{"id":"F2006B03313","name":"AD/B767/131 Amdt 2 - Canted Pressure Deck Drain System","slug":"ad-b767-131-amdt-2-canted-pressure-deck-drain-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42750,"registerId":"commonwealth-F2006B03313-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/131 Amdt 2 - Canted Pressure Deck Drain System","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B767/131 Amdt 1. and issues the following AD under subregulation 39.1 (1) of CASR 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\n![](image.001.png)  \n\nBoeing 767 Series Aeroplanes\n\nAD/B767/131\n\nAmdt 2\n\n  \nCanted Pressure Deck Drain System 10/2003\n\nDM\n\nApplicability: Model 767 series aircraft, line numbers 1 through 723.\n\nRequirement: Modify in accordance with the technical requirements of FAA AD 2000-22-11 Amdt 39-11957. The modification may be accomplished in accordance with Revision 1, 2 or 3 of Boeing SB 767-51A0020.\n\nNote: No re-work is required for aircraft that have been modified in accordance with the initial issue, Revision 1 or Revision 2 of the Service Bulletin.\n\nCompliance: Within 36 months after 25 January 2001.\n\nThe Compliance time remains unchanged by this issue. This Amendment becomes effective on 6 August 2003.\n\nBackground: The FAA received reports of ice accumulation on the aileron control cables and on the main landing gear door and door seal during flight, due to fluid entering the canted pressure deck area, leaking into the main landing gear wheel well and freezing. This Directive requires certain actions to prevent such ice accumulation, which could render one of the aileron control systems and/or main landing gear doors inoperative, resulting in reduced controllability of the aircraft.\n\nAmendment 1 was issued to introduce a note that later approved revisions of the Service Bulletins are available, which will satisfy the technical requirements of FAA AD 2000-22-11.\n\nAmendment 2 is issued because FAA AD 2000-22-11 Amdt 39-11957 only allows the use of SB 767-51A0020 Revision 1 to accomplish the modification. Since the FAA AD’s release, later revisions of the referenced Service Bulletin have been released by Boeing and the FAA AD has not been amended to reflect this. This Amendment allows the use of the later revisions of the Service Bulletin to accomplish the modification whilst still satisfying the requirements of the FAA Airworthiness Directive.\n\nAmendment 1 of this Airworthiness Directive became effective on 7 August 2003.\n\nBoeing 767 Series Aeroplanes\n\nAD/B767/131 Amdt 2 (continued)\n\nThe original issue of this Airworthiness Directive became effective on 25 January 2001.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 28 July 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 6 August 2003.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Amendment 2 maintains the original scope of the directive — fixing the canted pressure deck drain system on Boeing 767s. It merely expands the permitted methods of compliance to include later revisions of the Boeing Service Bulletin, without broadening the safety issue addressed or the aircraft affected."},"complexity_factors":["Short, single-purpose instrument (approximately 1 page)","Only 4 structural sections: Applicability, Requirement, Compliance, Background","Minimal defined terms (only 'line numbers' requires industry knowledge)","Single cross-reference to foreign regulation (FAA AD 2000-22-11)","Simple conditional logic: if already modified per earlier revisions, no re-work required","Narrow, technical scope affecting only specific aircraft model series"],"plain_english_summary":"This AD mandates owners/operators of Boeing 767s (line numbers 1–723) to modify the canted pressure deck drain system because fluid leaks were freezing in flight and impairing aileron control cables and main landing gear doors. Compliance must follow FAA AD 2000-22-11 using Boeing Service Bulletin 767-51A0020 (Revision 1, 2, or 3) within 36 months of 25 January 2001. It affects Australian operators of the specified 767s."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 2 does not expand the AD's substantive scope (the affected fleet, the unsafe condition addressed, and the compliance deadline remain unchanged). It only relaxes a procedural constraint by permitting later revisions (Revisions 1–3) of Boeing Service Bulletin 767-51A0020 to be used to accomplish the required modification while still meeting the FAA AD technical requirements. This is a technical permissive change rather than a change in the AD's safety objective or coverage."