{"id":"F2006B03318","name":"AD/B767/141 Amdt 1 - Reduced Acceleration and Climb Performance","slug":"ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42755,"registerId":"commonwealth-F2006B03318-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/141 Amdt 1 - Reduced Acceleration and Climb Performance","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)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B767/141 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBoeing 767 Series Aeroplanes\n\nAD/B767/141\n\nAmdt1\n\n  \nReduced Acceleration and Climb Performance 8/2001\n\nDM\n\nApplicability: Boeing Model 767-200, 767-300 series aeroplanes equipped with Pratt & Whitney Model PW 4000 series engines.\n\nRequirement: Revise the Aircraft Flight Manual (AFM) by inserting a copy of FAA Airworthiness Directive (AD) 2001-01-10 with Boeing Telex M-7200-00-02672, dated 1 November 2000, including the performance adjustments in “Performance for Operations of PW4000 Series Engines with FB2B or FB2T Fans Installed, 767-200/767-300”.\n\nWhen the information in Boeing Telex M-7200-00-02672 and its attachments have been incorporated as a general revision of the AFM, the FAA AD and the telex and its attachments are to be removed from the AFM.\n\nNote: FAA AD 2001-01-10 Amendment 39-12080 refers.\n\nCompliance: Unless accomplished earlier, within 30 days from the effective date of this Directive.\n\nThis Amendment becomes effective on 12 July 2001.\n\nBackground: This Directive is being issued to correct the condition of Fan Thrust Deterioration Mode (FTDM) present on some PW4000 series engines fitted with early production fan blades. The thrust deterioration is due to erosion of fan blade’s leading edge and results in reduced acceleration and climb performance, relative to performance data in the AFM. The reduced thrust may result in runway overruns or impact with an obstacle or terrain.\n\nThis amendment is being issued to correct the FAA AD referred.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 21 June 2001\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 27 June 2001.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment revokes and replaces the earlier AD for the same aircraft/engine combination but does not broaden the class of affected aircraft or add new types of obligations beyond inserting FAA/Boeing documents into the AFM and using the adjusted performance data. Mechanically, it aligns CASA requirements with the FAA AD and a Boeing telex; it does not expand the AD's original safety focus or create lasting new regulatory powers. (See Opening text; Applicability; Requirement.)"},"complexity_factors":["Single main operative requirement: insert FAA AD and Boeing telex into the AFM","Limited applicability: only Boeing 767-200/300 with Pratt & Whitney PW4000 engines","Short compliance window specified (30 days)","Cross-references to two external documents (FAA AD 2001-01-10 and Boeing Telex M-7200-00-02672) but no detailed technical amendment text embedded","No layered exceptions or multiple conditional branches","Background explanation provided but no additional procedural or enforcement complexity"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- This Airworthiness Directive (AD) requires operators of certain Boeing 767 aeroplanes to update their Aircraft Flight Manual (AFM). (Requirement)\n- Specifically, the AFM must include a copy of FAA AD 2001-01-10 together with Boeing Telex M-7200-00-02672 and the telex's attached performance adjustments for PW4000 engines fitted with FB2B or FB2T fans. (Requirement)\n- The insertion must be completed within 30 days of the AD taking effect. Once the FAA AD and telex material have been incorporated into the AFM as a formal, general revision, the inserted FAA AD and telex can be removed. (Requirement, Compliance)\n\n**Who is affected**\n\n- Aircraft operators and owners of Boeing Model 767-200 and 767-300 aeroplanes that are fitted with Pratt & Whitney PW4000-series engines. (Applicability)\n- Flight crews and flight operations planners, because they must use the revised AFM performance data when planning takeoffs, climbs and other performance-critical phases. (Requirement)\n- Maintenance/continuing airworthiness staff and paperwork administrators responsible for keeping AFMs current. (Requirement)\n\n**Why it matters (stated purpose and immediate safety effect)**\n\n- The Directive responds to a condition called Fan Thrust Deterioration Mode (FTDM) affecting some PW4000 engines with early-production fan blades. FTDM is caused by erosion of the fan blade leading edge and reduces engine thrust. Reduced thrust can lower acceleration and climb performance compared to the AFM numbers and, according to the AD, may increase the risk of