technical engineering work required: hydraulic tubing modification and servo-assembly work on flight-control hydraulic components.","Multiple affected model types and a narrow cumulative line-number range (C/L 696–1057), requiring careful fleet screening.","Applicability tied to specific Parker PCP part-number ranges, increasing parts-identification and inventory checks.","Two different manufacturer service bulletins (Boeing and Parker), with specific revisions and dates to follow.","Staggered compliance times (12 months for the tubing mod on 747-400s; 3 years for servo mods), complicating maintenance planning.","Operational impacts: aircraft downtime, labour and parts costs borne by operators, potential scheduling and availability constraints.","Regulatory cross-reference to FAA AD 96-22-01 creates dependence on foreign airworthiness directives for technical justification.","Compliance monitoring and record-keeping obligations for operators and maintenance organisations to demonstrate AD completion."],"plain_english_summary":"Requires specific mechanical changes to inboard elevator power-control packages on certain Boeing 747-200, -300 and -400 series aeroplanes: a hydraulic-tubing modification on right inboard elevator PCPs for listed 747-400s, and servo-assembly modifications to left and right inboard elevator PCPs on all applicable aeroplanes. The directive aims to prevent uncommanded elevator deflections that could cause structural damage or reduced controllability. It affects operators and maintenance organisations of the specified aircraft, who must schedule and pay for the mandated work within set deadlines."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft configurations. The scope remains tightly constrained to elevator control system modifications for the identified Boeing 747 variants. No evidence of scope creep from original purpose."},"complexity_factors":["Highly specific applicability criteria requiring cross-referencing of model numbers, cumulative line numbers (C/L 696–1057), and multiple part numbers (P/N ranges)","Two-tier compliance structure with different deadlines (12 months vs 3 years) depending on aircraft model and modification type","References to external technical documents (Boeing Alert Service Bulletin 747-27A2348 and Parker Service Bulletins) that are not reproduced in the directive itself","Conditional logic: different requirements apply to 747-400 series versus other applicable models","Cross-reference to US FAA AD 96-22-01, creating potential jurisdictional complexity for operators","Dense technical terminology (servo assemblies, power control packages, hydraulic tubing) assumes aviation engineering knowledge"],"plain_english_summary":"This CASA Airworthiness Directive mandates safety fixes for certain Boeing 747-200/-300/-400 aircraft equipped with Parker elevator power‑control packages. It requires replacement/modification of right‑side hydraulic tubing on 747‑400s within 12 months and modification of servo assemblies on both sides for all affected models within 3 years.\n\nThe AD responds to incidents of uncommanded and jolting elevator movements that could impair control or damage structure; noncompliance prohibits flying these aircraft in Australian airspace."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-165-elevator-control-system-modifications","history":"/api/acts/ad-b747-165-elevator-control-system-modifications/history","analysis":"/api/acts/ad-b747-165-elevator-control-system-modifications/analysis","conflicts":"/api/acts/ad-b747-165-elevator-control-system-modifications/conflicts","importantCases":"/api/acts/ad-b747-165-elevator-control-system-modifications/important-cases","documents":"/api/acts/ad-b747-165-elevator-control-system-modifications/documents"}}