},"complexity_factors":["Short, single-airworthiness-issue directive focused on one retrofit","One clear applicability clause: Model 767, line numbers 1–723","Cross-reference to external FAA AD (FAA AD 2000-22-11 Amdt 39-11957)","Cross-reference to an external supplier document: Boeing SB 767-51A0020 (Revisions 1, 2 or 3)","A single compliance deadline (36 months after 25 January 2001) — no staged or conditional timings","One short exception/note: no re-work required for aircraft already modified under earlier SB issues","Limited conditionality — no nested exceptions, no alternative methods of compliance specified in the AD"],"plain_english_summary":"**What this instrument does (mechanics)\n\n- Applies to: Boeing 767 series aeroplanes, line numbers 1 through 723. (Applicability)\n- Requires: modification of the \"canted pressure deck drain system\" to the technical standard set out in FAA Airworthiness Directive (FAA AD) 2000-22-11 Amdt 39-11957. The work may be done using Boeing Service Bulletin (SB) 767-51A0020 Revision 1, 2 or 3. (Requirement)\n- Timing: the modification had to be carried out within 36 months after 25 January 2001. The compliance time is unchanged by this Amendment. (Compliance)\n- Effective administrative detail: CASA revoked the earlier AD/B767/131 Amdt 1 and issued this Amendment 2 to permit later revisions of the Boeing Service Bulletin while still meeting the FAA AD requirements. (Amendment text)\n\n**Who is directly affected\n\n- Aircraft operators and owners of Boeing 767s with line numbers 1–723. They must arrange and pay for the modification and any associated aircraft downtime. (Applicability, Requirement)\n- Maintenance organisations and Boeing (as supplier of the Service Bulletin) — they perform the work and supply parts and instructions.\n- CASA and the FAA exercise oversight: the FAA AD sets the technical requirement and CASA enforces compliance for Australian-registered aircraft. (Requirement, Background)\n\n**Why the change was made (stated safety concern)\n\n- Background reports show fluid entering the canted pressure deck area, leaking into the main landing gear wheel well and freezing. Ice built up on aileron control cables and on main landing gear doors/seals in flight. That ice accumulation could disable an aileron control system and/or landing gear doors, reducing aircraft controllability. The modification is required to prevent that failure mode. (Background)\n\n**What this Amendment 2 specifically does relative to earlier versions\n\n- The original AD required the modification per the FAA AD and referenced a particular revision of Boeing SB 767-51A0020. Amendment 2 allows operators to accomplish the modification using later approved revisions of that Boeing Service Bulletin (Revisions 1, 2 or 3), so work done to those later revisions still satisfies the FAA AD technical requirements. The substantive safety requirement, the affected fleet, and the compliance deadline were not changed by this Amendment. (Requirement, Note, Background)\n\n**Practical effects, incentives and costs (brief analysis)\n\n- Who pays: aircraft operators bear direct costs for parts, labour, and aircraft out-of-service time. (Requirement, Compliance)\n- Who decides technical detail: the FAA AD specifies the technical goal; Boeing provides the Service Bulletin revisions that implement the fix; CASA enforces compliance for Australian aircraft and explicitly permits the later SB revisions. (Requirement, Background)\n- Implementation burden: the work is a retrofit/modification that must be performed by approved maintenance organisations. It may require scheduling, parts procurement, and non-revenue flying time. (Requirement)\n- Market effects: maintenance providers and Boeing capture the concentrated revenue for performing/modifying aircraft under the SB. Operators face a diffuse cost spread across the fleet. (Requirement)\n- Alternatives and discretion: the AD requires compliance with the FAA AD and referenced SB revisions; it does not in this text describe alternate methods of compliance. That concentrates the technical route through the FAA/SB methodology unless a separate FAA/CASA-approved alternative method is sought. (Requirement, Note)\n- Risks and trade-offs: allowing later SB revisions reduces administrative friction for operators who apply newer Boeing-approved procedures, but operators still must budget for the modification and manage aircraft downtime. There is some reliance on coordination between Boeing, the FAA and CASA for consistent technical acceptance. (Amendment text, Requirement)\n\n**Where to look in the AD for specifics\n\n- Applicability: which aircraft are covered. (Applicability)\n- Requirement: the precise instruction to modify per the FAA AD and the acceptable SB revisions. (Requirement)\n- Compliance: the deadline for carrying out the work. (Compliance)\n- Background: the safety incident reports and the reason for the AD. (Background)\n\n(Section citations in parentheses refer to the labelled parts of the Airworthiness Directive provided.)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-131-amdt-2-canted-pressure-deck-drain-system","history":"/api/acts/ad-b767-131-amdt-2-canted-pressure-deck-drain-system/history","analysis":"/api/acts/ad-b767-131-amdt-2-canted-pressure-deck-drain-system/analysis","conflicts":"/api/acts/ad-b767-131-amdt-2-canted-pressure-deck-drain-system/conflicts","importantCases":"/api/acts/ad-b767-131-amdt-2-canted-pressure-deck-drain-system/important-cases","documents":"/api/acts/ad-b767-131-amdt-2-canted-pressure-deck-drain-system/documents"}}