runway overruns or collision with obstacles or terrain. (Background)\n- The AD's immediate, mechanical fix is to make the AFM show adjusted, lower performance figures and associated procedures so flight crews plan with conservative (reduced) performance data. (Requirement)\n\n**Costs, incentives and trade-offs (practical effects and implementation issues)**\n\n- Who pays: aircraft operators bear the direct compliance cost — inserting the FAA AD and telex into the AFM, updating flight operations materials, and running any briefings or procedural changes for crews. (Requirement)\n- Behavioural effect: pilots and dispatchers must use the adjusted performance data when calculating takeoff and climb performance; this may change operational choices such as weight limits, runway selection, flap settings or required runway length. The AD text requires performance adjustments to be used but does not itself mandate hardware modification of engines. (Requirement, Background)\n- Regulatory coordination: the AD enforces FAA material and a Boeing telex within Australian-registered aircraft, so CASA is delegating the technical detail to those documents while retaining enforcement through the AD. The AD is explicit that the FAA AD and telex are to be removed from the AFM once the information is incorporated as a general AFM revision. (Requirement)\n- Trade-offs and opportunity costs: the AD prioritises immediate operational safety by lowering available performance figures; the trade-off is potential loss of payload, increased operational costs or routing changes for affected flights (these consequences follow from lower performance figures in the AFM but are not numerically specified in the AD). (Requirement, Background)\n- Implementation risk and compliance burden: the required action is administrative (document insertion) and training/briefing; the AD does not require inspections, parts replacement or grounding in this text, so the short-term burden is primarily paperwork, planning adjustments and crew training. If operators deem a hardware fix necessary, that would be separate from this AD. (Requirement, Background)\n\n**Distributional effects and market impact**\n\n- The obligation falls only on operators of 767-200/300s with PW4000 engines. This concentrates costs on a subset of operators rather than across the whole fleet. (Applicability)\n- Because this AD changes operational performance assumptions, affected operators may face higher per-flight costs (reduced payload or altered routings), which could be passed on to customers or absorbed by the operator depending on commercial position; the AD does not address compensation or economic relief. (Requirement, Background)\n\n**Authority and time limit**\n\n- CASA issued this AD under its airworthiness powers and set a 30-day compliance window from the effective date. The AD also revokes the prior AD it replaces. (Opening text, Compliance)\n\n(References: Applicability; Requirement; Compliance; Background.)"},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive, maintaining the same scope (addressing fan thrust deterioration in specific engines). The amendment simply corrects the reference to the FAA AD without expanding the scope beyond the original safety concern."},"complexity_factors":["Single, specific technical requirement (manual revision)","Clear applicability criteria (Boeing 767-200/300 with PW4000 engines)","Simple compliance deadline (30 days)","Minimal cross-referencing (one FAA AD and one Boeing telex)","No nested exceptions or conditional logic","Short document (1 page)","Straightforward background explanation"],"plain_english_summary":"This is a safety order for specific Boeing 767 aircraft. It requires airlines to update their flight manuals with new performance data for certain Pratt & Whitney engines that have a known problem with fan blade erosion. This erosion causes engines to produce less thrust than expected during takeoff and climb, which could lead to dangerous situations like running out of runway or hitting obstacles. Airlines must make this change within 30 days of the directive taking effect. Once the flight manual is properly updated through a general revision, the temporary paperwork can be removed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance","history":"/api/acts/ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance/history","analysis":"/api/acts/ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance/analysis","conflicts":"/api/acts/ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance/conflicts","importantCases":"/api/acts/ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance/important-cases","documents":"/api/acts/ad-b767-141-amdt-1-reduced-acceleration-and-climb-performance/documents"}}